Remove recursion when stringifying std::tuple

The matcher combinators do not take ownership of the matchers
being combined, which can catch the users off-guard, when code like
this

```cpp
using Catch::Matchers::EndsWith;
using Catch::Matchers::ContainsSubstring;

auto combinedMatcher = EndsWith("as a service")
                       && ContainsSubstring("web scale");

REQUIRE_THAT( getSomeString(), combinedMatcher );
```

leads to use-after-free, as the `combinedMatcher` refers to matcher
temporaries that no longer exists. With this commit, users of Clang,
MSVC or other compiler that understands the `lifetimebound` attribute,
should get a warning.

.bazelrc

@@ -1,10 +1,8 @@
-# Enable Bzlmod for every Bazel command
-common --enable_bzlmod
-
 build --enable_platform_specific_config
 
 build:gcc9 --cxxopt=-std=c++2a
 build:gcc11 --cxxopt=-std=c++2a
+build:gcc13 --cxxopt=-std=c++2a
 build:clang13 --cxxopt=-std=c++17
 build:vs2019 --cxxopt=/std:c++17
 build:vs2022 --cxxopt=/std:c++17

.clang-tidy

@@ -78,5 +78,5 @@ WarningsAsErrors: >-
   readability-duplicate-include,
 HeaderFilterRegex: '.*\.(c|cxx|cpp)$'
 FormatStyle:     none
-CheckOptions: {}
+CheckOptions: []
 ...

.github/workflows/linux-other-builds.yml

@@ -79,8 +79,6 @@ jobs:
         sudo apt-get install -y ninja-build ${{matrix.other_pkgs}}
 
     - name: Configure build
-      # Note: $GITHUB_WORKSPACE is distinct from ${{runner.workspace}}.
-      #       This is important
       run: |
         cmake --preset basic-tests -GNinja \
               -DCMAKE_BUILD_TYPE=${{matrix.build_type}} \
@@ -106,8 +104,6 @@ jobs:
         sudo apt-get install -y ninja-build clang-15 clang-tidy-15
 
     - name: Configure
-      # Note: $GITHUB_WORKSPACE is distinct from ${{runner.workspace}}.
-      #       This is important
       run: |
         clangtidy="clang-tidy-15;-use-color"
         # Use a dummy compiler/linker/ar/ranlib to effectively disable the

.github/workflows/linux-simple-builds.yml

@@ -10,8 +10,6 @@ jobs:
       fail-fast: false
       matrix:
         cxx:
-          - g++-7
-          - g++-8
           - g++-9
           - g++-10
           - g++-11
@@ -28,10 +26,6 @@ jobs:
         build_type: [Debug, Release]
         std: [14]
         include:
-          - cxx: g++-7
-            other_pkgs: g++-7
-          - cxx: g++-8
-            other_pkgs: g++-8
           - cxx: g++-9
             other_pkgs: g++-9
           - cxx: g++-10
@@ -98,8 +92,6 @@ jobs:
         sudo apt-get install -y ninja-build ${{matrix.other_pkgs}}
 
     - name: Configure
-      # Note: $GITHUB_WORKSPACE is distinct from ${{runner.workspace}}.
-      #       This is important
       run: |
         cmake --preset basic-tests -GNinja \
               -DCMAKE_BUILD_TYPE=${{matrix.build_type}} \

.github/workflows/windows-simple-builds.yml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [windows-2019, windows-2022, windows-2025]
+        os: [windows-2022, windows-2025]
         platform: [Win32, x64]
         build_type: [Debug, Release]
         std: [14, 17]

BUILD.bazel

@@ -1,4 +1,20 @@
 load("@bazel_skylib//rules:expand_template.bzl", "expand_template")
+load("@rules_cc//cc:cc_library.bzl", "cc_library")
+load("@rules_license//rules:license.bzl", "license")
+
+package(
+    default_applicable_licenses = [":license"],
+)
+
+exports_files([
+    "LICENSE.MIT",
+])
+
+license(
+    name = "license",
+    license_kinds = ["@rules_license//licenses/spdx:BSL-1.0"],
+    license_text = "LICENSE.MIT",
+)
 
 expand_template(
     name = "catch_user_config",
@@ -16,6 +32,7 @@ expand_template(
         "#cmakedefine CATCH_CONFIG_CPP17_STRING_VIEW": "",
         "#cmakedefine CATCH_CONFIG_CPP17_UNCAUGHT_EXCEPTIONS": "",
         "#cmakedefine CATCH_CONFIG_CPP17_VARIANT": "",
+        "#cmakedefine CATCH_CONFIG_DEPRECATION_ANNOTATIONS": "",
         "#cmakedefine CATCH_CONFIG_DISABLE_EXCEPTIONS_CUSTOM_HANDLER": "",
         "#cmakedefine CATCH_CONFIG_DISABLE_EXCEPTIONS": "",
         "#cmakedefine CATCH_CONFIG_DISABLE_STRINGIFICATION": "",
@@ -39,6 +56,7 @@ expand_template(
         "#cmakedefine CATCH_CONFIG_NO_CPP17_STRING_VIEW": "",
         "#cmakedefine CATCH_CONFIG_NO_CPP17_UNCAUGHT_EXCEPTIONS": "",
         "#cmakedefine CATCH_CONFIG_NO_CPP17_VARIANT": "",
+        "#cmakedefine CATCH_CONFIG_NO_DEPRECATION_ANNOTATIONS": "",
         "#cmakedefine CATCH_CONFIG_NO_GETENV": "",
         "#cmakedefine CATCH_CONFIG_NO_GLOBAL_NEXTAFTER": "",
         "#cmakedefine CATCH_CONFIG_NO_POSIX_SIGNALS": "",
@@ -58,6 +76,8 @@ expand_template(
         "#cmakedefine CATCH_CONFIG_WINDOWS_SEH": "",
         "#cmakedefine CATCH_CONFIG_USE_BUILTIN_CONSTANT_P": "",
         "#cmakedefine CATCH_CONFIG_NO_USE_BUILTIN_CONSTANT_P": "",
+        "#cmakedefine CATCH_CONFIG_EXPERIMENTAL_THREAD_SAFE_ASSERTIONS": "",
+        "#cmakedefine CATCH_CONFIG_NO_EXPERIMENTAL_THREAD_SAFE_ASSERTIONS": "",
     },
     template = "src/catch2/catch_user_config.hpp.in",
 )

CMake/CatchConfigOptions.cmake

@@ -44,6 +44,8 @@ set(_OverridableOptions
   "GETENV"
   "EXPERIMENTAL_STATIC_ANALYSIS_SUPPORT"
   "USE_BUILTIN_CONSTANT_P"
+  "DEPRECATION_ANNOTATIONS"
+  "EXPERIMENTAL_THREAD_SAFE_ASSERTIONS"
 )
 
 foreach(OptionName ${_OverridableOptions})

CMake/catch2-with-main.pc.in

@@ -1,10 +1,10 @@
-includedir=@CMAKE_INSTALL_FULL_INCLUDEDIR@
-libdir=@CMAKE_INSTALL_FULL_LIBDIR@
+prefix=@CMAKE_INSTALL_PREFIX@
+libdir=${prefix}/@lib_dir@
 pkg_version=@Catch2_VERSION@
 
-Name: Catch2-With-Main
+Name: Catch2 with main function
 Description: A modern, C++-native test framework for C++14 and above (links in default main)
+URL: https://github.com/catchorg/Catch2
 Version: ${pkg_version}
 Requires: catch2 = ${pkg_version}
-Cflags: -I${includedir}
-Libs: -L${libdir} -lCatch2Main
+Libs: -L${libdir} -l@lib_name@

CMake/catch2.pc.in

@@ -1,11 +1,11 @@
 prefix=@CMAKE_INSTALL_PREFIX@
 exec_prefix=${prefix}
-includedir=@CMAKE_INSTALL_FULL_INCLUDEDIR@
-libdir=@CMAKE_INSTALL_FULL_LIBDIR@
+includedir=${prefix}/@include_dir@
+libdir=${prefix}/@lib_dir@
 
 Name: Catch2
 Description: A modern, C++-native, test framework for C++14 and above
 URL: https://github.com/catchorg/Catch2
 Version: @Catch2_VERSION@
 Cflags: -I${includedir}
-Libs: -L${libdir} -lCatch2
+Libs: -L${libdir} -l@lib_name@

CMakeLists.txt

@@ -20,6 +20,7 @@ cmake_dependent_option(CATCH_BUILD_TESTING "Build the SelfTest project" ON "CATC
 cmake_dependent_option(CATCH_BUILD_EXAMPLES "Build code examples" OFF "CATCH_DEVELOPMENT_BUILD" OFF)
 cmake_dependent_option(CATCH_BUILD_EXTRA_TESTS "Build extra tests" OFF "CATCH_DEVELOPMENT_BUILD" OFF)
 cmake_dependent_option(CATCH_BUILD_FUZZERS "Build fuzzers" OFF "CATCH_DEVELOPMENT_BUILD" OFF)
+cmake_dependent_option(CATCH_BUILD_BENCHMARKS "Build the benchmarks" OFF "CATCH_DEVELOPMENT_BUILD" OFF)
 cmake_dependent_option(CATCH_ENABLE_COVERAGE "Generate coverage for codecov.io" OFF "CATCH_DEVELOPMENT_BUILD" OFF)
 cmake_dependent_option(CATCH_ENABLE_WERROR "Enables Werror during build" ON "CATCH_DEVELOPMENT_BUILD" OFF)
 cmake_dependent_option(CATCH_BUILD_SURROGATES "Enable generating and building surrogate TUs for the main headers" OFF "CATCH_DEVELOPMENT_BUILD" OFF)
@@ -34,7 +35,7 @@ if(CMAKE_BINARY_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
 endif()
 
 project(Catch2
-  VERSION 3.8.1 # CML version placeholder, don't delete
+  VERSION 3.11.0 # CML version placeholder, don't delete
   LANGUAGES CXX
   HOMEPAGE_URL "https://github.com/catchorg/Catch2"
   DESCRIPTION "A modern, C++-native, unit test framework."
@@ -77,10 +78,15 @@ set(SELF_TEST_DIR ${CATCH_DIR}/tests/SelfTest)
 # We need to bring-in the variables defined there to this scope
 add_subdirectory(src)
 
+if (CATCH_BUILD_BENCHMARKS)
+  set(CMAKE_FOLDER "benchmarks")
+  add_subdirectory(benchmarks)
+endif()
+
 # Build tests only if requested
 if(BUILD_TESTING AND CATCH_BUILD_TESTING AND NOT_SUBPROJECT)
-  find_package(PythonInterp 3 REQUIRED)
-  if(NOT PYTHONINTERP_FOUND)
+  find_package(Python3 REQUIRED COMPONENTS Interpreter)
+  if(NOT TARGET Python3::Interpreter)
     message(FATAL_ERROR "Python not found, but required for tests")
   endif()
   set(CMAKE_FOLDER "tests")
@@ -103,7 +109,13 @@ if(CATCH_BUILD_FUZZERS)
 endif()
 
 if(CATCH_DEVELOPMENT_BUILD)
-  add_warnings_to_targets("${CATCH_WARNING_TARGETS}")
+  set(CATCH_ALL_TARGETS ${CATCH_IMPL_TARGETS} ${CATCH_TEST_TARGETS})
+  add_warnings_to_targets("${CATCH_ALL_TARGETS}")
+  # After we added the noreturn hint to FAIL and SKIP, Clang became
+  # extremely good at diagnosing tests that test these macros as being
+  # noreturn, but not marked as such. This made the warning useless for
+  # our test files.
+  add_cxx_flag_if_supported_to_targets("-Wno-missing-noreturn" "${CATCH_TEST_TARGETS}")
 endif()
 
 # Only perform the installation steps when Catch is not being used as
@@ -170,23 +182,47 @@ if(NOT_SUBPROJECT)
     "${CMAKE_INSTALL_DATAROOTDIR}/pkgconfig"
     CACHE PATH "Path where catch2.pc is installed"
   )
-  configure_file(
-    ${CMAKE_CURRENT_SOURCE_DIR}/CMake/catch2.pc.in
-    ${CMAKE_CURRENT_BINARY_DIR}/catch2.pc
-    @ONLY
-  )
-  configure_file(
-    ${CMAKE_CURRENT_SOURCE_DIR}/CMake/catch2-with-main.pc.in
-    ${CMAKE_CURRENT_BINARY_DIR}/catch2-with-main.pc
-    @ONLY
-  )
-  install(
-    FILES
-      "${CMAKE_CURRENT_BINARY_DIR}/catch2.pc"
-      "${CMAKE_CURRENT_BINARY_DIR}/catch2-with-main.pc"
-    DESTINATION
-      ${PKGCONFIG_INSTALL_DIR}
+
+  # Generate the pkg-config files
+  # To understand the script below, you have to understand that it works in two steps.
+  # 1) A CMake script is generated at configuration time
+  # 2) It is executed at install time.
+  # And both of these have access to different parts of the information we need.
+  #
+  # Further, the variables before "[[" are expanded at configuration time,
+  # while the ones inside the [[]] block are expanded at script execution (install) time.
+  string(
+    JOIN "\n"
+      install_script
+       "set(install_pkgconfdir \"${PKGCONFIG_INSTALL_DIR}\")"
+       "set(impl_pc_file \"${CMAKE_CURRENT_SOURCE_DIR}/CMake/catch2.pc.in\")"
+       "set(main_pc_file \"${CMAKE_CURRENT_SOURCE_DIR}/CMake/catch2-with-main.pc.in\")"
+       "set(Catch2_VERSION ${Catch2_VERSION})"
+       "set(include_dir \"${CMAKE_INSTALL_INCLUDEDIR}\")"
+       "set(lib_dir \"${CMAKE_INSTALL_LIBDIR}\")"
+       [[
+         message(STATUS "DESTDIR: $ENV{DESTDIR}")
+         set(DESTDIR_PREFIX "")
+         if (DEFINED ENV{DESTDIR})
+           set(DESTDIR_PREFIX "$ENV{DESTDIR}")
+         endif ()
+         message(STATUS "PREFIX: ${DESTDIR_PREFIX}")
+         set(lib_name "$<TARGET_FILE_BASE_NAME:Catch2>")
+         configure_file(
+           "${impl_pc_file}"
+           "${DESTDIR_PREFIX}${CMAKE_INSTALL_PREFIX}/${install_pkgconfdir}/catch2.pc"
+           @ONLY
+         )
+
+         set(lib_name "$<TARGET_FILE_BASE_NAME:Catch2WithMain>")
+         configure_file(
+           "${main_pc_file}"
+           "${DESTDIR_PREFIX}${CMAKE_INSTALL_PREFIX}/${install_pkgconfdir}/catch2-with-main.pc"
+           @ONLY
+         )
+       ]]
   )
+  install(CODE "${install_script}")
 
   set(CPACK_PACKAGE_CONTACT "https://github.com/catchorg/Catch2/")
 

CMakePresets.json

@@ -15,14 +15,23 @@
             }
         },
         {
-            "name": "all-tests",
+            "name": "most-tests",
             "inherits": "basic-tests",
             "displayName": "Full development build",
-            "description": "Enables development build with examples and ALL tests",
+            "description": "Enables development build with extended set of tests (still relatively cheap to build)",
             "cacheVariables": {
                 "CATCH_BUILD_EXAMPLES": "ON",
                 "CATCH_BUILD_EXTRA_TESTS": "ON",
                 "CATCH_BUILD_SURROGATES": "ON",
+                "CATCH_BUILD_BENCHMARKS": "ON"
+            }
+        },
+        {
+            "name": "all-tests",
+            "inherits": "most-tests",
+            "displayName": "Full development build",
+            "description": "Enables development build with examples and ALL tests",
+            "cacheVariables": {
                 "CATCH_ENABLE_CONFIGURE_TESTS": "ON",
                 "CATCH_ENABLE_CMAKE_HELPER_TESTS": "ON"
             }

MODULE.bazel

@@ -1,4 +1,5 @@
 module(name = "catch2")
 
 bazel_dep(name = "bazel_skylib", version = "1.7.1")
-bazel_dep(name = "rules_cc", version = "0.0.17")
+bazel_dep(name = "rules_cc", version = "0.1.1")
+bazel_dep(name = "rules_license", version = "1.0.0")

README.md

@@ -1,5 +1,16 @@
 <a id="top"></a>
-![Catch2 logo](data/artwork/catch2-logo-small-with-background.png)
+
+<table width="100%">
+  <tr>
+    <td align="center" width="50%"><img src="/data/artwork/catch2-logo-full-with-background.svg" width="100%"></td>
+    <td align="center" width="50%">
+      <figure>
+        <figcaption>Special thanks to:</figcaption>
+        <a href="https://tuple.app/catch2"><img src="/data/sponsors/github_repo_sponsorship.png" width="100%"></a>
+      </figure>
+    </td>
+  </tr>
+</table>
 
 [![Github Releases](https://img.shields.io/github/release/catchorg/catch2.svg)](https://github.com/catchorg/catch2/releases)
 [![Linux build status](https://github.com/catchorg/Catch2/actions/workflows/linux-simple-builds.yml/badge.svg)](https://github.com/catchorg/Catch2/actions/workflows/linux-simple-builds.yml)

benchmarks/CMakeLists.txt

@@ -0,0 +1,16 @@
+include(CatchMiscFunctions)
+
+add_executable(AssertionsFastPath
+  runtime_assertion_benches.cpp
+)
+
+add_executable(AssertionsSlowPath
+  runtime_assertion_benches.cpp
+  assertion_listener.cpp
+)
+
+target_link_libraries(AssertionsFastPath PRIVATE Catch2::Catch2WithMain)
+target_link_libraries(AssertionsSlowPath PRIVATE Catch2::Catch2WithMain)
+
+list(APPEND CATCH_TEST_TARGETS AssertionsFastPath AssertionsSlowPath)
+set(CATCH_TEST_TARGETS ${CATCH_TEST_TARGETS} PARENT_SCOPE)

benchmarks/assertion_listener.cpp

@@ -0,0 +1,28 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
+#include <catch2/reporters/catch_reporter_event_listener.hpp>
+#include <catch2/reporters/catch_reporter_registrars.hpp>
+
+/**
+ * Event listener that listens to all assertions, forcing assertion slow path
+ */
+class AssertionSlowPathListener : public Catch::EventListenerBase {
+public:
+    static std::string getDescription() {
+        return "Validates ordering of Catch2's listener events";
+    }
+
+    AssertionSlowPathListener(Catch::IConfig const* config) :
+        EventListenerBase(config) {
+        m_preferences.shouldReportAllAssertions = true;
+        m_preferences.shouldReportAllAssertionStarts = true;
+    }
+};
+
+CATCH_REGISTER_LISTENER( AssertionSlowPathListener )

benchmarks/runtime_assertion_benches.cpp

@@ -0,0 +1,27 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
+#include <catch2/catch_test_macros.hpp>
+
+TEST_CASE("Simple REQUIRE - 10M") {
+    for (size_t i = 0; i < 10'000'000; ++i) {
+        REQUIRE(true);
+    }
+}
+
+TEST_CASE("Simple NOTHROW - 10M") {
+    for (size_t i = 0; i < 10'000'000; ++i) {
+        REQUIRE_NOTHROW([](){}());
+    }
+}
+
+TEST_CASE("Simple THROWS - 10M") {
+    for (size_t i = 0; i < 10'000'000; ++i) {
+        REQUIRE_THROWS([]() { throw 1; }());
+    }
+}

data/artwork/catch2-c-logo.svg

@@ -0,0 +1,105 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   width="104.41245mm"
+   height="120.99883mm"
+   viewBox="0 0 101.59999 117.7396"
+   version="1.1"
+   id="svg1"
+   inkscape:version="1.4-beta (62f545ba5e, 2024-04-22)"
+   sodipodi:docname="catch2-c-logo.svg"
+   xml:space="preserve"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg"><sodipodi:namedview
+     id="namedview1"
+     pagecolor="#ffffff"
+     bordercolor="#000000"
+     borderopacity="0.25"
+     inkscape:showpageshadow="2"
+     inkscape:pageopacity="0.0"
+     inkscape:pagecheckerboard="0"
+     inkscape:deskcolor="#d1d1d1"
+     inkscape:document-units="mm"
+     inkscape:zoom="2"
+     inkscape:cx="181"
+     inkscape:cy="192.25"
+     inkscape:window-width="2560"
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+     inkscape:window-maximized="1"
+     inkscape:current-layer="svg1"
+     inkscape:clip-to-page="false" /><defs
+     id="defs1"><inkscape:path-effect
+       effect="bspline"
+       id="path-effect21"
+       is_visible="true"
+       lpeversion="1.3"
+       weight="33.333333"
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+       apply_with_weight="true"
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+       lpeversion="1.2"
+       lpesatellites=""
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+       discard_orig_path="false"
+       fuse_paths="true"
+       oposite_fuse="false"
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docs/Readme.md

@@ -32,6 +32,7 @@ Once you're up and running consider the following reference material.
 * [CMake integration](cmake-integration.md#top)
 * [Tooling integration (CI, test runners, other)](ci-and-misc.md#top)
 * [Known limitations](limitations.md#top)
+* [Thread safety in Catch2](thread-safety.md#top)
 
 **Other:**
 * [Why Catch2?](why-catch.md#top)

docs/ci-and-misc.md

@@ -66,17 +66,24 @@ test execution. Specifically it understands
  * JUnit output path via `XML_OUTPUT_FILE`
  * Test filtering via `TESTBRIDGE_TEST_ONLY`
  * Test sharding via `TEST_SHARD_INDEX`, `TEST_TOTAL_SHARDS`, and `TEST_SHARD_STATUS_FILE`
+ * Creating a file to signal premature test exit via `TEST_PREMATURE_EXIT_FILE`
+ * Setting the RNG seed via `TEST_RANDOM_SEED`
 
 > Support for `XML_OUTPUT_FILE` was [introduced](https://github.com/catchorg/Catch2/pull/2399) in Catch2 3.0.1
 
 > Support for `TESTBRIDGE_TEST_ONLY` and sharding was introduced in Catch2 3.2.0
 
+> Support for `TEST_PREMATURE_EXIT_FILE` and `TEST_RANDOM_SEED` was introduced in Catch2 3.11.0
+
 This integration is enabled via either a [compile time configuration
 option](configuration.md#bazel-support), or via `BAZEL_TEST` environment
 variable set to "1".
 
 > Support for `BAZEL_TEST` was [introduced](https://github.com/catchorg/Catch2/pull/2459) in Catch2 3.1.0
 
+Note that if both the Bazel environment var and command line option for
+something are used, the environment variable wins.
+
 
 ## Low-level tools
 

docs/cmake-integration.md

@@ -52,7 +52,7 @@ Include(FetchContent)
 FetchContent_Declare(
   Catch2
   GIT_REPOSITORY https://github.com/catchorg/Catch2.git
-  GIT_TAG        v3.4.0 # or a later release
+  GIT_TAG        v3.8.1 # or a later release
 )
 
 FetchContent_MakeAvailable(Catch2)

docs/command-line.md

@@ -32,6 +32,7 @@
 [Test Sharding](#test-sharding)<br>
 [Allow running the binary without tests](#allow-running-the-binary-without-tests)<br>
 [Output verbosity](#output-verbosity)<br>
+[Create file to guard against silent early termination](#create-file-to-guard-against-silent-early-termination)<br>
 
 Catch works quite nicely without any command line options at all - but for those times when you want greater control the following options are available.
 Click one of the following links to take you straight to that option - or scroll on to browse the available options.
@@ -398,18 +399,24 @@ use test specs to filter this list down to what you want first.
 Test cases are ordered one of three ways:
 
 ### decl
-Declaration order (this is the default order if no --order argument is provided).
+Declaration order.
+
 Tests in the same translation unit are sorted using their declaration orders,
 different TUs are sorted in an implementation (linking) dependent order.
 
 
 ### lex
-Lexicographic order. Tests are sorted by their name, their tags are ignored.
+Lexicographic order.
+
+Tests are sorted by their name, their tags are ignored.
 
 
 ### rand
+Randomized order. The default order.
 
-Randomly ordered. The order is dependent on Catch2's random seed (see
+> Randomized order has been made default in Catch2 3.9.0
+
+The order is dependent on Catch2's random seed (see
 [`--rng-seed`](#rng-seed)), and is subset invariant. What this means
 is that as long as the random seed is fixed, running only some tests
 (e.g. via tag) does not change their relative order.
@@ -643,6 +650,21 @@ ignored.
 Verbosity defaults to _normal_.
 
 
+## Create file to guard against silent early termination
+<pre>--premature-exit-guard-file &lt;path&gt;</pre>
+
+> Introduced in Catch2 3.11.0
+
+Tells Catch2 to create an empty file at specified path before the tests
+start, and delete it after the tests finish. If the file is present after
+the process stops, it can be assumed that the testing binary exited
+prematurely, e.g. due to the OOM killer.
+
+All directories in the path must already exist. If this option is used
+and Catch2 cannot create the file (e.g. the location is not writable),
+the test run will fail.
+
+
 ---
 
 [Home](Readme.md#top)

docs/configuration.md

@@ -14,8 +14,10 @@
 [Other toggles](#other-toggles)<br>
 [Enabling stringification](#enabling-stringification)<br>
 [Disabling exceptions](#disabling-exceptions)<br>
+[Disabling deprecation warnings](#disabling-deprecation-warnings)<br>
 [Overriding Catch's debug break (`-b`)](#overriding-catchs-debug-break--b)<br>
 [Static analysis support](#static-analysis-support)<br>
+[Experimental thread safety](#experimental-thread-safety)<br>
 
 Catch2 is designed to "just work" as much as possible, and most of the
 configuration options below are changed automatically during compilation,
@@ -164,7 +166,7 @@ by using `_NO_` in the macro, e.g. `CATCH_CONFIG_NO_CPP17_UNCAUGHT_EXCEPTIONS`.
 
 > `CATCH_CONFIG_GETENV` was [introduced](https://github.com/catchorg/Catch2/pull/2562) in Catch2 3.2.0
 
-> `CATCH_CONFIG_USE_BUILTIN_CONSTANT_P` was introduced in Catch2 vX.Y.Z
+> `CATCH_CONFIG_USE_BUILTIN_CONSTANT_P` was introduced in Catch2 3.8.0
 
 Currently Catch enables `CATCH_CONFIG_WINDOWS_SEH` only when compiled with MSVC, because some versions of MinGW do not have the necessary Win32 API support.
 
@@ -263,6 +265,21 @@ namespace Catch {
 }
 ```
 
+
+## Disabling deprecation warnings
+
+> Introduced in Catch2 3.9.0
+
+Catch2 has started using the C++ macro `[[deprecated]]` to mark things
+that are deprecated and should not be used any more. If you need to
+temporarily disable these warnings, use
+
+    CATCH_CONFIG_NO_DEPRECATION_ANNOTATIONS
+
+Catch2 currently does not support more fine-grained deprecation warning
+control, nor do we plan to.
+
+
 ## Overriding Catch's debug break (`-b`)
 
 > [Introduced](https://github.com/catchorg/Catch2/pull/1846) in Catch2 2.11.2.
@@ -299,6 +316,21 @@ no backwards compatibility guarantees._
 are not meant to be runnable, only "scannable".
 
 
+## Experimental thread safety
+
+> Introduced in Catch2 3.9.0
+
+Catch2 can optionally support thread-safe assertions, that means, multiple
+user-spawned threads can use the assertion macros at the same time. Due
+to the performance cost this imposes even on single-threaded usage, Catch2
+defaults to non-thread-safe assertions.
+
+    CATCH_CONFIG_EXPERIMENTAL_THREAD_SAFE_ASSERTIONS     // enables thread safe assertions
+    CATCH_CONFIG_NO_EXPERIMENTAL_THREAD_SAFE_ASSERTIONS  // force-disables thread safe assertions
+
+See [the documentation on thread safety in Catch2](thread-safety.md#top)
+for details on which macros are safe and other notes.
+
 
 ---
 

docs/deprecations.md

@@ -38,7 +38,7 @@ macro](skipping-passing-failing.md#top).
 
 ### Non-const function for `TEST_CASE_METHOD`
 
-> Deprecated in Catch2 vX.Y.Z
+> Deprecated in Catch2 3.7.0
 
 Currently, the member function generated for `TEST_CASE_METHOD` is
 not `const` qualified. In the future, the generated member function will

docs/generators.md

@@ -114,11 +114,12 @@ a test case,
   * `MapGenerator<T, U, Func>` -- returns the result of applying `Func`
   on elements from a different generator
   * `ChunkGenerator<T>` -- returns chunks (inside `std::vector`) of n elements from a generator
-* 4 specific purpose generators (defined in `catch2/generators/catch_generators_random.hpp`)
+* 2 random generators (defined in `catch2/generators/catch_generators_random.hpp`)
   * `RandomIntegerGenerator<Integral>` -- generates random Integrals from range
   * `RandomFloatGenerator<Float>` -- generates random Floats from range
-  * `RangeGenerator<T>(first, last)` -- generates all values inside a `[first, last)` arithmetic range (defined in `catch2/generators/catch_generators_range.hpp`)
-  * `IteratorGenerator<T>` -- copies and returns values from an iterator range (defined in `catch2/generators/catch_generators_range.hpp`)
+* 2 range generators (defined in `catch2/generators/catch_generators_range.hpp`)
+  * `RangeGenerator<T>(first, last)` -- generates all values inside a `[first, last)` arithmetic range
+  * `IteratorGenerator<T>` -- copies and returns values from an iterator range
 
 > `ChunkGenerator<T>`, `RandomIntegerGenerator<Integral>`, `RandomFloatGenerator<Float>` and `RangeGenerator<T>` were introduced in Catch2 2.7.0.
 

docs/limitations.md

@@ -57,40 +57,6 @@ again.
 ## Features
 This section outlines some missing features, what is their status and their possible workarounds.
 
-### Thread safe assertions
-Catch2's assertion macros are not thread safe. This does not mean that
-you cannot use threads inside Catch's test, but that only single thread
-can interact with Catch's assertions and other macros.
-
-This means that this is ok
-```cpp
-    std::vector<std::thread> threads;
-    std::atomic<int> cnt{ 0 };
-    for (int i = 0; i < 4; ++i) {
-        threads.emplace_back([&]() {
-            ++cnt; ++cnt; ++cnt; ++cnt;
-        });
-    }
-    for (auto& t : threads) { t.join(); }
-    REQUIRE(cnt == 16);
-```
-because only one thread passes the `REQUIRE` macro and this is not
-```cpp
-    std::vector<std::thread> threads;
-    std::atomic<int> cnt{ 0 };
-    for (int i = 0; i < 4; ++i) {
-        threads.emplace_back([&]() {
-            ++cnt; ++cnt; ++cnt; ++cnt;
-            CHECK(cnt == 16);
-        });
-    }
-    for (auto& t : threads) { t.join(); }
-    REQUIRE(cnt == 16);
-```
-
-We currently do not plan to support thread-safe assertions.
-
-
 ### Process isolation in a test
 Catch does not support running tests in isolated (forked) processes. While this might in the future, the fact that Windows does not support forking and only allows full-on process creation and the desire to keep code as similar as possible across platforms, mean that this is likely to take significant development time, that is not currently available.
 
@@ -187,5 +153,5 @@ but only when compiled with a C++20 conforming compiler. MSVC is currently
 not conformant enough, but `clang-cl` will compile the assertion above
 using MSVC STL without problem.
 
-This change got in with MSVC v19.37](https://godbolt.org/z/KG9obzdvE).
+[This change got in with MSVC v19.37](https://godbolt.org/z/KG9obzdvE).
 

docs/logging.md

@@ -1,32 +1,30 @@
 <a id="top"></a>
 # Logging macros
 
-Additional messages can be logged during a test case. Note that the messages logged with `INFO` are scoped and thus will not be reported if failure occurs in scope preceding the message declaration. An example:
+Catch2 provides various macros for logging extra information when
+running a test. These macros default to being scoped, and associate with
+all assertions in the scope, regardless of whether they pass or fail.
 
+**example**
 ```cpp
-TEST_CASE("Foo") {
+TEST_CASE("Simple info") {
     INFO("Test case start");
-    for (int i = 0; i < 2; ++i) {
-        INFO("The number is " << i);
-        CHECK(i == 0);
+    SECTION("A") {
+        INFO("Section A");
+        CHECK(false);        // 1
     }
+    SECTION("B") {
+        INFO("Section B");
+        CHECK(false);        // 2
+    }
+    CHECK(false);            // 3
 }
+```
+The first assertion will report messages "Test case start", and "Section A"
+as extra information. The second one will report messages "Test case
+started" and "Section B", while the third one will only report "Test case
+started" as the extra info.
 
-TEST_CASE("Bar") {
-    INFO("Test case start");
-    for (int i = 0; i < 2; ++i) {
-        INFO("The number is " << i);
-        CHECK(i == i);
-    }
-    CHECK(false);
-}
-```
-When the `CHECK` fails in the "Foo" test case, then two messages will be printed.
-```
-Test case start
-The number is 1
-```
-When the last `CHECK` fails in the "Bar" test case, then only one message will be printed: `Test case start`.
 
 ## Logging without local scope
 

docs/own-main.md

@@ -57,17 +57,18 @@ int main( int argc, char* argv[] ) {
 
   int returnCode = session.applyCommandLine( argc, argv );
   if( returnCode != 0 ) // Indicates a command line error
-        return returnCode;
+    return returnCode;
 
   // writing to session.configData() or session.Config() here
   // overrides command line args
   // only do this if you know you need to
 
-  int numFailed = session.run();
+  returnCode = session.run();
+
+  // returnCode encodes the type of error that occured. See the
+  // integer constants in catch_session.hpp for more information
+  // on what each return code means.
 
-  // numFailed is clamped to 255 as some unices only use the lower 8 bits.
-  // This clamping has already been applied, so just return it here
-  // You can also do any post run clean-up here
   return numFailed;
 }
 ```

docs/release-notes.md

@@ -2,6 +2,10 @@
 
 # Release notes
 **Contents**<br>
+[3.11.0](#3110)<br>
+[3.10.0](#3100)<br>
+[3.9.1](#391)<br>
+[3.9.0](#390)<br>
 [3.8.1](#381)<br>
 [3.8.0](#380)<br>
 [3.7.1](#371)<br>
@@ -67,6 +71,93 @@
 [Even Older versions](#even-older-versions)<br>
 
 
+## 3.11.0
+
+### Fixes
+* Fixed building on non-desktop GDK platforms (#3029)
+* Fixed message macros being susceptible to race in specific scenario (#3031)
+* Catch2's SEH filter will call the previously installed filter after reporting the error (#3033)
+
+### Improvements
+* Handling of scoped messages (e.g. `CAPTURE`) is a bit faster.
+* Better out-of-the-box support for QNX (#2953)
+* Improved performance of assertions by up-to 10%
+  * Release mode assertion fast-path sees the biggest improvement.
+* Faster processing of non-escaped strings in `--invisibles` mode.
+* Added support for Bazel's `TEST_RANDOM_SEED` env var (#3021)
+* Added support for Bazel's `TEST_PREMATURE_EXIT_FILE` env var (#3020)
+  * This creates a file that is deleted if the tests exit normally, but stays around if the process dies unexpectedly.
+  * This functionality is also exposed through CLI as `--premature-exit-guard-file`
+
+### Miscellaneous
+* **[Tuple.app](https://tuple.app/catch2) has sponsored Catch2**
+
+
+## 3.10.0
+
+### Fixes
+* pkg-config files will take `DESTDIR` env var into account when selecting install destination (#3006, #3019)
+* Changed `filter` to store the provided predicate by value (#3002, #3005)
+  * This is done to avoid dangling-by-default behaviour when `filter` is used inside `GENERATE_COPY`/`GENERATE_REF`.
+
+### Improvements
+* Escaping XML and JSON output is faster when the strings do not need escaping.
+  * The improvement starts at about 3x throughput, up to 10x for long strings.
+* Message macros (`INFO`, `CAPTURE`, `WARN`, `SUCCEED`, etc) are now thread safe.
+
+
+## 3.9.1
+
+### Fixes
+* Fixed bad error reporting for multiple nested assertions (#1292)
+* Fixed W4702 (unreachable code) in the polyfill for std::unreachable (#3007)
+* Fixed decomposition of assertions comparing enum-backed bitfields (#3001)
+* Fixed StringMaker specialization for `time_point<system_clock>` with non-default duration type (#2685)
+
+### Improvements
+* Exceptions thrown during stringification of decomposed expression no longer fail the assertion (#2980)
+* The selection logic for `CATCH_TRAP` prefers `__builtin_debugtrap` on all platforms when Catch2 is compiled with Clang
+
+
+## 3.9.0
+
+### Improvements
+* **Added experimental opt-in support for thread safe assertions**
+  * Read the documentation for full details
+* **The default test run order has been changed to random**
+* Passing assertions are significantly faster when the reporter does not ask for `assertionEnded` events on passing assertions.
+  * This is the default behaviour of e.g. Console or Compact reporter
+  * Simple `REQUIRE(true)` is 60% faster in Release and 80% faster in Debug build configuration
+  * Simple `REQUIRE_NOTHROW` is 230% faster in Release and 430% faster in Debug build configuration
+  * Simple `REQUIRE_THROWS` is ~3% faster in Release and 20% faster in Debug build configuration (throwing introduces enough overhead that the optimizations inside Catch2 are mostly irrelevant)
+* Small (2-5%) improvement if the reporter asks for `assertionEnded` events for passing assertions.
+* The exit code constants are part of the Session API. (#2955, #2976)
+* Suppressed unsigned integer overflow checking in locations with intended overflow (#2965)
+* Reporters flush output after writing metadata, e.g. rng seed (#2964)
+* Added unreachable after `FAIL` and `SKIP` macros (#2941)
+  * This allows the compiler to understand that the execution does not continue past the macro, and avoids warnings.
+* Added fast path for `assertionStarting` event when no reporter requires it
+  * For backwards compatibility, this fast path is opt-in
+  * A reporter can opt in by changing its `ReporterPreferences::shouldReportAllAssertionStarts`
+* Improved last seen source location tracking to be more precise
+  * This is used when reporting unexpected exceptions from tests
+
+### Fixes
+* Fixed formatting of tags with more than 100 tests in the default `--list-tags` output (#2963)
+* Fixed Clang-Tidy's `readability-static-accessed-through-instance` in tests
+* Fixed most of Clang-Tidy's `cppcoreguidelines-avoid-non-const-global-variables` (#2582)
+* The lifetime of scoped messages now strictly obeys their scope (#1759, #2019, #2959)
+  * Previously Catch2 would try to keep them around during unexpected exception, to provide helpful context.
+  * The amount of surprises the irregularities caused was not worth the occasional utility provided.
+* `TEMPLATE_TEST_CASE_SIG` can handle signatures consisting of only types (#2680, #2995)
+* Moved `catch_test_run_info.hpp` up from `internal/` subfolder into the main one (#2972)
+
+### Miscellaneous
+* pkg-config files are now generated at install time (#2979)
+  * This fixes missing debug suffix in library names
+  * This fixes install prefix mismatch between build config and actuall installation
+
+
 ## 3.8.1
 
 ### Fixes

docs/reporters.md

@@ -154,7 +154,7 @@ and calls itself "partial" reporter, so it can be invoked with
 
 Each reporter instance contains instance of `ReporterPreferences`, a type
 that holds flags for the behaviour of Catch2 when this reporter run.
-Currently there are two customization options:
+Currently there are three customization options:
 
 * `shouldRedirectStdOut` - whether the reporter wants to handle
    writes to stdout/stderr from user code, or not. This is useful for
@@ -165,6 +165,11 @@ Currently there are two customization options:
    assertions. Usually reporters do not report successful assertions
    and don't need them for their output, but sometimes the desired output
    format includes passing assertions even without the `-s` flag.
+* `shouldReportAllAssertionStarts` - whether the reporter wants to handle
+  `assertionStarting` events. Most reporters do not, and opting out
+   explicitly enables a fast-path in Catch2's handling of assertions.
+
+> `shouldReportAllAssertionStarts` was introduced in Catch2 3.9.0
 
 
 ### Per-reporter configuration

docs/skipping-passing-failing.md

@@ -52,6 +52,20 @@ TEST_CASE("failing test") {
 }
 ```
 
+Same applies for a `SKIP` nested inside an assertion:
+
+```cpp
+static bool do_skip() {
+    SKIP();
+    return true;
+}
+
+TEST_CASE("Another failing test") {
+    CHECK(do_skip());
+}
+```
+
+
 ### Interaction with Sections and Generators
 
 Sections, nested sections as well as specific outputs from [generators](generators.md#top)

docs/test-fixtures.md

@@ -4,7 +4,7 @@
 **Contents**<br>
 [Non-Templated test fixtures](#non-templated-test-fixtures)<br>
 [Templated test fixtures](#templated-test-fixtures)<br>
-[Signature-based parameterised test fixtures](#signature-based-parametrised-test-fixtures)<br>
+[Signature-based parameterised test fixtures](#signature-based-parameterised-test-fixtures)<br>
 [Template fixtures with types specified in template type lists](#template-fixtures-with-types-specified-in-template-type-lists)<br>
 
 ## Non-Templated test fixtures

docs/thread-safety.md

@@ -0,0 +1,229 @@
+<a id="top"></a>
+# Thread safety in Catch2
+
+**Contents**<br>
+[Using assertion macros from spawned threads](#using-assertion-macros-from-spawned-threads)<br>
+[Assertion-like message macros and spawned threads](#assertion-like-message-macros-and-spawned-threads)<br>
+[Message macros and spawned threads](#message-macros-and-spawned-threads)<br>
+[examples](#examples)<br>
+[`STATIC_REQUIRE` and `STATIC_CHECK`](#static_require-and-static_check)<br>
+[Fatal errors and multiple threads](#fatal-errors-and-multiple-threads)<br>
+[Performance overhead](#performance-overhead)<br>
+
+> Thread safe assertions were introduced in Catch2 3.9.0
+
+Thread safety in Catch2 is currently limited to all the assertion macros,
+and to message or message-adjacent macros (e.g. `INFO` or `WARN`).
+
+Interacting with benchmark macros, sections macros, generator macros, or
+test case macros is not thread-safe. The way sections define paths through
+the test is incompatible with user spawning threads arbitrarily, so this
+limitation is here to stay.
+
+**Important: thread safety in Catch2 is [opt-in](configuration.md#experimental-thread-safety)**
+
+
+## Using assertion macros from spawned threads
+
+The full set of Catch2's runtime assertion macros is thread-safe. However,
+it is important to keep in mind that their semantics might not support
+being used from user-spawned threads.
+
+Specifically, the `REQUIRE` family of assertion macros have semantics
+of stopping the test execution on failure. This is done by throwing
+an exception, but since the user-spawned thread will not have the test-level
+try-catch block ready to catch the test failure exception, failing a
+`REQUIRE` assertion inside user-spawned thread will terminate the process.
+
+The `CHECK` family of assertions does not have this issue, because it
+does not try to stop the test execution.
+
+Note that `CHECKED_IF` and `CHECKED_ELSE` are also thread safe (internally
+they are assertion macro + an if).
+
+
+## Assertion-like message macros and spawned threads
+
+> Assertion-like messages were made thread safe in Catch2 3.10.0
+
+Similarly to assertion macros, not all assertion-like message macros can
+be used from spawned thread.
+
+`SKIP` and `FAIL` macros stop the test execution. Just like with `REQUIRE`,
+this means that they cannot be used inside user-spawned threads. `SUCCEED`,
+`FAIL_CHECK` and `WARN` do not attempt to stop the test execution and
+thus can be used from any thread.
+
+
+## Message macros and spawned threads
+
+> Message macros were made thread safe in Catch2 3.10.0
+
+Macros that add extra messages to following assertion, such as `INFO`
+or `CAPTURE`, are all thread safe and can be used in any thread. Note
+that these messages are per-thread, and thus `INFO` inside a user-spawned
+thread will not be seen by the main thread, and vice versa.
+
+
+## examples
+
+### `REQUIRE` from the main thread, `CHECK` from spawned threads
+
+```cpp
+TEST_CASE( "Failed REQUIRE in the main thread is fine" ) {
+    std::vector<std::jthread> threads;
+    for ( size_t t = 0; t < 16; ++t) {
+        threads.emplace_back( []() {
+            for (size_t i = 0; i < 10'000; ++i) {
+                CHECK( true );
+                CHECK( false );
+            }
+        } );
+    }
+
+    REQUIRE( false );
+}
+```
+This will work as expected, that is, the process will finish running
+normally, the test case will fail and there will be the correct count of
+passing and failing assertions (160000 and 160001 respectively). However,
+it is important to understand that when the main thread fails its assertion,
+the spawned threads will keep running.
+
+
+### `REQUIRE` from spawned threads
+
+```cpp
+TEST_CASE( "Successful REQUIRE in spawned thread is fine" ) {
+    std::vector<std::jthread> threads;
+    for ( size_t t = 0; t < 16; ++t) {
+        threads.emplace_back( []() {
+            for (size_t i = 0; i < 10'000; ++i) {
+                REQUIRE( true );
+            }
+        } );
+    }
+}
+```
+This will also work as expected, because the `REQUIRE` is successful.
+
+```cpp
+TEST_CASE( "Failed REQUIRE in spawned thread kills the process" ) {
+    std::vector<std::jthread> threads;
+    for ( size_t t = 0; t < 16; ++t) {
+        threads.emplace_back( []() {
+            for (size_t i = 0; i < 10'000; ++i) {
+                REQUIRE( false );
+            }
+        } );
+    }
+}
+```
+This will fail catastrophically and terminate the process.
+
+
+### INFO across threads
+
+```cpp
+TEST_CASE( "messages don't cross threads" ) {
+    std::jthread t1( [&]() {
+        for ( size_t i = 0; i < 100; ++i ) {
+            INFO( "spawned thread #1" );
+            CHECK( 1 == 1 );
+        }
+    } );
+
+    std::thread t2( [&]() {
+        for (size_t i = 0; i < 100; ++i) {
+            UNSCOPED_INFO( "spawned thread #2" );
+        }
+    } );
+
+    for (size_t i = 0; i < 100; ++i) {
+        CHECK( 1 == 2 );
+    }
+}
+```
+None of the failed checks will show the "spawned thread #1" message, as
+that message is for the `t1` thread. If the reporter shows passing
+assertions (e.g. due to the tests being run with `-s`), you will see the
+"spawned thread #1" message alongside the passing `CHECK( 1 == 1 )` assertion.
+
+The message "spawned thread #2" will never be shown, because there are no
+assertions in `t2`.
+
+
+### FAIL/SKIP from the main thread
+
+```cpp
+TEST_CASE( "FAIL in the main thread is fine" ) {
+    std::vector<std::jthread> threads;
+    for ( size_t t = 0; t < 16; ++t) {
+        threads.emplace_back( []() {
+            for (size_t i = 0; i < 10; ++i) {
+                CHECK( true );
+                CHECK( false );
+            }
+        } );
+    }
+
+    FAIL();
+}
+```
+
+This will work as expected, that is, the process will finish running
+normally, the test case will fail and there will be 321 total assertions,
+160 passing and 161 failing (`FAIL` counts as failed assertion).
+
+However, when the main thread hits `FAIL`, it will wait for the other
+threads to finish due to `std::jthread`'s destructor joining the spawned
+thread. Due to this, using `SKIP` is not recommended once more threads
+are spawned; while the main thread will bail from the test execution,
+the spawned threads will keep running and may fail the test case.
+
+
+### FAIL/SKIP from spawned threads
+
+```cpp
+TEST_CASE( "FAIL/SKIP in spawned thread kills the process" ) {
+    std::vector<std::jthread> threads;
+    for ( size_t t = 0; t < 16; ++t) {
+        threads.emplace_back( []() {
+            for (size_t i = 0; i < 10'000; ++i) {
+                FAIL();
+            }
+        } );
+    }
+}
+```
+As with failing `REQUIRE`, both `FAIL` and `SKIP` in spawned threads
+terminate the process.
+
+
+## `STATIC_REQUIRE` and `STATIC_CHECK`
+
+All of `STATIC_REQUIRE`, `STATIC_REQUIRE_FALSE`, `STATIC_CHECK`, and
+`STATIC_CHECK_FALSE` are thread safe in the delayed evaluation configuration.
+
+
+## Fatal errors and multiple threads
+
+By default, Catch2 tries to catch fatal errors (POSIX signals/Windows
+Structured Exceptions) and report something useful to the user. This
+always happened on a best-effort basis, but in presence of multiple
+threads and locks the chance of it working decreases. If this starts
+being an issue for you, [you can disable it](configuration.md#other-toggles).
+
+
+## Performance overhead
+
+In the worst case, which is optimized build and assertions using the
+fast path for successful assertions, the performance overhead of using
+the thread-safe assertion implementation can reach 40%. In other cases,
+the overhead will be smaller, between 4% and 20%.
+
+
+
+---
+
+[Home](Readme.md#top)

examples/210-Evt-EventListeners.cpp

@@ -307,7 +307,7 @@ void print( std::ostream& os, int const level, std::string const& title, Catch::
 // 2. My listener and registration:
 //
 
-char const * dashed_line =
+char const * const dashed_line =
     "--------------------------------------------------------------------------";
 
 

examples/CMakeLists.txt

@@ -54,5 +54,5 @@ foreach(name ${ALL_EXAMPLE_TARGETS})
   target_link_libraries(${name} Catch2WithMain)
 endforeach()
 
-list(APPEND CATCH_WARNING_TARGETS ${ALL_EXAMPLE_TARGETS})
-set(CATCH_WARNING_TARGETS ${CATCH_WARNING_TARGETS} PARENT_SCOPE)
+list(APPEND CATCH_TEST_TARGETS ${ALL_EXAMPLE_TARGETS})
+set(CATCH_TEST_TARGETS ${CATCH_TEST_TARGETS} PARENT_SCOPE)

fuzzing/NullOStream.h

@@ -16,7 +16,7 @@ class NullStreambuf : public std::streambuf {
   char dummyBuffer[64];
 
 protected:
-  virtual int overflow(int c) override final;
+  virtual int overflow(int c) final;
 };
 
 class NullOStream final : private NullStreambuf, public std::ostream {

meson.build

@@ -8,7 +8,7 @@
 project(
   'catch2',
   'cpp',
-  version: '3.8.1', # CML version placeholder, don't delete
+  version: '3.11.0', # CML version placeholder, don't delete
   license: 'BSL-1.0',
   meson_version: '>=0.54.1',
 )

src/CMakeLists.txt

@@ -58,6 +58,7 @@ set(IMPL_HEADERS
   ${SOURCES_DIR}/catch_template_test_macros.hpp
   ${SOURCES_DIR}/catch_test_case_info.hpp
   ${SOURCES_DIR}/catch_test_macros.hpp
+  ${SOURCES_DIR}/catch_test_run_info.hpp
   ${SOURCES_DIR}/catch_test_spec.hpp
   ${SOURCES_DIR}/catch_timer.hpp
   ${SOURCES_DIR}/catch_tostring.hpp
@@ -84,6 +85,7 @@ set(IMPL_HEADERS
   ${SOURCES_DIR}/internal/catch_debug_console.hpp
   ${SOURCES_DIR}/internal/catch_debugger.hpp
   ${SOURCES_DIR}/internal/catch_decomposer.hpp
+  ${SOURCES_DIR}/internal/catch_deprecation_macro.hpp
   ${SOURCES_DIR}/internal/catch_enforce.hpp
   ${SOURCES_DIR}/internal/catch_enum_values_registry.hpp
   ${SOURCES_DIR}/internal/catch_errno_guard.hpp
@@ -96,6 +98,7 @@ set(IMPL_HEADERS
   ${SOURCES_DIR}/internal/catch_jsonwriter.hpp
   ${SOURCES_DIR}/internal/catch_lazy_expr.hpp
   ${SOURCES_DIR}/internal/catch_leak_detector.hpp
+  ${SOURCES_DIR}/internal/catch_lifetimebound.hpp
   ${SOURCES_DIR}/internal/catch_list.hpp
   ${SOURCES_DIR}/internal/catch_logical_traits.hpp
   ${SOURCES_DIR}/internal/catch_message_info.hpp
@@ -135,15 +138,16 @@ set(IMPL_HEADERS
   ${SOURCES_DIR}/internal/catch_test_failure_exception.hpp
   ${SOURCES_DIR}/internal/catch_test_macro_impl.hpp
   ${SOURCES_DIR}/internal/catch_test_registry.hpp
-  ${SOURCES_DIR}/internal/catch_test_run_info.hpp
   ${SOURCES_DIR}/internal/catch_test_spec_parser.hpp
   ${SOURCES_DIR}/internal/catch_textflow.hpp
+  ${SOURCES_DIR}/internal/catch_thread_support.hpp
   ${SOURCES_DIR}/internal/catch_to_string.hpp
   ${SOURCES_DIR}/internal/catch_uncaught_exceptions.hpp
   ${SOURCES_DIR}/internal/catch_uniform_floating_point_distribution.hpp
   ${SOURCES_DIR}/internal/catch_uniform_integer_distribution.hpp
   ${SOURCES_DIR}/internal/catch_unique_name.hpp
   ${SOURCES_DIR}/internal/catch_unique_ptr.hpp
+  ${SOURCES_DIR}/internal/catch_unreachable.hpp
   ${SOURCES_DIR}/internal/catch_void_type.hpp
   ${SOURCES_DIR}/internal/catch_wildcard_pattern.hpp
   ${SOURCES_DIR}/internal/catch_windows_h_proxy.hpp
@@ -450,8 +454,8 @@ if(CATCH_BUILD_EXAMPLES OR CATCH_BUILD_EXTRA_TESTS)
   target_compile_features(Catch2_buildall_interface INTERFACE cxx_std_14)
 endif()
 
-list(APPEND CATCH_WARNING_TARGETS Catch2 Catch2WithMain)
-set(CATCH_WARNING_TARGETS ${CATCH_WARNING_TARGETS} PARENT_SCOPE)
+list(APPEND CATCH_IMPL_TARGETS Catch2 Catch2WithMain)
+set(CATCH_IMPL_TARGETS ${CATCH_IMPL_TARGETS} PARENT_SCOPE)
 
 # We still do not support building dynamic library with hidden visibility
 # so we want to check & warn users if they do this. However, we won't abort

src/catch2/benchmark/catch_benchmark.hpp

@@ -86,9 +86,7 @@ namespace Catch {
                     auto analysis = Detail::analyse(*cfg, samples.data(), samples.data() + samples.size());
                     BenchmarkStats<> stats{ CATCH_MOVE(info), CATCH_MOVE(analysis.samples), analysis.mean, analysis.standard_deviation, analysis.outliers, analysis.outlier_variance };
                     getResultCapture().benchmarkEnded(stats);
-                } CATCH_CATCH_ANON (TestFailureException const&) {
-                    getResultCapture().benchmarkFailed("Benchmark failed due to failed assertion"_sr);
-                } CATCH_CATCH_ALL{
+                } CATCH_CATCH_ALL {
                     getResultCapture().benchmarkFailed(translateActiveException());
                     // We let the exception go further up so that the
                     // test case is marked as failed.

src/catch2/catch_all.hpp

@@ -37,6 +37,7 @@
 #include <catch2/catch_template_test_macros.hpp>
 #include <catch2/catch_test_case_info.hpp>
 #include <catch2/catch_test_macros.hpp>
+#include <catch2/catch_test_run_info.hpp>
 #include <catch2/catch_test_spec.hpp>
 #include <catch2/catch_timer.hpp>
 #include <catch2/catch_tostring.hpp>
@@ -65,6 +66,7 @@
 #include <catch2/internal/catch_debug_console.hpp>
 #include <catch2/internal/catch_debugger.hpp>
 #include <catch2/internal/catch_decomposer.hpp>
+#include <catch2/internal/catch_deprecation_macro.hpp>
 #include <catch2/internal/catch_enforce.hpp>
 #include <catch2/internal/catch_enum_values_registry.hpp>
 #include <catch2/internal/catch_errno_guard.hpp>
@@ -77,6 +79,7 @@
 #include <catch2/internal/catch_jsonwriter.hpp>
 #include <catch2/internal/catch_lazy_expr.hpp>
 #include <catch2/internal/catch_leak_detector.hpp>
+#include <catch2/internal/catch_lifetimebound.hpp>
 #include <catch2/internal/catch_list.hpp>
 #include <catch2/internal/catch_logical_traits.hpp>
 #include <catch2/internal/catch_message_info.hpp>
@@ -117,15 +120,16 @@
 #include <catch2/internal/catch_test_failure_exception.hpp>
 #include <catch2/internal/catch_test_macro_impl.hpp>
 #include <catch2/internal/catch_test_registry.hpp>
-#include <catch2/internal/catch_test_run_info.hpp>
 #include <catch2/internal/catch_test_spec_parser.hpp>
 #include <catch2/internal/catch_textflow.hpp>
+#include <catch2/internal/catch_thread_support.hpp>
 #include <catch2/internal/catch_to_string.hpp>
 #include <catch2/internal/catch_uncaught_exceptions.hpp>
 #include <catch2/internal/catch_uniform_floating_point_distribution.hpp>
 #include <catch2/internal/catch_uniform_integer_distribution.hpp>
 #include <catch2/internal/catch_unique_name.hpp>
 #include <catch2/internal/catch_unique_ptr.hpp>
+#include <catch2/internal/catch_unreachable.hpp>
 #include <catch2/internal/catch_void_type.hpp>
 #include <catch2/internal/catch_wildcard_pattern.hpp>
 #include <catch2/internal/catch_xmlwriter.hpp>

src/catch2/catch_config.cpp

@@ -119,6 +119,8 @@ namespace Catch {
             m_data.reporterSpecifications.push_back( std::move( *parsed ) );
         }
 
+        // Reading bazel env vars can change some parts of the config data,
+        // so we have to process the bazel env before acting on the config.
         if ( enableBazelEnvSupport() ) {
             readBazelEnvVars();
         }
@@ -183,6 +185,8 @@ namespace Catch {
 
     bool Config::showHelp() const { return m_data.showHelp; }
 
+    std::string const& Config::getExitGuardFilePath() const { return m_data.prematureExitGuardFilePath; }
+
     // IConfig interface
     bool Config::allowThrows() const                   { return !m_data.noThrow; }
     StringRef Config::name() const { return m_data.name.empty() ? m_data.processName : m_data.name; }
@@ -244,6 +248,26 @@ namespace Catch {
                 m_data.shardCount = bazelShardOptions->shardCount;
             }
         }
+
+        const auto bazelExitGuardFile = Detail::getEnv( "TEST_PREMATURE_EXIT_FILE" );
+        if (bazelExitGuardFile) {
+            m_data.prematureExitGuardFilePath = bazelExitGuardFile;
+        }
+
+        const auto bazelRandomSeed = Detail::getEnv( "TEST_RANDOM_SEED" );
+        if ( bazelRandomSeed ) {
+            auto parsedSeed = parseUInt( bazelRandomSeed, 0 );
+            if ( !parsedSeed ) {
+                // Currently we handle issues with parsing other Bazel Env
+                // options by warning and ignoring the issue. So we do the
+                // same for random seed option.
+                Catch::cerr()
+                    << "Warning: could not parse 'TEST_RANDOM_SEED' ('"
+                    << bazelRandomSeed << "') as proper seed.\n";
+            } else {
+                m_data.rngSeed = *parsedSeed;
+            }
+        }
     }
 
 } // end namespace Catch

src/catch2/catch_config.hpp

@@ -87,6 +87,8 @@ namespace Catch {
 
         std::vector<std::string> testsOrTags;
         std::vector<std::string> sectionsToRun;
+
+        std::string prematureExitGuardFilePath;
     };
 
 
@@ -114,6 +116,8 @@ namespace Catch {
 
         bool showHelp() const;
 
+        std::string const& getExitGuardFilePath() const;
+
         // IConfig interface
         bool allowThrows() const override;
         StringRef name() const override;

src/catch2/catch_message.cpp

@@ -7,7 +7,6 @@
 // SPDX-License-Identifier: BSL-1.0
 #include <catch2/catch_message.hpp>
 #include <catch2/interfaces/catch_interfaces_capture.hpp>
-#include <catch2/internal/catch_uncaught_exceptions.hpp>
 #include <catch2/internal/catch_enforce.hpp>
 #include <catch2/internal/catch_move_and_forward.hpp>
 
@@ -20,28 +19,26 @@ namespace Catch {
 
 
     ScopedMessage::ScopedMessage( MessageBuilder&& builder ):
-        m_info( CATCH_MOVE(builder.m_info) ) {
-        m_info.message = builder.m_stream.str();
-        getResultCapture().pushScopedMessage( m_info );
+        m_messageId( builder.m_info.sequence ) {
+        MessageInfo info( CATCH_MOVE( builder.m_info ) );
+        info.message = builder.m_stream.str();
+        IResultCapture::pushScopedMessage( CATCH_MOVE( info ) );
     }
 
     ScopedMessage::ScopedMessage( ScopedMessage&& old ) noexcept:
-        m_info( CATCH_MOVE( old.m_info ) ) {
+        m_messageId( old.m_messageId ) {
         old.m_moved = true;
     }
 
     ScopedMessage::~ScopedMessage() {
-        if ( !uncaught_exceptions() && !m_moved ){
-            getResultCapture().popScopedMessage(m_info);
-        }
+        if ( !m_moved ) { IResultCapture::popScopedMessage( m_messageId ); }
     }
 
 
     Capturer::Capturer( StringRef macroName,
                         SourceLineInfo const& lineInfo,
                         ResultWas::OfType resultType,
-                        StringRef names ):
-        m_resultCapture( getResultCapture() ) {
+                        StringRef names ) {
         auto trimmed = [&] (size_t start, size_t end) {
             while (names[start] == ',' || isspace(static_cast<unsigned char>(names[start]))) {
                 ++start;
@@ -87,8 +84,8 @@ namespace Catch {
             case ',':
                 if (start != pos && openings.empty()) {
                     m_messages.emplace_back(macroName, lineInfo, resultType);
-                    m_messages.back().message = static_cast<std::string>(trimmed(start, pos));
-                    m_messages.back().message += " := ";
+                    m_messages.back().message += trimmed(start, pos);
+                    m_messages.back().message += " := "_sr;
                     start = pos;
                 }
                 break;
@@ -97,21 +94,20 @@ namespace Catch {
         }
         assert(openings.empty() && "Mismatched openings");
         m_messages.emplace_back(macroName, lineInfo, resultType);
-        m_messages.back().message = static_cast<std::string>(trimmed(start, names.size() - 1));
-        m_messages.back().message += " := ";
+        m_messages.back().message += trimmed(start, names.size() - 1);
+        m_messages.back().message += " := "_sr;
     }
     Capturer::~Capturer() {
-        if ( !uncaught_exceptions() ){
-            assert( m_captured == m_messages.size() );
-            for( size_t i = 0; i < m_captured; ++i  )
-                m_resultCapture.popScopedMessage( m_messages[i] );
+        assert( m_captured == m_messages.size() );
+        for (auto const& message : m_messages) {
+            IResultCapture::popScopedMessage( message.sequence );
         }
     }
 
     void Capturer::captureValue( size_t index, std::string const& value ) {
         assert( index < m_messages.size() );
         m_messages[index].message += value;
-        m_resultCapture.pushScopedMessage( m_messages[index] );
+        IResultCapture::pushScopedMessage( CATCH_MOVE( m_messages[index] ) );
         m_captured++;
     }
 

src/catch2/catch_message.hpp

@@ -57,13 +57,12 @@ namespace Catch {
         ScopedMessage( ScopedMessage&& old ) noexcept;
         ~ScopedMessage();
 
-        MessageInfo m_info;
+        unsigned int m_messageId;
         bool m_moved = false;
     };
 
     class Capturer {
         std::vector<MessageInfo> m_messages;
-        IResultCapture& m_resultCapture;
         size_t m_captured = 0;
     public:
         Capturer( StringRef macroName, SourceLineInfo const& lineInfo, ResultWas::OfType resultType, StringRef names );
@@ -111,7 +110,7 @@ namespace Catch {
 
 ///////////////////////////////////////////////////////////////////////////////
 #define INTERNAL_CATCH_UNSCOPED_INFO( macroName, log ) \
-    Catch::getResultCapture().emplaceUnscopedMessage( Catch::MessageBuilder( macroName##_catch_sr, CATCH_INTERNAL_LINEINFO, Catch::ResultWas::Info ) << log )
+    Catch::IResultCapture::emplaceUnscopedMessage( Catch::MessageBuilder( macroName##_catch_sr, CATCH_INTERNAL_LINEINFO, Catch::ResultWas::Info ) << log )
 
 
 #if defined(CATCH_CONFIG_PREFIX_MESSAGES) && !defined(CATCH_CONFIG_DISABLE)

src/catch2/catch_registry_hub.cpp

@@ -96,7 +96,6 @@ namespace Catch {
     }
     void cleanUp() {
         cleanupSingletons();
-        cleanUpContext();
     }
     std::string translateActiveException() {
         return getRegistryHub().getExceptionTranslatorRegistry().translateActiveException();

src/catch2/catch_session.cpp

@@ -26,6 +26,8 @@
 #include <catch2/internal/catch_istream.hpp>
 
 #include <cassert>
+#include <cstdio>
+#include <cstdlib>
 #include <exception>
 #include <iomanip>
 #include <set>
@@ -33,14 +35,6 @@
 namespace Catch {
 
     namespace {
-        static constexpr int TestFailureExitCode = 42;
-        static constexpr int UnspecifiedErrorExitCode = 1;
-        static constexpr int AllTestsSkippedExitCode = 4;
-        static constexpr int NoTestsRunExitCode = 2;
-        static constexpr int UnmatchedTestSpecExitCode = 3;
-        static constexpr int InvalidTestSpecExitCode = 5;
-
-
         IEventListenerPtr createReporter(std::string const& reporterName, ReporterConfig&& config) {
             auto reporter = Catch::getRegistryHub().getReporterRegistry().create(reporterName, CATCH_MOVE(config));
             CATCH_ENFORCE(reporter, "No reporter registered with name: '" << reporterName << '\'');
@@ -148,6 +142,50 @@ namespace Catch {
             }
         }
 
+        // Creates empty file at path. The path must be writable, we do not
+        // try to create directories in path because that's hard in C++14.
+        void setUpGuardFile( std::string const& guardFilePath ) {
+            if ( !guardFilePath.empty() ) {
+#if defined( _MSC_VER )
+                std::FILE* file = nullptr;
+                if ( fopen_s( &file, guardFilePath.c_str(), "w" ) ) {
+                    char msgBuffer[100];
+                    const auto err = errno;
+                    std::string errMsg;
+                    if ( !strerror_s( msgBuffer, err ) ) {
+                        errMsg = msgBuffer;
+                    } else {
+                        errMsg = "Could not translate errno to a string";
+                    }
+
+#else
+                std::FILE* file = std::fopen( guardFilePath.c_str(), "w" );
+                if ( !file ) {
+                    const auto err = errno;
+                    const char* errMsg = std::strerror( err );
+#endif
+
+                    CATCH_RUNTIME_ERROR( "Could not open the exit guard file '"
+                                         << guardFilePath << "' because '"
+                                         << errMsg << "' (" << err << ')' );
+                }
+                const int ret = std::fclose( file );
+                CATCH_ENFORCE(
+                    ret == 0,
+                    "Error when closing the exit guard file: " << ret );
+            }
+        }
+
+        // Removes file at path. Assuming we created it in setUpGuardFile.
+        void tearDownGuardFile( std::string const& guardFilePath ) {
+            if ( !guardFilePath.empty() ) {
+                const int ret = std::remove( guardFilePath.c_str() );
+                CATCH_ENFORCE(
+                    ret == 0,
+                    "Error when removing the exit guard file: " << ret );
+            }
+        }
+
     } // anon namespace
 
     Session::Session() {
@@ -266,6 +304,7 @@ namespace Catch {
             static_cast<void>(std::getchar());
         }
         int exitCode = runInternal();
+
         if( ( m_configData.waitForKeypress & WaitForKeypress::BeforeExit ) != 0 ) {
             Catch::cout() << "...waiting for enter/ return before exiting, with code: " << exitCode << '\n' << std::flush;
             static_cast<void>(std::getchar());
@@ -306,6 +345,10 @@ namespace Catch {
         CATCH_TRY {
             config(); // Force config to be constructed
 
+            // We need to retrieve potential Bazel config with the full Config
+            // constructor, so we have to create the guard file after it is created.
+            setUpGuardFile( m_config->getExitGuardFilePath() );
+
             seedRng( *m_config );
 
             if (m_configData.filenamesAsTags) {
@@ -335,9 +378,12 @@ namespace Catch {
             TestGroup tests { CATCH_MOVE(reporter), m_config.get() };
             auto const totals = tests.execute();
 
+            // If we got here, running the tests finished normally-enough.
+            // They might've failed, but that would've been reported elsewhere.
+            tearDownGuardFile( m_config->getExitGuardFilePath() );
+
             if ( tests.hadUnmatchedTestSpecs()
                 && m_config->warnAboutUnmatchedTestSpecs() ) {
-                // UnmatchedTestSpecExitCode
                 return UnmatchedTestSpecExitCode;
             }
 

src/catch2/catch_session.hpp

@@ -16,6 +16,14 @@
 
 namespace Catch {
 
+    // TODO: Use C++17 `inline` variables
+    constexpr int UnspecifiedErrorExitCode = 1;
+    constexpr int NoTestsRunExitCode = 2;
+    constexpr int UnmatchedTestSpecExitCode = 3;
+    constexpr int AllTestsSkippedExitCode = 4;
+    constexpr int InvalidTestSpecExitCode = 5;
+    constexpr int TestFailureExitCode = 42;
+
     class Session : Detail::NonCopyable {
     public:
 

src/catch2/catch_tag_alias_autoregistrar.hpp

@@ -23,7 +23,7 @@ namespace Catch {
 #define CATCH_REGISTER_TAG_ALIAS( alias, spec ) \
     CATCH_INTERNAL_START_WARNINGS_SUPPRESSION \
     CATCH_INTERNAL_SUPPRESS_GLOBALS_WARNINGS \
-    namespace{ Catch::RegistrarForTagAliases INTERNAL_CATCH_UNIQUE_NAME( AutoRegisterTagAlias )( alias, spec, CATCH_INTERNAL_LINEINFO ); } \
+    namespace{ const Catch::RegistrarForTagAliases INTERNAL_CATCH_UNIQUE_NAME( AutoRegisterTagAlias )( alias, spec, CATCH_INTERNAL_LINEINFO ); } \
     CATCH_INTERNAL_STOP_WARNINGS_SUPPRESSION
 
 #endif // CATCH_TAG_ALIAS_AUTOREGISTRAR_HPP_INCLUDED

src/catch2/catch_test_macros.hpp

@@ -14,6 +14,7 @@
 #include <catch2/internal/catch_section.hpp>
 #include <catch2/internal/catch_test_registry.hpp>
 #include <catch2/internal/catch_unique_name.hpp>
+#include <catch2/internal/catch_unreachable.hpp>
 
 
 // All of our user-facing macros support configuration toggle, that
@@ -47,10 +48,16 @@
   #define CATCH_REGISTER_TEST_CASE( Function, ... ) INTERNAL_CATCH_REGISTER_TESTCASE( Function, __VA_ARGS__ )
   #define CATCH_SECTION( ... ) INTERNAL_CATCH_SECTION( __VA_ARGS__ )
   #define CATCH_DYNAMIC_SECTION( ... ) INTERNAL_CATCH_DYNAMIC_SECTION( __VA_ARGS__ )
-  #define CATCH_FAIL( ... ) INTERNAL_CATCH_MSG( "CATCH_FAIL", Catch::ResultWas::ExplicitFailure, Catch::ResultDisposition::Normal, __VA_ARGS__ )
+  #define CATCH_FAIL( ... ) do { \
+           INTERNAL_CATCH_MSG("CATCH_FAIL", Catch::ResultWas::ExplicitFailure, Catch::ResultDisposition::Normal, __VA_ARGS__ );  \
+           Catch::Detail::Unreachable(); \
+         } while ( false )
   #define CATCH_FAIL_CHECK( ... ) INTERNAL_CATCH_MSG( "CATCH_FAIL_CHECK", Catch::ResultWas::ExplicitFailure, Catch::ResultDisposition::ContinueOnFailure, __VA_ARGS__ )
   #define CATCH_SUCCEED( ... ) INTERNAL_CATCH_MSG( "CATCH_SUCCEED", Catch::ResultWas::Ok, Catch::ResultDisposition::ContinueOnFailure, __VA_ARGS__ )
-  #define CATCH_SKIP( ... ) INTERNAL_CATCH_MSG( "SKIP", Catch::ResultWas::ExplicitSkip, Catch::ResultDisposition::Normal, __VA_ARGS__ )
+  #define CATCH_SKIP( ... ) do { \
+           INTERNAL_CATCH_MSG( "CATCH_SKIP", Catch::ResultWas::ExplicitSkip, Catch::ResultDisposition::Normal, __VA_ARGS__ ); \
+           Catch::Detail::Unreachable(); \
+         } while (false)
 
 
   #if !defined(CATCH_CONFIG_RUNTIME_STATIC_REQUIRE)
@@ -148,10 +155,16 @@
   #define REGISTER_TEST_CASE( Function, ... ) INTERNAL_CATCH_REGISTER_TESTCASE( Function, __VA_ARGS__ )
   #define SECTION( ... ) INTERNAL_CATCH_SECTION( __VA_ARGS__ )
   #define DYNAMIC_SECTION( ... ) INTERNAL_CATCH_DYNAMIC_SECTION( __VA_ARGS__ )
-  #define FAIL( ... ) INTERNAL_CATCH_MSG( "FAIL", Catch::ResultWas::ExplicitFailure, Catch::ResultDisposition::Normal, __VA_ARGS__ )
+  #define FAIL( ... ) do { \
+           INTERNAL_CATCH_MSG( "FAIL", Catch::ResultWas::ExplicitFailure, Catch::ResultDisposition::Normal, __VA_ARGS__ ); \
+           Catch::Detail::Unreachable(); \
+         } while (false)
   #define FAIL_CHECK( ... ) INTERNAL_CATCH_MSG( "FAIL_CHECK", Catch::ResultWas::ExplicitFailure, Catch::ResultDisposition::ContinueOnFailure, __VA_ARGS__ )
   #define SUCCEED( ... ) INTERNAL_CATCH_MSG( "SUCCEED", Catch::ResultWas::Ok, Catch::ResultDisposition::ContinueOnFailure, __VA_ARGS__ )
-  #define SKIP( ... ) INTERNAL_CATCH_MSG( "SKIP", Catch::ResultWas::ExplicitSkip, Catch::ResultDisposition::Normal, __VA_ARGS__ )
+  #define SKIP( ... ) do { \
+           INTERNAL_CATCH_MSG( "SKIP", Catch::ResultWas::ExplicitSkip, Catch::ResultDisposition::Normal, __VA_ARGS__ ); \
+           Catch::Detail::Unreachable(); \
+         } while (false)
 
 
   #if !defined(CATCH_CONFIG_RUNTIME_STATIC_REQUIRE)

src/catch2/catch_tostring.cpp

@@ -8,6 +8,7 @@
 
 #include <catch2/catch_tostring.hpp>
 #include <catch2/interfaces/catch_interfaces_config.hpp>
+#include <catch2/interfaces/catch_interfaces_registry_hub.hpp>
 #include <catch2/internal/catch_context.hpp>
 #include <catch2/internal/catch_polyfills.hpp>
 
@@ -56,39 +57,69 @@ namespace Detail {
         }
     } // end unnamed namespace
 
+    std::size_t catch_strnlen( const char* str, std::size_t n ) {
+        auto ret = std::char_traits<char>::find( str, n, '\0' );
+        if ( ret != nullptr ) { return static_cast<std::size_t>( ret - str ); }
+        return n;
+    }
+
+    std::string formatTimeT(std::time_t time) {
+#ifdef _MSC_VER
+        std::tm timeInfo = {};
+        const auto err = gmtime_s( &timeInfo, &time );
+        if ( err ) {
+            return "gmtime from provided timepoint has failed. This "
+                   "happens e.g. with pre-1970 dates using Microsoft libc";
+        }
+#else
+        std::tm* timeInfo = std::gmtime( &time );
+#endif
+
+        auto const timeStampSize = sizeof( "2017-01-16T17:06:45Z" );
+        char timeStamp[timeStampSize];
+        const char* const fmt = "%Y-%m-%dT%H:%M:%SZ";
+
+#ifdef _MSC_VER
+        std::strftime( timeStamp, timeStampSize, fmt, &timeInfo );
+#else
+        std::strftime( timeStamp, timeStampSize, fmt, timeInfo );
+#endif
+        return std::string( timeStamp, timeStampSize - 1 );
+    }
+
     std::string convertIntoString(StringRef string, bool escapeInvisibles) {
         std::string ret;
         // This is enough for the "don't escape invisibles" case, and a good
         // lower bound on the "escape invisibles" case.
-        ret.reserve(string.size() + 2);
+        ret.reserve( string.size() + 2 );
 
-        if (!escapeInvisibles) {
+        if ( !escapeInvisibles ) {
             ret += '"';
             ret += string;
             ret += '"';
             return ret;
         }
 
+        size_t last_start = 0;
+        auto write_to = [&]( size_t idx ) {
+            if ( last_start < idx ) {
+                ret += string.substr( last_start, idx - last_start );
+            }
+            last_start = idx + 1;
+        };
+
         ret += '"';
-        for (char c : string) {
-            switch (c) {
-            case '\r':
-                ret.append("\\r");
-                break;
-            case '\n':
-                ret.append("\\n");
-                break;
-            case '\t':
-                ret.append("\\t");
-                break;
-            case '\f':
-                ret.append("\\f");
-                break;
-            default:
-                ret.push_back(c);
-                break;
+        for ( size_t i = 0; i < string.size(); ++i ) {
+            const char c = string[i];
+            if ( c == '\r' || c == '\n' || c == '\t' || c == '\f' ) {
+                write_to( i );
+                if ( c == '\r' ) { ret.append( "\\r" ); }
+                if ( c == '\n' ) { ret.append( "\\n" ); }
+                if ( c == '\t' ) { ret.append( "\\t" ); }
+                if ( c == '\f' ) { ret.append( "\\f" ); }
             }
         }
+        write_to( string.size() );
         ret += '"';
 
         return ret;
@@ -113,6 +144,13 @@ namespace Detail {
              rss << std::setw(2) << static_cast<unsigned>(bytes[i]);
        return rss.str();
     }
+
+    std::string makeExceptionHappenedString() {
+        return "{ stringification failed with an exception: \"" +
+               translateActiveException() + "\" }";
+
+    }
+
 } // end Detail namespace
 
 

src/catch2/catch_tostring.hpp

@@ -8,7 +8,7 @@
 #ifndef CATCH_TOSTRING_HPP_INCLUDED
 #define CATCH_TOSTRING_HPP_INCLUDED
 
-
+#include <ctime>
 #include <vector>
 #include <cstddef>
 #include <type_traits>
@@ -40,13 +40,9 @@ namespace Catch {
 
     namespace Detail {
 
-        inline std::size_t catch_strnlen(const char *str, std::size_t n) {
-            auto ret = std::char_traits<char>::find(str, n, '\0');
-            if (ret != nullptr) {
-                return static_cast<std::size_t>(ret - str);
-            }
-            return n;
-        }
+        std::size_t catch_strnlen(const char *str, std::size_t n);
+
+        std::string formatTimeT( std::time_t time );
 
         constexpr StringRef unprintableString = "{?}"_sr;
 
@@ -139,11 +135,17 @@ namespace Catch {
 
     namespace Detail {
 
+        std::string makeExceptionHappenedString();
+
         // This function dispatches all stringification requests inside of Catch.
         // Should be preferably called fully qualified, like ::Catch::Detail::stringify
         template <typename T>
-        std::string stringify(const T& e) {
-            return ::Catch::StringMaker<std::remove_cv_t<std::remove_reference_t<T>>>::convert(e);
+        std::string stringify( const T& e ) {
+            CATCH_TRY {
+                return ::Catch::StringMaker<
+                    std::remove_cv_t<std::remove_reference_t<T>>>::convert( e );
+            }
+            CATCH_CATCH_ALL { return makeExceptionHappenedString(); }
         }
 
         template<typename E>
@@ -405,44 +407,38 @@ namespace Catch {
 
 // Separate std::tuple specialization
 #if defined(CATCH_CONFIG_ENABLE_TUPLE_STRINGMAKER)
-#include <tuple>
+#    include <tuple>
+#    include <utility>
 namespace Catch {
     namespace Detail {
-        template<
-            typename Tuple,
-            std::size_t N = 0,
-            bool = (N < std::tuple_size<Tuple>::value)
-            >
-            struct TupleElementPrinter {
-            static void print(const Tuple& tuple, std::ostream& os) {
-                os << (N ? ", " : " ")
-                    << ::Catch::Detail::stringify(std::get<N>(tuple));
-                TupleElementPrinter<Tuple, N + 1>::print(tuple, os);
-            }
-        };
+        template <typename Tuple, std::size_t... Is>
+        void PrintTuple( const Tuple& tuple,
+                         std::ostream& os,
+                         std::index_sequence<Is...> ) {
+            // 1 + Account for when the tuple is empty
+            char a[1 + sizeof...( Is )] = {
+                ( ( os << ( Is ? ", " : " " )
+                       << ::Catch::Detail::stringify( std::get<Is>( tuple ) ) ),
+                  '\0' )... };
+            (void)a;
+        }
 
-        template<
-            typename Tuple,
-            std::size_t N
-        >
-            struct TupleElementPrinter<Tuple, N, false> {
-            static void print(const Tuple&, std::ostream&) {}
-        };
+    } // namespace Detail
 
-    }
-
-
-    template<typename ...Types>
+    template <typename... Types>
     struct StringMaker<std::tuple<Types...>> {
-        static std::string convert(const std::tuple<Types...>& tuple) {
+        static std::string convert( const std::tuple<Types...>& tuple ) {
             ReusableStringStream rss;
             rss << '{';
-            Detail::TupleElementPrinter<std::tuple<Types...>>::print(tuple, rss.get());
+            Detail::PrintTuple(
+                tuple,
+                rss.get(),
+                std::make_index_sequence<sizeof...( Types )>{} );
             rss << " }";
             return rss.str();
         }
     };
-}
+} // namespace Catch
 #endif // CATCH_CONFIG_ENABLE_TUPLE_STRINGMAKER
 
 #if defined(CATCH_CONFIG_ENABLE_VARIANT_STRINGMAKER) && defined(CATCH_CONFIG_CPP17_VARIANT)
@@ -626,29 +622,10 @@ struct ratio_string<std::milli> {
     template<typename Duration>
     struct StringMaker<std::chrono::time_point<std::chrono::system_clock, Duration>> {
         static std::string convert(std::chrono::time_point<std::chrono::system_clock, Duration> const& time_point) {
-            auto converted = std::chrono::system_clock::to_time_t(time_point);
-
-#ifdef _MSC_VER
-            std::tm timeInfo = {};
-            const auto err = gmtime_s(&timeInfo, &converted);
-            if ( err ) {
-                return "gmtime from provided timepoint has failed. This "
-                       "happens e.g. with pre-1970 dates using Microsoft libc";
-            }
-#else
-            std::tm* timeInfo = std::gmtime(&converted);
-#endif
-
-            auto const timeStampSize = sizeof("2017-01-16T17:06:45Z");
-            char timeStamp[timeStampSize];
-            const char * const fmt = "%Y-%m-%dT%H:%M:%SZ";
-
-#ifdef _MSC_VER
-            std::strftime(timeStamp, timeStampSize, fmt, &timeInfo);
-#else
-            std::strftime(timeStamp, timeStampSize, fmt, timeInfo);
-#endif
-            return std::string(timeStamp, timeStampSize - 1);
+            const auto systemish = std::chrono::time_point_cast<
+                std::chrono::system_clock::duration>( time_point );
+            const auto as_time_t = std::chrono::system_clock::to_time_t( systemish );
+            return ::Catch::Detail::formatTimeT( as_time_t );
         }
     };
 }

src/catch2/catch_translate_exception.hpp

@@ -65,7 +65,7 @@ namespace Catch {
     static std::string translatorName( signature ); \
     CATCH_INTERNAL_START_WARNINGS_SUPPRESSION \
     CATCH_INTERNAL_SUPPRESS_GLOBALS_WARNINGS \
-    namespace{ Catch::ExceptionTranslatorRegistrar INTERNAL_CATCH_UNIQUE_NAME( catch_internal_ExceptionRegistrar )( &translatorName ); } \
+    namespace{ const Catch::ExceptionTranslatorRegistrar INTERNAL_CATCH_UNIQUE_NAME( catch_internal_ExceptionRegistrar )( &translatorName ); } \
     CATCH_INTERNAL_STOP_WARNINGS_SUPPRESSION \
     static std::string translatorName( signature )
 

src/catch2/catch_user_config.hpp.in

@@ -187,6 +187,24 @@
 #endif
 
 
+#cmakedefine CATCH_CONFIG_DEPRECATION_ANNOTATIONS
+#cmakedefine CATCH_CONFIG_NO_DEPRECATION_ANNOTATIONS
+
+#if defined( CATCH_CONFIG_DEPRECATION_ANNOTATIONS ) && \
+    defined( CATCH_CONFIG_NO_DEPRECATION_ANNOTATIONS )
+#    error Cannot force DEPRECATION_ANNOTATIONS to both ON and OFF
+#endif
+
+
+#cmakedefine CATCH_CONFIG_EXPERIMENTAL_THREAD_SAFE_ASSERTIONS
+#cmakedefine CATCH_CONFIG_NO_EXPERIMENTAL_THREAD_SAFE_ASSERTIONS
+
+#if defined( CATCH_CONFIG_EXPERIMENTAL_THREAD_SAFE_ASSERTIONS ) && \
+    defined( CATCH_CONFIG_NO_EXPERIMENTAL_THREAD_SAFE_ASSERTIONS )
+#    error Cannot force EXPERIMENTAL_THREAD_SAFE_ASSERTIONS to both ON and OFF
+#endif
+
+
 // ------
 // Simple toggle defines
 // their value is never used and they cannot be overridden

src/catch2/catch_version.cpp

@@ -36,7 +36,7 @@ namespace Catch {
     }
 
     Version const& libraryVersion() {
-        static Version version( 3, 8, 1, "", 0 );
+        static Version version( 3, 11, 0, "", 0 );
         return version;
     }
 

src/catch2/catch_version_macros.hpp

@@ -9,7 +9,7 @@
 #define CATCH_VERSION_MACROS_HPP_INCLUDED
 
 #define CATCH_VERSION_MAJOR 3
-#define CATCH_VERSION_MINOR 8
-#define CATCH_VERSION_PATCH 1
+#define CATCH_VERSION_MINOR 11
+#define CATCH_VERSION_PATCH 0
 
 #endif // CATCH_VERSION_MACROS_HPP_INCLUDED

src/catch2/generators/catch_generator_exception.hpp

@@ -23,7 +23,7 @@ namespace Catch {
             m_msg(msg)
         {}
 
-        const char* what() const noexcept override final;
+        const char* what() const noexcept final;
     };
 
 } // end namespace Catch

src/catch2/generators/catch_generators_adapters.hpp

@@ -58,8 +58,9 @@ namespace Generators {
     class FilterGenerator final : public IGenerator<T> {
         GeneratorWrapper<T> m_generator;
         Predicate m_predicate;
+        static_assert(!std::is_reference<Predicate>::value, "This would most likely result in a dangling reference");
     public:
-        template <typename P = Predicate>
+        template <typename P>
         FilterGenerator(P&& pred, GeneratorWrapper<T>&& generator):
             m_generator(CATCH_MOVE(generator)),
             m_predicate(CATCH_FORWARD(pred))
@@ -91,7 +92,7 @@ namespace Generators {
 
     template <typename T, typename Predicate>
     GeneratorWrapper<T> filter(Predicate&& pred, GeneratorWrapper<T>&& generator) {
-        return GeneratorWrapper<T>(Catch::Detail::make_unique<FilterGenerator<T, Predicate>>(CATCH_FORWARD(pred), CATCH_MOVE(generator)));
+        return GeneratorWrapper<T>(Catch::Detail::make_unique<FilterGenerator<T, typename std::remove_reference<Predicate>::type>>(CATCH_FORWARD(pred), CATCH_MOVE(generator)));
     }
 
     template <typename T>

src/catch2/interfaces/catch_interfaces_capture.cpp

@@ -7,7 +7,14 @@
 // SPDX-License-Identifier: BSL-1.0
 
 #include <catch2/interfaces/catch_interfaces_capture.hpp>
+#include <catch2/internal/catch_enforce.hpp>
 
 namespace Catch {
+    namespace Detail {
+        void missingCaptureInstance() {
+            CATCH_INTERNAL_ERROR( "No result capture instance" );
+        }
+    } // namespace Detail
+
     IResultCapture::~IResultCapture() = default;
-}
+} // namespace Catch

src/catch2/interfaces/catch_interfaces_capture.hpp

@@ -10,6 +10,7 @@
 
 #include <string>
 
+#include <catch2/internal/catch_context.hpp>
 #include <catch2/internal/catch_stringref.hpp>
 #include <catch2/internal/catch_result_type.hpp>
 #include <catch2/internal/catch_unique_ptr.hpp>
@@ -62,10 +63,9 @@ namespace Catch {
         virtual void benchmarkEnded( BenchmarkStats<> const& stats ) = 0;
         virtual void benchmarkFailed( StringRef error ) = 0;
 
-        virtual void pushScopedMessage( MessageInfo const& message ) = 0;
-        virtual void popScopedMessage( MessageInfo const& message ) = 0;
-
-        virtual void emplaceUnscopedMessage( MessageBuilder&& builder ) = 0;
+        static void pushScopedMessage( MessageInfo&& message );
+        static void popScopedMessage( unsigned int messageId );
+        static void emplaceUnscopedMessage( MessageBuilder&& builder );
 
         virtual void handleFatalErrorCondition( StringRef message ) = 0;
 
@@ -93,9 +93,7 @@ namespace Catch {
                     AssertionReaction &reaction ) = 0;
 
 
-
         virtual bool lastAssertionPassed() = 0;
-        virtual void assertionPassed() = 0;
 
         // Deprecated, do not use:
         virtual std::string getCurrentTestName() const = 0;
@@ -103,7 +101,18 @@ namespace Catch {
         virtual void exceptionEarlyReported() = 0;
     };
 
-    IResultCapture& getResultCapture();
+    namespace Detail {
+        [[noreturn]]
+        void missingCaptureInstance();
+    }
+    inline IResultCapture& getResultCapture() {
+        if (auto* capture = getCurrentContext().getResultCapture()) {
+            return *capture;
+        } else {
+            Detail::missingCaptureInstance();
+        }
+    }
+
 }
 
 #endif // CATCH_INTERFACES_CAPTURE_HPP_INCLUDED

src/catch2/interfaces/catch_interfaces_reporter.hpp

@@ -9,11 +9,11 @@
 #define CATCH_INTERFACES_REPORTER_HPP_INCLUDED
 
 #include <catch2/catch_section_info.hpp>
+#include <catch2/catch_test_run_info.hpp>
 #include <catch2/catch_totals.hpp>
 #include <catch2/catch_assertion_result.hpp>
 #include <catch2/internal/catch_message_info.hpp>
 #include <catch2/internal/catch_stringref.hpp>
-#include <catch2/internal/catch_test_run_info.hpp>
 #include <catch2/internal/catch_unique_ptr.hpp>
 #include <catch2/benchmark/detail/catch_benchmark_stats.hpp>
 
@@ -115,6 +115,11 @@ namespace Catch {
         //! Catch2 should call `Reporter::assertionEnded` even for passing
         //! assertions
         bool shouldReportAllAssertions = false;
+        //! Catch2 should call `Reporter::assertionStarting` for all assertions
+        // Defaults to true for backwards compatibility, but none of our current
+        // reporters actually want this, and it enables a fast path in assertion
+        // handling.
+        bool shouldReportAllAssertionStarts = true;
     };
 
     /**

src/catch2/internal/catch_clara.hpp

@@ -66,15 +66,13 @@ namespace Catch {
             };
 
             template <typename F, typename = void>
-            struct is_unary_function : std::false_type {};
+            static constexpr bool is_unary_function_v = false;
 
             template <typename F>
-            struct is_unary_function<
+            static constexpr bool is_unary_function_v<
                 F,
-                Catch::Detail::void_t<decltype(
-                    std::declval<F>()( fake_arg() ) )
-                >
-            > : std::true_type {};
+                Catch::Detail::void_t<decltype( std::declval<F>()(
+                    fake_arg() ) )>> = true;
 
             // Traits for extracting arg and return type of lambdas (for single
             // argument lambdas)
@@ -507,14 +505,14 @@ namespace Catch {
 
                 template <typename T,
                           typename = typename std::enable_if_t<
-                              !Detail::is_unary_function<T>::value>>
+                              !Detail::is_unary_function_v<T>>>
                 ParserRefImpl( T& ref, StringRef hint ):
                     m_ref( std::make_shared<BoundValueRef<T>>( ref ) ),
                     m_hint( hint ) {}
 
                 template <typename LambdaT,
                           typename = typename std::enable_if_t<
-                              Detail::is_unary_function<LambdaT>::value>>
+                              Detail::is_unary_function_v<LambdaT>>>
                 ParserRefImpl( LambdaT const& ref, StringRef hint ):
                     m_ref( std::make_shared<BoundLambda<LambdaT>>( ref ) ),
                     m_hint( hint ) {}
@@ -581,7 +579,7 @@ namespace Catch {
 
             template <typename LambdaT,
                       typename = typename std::enable_if_t<
-                          Detail::is_unary_function<LambdaT>::value>>
+                          Detail::is_unary_function_v<LambdaT>>>
             Opt( LambdaT const& ref, StringRef hint ):
                 ParserRefImpl( ref, hint ) {}
 
@@ -591,7 +589,7 @@ namespace Catch {
 
             template <typename T,
                       typename = typename std::enable_if_t<
-                          !Detail::is_unary_function<T>::value>>
+                          !Detail::is_unary_function_v<T>>>
             Opt( T& ref, StringRef hint ):
                 ParserRefImpl( ref, hint ) {}
 

src/catch2/internal/catch_commandline.cpp

@@ -305,6 +305,9 @@ namespace Catch {
             | Opt( config.allowZeroTests )
                 ["--allow-running-no-tests"]
                 ( "Treat 'No tests run' as a success" )
+            | Opt( config.prematureExitGuardFilePath, "path" )
+                ["--premature-exit-guard-file"]
+                ( "create a file before running tests and delete it during clean exit" )
             | Arg( config.testsOrTags, "test name|pattern|tags" )
                 ( "which test or tests to use" );
 

src/catch2/internal/catch_compiler_capabilities.hpp

@@ -220,13 +220,17 @@
 #    endif
 
 // Universal Windows platform does not support SEH
-// Or console colours (or console at all...)
-#  if defined(CATCH_PLATFORM_WINDOWS_UWP)
-#    define CATCH_INTERNAL_CONFIG_NO_COLOUR_WIN32
-#  else
+#  if !defined(CATCH_PLATFORM_WINDOWS_UWP)
 #    define CATCH_INTERNAL_CONFIG_WINDOWS_SEH
 #  endif
 
+// Only some Windows platform families support the console
+#  if defined(WINAPI_FAMILY_PARTITION)
+#    if !WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP | WINAPI_PARTITION_SYSTEM)
+#      define CATCH_INTERNAL_CONFIG_NO_COLOUR_WIN32
+#    endif
+#  endif
+
 // MSVC traditional preprocessor needs some workaround for __VA_ARGS__
 // _MSVC_TRADITIONAL == 0 means new conformant preprocessor
 // _MSVC_TRADITIONAL == 1 means old traditional non-conformant preprocessor

src/catch2/internal/catch_console_colour.cpp

@@ -161,7 +161,11 @@ namespace {
 #endif // Windows/ ANSI/ None
 
 
-#if defined( CATCH_PLATFORM_LINUX ) || defined( CATCH_PLATFORM_MAC ) || defined( __GLIBC__ )
+#if defined( CATCH_PLATFORM_LINUX ) \
+ || defined( CATCH_PLATFORM_MAC ) \
+ || defined( __GLIBC__ ) \
+ || defined( __FreeBSD__ ) \
+ || defined( CATCH_PLATFORM_QNX )
 #    define CATCH_INTERNAL_HAS_ISATTY
 #    include <unistd.h>
 #endif

src/catch2/internal/catch_context.cpp

@@ -6,25 +6,14 @@
 
 // SPDX-License-Identifier: BSL-1.0
 #include <catch2/internal/catch_context.hpp>
-#include <catch2/internal/catch_noncopyable.hpp>
 #include <catch2/internal/catch_random_number_generator.hpp>
 
 namespace Catch {
 
-    Context* Context::currentContext = nullptr;
-
-    void cleanUpContext() {
-        delete Context::currentContext;
-        Context::currentContext = nullptr;
-    }
-    void Context::createContext() {
-        currentContext = new Context();
-    }
+    Context Context::currentContext;
 
     Context& getCurrentMutableContext() {
-        if ( !Context::currentContext ) { Context::createContext(); }
-        // NOLINTNEXTLINE(clang-analyzer-core.uninitialized.UndefReturn)
-        return *Context::currentContext;
+        return Context::currentContext;
     }
 
     SimplePcg32& sharedRng() {

src/catch2/internal/catch_context.hpp

@@ -19,11 +19,9 @@ namespace Catch {
         IConfig const* m_config = nullptr;
         IResultCapture* m_resultCapture = nullptr;
 
-        CATCH_EXPORT static Context* currentContext;
+        CATCH_EXPORT static Context currentContext;
         friend Context& getCurrentMutableContext();
         friend Context const& getCurrentContext();
-        static void createContext();
-        friend void cleanUpContext();
 
     public:
         constexpr IResultCapture* getResultCapture() const {
@@ -34,21 +32,14 @@ namespace Catch {
             m_resultCapture = resultCapture;
         }
         constexpr void setConfig( IConfig const* config ) { m_config = config; }
-
     };
 
     Context& getCurrentMutableContext();
 
     inline Context const& getCurrentContext() {
-        // We duplicate the logic from `getCurrentMutableContext` here,
-        // to avoid paying the call overhead in debug mode.
-        if ( !Context::currentContext ) { Context::createContext(); }
-        // NOLINTNEXTLINE(clang-analyzer-core.uninitialized.UndefReturn)
-        return *Context::currentContext;
+        return Context::currentContext;
     }
 
-    void cleanUpContext();
-
     class SimplePcg32;
     SimplePcg32& sharedRng();
 }

src/catch2/internal/catch_debugger.cpp

@@ -69,7 +69,7 @@
         #endif
     } // namespace Catch
 
-#elif defined(CATCH_PLATFORM_LINUX)
+#elif defined(CATCH_PLATFORM_LINUX) || defined(CATCH_PLATFORM_QNX)
     #include <fstream>
     #include <string>
 

src/catch2/internal/catch_debugger.hpp

@@ -14,6 +14,17 @@ namespace Catch {
     bool isDebuggerActive();
 }
 
+#if !defined( CATCH_TRAP ) && defined( __clang__ ) && defined( __has_builtin )
+#    if __has_builtin( __builtin_debugtrap )
+#        define CATCH_TRAP() __builtin_debugtrap()
+#    endif
+#endif
+
+#if !defined( CATCH_TRAP ) && defined( _MSC_VER )
+#    define CATCH_TRAP() __debugbreak()
+#endif
+
+#if !defined(CATCH_TRAP) // If we couldn't use compiler-specific impl from above, we get into platform-specific options
 #ifdef CATCH_PLATFORM_MAC
 
     #if defined(__i386__) || defined(__x86_64__)
@@ -38,7 +49,7 @@ namespace Catch {
         #define CATCH_TRAP()  __asm__(".inst 0xde01")
     #endif
 
-#elif defined(CATCH_PLATFORM_LINUX)
+#elif defined(CATCH_PLATFORM_LINUX) || defined(CATCH_PLATFORM_QNX)
     // If we can use inline assembler, do it because this allows us to break
     // directly at the location of the failing check instead of breaking inside
     // raise() called from it, i.e. one stack frame below.
@@ -49,15 +60,15 @@ namespace Catch {
 
         #define CATCH_TRAP() raise(SIGTRAP)
     #endif
-#elif defined(_MSC_VER)
-    #define CATCH_TRAP() __debugbreak()
 #elif defined(__MINGW32__)
     extern "C" __declspec(dllimport) void __stdcall DebugBreak();
     #define CATCH_TRAP() DebugBreak()
 #endif
+#endif // ^^ CATCH_TRAP is not defined yet, so we define it
 
-#ifndef CATCH_BREAK_INTO_DEBUGGER
-    #ifdef CATCH_TRAP
+
+#if !defined(CATCH_BREAK_INTO_DEBUGGER)
+    #if defined(CATCH_TRAP)
         #define CATCH_BREAK_INTO_DEBUGGER() []{ if( Catch::isDebuggerActive() ) { CATCH_TRAP(); } }()
     #else
         #define CATCH_BREAK_INTO_DEBUGGER() []{}()

src/catch2/internal/catch_decomposer.hpp

@@ -78,10 +78,11 @@
  *
  * 3) If a type has no linkage, we also cannot capture it by reference.
  *    The solution is once again to capture them by value. We handle
- *    the common cases by using `std::is_arithmetic` as the default
- *    for `Catch::capture_by_value`, but that is only a some-effort
- *    heuristic. But as with 2), users can specialize `capture_by_value`
- *    for their own types as needed.
+ *    the common cases by using `std::is_arithmetic` and `std::is_enum`
+ *    as the default for `Catch::capture_by_value`, but that is only a
+ *    some-effort heuristic. These combine to capture all possible bitfield
+ *    bases, and also some trait-like types. As with 2), users can
+ *    specialize `capture_by_value` for their own types as needed.
  *
  * 4) To support C++20 and make the SFINAE on our decomposing operators
  *    work, the SFINAE has to happen in return type, rather than in
@@ -133,13 +134,22 @@ namespace Catch {
         using RemoveCVRef_t = std::remove_cv_t<std::remove_reference_t<T>>;
     }
 
-    // Note: There is nothing that stops us from extending this,
-    //       e.g. to `std::is_scalar`, but the more encompassing
-    //       traits are usually also more expensive. For now we
-    //       keep this as it used to be and it can be changed later.
+    // Note: This is about as much as we can currently reasonably support.
+    //       In an ideal world, we could capture by value small trivially
+    //       copyable types, but the actual `std::is_trivially_copyable`
+    //       trait is a huge mess with standard-violating results on
+    //       GCC and Clang, which are unlikely to be fixed soon due to ABI
+    //       concerns.
+    //       `std::is_scalar` also causes issues due to the `is_pointer`
+    //       component, which causes ambiguity issues with (references-to)
+    //       function pointer. If those are resolved, we still need to
+    //       disambiguate the overload set for arrays, through explicit
+    //       overload for references to sized arrays.
     template <typename T>
     struct capture_by_value
-        : std::integral_constant<bool, std::is_arithmetic<T>{}> {};
+        : std::integral_constant<bool,
+                                 std::is_arithmetic<T>::value ||
+                                     std::is_enum<T>::value> {};
 
 #if defined( CATCH_CONFIG_CPP20_COMPARE_OVERLOADS )
     template <>

src/catch2/internal/catch_deprecation_macro.hpp

@@ -0,0 +1,19 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+#ifndef CATCH_DEPRECATION_MACRO_HPP_INCLUDED
+#define CATCH_DEPRECATION_MACRO_HPP_INCLUDED
+
+#include <catch2/catch_user_config.hpp>
+
+#if !defined( CATCH_CONFIG_NO_DEPRECATION_ANNOTATIONS )
+#    define DEPRECATED( msg ) [[deprecated( msg )]]
+#else
+#    define DEPRECATED( msg )
+#endif
+
+#endif // CATCH_DEPRECATION_MACRO_HPP_INCLUDED

src/catch2/internal/catch_exception_translator_registry.cpp

@@ -59,10 +59,10 @@ namespace Catch {
         // To avoid having to handle TFE explicitly everywhere, we just
         // rethrow it so that it goes back up the caller.
         catch( TestFailureException& ) {
-            std::rethrow_exception(std::current_exception());
+            return "{ nested assertion failed }";
         }
         catch( TestSkipException& ) {
-            std::rethrow_exception(std::current_exception());
+            return "{ nested SKIP() called }";
         }
         catch( std::exception const& ex ) {
             return ex.what();

src/catch2/internal/catch_fatal_condition_handler.cpp

@@ -79,30 +79,34 @@ namespace Catch {
     // There is no 1-1 mapping between signals and windows exceptions.
     // Windows can easily distinguish between SO and SigSegV,
     // but SigInt, SigTerm, etc are handled differently.
-    static SignalDefs signalDefs[] = {
+    static constexpr SignalDefs signalDefs[] = {
         { EXCEPTION_ILLEGAL_INSTRUCTION,  "SIGILL - Illegal instruction signal" },
         { EXCEPTION_STACK_OVERFLOW, "SIGSEGV - Stack overflow" },
         { EXCEPTION_ACCESS_VIOLATION, "SIGSEGV - Segmentation violation signal" },
         { EXCEPTION_INT_DIVIDE_BY_ZERO, "Divide by zero error" },
     };
 
+    // Since we do not support multiple instantiations, we put these
+    // into global variables and rely on cleaning them up in outlined
+    // constructors/destructors
+    static LPTOP_LEVEL_EXCEPTION_FILTER previousTopLevelExceptionFilter = nullptr;
+
+
     static LONG CALLBACK topLevelExceptionFilter(PEXCEPTION_POINTERS ExceptionInfo) {
         for (auto const& def : signalDefs) {
             if (ExceptionInfo->ExceptionRecord->ExceptionCode == def.id) {
                 reportFatal(def.name);
             }
         }
-        // If its not an exception we care about, pass it along.
+        // If a filter was previously registered, invoke it
+        if (previousTopLevelExceptionFilter) {
+            return previousTopLevelExceptionFilter(ExceptionInfo);
+        }
+        // Otherwise, pass along all exceptions.
         // This stops us from eating debugger breaks etc.
         return EXCEPTION_CONTINUE_SEARCH;
     }
 
-    // Since we do not support multiple instantiations, we put these
-    // into global variables and rely on cleaning them up in outlined
-    // constructors/destructors
-    static LPTOP_LEVEL_EXCEPTION_FILTER previousTopLevelExceptionFilter = nullptr;
-
-
     // For MSVC, we reserve part of the stack memory for handling
     // memory overflow structured exception.
     FatalConditionHandler::FatalConditionHandler() {
@@ -150,7 +154,7 @@ namespace Catch {
         const char* name;
     };
 
-    static SignalDefs signalDefs[] = {
+    static constexpr SignalDefs signalDefs[] = {
         { SIGINT,  "SIGINT - Terminal interrupt signal" },
         { SIGILL,  "SIGILL - Illegal instruction signal" },
         { SIGFPE,  "SIGFPE - Floating point error signal" },

src/catch2/internal/catch_jsonwriter.cpp

@@ -7,8 +7,36 @@
 // SPDX-License-Identifier: BSL-1.0
 #include <catch2/internal/catch_enforce.hpp>
 #include <catch2/internal/catch_jsonwriter.hpp>
+#include <catch2/internal/catch_unreachable.hpp>
 
 namespace Catch {
+
+    namespace {
+        static bool needsEscape( char c ) {
+            return c == '"' || c == '\\' || c == '\b' || c == '\f' ||
+                   c == '\n' || c == '\r' || c == '\t';
+        }
+
+        static Catch::StringRef makeEscapeStringRef( char c ) {
+            if ( c == '"' ) {
+                return "\\\""_sr;
+            } else if ( c == '\\' ) {
+                return "\\\\"_sr;
+            } else if ( c == '\b' ) {
+                return "\\b"_sr;
+            } else if ( c == '\f' ) {
+                return "\\f"_sr;
+            } else if ( c == '\n' ) {
+                return "\\n"_sr;
+            } else if ( c == '\r' ) {
+                return "\\r"_sr;
+            } else if ( c == '\t' ) {
+                return "\\t"_sr;
+            }
+            Catch::Detail::Unreachable();
+        }
+    } // namespace
+
     void JsonUtils::indent( std::ostream& os, std::uint64_t level ) {
         for ( std::uint64_t i = 0; i < level; ++i ) {
             os << "  ";
@@ -118,30 +146,19 @@ namespace Catch {
 
     void JsonValueWriter::writeImpl( Catch::StringRef value, bool quote ) {
         if ( quote ) { m_os << '"'; }
-        for (char c : value) {
-            // Escape list taken from https://www.json.org/json-en.html,
-            // string definition.
-            // Note that while forward slash _can_ be escaped, it does
-            // not have to be, if JSON is not further embedded somewhere
-            // where forward slash is meaningful.
-            if ( c == '"' ) {
-                m_os << "\\\"";
-            } else if ( c == '\\' ) {
-                m_os << "\\\\";
-            } else if ( c == '\b' ) {
-                m_os << "\\b";
-            } else if ( c == '\f' ) {
-                m_os << "\\f";
-            } else if ( c == '\n' ) {
-                m_os << "\\n";
-            } else if ( c == '\r' ) {
-                m_os << "\\r";
-            } else if ( c == '\t' ) {
-                m_os << "\\t";
-            } else {
-                m_os << c;
+        size_t current_start = 0;
+        for ( size_t i = 0; i < value.size(); ++i ) {
+            if ( needsEscape( value[i] ) ) {
+                if ( current_start < i ) {
+                    m_os << value.substr( current_start, i - current_start );
+                }
+                m_os << makeEscapeStringRef( value[i] );
+                current_start = i + 1;
             }
         }
+        if ( current_start < value.size() ) {
+            m_os << value.substr( current_start, value.size() - current_start );
+        }
         if ( quote ) { m_os << '"'; }
     }
 

src/catch2/internal/catch_lifetimebound.hpp

@@ -0,0 +1,24 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
+#ifndef CATCH_LIFETIMEBOUND_HPP_INCLUDED
+#define CATCH_LIFETIMEBOUND_HPP_INCLUDED
+
+#if !defined( __has_cpp_attribute )
+#    define CATCH_ATTR_LIFETIMEBOUND
+#elif __has_cpp_attribute( msvc::lifetimebound )
+#    define CATCH_ATTR_LIFETIMEBOUND [[msvc::lifetimebound]]
+#elif __has_cpp_attribute( clang::lifetimebound )
+#    define CATCH_ATTR_LIFETIMEBOUND [[clang::lifetimebound]]
+#elif __has_cpp_attribute( lifetimebound )
+#    define CATCH_ATTR_LIFETIMEBOUND [[lifetimebound]]
+#else
+#    define CATCH_ATTR_LIFETIMEBOUND
+#endif
+
+#endif // CATCH_LIFETIMEBOUND_HPP_INCLUDED

src/catch2/internal/catch_main.cpp

@@ -14,7 +14,7 @@
 namespace Catch {
     CATCH_INTERNAL_START_WARNINGS_SUPPRESSION
     CATCH_INTERNAL_SUPPRESS_GLOBALS_WARNINGS
-    static LeakDetector leakDetector;
+    static const LeakDetector leakDetector;
     CATCH_INTERNAL_STOP_WARNINGS_SUPPRESSION
 }
 

src/catch2/internal/catch_message_info.cpp

@@ -10,16 +10,17 @@
 
 namespace Catch {
 
-    MessageInfo::MessageInfo(   StringRef _macroName,
-                                SourceLineInfo const& _lineInfo,
-                                ResultWas::OfType _type )
+    MessageInfo::MessageInfo( StringRef _macroName,
+                              SourceLineInfo const& _lineInfo,
+                              ResultWas::OfType _type )
     :   macroName( _macroName ),
         lineInfo( _lineInfo ),
         type( _type ),
         sequence( ++globalCount )
     {}
 
-    // This may need protecting if threading support is added
-    unsigned int MessageInfo::globalCount = 0;
+    // Messages are owned by their individual threads, so the counter should be thread-local as well.
+    // Alternative consideration: atomic, so threads don't share IDs and things are easier to debug.
+    thread_local unsigned int MessageInfo::globalCount = 0;
 
 } // end namespace Catch

src/catch2/internal/catch_message_info.hpp

@@ -8,6 +8,7 @@
 #ifndef CATCH_MESSAGE_INFO_HPP_INCLUDED
 #define CATCH_MESSAGE_INFO_HPP_INCLUDED
 
+#include <catch2/internal/catch_deprecation_macro.hpp>
 #include <catch2/internal/catch_result_type.hpp>
 #include <catch2/internal/catch_source_line_info.hpp>
 #include <catch2/internal/catch_stringref.hpp>
@@ -25,16 +26,19 @@ namespace Catch {
         std::string message;
         SourceLineInfo lineInfo;
         ResultWas::OfType type;
+        // The "ID" of the message, used to know when to remove it from reporter context.
         unsigned int sequence;
 
+        DEPRECATED( "Explicitly use the 'sequence' member instead" )
         bool operator == (MessageInfo const& other) const {
             return sequence == other.sequence;
         }
+        DEPRECATED( "Explicitly use the 'sequence' member instead" )
         bool operator < (MessageInfo const& other) const {
             return sequence < other.sequence;
         }
     private:
-        static unsigned int globalCount;
+        static thread_local unsigned int globalCount;
     };
 
 } // end namespace Catch

src/catch2/internal/catch_noncopyable.hpp

@@ -13,6 +13,7 @@ namespace Catch {
 
         //! Deriving classes become noncopyable and nonmovable
         class NonCopyable {
+        public:
             NonCopyable( NonCopyable const& ) = delete;
             NonCopyable( NonCopyable&& ) = delete;
             NonCopyable& operator=( NonCopyable const& ) = delete;

src/catch2/internal/catch_platform.hpp

@@ -25,6 +25,9 @@
 #elif defined(linux) || defined(__linux) || defined(__linux__)
 #  define CATCH_PLATFORM_LINUX
 
+#elif defined(__QNX__)
+#  define CATCH_PLATFORM_QNX
+
 #elif defined(WIN32) || defined(__WIN32__) || defined(_WIN32) || defined(_MSC_VER) || defined(__MINGW32__)
 #  define CATCH_PLATFORM_WINDOWS
 

src/catch2/internal/catch_preprocessor.hpp

@@ -16,6 +16,15 @@
 #endif
 
 
+namespace Catch {
+    namespace Detail {
+        template <int N>
+        struct priority_tag : priority_tag<N - 1> {};
+        template <>
+        struct priority_tag<0> {};
+    }
+}
+
 #define CATCH_RECURSION_LEVEL0(...) __VA_ARGS__
 #define CATCH_RECURSION_LEVEL1(...) CATCH_RECURSION_LEVEL0(CATCH_RECURSION_LEVEL0(CATCH_RECURSION_LEVEL0(__VA_ARGS__)))
 #define CATCH_RECURSION_LEVEL2(...) CATCH_RECURSION_LEVEL1(CATCH_RECURSION_LEVEL1(CATCH_RECURSION_LEVEL1(__VA_ARGS__)))
@@ -75,10 +84,10 @@
 #define INTERNAL_CATCH_MAKE_NAMESPACE(name) INTERNAL_CATCH_MAKE_NAMESPACE2(name)
 
 #ifndef CATCH_CONFIG_TRADITIONAL_MSVC_PREPROCESSOR
-#define INTERNAL_CATCH_MAKE_TYPE_LIST2(...) decltype(get_wrapper<INTERNAL_CATCH_REMOVE_PARENS_GEN(__VA_ARGS__)>())
+#define INTERNAL_CATCH_MAKE_TYPE_LIST2(...) decltype(get_wrapper<INTERNAL_CATCH_REMOVE_PARENS_GEN(__VA_ARGS__)>(Catch::Detail::priority_tag<1>{}))
 #define INTERNAL_CATCH_MAKE_TYPE_LIST(...) INTERNAL_CATCH_MAKE_TYPE_LIST2(INTERNAL_CATCH_REMOVE_PARENS(__VA_ARGS__))
 #else
-#define INTERNAL_CATCH_MAKE_TYPE_LIST2(...) INTERNAL_CATCH_EXPAND_VARGS(decltype(get_wrapper<INTERNAL_CATCH_REMOVE_PARENS_GEN(__VA_ARGS__)>()))
+#define INTERNAL_CATCH_MAKE_TYPE_LIST2(...) INTERNAL_CATCH_EXPAND_VARGS(decltype(get_wrapper<INTERNAL_CATCH_REMOVE_PARENS_GEN(__VA_ARGS__)>(Catch::Detail::priority_tag<1>{})))
 #define INTERNAL_CATCH_MAKE_TYPE_LIST(...) INTERNAL_CATCH_EXPAND_VARGS(INTERNAL_CATCH_MAKE_TYPE_LIST2(INTERNAL_CATCH_REMOVE_PARENS(__VA_ARGS__)))
 #endif
 
@@ -101,11 +110,11 @@
 
 #define INTERNAL_CATCH_TYPE_GEN\
     template<typename...> struct TypeList {};\
-    template<typename...Ts>\
-    constexpr auto get_wrapper() noexcept -> TypeList<Ts...> { return {}; }\
+    template<typename... Ts>\
+    constexpr auto get_wrapper(Catch::Detail::priority_tag<1>) noexcept -> TypeList<Ts...> { return {}; }\
     template<template<typename...> class...> struct TemplateTypeList{};\
     template<template<typename...> class...Cs>\
-    constexpr auto get_wrapper() noexcept -> TemplateTypeList<Cs...> { return {}; }\
+    constexpr auto get_wrapper(Catch::Detail::priority_tag<1>) noexcept -> TemplateTypeList<Cs...> { return {}; }\
     template<typename...>\
     struct append;\
     template<typename...>\
@@ -135,10 +144,10 @@
 #define INTERNAL_CATCH_NTTP_1(signature, ...)\
     template<INTERNAL_CATCH_REMOVE_PARENS(signature)> struct Nttp{};\
     template<INTERNAL_CATCH_REMOVE_PARENS(signature)>\
-    constexpr auto get_wrapper() noexcept -> Nttp<__VA_ARGS__> { return {}; } \
+    constexpr auto get_wrapper(Catch::Detail::priority_tag<0>) noexcept -> Nttp<__VA_ARGS__> { return {}; } \
     template<template<INTERNAL_CATCH_REMOVE_PARENS(signature)> class...> struct NttpTemplateTypeList{};\
     template<template<INTERNAL_CATCH_REMOVE_PARENS(signature)> class...Cs>\
-    constexpr auto get_wrapper() noexcept -> NttpTemplateTypeList<Cs...> { return {}; } \
+    constexpr auto get_wrapper(Catch::Detail::priority_tag<0>) noexcept -> NttpTemplateTypeList<Cs...> { return {}; } \
     \
     template< template<INTERNAL_CATCH_REMOVE_PARENS(signature)> class Container, template<INTERNAL_CATCH_REMOVE_PARENS(signature)> class List, INTERNAL_CATCH_REMOVE_PARENS(signature)>\
     struct rewrap<NttpTemplateTypeList<Container>, List<__VA_ARGS__>> { using type = TypeList<Container<__VA_ARGS__>>; };\
@@ -163,13 +172,14 @@
     template<INTERNAL_CATCH_REMOVE_PARENS(signature)>\
     static void TestName()
 
-#define INTERNAL_CATCH_NTTP_REGISTER0(TestFunc, signature)\
-    template<typename Type>\
-    void reg_test(TypeList<Type>, Catch::NameAndTags nameAndTags)\
+#define INTERNAL_CATCH_TYPES_REGISTER(TestFunc)\
+    template<typename... Ts>\
+    void reg_test(TypeList<Ts...>, Catch::NameAndTags nameAndTags)\
     {\
-        Catch::AutoReg( Catch::makeTestInvoker(&TestFunc<Type>), CATCH_INTERNAL_LINEINFO, Catch::StringRef(), nameAndTags);\
+        Catch::AutoReg( Catch::makeTestInvoker(&TestFunc<Ts...>), CATCH_INTERNAL_LINEINFO, Catch::StringRef(), nameAndTags);\
     }
 
+#define INTERNAL_CATCH_NTTP_REGISTER0(TestFunc, signature, ...)
 #define INTERNAL_CATCH_NTTP_REGISTER(TestFunc, signature, ...)\
     template<INTERNAL_CATCH_REMOVE_PARENS(signature)>\
     void reg_test(Nttp<__VA_ARGS__>, Catch::NameAndTags nameAndTags)\
@@ -218,7 +228,7 @@
 #define INTERNAL_CATCH_DEFINE_SIG_TEST_METHOD(TestName, ...) INTERNAL_CATCH_VA_NARGS_IMPL( "dummy", __VA_ARGS__, INTERNAL_CATCH_DEFINE_SIG_TEST_METHOD_X,INTERNAL_CATCH_DEFINE_SIG_TEST_METHOD_X, INTERNAL_CATCH_DEFINE_SIG_TEST_METHOD_X, INTERNAL_CATCH_DEFINE_SIG_TEST_METHOD_X, INTERNAL_CATCH_DEFINE_SIG_TEST_METHOD_X, INTERNAL_CATCH_DEFINE_SIG_TEST_METHOD_X, INTERNAL_CATCH_DEFINE_SIG_TEST_METHOD_X,INTERNAL_CATCH_DEFINE_SIG_TEST_METHOD_X,INTERNAL_CATCH_DEFINE_SIG_TEST_METHOD_X, INTERNAL_CATCH_DEFINE_SIG_TEST_METHOD1, INTERNAL_CATCH_DEFINE_SIG_TEST_METHOD0)(TestName, __VA_ARGS__)
 #define INTERNAL_CATCH_DECLARE_SIG_TEST_METHOD(TestName, ClassName, ...) INTERNAL_CATCH_VA_NARGS_IMPL( "dummy", __VA_ARGS__, INTERNAL_CATCH_DECLARE_SIG_TEST_METHOD_X,INTERNAL_CATCH_DECLARE_SIG_TEST_METHOD_X, INTERNAL_CATCH_DECLARE_SIG_TEST_METHOD_X, INTERNAL_CATCH_DECLARE_SIG_TEST_METHOD_X, INTERNAL_CATCH_DECLARE_SIG_TEST_METHOD_X, INTERNAL_CATCH_DECLARE_SIG_TEST_METHOD_X, INTERNAL_CATCH_DECLARE_SIG_TEST_METHOD_X,INTERNAL_CATCH_DECLARE_SIG_TEST_METHOD_X,INTERNAL_CATCH_DECLARE_SIG_TEST_METHOD_X, INTERNAL_CATCH_DECLARE_SIG_TEST_METHOD1, INTERNAL_CATCH_DECLARE_SIG_TEST_METHOD0)(TestName, ClassName, __VA_ARGS__)
 #define INTERNAL_CATCH_NTTP_REG_METHOD_GEN(TestName, ...) INTERNAL_CATCH_VA_NARGS_IMPL( "dummy", __VA_ARGS__, INTERNAL_CATCH_NTTP_REGISTER_METHOD, INTERNAL_CATCH_NTTP_REGISTER_METHOD, INTERNAL_CATCH_NTTP_REGISTER_METHOD, INTERNAL_CATCH_NTTP_REGISTER_METHOD, INTERNAL_CATCH_NTTP_REGISTER_METHOD, INTERNAL_CATCH_NTTP_REGISTER_METHOD, INTERNAL_CATCH_NTTP_REGISTER_METHOD, INTERNAL_CATCH_NTTP_REGISTER_METHOD, INTERNAL_CATCH_NTTP_REGISTER_METHOD, INTERNAL_CATCH_NTTP_REGISTER_METHOD0, INTERNAL_CATCH_NTTP_REGISTER_METHOD0)(TestName, __VA_ARGS__)
-#define INTERNAL_CATCH_NTTP_REG_GEN(TestFunc, ...) INTERNAL_CATCH_VA_NARGS_IMPL( "dummy", __VA_ARGS__, INTERNAL_CATCH_NTTP_REGISTER, INTERNAL_CATCH_NTTP_REGISTER, INTERNAL_CATCH_NTTP_REGISTER, INTERNAL_CATCH_NTTP_REGISTER, INTERNAL_CATCH_NTTP_REGISTER, INTERNAL_CATCH_NTTP_REGISTER, INTERNAL_CATCH_NTTP_REGISTER, INTERNAL_CATCH_NTTP_REGISTER, INTERNAL_CATCH_NTTP_REGISTER, INTERNAL_CATCH_NTTP_REGISTER0, INTERNAL_CATCH_NTTP_REGISTER0)(TestFunc, __VA_ARGS__)
+#define INTERNAL_CATCH_NTTP_REG_GEN(TestFunc, ...) INTERNAL_CATCH_TYPES_REGISTER(TestFunc) INTERNAL_CATCH_VA_NARGS_IMPL( "dummy", __VA_ARGS__, INTERNAL_CATCH_NTTP_REGISTER, INTERNAL_CATCH_NTTP_REGISTER, INTERNAL_CATCH_NTTP_REGISTER, INTERNAL_CATCH_NTTP_REGISTER, INTERNAL_CATCH_NTTP_REGISTER, INTERNAL_CATCH_NTTP_REGISTER, INTERNAL_CATCH_NTTP_REGISTER, INTERNAL_CATCH_NTTP_REGISTER, INTERNAL_CATCH_NTTP_REGISTER, INTERNAL_CATCH_NTTP_REGISTER0, INTERNAL_CATCH_NTTP_REGISTER0)(TestFunc, __VA_ARGS__)
 #define INTERNAL_CATCH_DEFINE_SIG_TEST(TestName, ...) INTERNAL_CATCH_VA_NARGS_IMPL( "dummy", __VA_ARGS__, INTERNAL_CATCH_DEFINE_SIG_TEST_X, INTERNAL_CATCH_DEFINE_SIG_TEST_X, INTERNAL_CATCH_DEFINE_SIG_TEST_X, INTERNAL_CATCH_DEFINE_SIG_TEST_X, INTERNAL_CATCH_DEFINE_SIG_TEST_X, INTERNAL_CATCH_DEFINE_SIG_TEST_X, INTERNAL_CATCH_DEFINE_SIG_TEST_X, INTERNAL_CATCH_DEFINE_SIG_TEST_X,INTERNAL_CATCH_DEFINE_SIG_TEST_X,INTERNAL_CATCH_DEFINE_SIG_TEST1, INTERNAL_CATCH_DEFINE_SIG_TEST0)(TestName, __VA_ARGS__)
 #define INTERNAL_CATCH_DECLARE_SIG_TEST(TestName, ...) INTERNAL_CATCH_VA_NARGS_IMPL( "dummy", __VA_ARGS__, INTERNAL_CATCH_DECLARE_SIG_TEST_X,INTERNAL_CATCH_DECLARE_SIG_TEST_X, INTERNAL_CATCH_DECLARE_SIG_TEST_X, INTERNAL_CATCH_DECLARE_SIG_TEST_X, INTERNAL_CATCH_DECLARE_SIG_TEST_X, INTERNAL_CATCH_DECLARE_SIG_TEST_X, INTERNAL_CATCH_DEFINE_SIG_TEST_X,INTERNAL_CATCH_DECLARE_SIG_TEST_X,INTERNAL_CATCH_DECLARE_SIG_TEST_X, INTERNAL_CATCH_DECLARE_SIG_TEST1, INTERNAL_CATCH_DECLARE_SIG_TEST0)(TestName, __VA_ARGS__)
 #define INTERNAL_CATCH_REMOVE_PARENS_GEN(...) INTERNAL_CATCH_VA_NARGS_IMPL(__VA_ARGS__, INTERNAL_CATCH_REMOVE_PARENS_11_ARG,INTERNAL_CATCH_REMOVE_PARENS_10_ARG,INTERNAL_CATCH_REMOVE_PARENS_9_ARG,INTERNAL_CATCH_REMOVE_PARENS_8_ARG,INTERNAL_CATCH_REMOVE_PARENS_7_ARG,INTERNAL_CATCH_REMOVE_PARENS_6_ARG,INTERNAL_CATCH_REMOVE_PARENS_5_ARG,INTERNAL_CATCH_REMOVE_PARENS_4_ARG,INTERNAL_CATCH_REMOVE_PARENS_3_ARG,INTERNAL_CATCH_REMOVE_PARENS_2_ARG,INTERNAL_CATCH_REMOVE_PARENS_1_ARG)(__VA_ARGS__)
@@ -228,7 +238,7 @@
 #define INTERNAL_CATCH_DEFINE_SIG_TEST_METHOD(TestName, ...) INTERNAL_CATCH_EXPAND_VARGS(INTERNAL_CATCH_VA_NARGS_IMPL( "dummy", __VA_ARGS__, INTERNAL_CATCH_DEFINE_SIG_TEST_METHOD_X,INTERNAL_CATCH_DEFINE_SIG_TEST_METHOD_X, INTERNAL_CATCH_DEFINE_SIG_TEST_METHOD_X, INTERNAL_CATCH_DEFINE_SIG_TEST_METHOD_X, INTERNAL_CATCH_DEFINE_SIG_TEST_METHOD_X, INTERNAL_CATCH_DEFINE_SIG_TEST_METHOD_X, INTERNAL_CATCH_DEFINE_SIG_TEST_METHOD_X,INTERNAL_CATCH_DEFINE_SIG_TEST_METHOD_X,INTERNAL_CATCH_DEFINE_SIG_TEST_METHOD_X, INTERNAL_CATCH_DEFINE_SIG_TEST_METHOD1, INTERNAL_CATCH_DEFINE_SIG_TEST_METHOD0)(TestName, __VA_ARGS__))
 #define INTERNAL_CATCH_DECLARE_SIG_TEST_METHOD(TestName, ClassName, ...) INTERNAL_CATCH_EXPAND_VARGS(INTERNAL_CATCH_VA_NARGS_IMPL( "dummy", __VA_ARGS__, INTERNAL_CATCH_DECLARE_SIG_TEST_METHOD_X,INTERNAL_CATCH_DECLARE_SIG_TEST_METHOD_X, INTERNAL_CATCH_DECLARE_SIG_TEST_METHOD_X, INTERNAL_CATCH_DECLARE_SIG_TEST_METHOD_X, INTERNAL_CATCH_DECLARE_SIG_TEST_METHOD_X, INTERNAL_CATCH_DECLARE_SIG_TEST_METHOD_X, INTERNAL_CATCH_DECLARE_SIG_TEST_METHOD_X,INTERNAL_CATCH_DECLARE_SIG_TEST_METHOD_X,INTERNAL_CATCH_DECLARE_SIG_TEST_METHOD_X, INTERNAL_CATCH_DECLARE_SIG_TEST_METHOD1, INTERNAL_CATCH_DECLARE_SIG_TEST_METHOD0)(TestName, ClassName, __VA_ARGS__))
 #define INTERNAL_CATCH_NTTP_REG_METHOD_GEN(TestName, ...) INTERNAL_CATCH_EXPAND_VARGS(INTERNAL_CATCH_VA_NARGS_IMPL( "dummy", __VA_ARGS__, INTERNAL_CATCH_NTTP_REGISTER_METHOD, INTERNAL_CATCH_NTTP_REGISTER_METHOD, INTERNAL_CATCH_NTTP_REGISTER_METHOD, INTERNAL_CATCH_NTTP_REGISTER_METHOD, INTERNAL_CATCH_NTTP_REGISTER_METHOD, INTERNAL_CATCH_NTTP_REGISTER_METHOD, INTERNAL_CATCH_NTTP_REGISTER_METHOD, INTERNAL_CATCH_NTTP_REGISTER_METHOD, INTERNAL_CATCH_NTTP_REGISTER_METHOD, INTERNAL_CATCH_NTTP_REGISTER_METHOD0, INTERNAL_CATCH_NTTP_REGISTER_METHOD0)(TestName, __VA_ARGS__))
-#define INTERNAL_CATCH_NTTP_REG_GEN(TestFunc, ...) INTERNAL_CATCH_EXPAND_VARGS(INTERNAL_CATCH_VA_NARGS_IMPL( "dummy", __VA_ARGS__, INTERNAL_CATCH_NTTP_REGISTER, INTERNAL_CATCH_NTTP_REGISTER, INTERNAL_CATCH_NTTP_REGISTER, INTERNAL_CATCH_NTTP_REGISTER, INTERNAL_CATCH_NTTP_REGISTER, INTERNAL_CATCH_NTTP_REGISTER, INTERNAL_CATCH_NTTP_REGISTER, INTERNAL_CATCH_NTTP_REGISTER, INTERNAL_CATCH_NTTP_REGISTER, INTERNAL_CATCH_NTTP_REGISTER0, INTERNAL_CATCH_NTTP_REGISTER0)(TestFunc, __VA_ARGS__))
+#define INTERNAL_CATCH_NTTP_REG_GEN(TestFunc, ...) INTERNAL_CATCH_TYPES_REGISTER(TestFunc) INTERNAL_CATCH_EXPAND_VARGS(INTERNAL_CATCH_VA_NARGS_IMPL( "dummy", __VA_ARGS__, INTERNAL_CATCH_NTTP_REGISTER, INTERNAL_CATCH_NTTP_REGISTER, INTERNAL_CATCH_NTTP_REGISTER, INTERNAL_CATCH_NTTP_REGISTER, INTERNAL_CATCH_NTTP_REGISTER, INTERNAL_CATCH_NTTP_REGISTER, INTERNAL_CATCH_NTTP_REGISTER, INTERNAL_CATCH_NTTP_REGISTER, INTERNAL_CATCH_NTTP_REGISTER, INTERNAL_CATCH_NTTP_REGISTER0, INTERNAL_CATCH_NTTP_REGISTER0)(TestFunc, __VA_ARGS__))
 #define INTERNAL_CATCH_DEFINE_SIG_TEST(TestName, ...) INTERNAL_CATCH_EXPAND_VARGS(INTERNAL_CATCH_VA_NARGS_IMPL( "dummy", __VA_ARGS__, INTERNAL_CATCH_DEFINE_SIG_TEST_X, INTERNAL_CATCH_DEFINE_SIG_TEST_X, INTERNAL_CATCH_DEFINE_SIG_TEST_X, INTERNAL_CATCH_DEFINE_SIG_TEST_X, INTERNAL_CATCH_DEFINE_SIG_TEST_X, INTERNAL_CATCH_DEFINE_SIG_TEST_X, INTERNAL_CATCH_DEFINE_SIG_TEST_X, INTERNAL_CATCH_DEFINE_SIG_TEST_X,INTERNAL_CATCH_DEFINE_SIG_TEST_X,INTERNAL_CATCH_DEFINE_SIG_TEST1, INTERNAL_CATCH_DEFINE_SIG_TEST0)(TestName, __VA_ARGS__))
 #define INTERNAL_CATCH_DECLARE_SIG_TEST(TestName, ...) INTERNAL_CATCH_EXPAND_VARGS(INTERNAL_CATCH_VA_NARGS_IMPL( "dummy", __VA_ARGS__, INTERNAL_CATCH_DECLARE_SIG_TEST_X,INTERNAL_CATCH_DECLARE_SIG_TEST_X, INTERNAL_CATCH_DECLARE_SIG_TEST_X, INTERNAL_CATCH_DECLARE_SIG_TEST_X, INTERNAL_CATCH_DECLARE_SIG_TEST_X, INTERNAL_CATCH_DECLARE_SIG_TEST_X, INTERNAL_CATCH_DEFINE_SIG_TEST_X,INTERNAL_CATCH_DECLARE_SIG_TEST_X,INTERNAL_CATCH_DECLARE_SIG_TEST_X, INTERNAL_CATCH_DECLARE_SIG_TEST1, INTERNAL_CATCH_DECLARE_SIG_TEST0)(TestName, __VA_ARGS__))
 #define INTERNAL_CATCH_REMOVE_PARENS_GEN(...) INTERNAL_CATCH_EXPAND_VARGS(INTERNAL_CATCH_VA_NARGS_IMPL(__VA_ARGS__, INTERNAL_CATCH_REMOVE_PARENS_11_ARG,INTERNAL_CATCH_REMOVE_PARENS_10_ARG,INTERNAL_CATCH_REMOVE_PARENS_9_ARG,INTERNAL_CATCH_REMOVE_PARENS_8_ARG,INTERNAL_CATCH_REMOVE_PARENS_7_ARG,INTERNAL_CATCH_REMOVE_PARENS_6_ARG,INTERNAL_CATCH_REMOVE_PARENS_5_ARG,INTERNAL_CATCH_REMOVE_PARENS_4_ARG,INTERNAL_CATCH_REMOVE_PARENS_3_ARG,INTERNAL_CATCH_REMOVE_PARENS_2_ARG,INTERNAL_CATCH_REMOVE_PARENS_1_ARG)(__VA_ARGS__))

src/catch2/internal/catch_random_number_generator.cpp

@@ -7,6 +7,12 @@
 // SPDX-License-Identifier: BSL-1.0
 #include <catch2/internal/catch_random_number_generator.hpp>
 
+#if defined( __clang__ )
+#    define CATCH2_CLANG_NO_SANITIZE_INTEGER \
+        __attribute__( ( no_sanitize( "unsigned-integer-overflow" ) ) )
+#else
+#    define CATCH2_CLANG_NO_SANITIZE_INTEGER
+#endif
 namespace Catch {
 
 namespace {
@@ -16,6 +22,7 @@ namespace {
 #pragma warning(disable:4146) // we negate uint32 during the rotate
 #endif
         // Safe rotr implementation thanks to John Regehr
+        CATCH2_CLANG_NO_SANITIZE_INTEGER
         uint32_t rotate_right(uint32_t val, uint32_t count) {
             const uint32_t mask = 31;
             count &= mask;
@@ -49,6 +56,7 @@ namespace {
         }
     }
 
+    CATCH2_CLANG_NO_SANITIZE_INTEGER
     SimplePcg32::result_type SimplePcg32::operator()() {
         // prepare the output value
         const uint32_t xorshifted = static_cast<uint32_t>(((m_state >> 18u) ^ m_state) >> 27u);

src/catch2/internal/catch_reusable_string_stream.cpp

@@ -7,10 +7,12 @@
 // SPDX-License-Identifier: BSL-1.0
 #include <catch2/internal/catch_reusable_string_stream.hpp>
 #include <catch2/internal/catch_singletons.hpp>
+#include <catch2/internal/catch_thread_support.hpp>
 #include <catch2/internal/catch_unique_ptr.hpp>
 
 #include <cstdio>
 #include <sstream>
+#include <tuple>
 #include <vector>
 
 namespace Catch {
@@ -20,34 +22,40 @@ namespace Catch {
         std::vector<Detail::unique_ptr<std::ostringstream>> m_streams;
         std::vector<std::size_t> m_unused;
         std::ostringstream m_referenceStream; // Used for copy state/ flags from
+        Detail::Mutex m_mutex;
 
-        auto add() -> std::size_t {
+        auto add() -> std::pair<std::size_t, std::ostringstream*> {
+            Detail::LockGuard _( m_mutex );
             if( m_unused.empty() ) {
                 m_streams.push_back( Detail::make_unique<std::ostringstream>() );
-                return m_streams.size()-1;
+                return { m_streams.size()-1, m_streams.back().get() };
             }
             else {
                 auto index = m_unused.back();
                 m_unused.pop_back();
-                return index;
+                return { index, m_streams[index].get() };
             }
         }
 
-        void release( std::size_t index ) {
-            m_streams[index]->copyfmt( m_referenceStream ); // Restore initial flags and other state
-            m_unused.push_back(index);
+        void release( std::size_t index, std::ostream* originalPtr ) {
+            assert( originalPtr );
+            originalPtr->copyfmt( m_referenceStream );  // Restore initial flags and other state
+
+            Detail::LockGuard _( m_mutex );
+            assert( originalPtr == m_streams[index].get() && "Mismatch between release index and stream ptr" );
+            m_unused.push_back( index );
         }
     };
 
-    ReusableStringStream::ReusableStringStream()
-    :   m_index( Singleton<StringStreams>::getMutable().add() ),
-        m_oss( Singleton<StringStreams>::getMutable().m_streams[m_index].get() )
-    {}
+    ReusableStringStream::ReusableStringStream() {
+        std::tie( m_index, m_oss ) =
+            Singleton<StringStreams>::getMutable().add();
+    }
 
     ReusableStringStream::~ReusableStringStream() {
         static_cast<std::ostringstream*>( m_oss )->str("");
         m_oss->clear();
-        Singleton<StringStreams>::getMutable().release( m_index );
+        Singleton<StringStreams>::getMutable().release( m_index, m_oss );
     }
 
     std::string ReusableStringStream::str() const {

src/catch2/internal/catch_run_context.cpp

@@ -165,23 +165,64 @@ namespace Catch {
         } // namespace
     }
 
+    namespace Detail {
+        // Assertions are owned by the thread that is executing them.
+        // This allows for lock-free progress in common cases where we
+        // do not need to send the assertion events to the reporter.
+        // This also implies that messages are owned by their respective
+        // threads, and should not be shared across different threads.
+        //
+        // This implies that various pieces of metadata referring to last
+        // assertion result/source location/message handling, etc
+        // should also be thread local. For now we just use naked globals
+        // below, in the future we will want to allocate piece of memory
+        // from heap, to avoid consuming too much thread-local storage.
+
+        // This is used for the "if" part of CHECKED_IF/CHECKED_ELSE
+        static thread_local bool g_lastAssertionPassed = false;
+
+        // This is the source location for last encountered macro. It is
+        // used to provide the users with more precise location of error
+        // when an unexpected exception/fatal error happens.
+        static thread_local SourceLineInfo g_lastKnownLineInfo("DummyLocation", static_cast<size_t>(-1));
+
+        // Should we clear message scopes before sending off the messages to
+        // reporter? Set in `assertionPassedFastPath` to avoid doing the full
+        // clear there for performance reasons.
+        static thread_local bool g_clearMessageScopes = false;
+
+        CATCH_INTERNAL_START_WARNINGS_SUPPRESSION
+        CATCH_INTERNAL_SUPPRESS_GLOBALS_WARNINGS
+        // Actual messages to be provided to the reporter
+        static thread_local std::vector<MessageInfo> g_messages;
+
+        // Owners for the UNSCOPED_X information macro
+        static thread_local std::vector<ScopedMessage> g_messageScopes;
+        CATCH_INTERNAL_STOP_WARNINGS_SUPPRESSION
+
+    } // namespace Detail
+
     RunContext::RunContext(IConfig const* _config, IEventListenerPtr&& reporter)
     :   m_runInfo(_config->name()),
         m_config(_config),
         m_reporter(CATCH_MOVE(reporter)),
-        m_lastAssertionInfo{ StringRef(), SourceLineInfo("",0), StringRef(), ResultDisposition::Normal },
         m_outputRedirect( makeOutputRedirect( m_reporter->getPreferences().shouldRedirectStdOut ) ),
-        m_includeSuccessfulResults( m_config->includeSuccessfulResults() || m_reporter->getPreferences().shouldReportAllAssertions )
+        m_abortAfterXFailedAssertions( m_config->abortAfter() ),
+        m_reportAssertionStarting( m_reporter->getPreferences().shouldReportAllAssertionStarts ),
+        m_includeSuccessfulResults( m_config->includeSuccessfulResults() || m_reporter->getPreferences().shouldReportAllAssertions ),
+        m_shouldDebugBreak( m_config->shouldDebugBreak() )
     {
         getCurrentMutableContext().setResultCapture( this );
         m_reporter->testRunStarting(m_runInfo);
     }
 
     RunContext::~RunContext() {
+        updateTotalsFromAtomics();
         m_reporter->testRunEnded(TestRunStats(m_runInfo, m_totals, aborting()));
     }
 
     Totals RunContext::runTest(TestCaseHandle const& testCase) {
+        updateTotalsFromAtomics();
         const Totals prevTotals = m_totals;
 
         auto const& testInfo = testCase.getTestCaseInfo();
@@ -236,6 +277,7 @@ namespace Catch {
 
             m_reporter->testCasePartialStarting(testInfo, testRuns);
 
+            updateTotalsFromAtomics();
             const auto beforeRunTotals = m_totals;
             runCurrentTest();
             std::string oneRunCout = m_outputRedirect->getStdout();
@@ -244,6 +286,7 @@ namespace Catch {
             redirectedCout += oneRunCout;
             redirectedCerr += oneRunCerr;
 
+            updateTotalsFromAtomics();
             const auto singleRunTotals = m_totals.delta(beforeRunTotals);
             auto statsForOneRun = TestCaseStats(testInfo, singleRunTotals, CATCH_MOVE(oneRunCout), CATCH_MOVE(oneRunCerr), aborting());
             m_reporter->testCasePartialEnded(statsForOneRun, testRuns);
@@ -273,47 +316,54 @@ namespace Catch {
 
 
     void RunContext::assertionEnded(AssertionResult&& result) {
+        Detail::g_lastKnownLineInfo = result.m_info.lineInfo;
         if (result.getResultType() == ResultWas::Ok) {
-            m_totals.assertions.passed++;
-            m_lastAssertionPassed = true;
+            m_atomicAssertionCount.passed++;
+            Detail::g_lastAssertionPassed = true;
         } else if (result.getResultType() == ResultWas::ExplicitSkip) {
-            m_totals.assertions.skipped++;
-            m_lastAssertionPassed = true;
+            m_atomicAssertionCount.skipped++;
+            Detail::g_lastAssertionPassed = true;
         } else if (!result.succeeded()) {
-            m_lastAssertionPassed = false;
+            Detail::g_lastAssertionPassed = false;
             if (result.isOk()) {
             }
-            else if( m_activeTestCase->getTestCaseInfo().okToFail() )
-                m_totals.assertions.failedButOk++;
+            else if( m_activeTestCase->getTestCaseInfo().okToFail() ) // Read from a shared state established before the threads could start, this is fine
+                m_atomicAssertionCount.failedButOk++;
             else
-                m_totals.assertions.failed++;
+                m_atomicAssertionCount.failed++;
         }
         else {
-            m_lastAssertionPassed = true;
+            Detail::g_lastAssertionPassed = true;
         }
 
+        if ( Detail::g_clearMessageScopes ) {
+            Detail::g_messageScopes.clear();
+            Detail::g_clearMessageScopes = false;
+        }
+
+        // From here, we are touching shared state and need mutex.
+        Detail::LockGuard lock( m_assertionMutex );
         {
             auto _ = scopedDeactivate( *m_outputRedirect );
-            m_reporter->assertionEnded( AssertionStats( result, m_messages, m_totals ) );
+            updateTotalsFromAtomics();
+            m_reporter->assertionEnded( AssertionStats( result, Detail::g_messages, m_totals ) );
         }
 
         if ( result.getResultType() != ResultWas::Warning ) {
-            m_messageScopes.clear();
+            Detail::g_messageScopes.clear();
         }
 
         // Reset working state. assertion info will be reset after
         // populateReaction is run if it is needed
         m_lastResult = CATCH_MOVE( result );
     }
-    void RunContext::resetAssertionInfo() {
-        m_lastAssertionInfo.macroName = StringRef();
-        m_lastAssertionInfo.capturedExpression = "{Unknown expression after the reported line}"_sr;
-        m_lastAssertionInfo.resultDisposition = ResultDisposition::Normal;
-    }
 
     void RunContext::notifyAssertionStarted( AssertionInfo const& info ) {
-        auto _ = scopedDeactivate( *m_outputRedirect );
-        m_reporter->assertionStarting( info );
+        if (m_reportAssertionStarting) {
+            Detail::LockGuard lock( m_assertionMutex );
+            auto _ = scopedDeactivate( *m_outputRedirect );
+            m_reporter->assertionStarting( info );
+        }
     }
 
     bool RunContext::sectionStarted( StringRef sectionName,
@@ -329,13 +379,14 @@ namespace Catch {
         m_activeSections.push_back(&sectionTracker);
 
         SectionInfo sectionInfo( sectionLineInfo, static_cast<std::string>(sectionName) );
-        m_lastAssertionInfo.lineInfo = sectionInfo.lineInfo;
+        Detail::g_lastKnownLineInfo = sectionLineInfo;
 
         {
             auto _ = scopedDeactivate( *m_outputRedirect );
             m_reporter->sectionStarting( sectionInfo );
         }
 
+        updateTotalsFromAtomics();
         assertions = m_totals.assertions;
 
         return true;
@@ -343,12 +394,11 @@ namespace Catch {
     IGeneratorTracker*
     RunContext::acquireGeneratorTracker( StringRef generatorName,
                                          SourceLineInfo const& lineInfo ) {
-        using namespace Generators;
-        GeneratorTracker* tracker = GeneratorTracker::acquire(
+        auto* tracker = Generators::GeneratorTracker::acquire(
             m_trackerContext,
             TestCaseTracking::NameAndLocationRef(
                  generatorName, lineInfo ) );
-        m_lastAssertionInfo.lineInfo = lineInfo;
+        Detail::g_lastKnownLineInfo = lineInfo;
         return tracker;
     }
 
@@ -380,12 +430,13 @@ namespace Catch {
             return false;
         if (m_trackerContext.currentTracker().hasChildren())
             return false;
-        m_totals.assertions.failed++;
+        m_atomicAssertionCount.failed++;
         assertions.failed++;
         return true;
     }
 
     void RunContext::sectionEnded(SectionEndInfo&& endInfo) {
+        updateTotalsFromAtomics();
         Counts assertions = m_totals.assertions - endInfo.prevAssertions;
         bool missingAssertions = testForMissingAssertions(assertions);
 
@@ -402,9 +453,6 @@ namespace Catch {
                               endInfo.durationInSeconds,
                               missingAssertions ) );
         }
-
-        m_messages.clear();
-        m_messageScopes.clear();
     }
 
     void RunContext::sectionEndedEarly(SectionEndInfo&& endInfo) {
@@ -435,18 +483,6 @@ namespace Catch {
         m_reporter->benchmarkFailed( error );
     }
 
-    void RunContext::pushScopedMessage(MessageInfo const & message) {
-        m_messages.push_back(message);
-    }
-
-    void RunContext::popScopedMessage(MessageInfo const & message) {
-        m_messages.erase(std::remove(m_messages.begin(), m_messages.end(), message), m_messages.end());
-    }
-
-    void RunContext::emplaceUnscopedMessage( MessageBuilder&& builder ) {
-        m_messageScopes.emplace_back( CATCH_MOVE(builder) );
-    }
-
     std::string RunContext::getCurrentTestName() const {
         return m_activeTestCase
             ? m_activeTestCase->getTestCaseInfo().name
@@ -454,6 +490,18 @@ namespace Catch {
     }
 
     const AssertionResult * RunContext::getLastResult() const {
+        // m_lastResult is updated inside the assertion slow-path, under
+        // a mutex, so the read needs to happen under mutex as well.
+
+        // TBD: The last result only makes sense if it is a thread-local
+        //      thing, because the answer is different per thread, like
+        //      last line info, whether last assertion passed, and so on.
+        //
+        //      However, the last result was also never updated in the
+        //      assertion fast path, so it was always somewhat broken,
+        //      and since IResultCapture::getLastResult is deprecated,
+        //      we will leave it as is, until it is finally removed.
+        Detail::LockGuard _( m_assertionMutex );
         return &(*m_lastResult);
     }
 
@@ -462,28 +510,44 @@ namespace Catch {
     }
 
     void RunContext::handleFatalErrorCondition( StringRef message ) {
-        // TODO: scoped deactivate here? Just give up and do best effort?
-        //       the deactivation can break things further, OTOH so can the
-        //       capture
-        auto _ = scopedDeactivate( *m_outputRedirect );
+        // We lock only when touching the reporters directly, to avoid
+        // deadlocks when we call into other functions that also want
+        // to lock the mutex before touching reporters.
+        //
+        // This does mean that we allow other threads to run while handling
+        // a fatal error, but this is all a best effort attempt anyway.
+        {
+            Detail::LockGuard lock( m_assertionMutex );
+            // TODO: scoped deactivate here? Just give up and do best effort?
+            //       the deactivation can break things further, OTOH so can the
+            //       capture
+            auto _ = scopedDeactivate( *m_outputRedirect );
 
-        // First notify reporter that bad things happened
-        m_reporter->fatalErrorEncountered( message );
+            // First notify reporter that bad things happened
+            m_reporter->fatalErrorEncountered( message );
+        }
 
         // Don't rebuild the result -- the stringification itself can cause more fatal errors
         // Instead, fake a result data.
         AssertionResultData tempResult( ResultWas::FatalErrorCondition, { false } );
         tempResult.message = static_cast<std::string>(message);
-        AssertionResult result(m_lastAssertionInfo, CATCH_MOVE(tempResult));
+        AssertionResult result( makeDummyAssertionInfo(),
+                                CATCH_MOVE( tempResult ) );
 
         assertionEnded(CATCH_MOVE(result) );
-        resetAssertionInfo();
+
+
+        // At this point we touch sections/test cases from this thread
+        // to try and end them. Technically that is not supported when
+        // using multiple threads, but the worst thing that can happen
+        // is that the process aborts harder :-D
+        Detail::LockGuard lock( m_assertionMutex );
 
         // Best effort cleanup for sections that have not been destructed yet
         // Since this is a fatal error, we have not had and won't have the opportunity to destruct them properly
         while (!m_activeSections.empty()) {
-            auto nl = m_activeSections.back()->nameAndLocation();
-            SectionEndInfo endInfo{ SectionInfo(CATCH_MOVE(nl.location), CATCH_MOVE(nl.name)), {}, 0.0 };
+            auto const& nl = m_activeSections.back()->nameAndLocation();
+            SectionEndInfo endInfo{ SectionInfo(nl.location, nl.name), {}, 0.0 };
             sectionEndedEarly(CATCH_MOVE(endInfo));
         }
         handleUnfinishedSections();
@@ -508,32 +572,44 @@ namespace Catch {
                                   std::string(),
                                   false));
         m_totals.testCases.failed++;
+        updateTotalsFromAtomics();
         m_reporter->testRunEnded(TestRunStats(m_runInfo, m_totals, false));
     }
 
     bool RunContext::lastAssertionPassed() {
-         return m_lastAssertionPassed;
+        return Detail::g_lastAssertionPassed;
     }
 
-    void RunContext::assertionPassed() {
-        m_lastAssertionPassed = true;
-        ++m_totals.assertions.passed;
-        resetAssertionInfo();
-        m_messageScopes.clear();
+    void RunContext::assertionPassedFastPath(SourceLineInfo lineInfo) {
+        // We want to save the line info for better experience with unexpected assertions
+        Detail::g_lastKnownLineInfo = lineInfo;
+        ++m_atomicAssertionCount.passed;
+        Detail::g_lastAssertionPassed = true;
+        Detail::g_clearMessageScopes = true;
+    }
+
+    void RunContext::updateTotalsFromAtomics() {
+        m_totals.assertions = Counts{
+            m_atomicAssertionCount.passed,
+            m_atomicAssertionCount.failed,
+            m_atomicAssertionCount.failedButOk,
+            m_atomicAssertionCount.skipped,
+        };
     }
 
     bool RunContext::aborting() const {
-        return m_totals.assertions.failed >= static_cast<std::size_t>(m_config->abortAfter());
+        return m_atomicAssertionCount.failed >= m_abortAfterXFailedAssertions;
     }
 
     void RunContext::runCurrentTest() {
         auto const& testCaseInfo = m_activeTestCase->getTestCaseInfo();
         SectionInfo testCaseSection(testCaseInfo.lineInfo, testCaseInfo.name);
         m_reporter->sectionStarting(testCaseSection);
+        updateTotalsFromAtomics();
         Counts prevAssertions = m_totals.assertions;
         double duration = 0;
         m_shouldReportUnexpected = true;
-        m_lastAssertionInfo = { "TEST_CASE"_sr, testCaseInfo.lineInfo, StringRef(), ResultDisposition::Normal };
+        Detail::g_lastKnownLineInfo = testCaseInfo.lineInfo;
 
         Timer timer;
         CATCH_TRY {
@@ -550,18 +626,23 @@ namespace Catch {
         } CATCH_CATCH_ALL {
             // Under CATCH_CONFIG_FAST_COMPILE, unexpected exceptions under REQUIRE assertions
             // are reported without translation at the point of origin.
-            if( m_shouldReportUnexpected ) {
+            if ( m_shouldReportUnexpected ) {
                 AssertionReaction dummyReaction;
-                handleUnexpectedInflightException( m_lastAssertionInfo, translateActiveException(), dummyReaction );
+                handleUnexpectedInflightException( makeDummyAssertionInfo(),
+                                                   translateActiveException(),
+                                                   dummyReaction );
             }
         }
+        updateTotalsFromAtomics();
         Counts assertions = m_totals.assertions - prevAssertions;
         bool missingAssertions = testForMissingAssertions(assertions);
 
         m_testCaseTracker->close();
         handleUnfinishedSections();
-        m_messages.clear();
-        m_messageScopes.clear();
+        Detail::g_messageScopes.clear();
+        // TBD: At this point, m_messages should be empty. Do we want to
+        //      assert that this is true, or keep the defensive clear call?
+        Detail::g_messages.clear();
 
         SectionStats testCaseSectionStats(CATCH_MOVE(testCaseSection), assertions, duration, missingAssertions);
         m_reporter->sectionEnded(testCaseSectionStats);
@@ -602,7 +683,7 @@ namespace Catch {
 
         if( result ) {
             if (!m_includeSuccessfulResults) {
-                assertionPassed();
+                assertionPassedFastPath(info.lineInfo);
             }
             else {
                 reportExpr(info, ResultWas::Ok, &expr, negated);
@@ -610,9 +691,9 @@ namespace Catch {
         }
         else {
             reportExpr(info, ResultWas::ExpressionFailed, &expr, negated );
-            populateReaction( reaction );
+            populateReaction(
+                reaction, info.resultDisposition & ResultDisposition::Normal );
         }
-        resetAssertionInfo();
     }
     void RunContext::reportExpr(
             AssertionInfo const &info,
@@ -620,7 +701,7 @@ namespace Catch {
             ITransientExpression const *expr,
             bool negated ) {
 
-        m_lastAssertionInfo = info;
+        Detail::g_lastKnownLineInfo = info.lineInfo;
         AssertionResultData data( resultType, LazyExpression( negated ) );
 
         AssertionResult assertionResult{ info, CATCH_MOVE( data ) };
@@ -635,24 +716,25 @@ namespace Catch {
             std::string&& message,
             AssertionReaction& reaction
     ) {
-        m_lastAssertionInfo = info;
+        Detail::g_lastKnownLineInfo = info.lineInfo;
 
         AssertionResultData data( resultType, LazyExpression( false ) );
         data.message = CATCH_MOVE( message );
-        AssertionResult assertionResult{ m_lastAssertionInfo,
+        AssertionResult assertionResult{ info,
                                          CATCH_MOVE( data ) };
 
         const auto isOk = assertionResult.isOk();
         assertionEnded( CATCH_MOVE(assertionResult) );
         if ( !isOk ) {
-            populateReaction( reaction );
+            populateReaction(
+                reaction, info.resultDisposition & ResultDisposition::Normal );
         } else if ( resultType == ResultWas::ExplicitSkip ) {
             // TODO: Need to handle this explicitly, as ExplicitSkip is
             // considered "OK"
             reaction.shouldSkip = true;
         }
-        resetAssertionInfo();
     }
+
     void RunContext::handleUnexpectedExceptionNotThrown(
             AssertionInfo const& info,
             AssertionReaction& reaction
@@ -665,55 +747,88 @@ namespace Catch {
             std::string&& message,
             AssertionReaction& reaction
     ) {
-        m_lastAssertionInfo = info;
+        Detail::g_lastKnownLineInfo = info.lineInfo;
 
         AssertionResultData data( ResultWas::ThrewException, LazyExpression( false ) );
         data.message = CATCH_MOVE(message);
         AssertionResult assertionResult{ info, CATCH_MOVE(data) };
         assertionEnded( CATCH_MOVE(assertionResult) );
-        populateReaction( reaction );
-        resetAssertionInfo();
+        populateReaction( reaction,
+                          info.resultDisposition & ResultDisposition::Normal );
     }
 
-    void RunContext::populateReaction( AssertionReaction& reaction ) {
-        reaction.shouldDebugBreak = m_config->shouldDebugBreak();
-        reaction.shouldThrow = aborting() || (m_lastAssertionInfo.resultDisposition & ResultDisposition::Normal);
+    void RunContext::populateReaction( AssertionReaction& reaction,
+                                       bool has_normal_disposition ) {
+        reaction.shouldDebugBreak = m_shouldDebugBreak;
+        reaction.shouldThrow = aborting() || has_normal_disposition;
+    }
+
+    AssertionInfo RunContext::makeDummyAssertionInfo() {
+        const bool testCaseJustStarted =
+            Detail::g_lastKnownLineInfo ==
+            m_activeTestCase->getTestCaseInfo().lineInfo;
+
+        return AssertionInfo{
+            testCaseJustStarted ? "TEST_CASE"_sr : StringRef(),
+            Detail::g_lastKnownLineInfo,
+            testCaseJustStarted ? StringRef() : "{Unknown expression after the reported line}"_sr,
+            ResultDisposition::Normal
+        };
     }
 
     void RunContext::handleIncomplete(
             AssertionInfo const& info
     ) {
         using namespace std::string_literals;
-        m_lastAssertionInfo = info;
+        Detail::g_lastKnownLineInfo = info.lineInfo;
 
         AssertionResultData data( ResultWas::ThrewException, LazyExpression( false ) );
         data.message = "Exception translation was disabled by CATCH_CONFIG_FAST_COMPILE"s;
         AssertionResult assertionResult{ info, CATCH_MOVE( data ) };
         assertionEnded( CATCH_MOVE(assertionResult) );
-        resetAssertionInfo();
     }
+
     void RunContext::handleNonExpr(
             AssertionInfo const &info,
             ResultWas::OfType resultType,
             AssertionReaction &reaction
     ) {
-        m_lastAssertionInfo = info;
-
         AssertionResultData data( resultType, LazyExpression( false ) );
         AssertionResult assertionResult{ info, CATCH_MOVE( data ) };
 
         const auto isOk = assertionResult.isOk();
+        if ( isOk && !m_includeSuccessfulResults ) {
+            assertionPassedFastPath( info.lineInfo );
+            return;
+        }
+
         assertionEnded( CATCH_MOVE(assertionResult) );
-        if ( !isOk ) { populateReaction( reaction ); }
-        resetAssertionInfo();
+        if ( !isOk ) {
+            populateReaction(
+                reaction, info.resultDisposition & ResultDisposition::Normal );
+        }
     }
 
+    void IResultCapture::pushScopedMessage( MessageInfo&& message ) {
+        Detail::g_messages.push_back( CATCH_MOVE( message ) );
+    }
 
-    IResultCapture& getResultCapture() {
-        if (auto* capture = getCurrentContext().getResultCapture())
-            return *capture;
-        else
-            CATCH_INTERNAL_ERROR("No result capture instance");
+    void IResultCapture::popScopedMessage( unsigned int messageId ) {
+        // Note: On average, it would probably be better to look for the message
+        //       backwards. However, we do not expect to have to deal with more
+        //       messages than low single digits, so the optimization is tiny,
+        //       and we would have to hand-write the loop to avoid terrible
+        //       codegen of reverse iterators in debug mode.
+        Detail::g_messages.erase( std::find_if( Detail::g_messages.begin(),
+                                                Detail::g_messages.end(),
+                                                [=]( MessageInfo const& msg ) {
+                                                    return msg.sequence ==
+                                                           messageId;
+                                                } ) );
+    }
+
+    void IResultCapture::emplaceUnscopedMessage( MessageBuilder&& builder ) {
+        Detail::g_messageScopes.emplace_back( CATCH_MOVE( builder ) );
     }
 
     void seedRng(IConfig const& config) {

src/catch2/internal/catch_run_context.hpp

@@ -10,7 +10,7 @@
 
 #include <catch2/interfaces/catch_interfaces_capture.hpp>
 #include <catch2/internal/catch_test_registry.hpp>
-#include <catch2/internal/catch_test_run_info.hpp>
+#include <catch2/catch_test_run_info.hpp>
 #include <catch2/internal/catch_fatal_condition_handler.hpp>
 #include <catch2/catch_test_case_info.hpp>
 #include <catch2/catch_message.hpp>
@@ -20,6 +20,7 @@
 #include <catch2/catch_assertion_result.hpp>
 #include <catch2/internal/catch_optional.hpp>
 #include <catch2/internal/catch_move_and_forward.hpp>
+#include <catch2/internal/catch_thread_support.hpp>
 
 #include <string>
 
@@ -93,11 +94,6 @@ namespace Catch {
         void benchmarkEnded( BenchmarkStats<> const& stats ) override;
         void benchmarkFailed( StringRef error ) override;
 
-        void pushScopedMessage( MessageInfo const& message ) override;
-        void popScopedMessage( MessageInfo const& message ) override;
-
-        void emplaceUnscopedMessage( MessageBuilder&& builder ) override;
-
         std::string getCurrentTestName() const override;
 
         const AssertionResult* getLastResult() const override;
@@ -108,18 +104,18 @@ namespace Catch {
 
         bool lastAssertionPassed() override;
 
-        void assertionPassed() override;
-
     public:
         // !TBD We need to do this another way!
         bool aborting() const;
 
     private:
+        void assertionPassedFastPath( SourceLineInfo lineInfo );
+        // Update the non-thread-safe m_totals from the atomic assertion counts.
+        void updateTotalsFromAtomics();
 
         void runCurrentTest();
         void invokeActiveTestCase();
 
-        void resetAssertionInfo();
         bool testForMissingAssertions( Counts& assertions );
 
         void assertionEnded( AssertionResult&& result );
@@ -129,31 +125,39 @@ namespace Catch {
                     ITransientExpression const *expr,
                     bool negated );
 
-        void populateReaction( AssertionReaction& reaction );
+        void populateReaction( AssertionReaction& reaction, bool has_normal_disposition );
+
+        // Creates dummy info for unexpected exceptions/fatal errors,
+        // where we do not have the access to one, but we still need
+        // to send one to the reporters.
+        AssertionInfo makeDummyAssertionInfo();
 
     private:
 
         void handleUnfinishedSections();
-
+        mutable Detail::Mutex m_assertionMutex;
         TestRunInfo m_runInfo;
         TestCaseHandle const* m_activeTestCase = nullptr;
         ITracker* m_testCaseTracker = nullptr;
         Optional<AssertionResult> m_lastResult;
-
         IConfig const* m_config;
         Totals m_totals;
+        Detail::AtomicCounts m_atomicAssertionCount;
         IEventListenerPtr m_reporter;
-        std::vector<MessageInfo> m_messages;
-        std::vector<ScopedMessage> m_messageScopes; /* Keeps owners of so-called unscoped messages. */
-        AssertionInfo m_lastAssertionInfo;
         std::vector<SectionEndInfo> m_unfinishedSections;
         std::vector<ITracker*> m_activeSections;
         TrackerContext m_trackerContext;
         Detail::unique_ptr<OutputRedirect> m_outputRedirect;
         FatalConditionHandler m_fatalConditionhandler;
-        bool m_lastAssertionPassed = false;
+        // Caches m_config->abortAfter() to avoid vptr calls/allow inlining
+        size_t m_abortAfterXFailedAssertions;
         bool m_shouldReportUnexpected = true;
+        // Caches whether `assertionStarting` events should be sent to the reporter.
+        bool m_reportAssertionStarting;
+        // Caches whether `assertionEnded` events for successful assertions should be sent to the reporter
         bool m_includeSuccessfulResults;
+        // Caches m_config->shouldDebugBreak() to avoid vptr calls/allow inlining
+        bool m_shouldDebugBreak;
     };
 
     void seedRng(IConfig const& config);

src/catch2/internal/catch_string_manip.hpp

@@ -8,6 +8,7 @@
 #ifndef CATCH_STRING_MANIP_HPP_INCLUDED
 #define CATCH_STRING_MANIP_HPP_INCLUDED
 
+#include <catch2/internal/catch_lifetimebound.hpp>
 #include <catch2/internal/catch_stringref.hpp>
 
 #include <cstdint>
@@ -28,10 +29,10 @@ namespace Catch {
     //! Returns a new string without whitespace at the start/end
     std::string trim( std::string const& str );
     //! Returns a substring of the original ref without whitespace. Beware lifetimes!
-    StringRef trim(StringRef ref);
+    StringRef trim( StringRef ref CATCH_ATTR_LIFETIMEBOUND );
 
     // !!! Be aware, returns refs into original string - make sure original string outlives them
-    std::vector<StringRef> splitStringRef( StringRef str, char delimiter );
+    std::vector<StringRef> splitStringRef( StringRef str CATCH_ATTR_LIFETIMEBOUND, char delimiter );
     bool replaceInPlace( std::string& str, std::string const& replaceThis, std::string const& withThis );
 
     /**
@@ -49,7 +50,7 @@ namespace Catch {
         StringRef m_label;
 
     public:
-        constexpr pluralise(std::uint64_t count, StringRef label):
+        constexpr pluralise(std::uint64_t count, StringRef label CATCH_ATTR_LIFETIMEBOUND):
             m_count(count),
             m_label(label)
         {}

src/catch2/internal/catch_stringref.hpp

@@ -8,11 +8,12 @@
 #ifndef CATCH_STRINGREF_HPP_INCLUDED
 #define CATCH_STRINGREF_HPP_INCLUDED
 
+#include <catch2/internal/catch_lifetimebound.hpp>
+
 #include <cstddef>
 #include <string>
 #include <iosfwd>
 #include <cassert>
-
 #include <cstring>
 
 namespace Catch {
@@ -36,14 +37,16 @@ namespace Catch {
     public: // construction
         constexpr StringRef() noexcept = default;
 
-        StringRef( char const* rawChars ) noexcept;
+        StringRef( char const* rawChars CATCH_ATTR_LIFETIMEBOUND ) noexcept;
 
-        constexpr StringRef( char const* rawChars, size_type size ) noexcept
+        constexpr StringRef( char const* rawChars CATCH_ATTR_LIFETIMEBOUND,
+                             size_type size ) noexcept
         :   m_start( rawChars ),
             m_size( size )
         {}
 
-        StringRef( std::string const& stdString ) noexcept
+        StringRef(
+            std::string const& stdString CATCH_ATTR_LIFETIMEBOUND ) noexcept
         :   m_start( stdString.c_str() ),
             m_size( stdString.size() )
         {}
@@ -89,7 +92,7 @@ namespace Catch {
         }
 
         // Returns the current start pointer. May not be null-terminated.
-        constexpr char const* data() const noexcept {
+        constexpr char const* data() const noexcept CATCH_ATTR_LIFETIMEBOUND {
             return m_start;
         }
 

src/catch2/internal/catch_template_test_registry.hpp

@@ -135,11 +135,11 @@
                     constexpr char const* tmpl_types[] = {CATCH_REC_LIST(INTERNAL_CATCH_STRINGIZE_WITHOUT_PARENS, INTERNAL_CATCH_REMOVE_PARENS(TmplTypes))};\
                     constexpr char const* types_list[] = {CATCH_REC_LIST(INTERNAL_CATCH_STRINGIZE_WITHOUT_PARENS, INTERNAL_CATCH_REMOVE_PARENS(TypesList))};\
                     constexpr auto num_types = sizeof(types_list) / sizeof(types_list[0]);\
-                    (void)expander{(Catch::AutoReg( Catch::makeTestInvoker( &TestFuncName<Types> ), CATCH_INTERNAL_LINEINFO, Catch::StringRef(), Catch::NameAndTags{ Name " - " + std::string(tmpl_types[index / num_types]) + '<' + std::string(types_list[index % num_types]) + '>', Tags } ), index++)... };/* NOLINT */\
+                    (void)expander{(Catch::AutoReg( Catch::makeTestInvoker( &TestFuncName<Types> ), CATCH_INTERNAL_LINEINFO, Catch::StringRef(), Catch::NameAndTags{ Name " - " + std::string(tmpl_types[index / num_types]) + '<' + types_list[index % num_types] + '>', Tags } ), index++)... };/* NOLINT */\
                 }                                                     \
             };                                                        \
-            static int INTERNAL_CATCH_UNIQUE_NAME( globalRegistrar ) = [](){ \
-                using TestInit = typename create<TestName, decltype(get_wrapper<INTERNAL_CATCH_REMOVE_PARENS(TmplTypes)>()), TypeList<INTERNAL_CATCH_MAKE_TYPE_LISTS_FROM_TYPES(INTERNAL_CATCH_REMOVE_PARENS(TypesList))>>::type; \
+            static const int INTERNAL_CATCH_UNIQUE_NAME( globalRegistrar ) = [](){ \
+                using TestInit = typename create<TestName, decltype(get_wrapper<INTERNAL_CATCH_REMOVE_PARENS(TmplTypes)>(Catch::Detail::priority_tag<1>{})), TypeList<INTERNAL_CATCH_MAKE_TYPE_LISTS_FROM_TYPES(INTERNAL_CATCH_REMOVE_PARENS(TypesList))>>::type; \
                 TestInit t;                                           \
                 t.reg_tests();                                        \
                 return 0;                                             \
@@ -184,7 +184,7 @@
                 (void)expander{(Catch::AutoReg( Catch::makeTestInvoker( &TestFunc<Types> ), CATCH_INTERNAL_LINEINFO, Catch::StringRef(), Catch::NameAndTags{ Name " - " INTERNAL_CATCH_STRINGIZE(TmplList) " - " + std::to_string(index), Tags } ), index++)... };/* NOLINT */\
             }                                                     \
         };\
-        static int INTERNAL_CATCH_UNIQUE_NAME( globalRegistrar ) = [](){ \
+        static const int INTERNAL_CATCH_UNIQUE_NAME( globalRegistrar ) = [](){ \
                 using TestInit = typename convert<TestName, TmplList>::type; \
                 TestInit t;                                           \
                 t.reg_tests();                                        \
@@ -220,7 +220,7 @@
                     (void)expander{(reg_test(Types{}, #ClassName, Catch::NameAndTags{ Name " - " + std::string(tmpl_types[index]), Tags } ), index++)... };/* NOLINT */ \
                 }\
             };\
-            static int INTERNAL_CATCH_UNIQUE_NAME( globalRegistrar ) = [](){\
+            static const int INTERNAL_CATCH_UNIQUE_NAME( globalRegistrar ) = [](){\
                 TestNameClass<INTERNAL_CATCH_MAKE_TYPE_LISTS_FROM_TYPES(__VA_ARGS__)>();\
                 return 0;\
         }();\
@@ -267,11 +267,11 @@
                     constexpr char const* tmpl_types[] = {CATCH_REC_LIST(INTERNAL_CATCH_STRINGIZE_WITHOUT_PARENS, INTERNAL_CATCH_REMOVE_PARENS(TmplTypes))};\
                     constexpr char const* types_list[] = {CATCH_REC_LIST(INTERNAL_CATCH_STRINGIZE_WITHOUT_PARENS, INTERNAL_CATCH_REMOVE_PARENS(TypesList))};\
                     constexpr auto num_types = sizeof(types_list) / sizeof(types_list[0]);\
-                    (void)expander{(Catch::AutoReg( Catch::makeTestInvoker( &TestName<Types>::test ), CATCH_INTERNAL_LINEINFO, #ClassName, Catch::NameAndTags{ Name " - " + std::string(tmpl_types[index / num_types]) + '<' + std::string(types_list[index % num_types]) + '>', Tags } ), index++)... };/* NOLINT */ \
+                    (void)expander{(Catch::AutoReg( Catch::makeTestInvoker( &TestName<Types>::test ), CATCH_INTERNAL_LINEINFO, #ClassName, Catch::NameAndTags{ Name " - " + std::string(tmpl_types[index / num_types]) + '<' + types_list[index % num_types] + '>', Tags } ), index++)... };/* NOLINT */ \
                 }\
             };\
-            static int INTERNAL_CATCH_UNIQUE_NAME( globalRegistrar ) = [](){\
-                using TestInit = typename create<TestNameClass, decltype(get_wrapper<INTERNAL_CATCH_REMOVE_PARENS(TmplTypes)>()), TypeList<INTERNAL_CATCH_MAKE_TYPE_LISTS_FROM_TYPES(INTERNAL_CATCH_REMOVE_PARENS(TypesList))>>::type;\
+            static const int INTERNAL_CATCH_UNIQUE_NAME( globalRegistrar ) = [](){\
+                using TestInit = typename create<TestNameClass, decltype(get_wrapper<INTERNAL_CATCH_REMOVE_PARENS(TmplTypes)>(Catch::Detail::priority_tag<1>{})), TypeList<INTERNAL_CATCH_MAKE_TYPE_LISTS_FROM_TYPES(INTERNAL_CATCH_REMOVE_PARENS(TypesList))>>::type;\
                 TestInit t;\
                 t.reg_tests();\
                 return 0;\
@@ -319,7 +319,7 @@
                     (void)expander{(Catch::AutoReg( Catch::makeTestInvoker( &TestName<Types>::test ), CATCH_INTERNAL_LINEINFO, #ClassName##_catch_sr, Catch::NameAndTags{ Name " - " INTERNAL_CATCH_STRINGIZE(TmplList) " - " + std::to_string(index), Tags } ), index++)... };/* NOLINT */ \
                 }\
             };\
-            static int INTERNAL_CATCH_UNIQUE_NAME( globalRegistrar ) = [](){\
+            static const int INTERNAL_CATCH_UNIQUE_NAME( globalRegistrar ) = [](){\
                 using TestInit = typename convert<TestNameClass, TmplList>::type;\
                 TestInit t;\
                 t.reg_tests();\

src/catch2/internal/catch_test_case_tracker.hpp

@@ -8,6 +8,7 @@
 #ifndef CATCH_TEST_CASE_TRACKER_HPP_INCLUDED
 #define CATCH_TEST_CASE_TRACKER_HPP_INCLUDED
 
+#include <catch2/internal/catch_lifetimebound.hpp>
 #include <catch2/internal/catch_source_line_info.hpp>
 #include <catch2/internal/catch_unique_ptr.hpp>
 #include <catch2/internal/catch_stringref.hpp>
@@ -48,7 +49,7 @@ namespace TestCaseTracking {
         StringRef name;
         SourceLineInfo location;
 
-        constexpr NameAndLocationRef( StringRef name_,
+        constexpr NameAndLocationRef( StringRef name_ CATCH_ATTR_LIFETIMEBOUND,
                                       SourceLineInfo location_ ):
             name( name_ ), location( location_ ) {}
 

src/catch2/internal/catch_thread_support.hpp

@@ -0,0 +1,49 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+#ifndef CATCH_THREAD_SUPPORT_HPP_INCLUDED
+#define CATCH_THREAD_SUPPORT_HPP_INCLUDED
+
+#include <catch2/catch_user_config.hpp>
+
+#if defined( CATCH_CONFIG_EXPERIMENTAL_THREAD_SAFE_ASSERTIONS )
+#    include <atomic>
+#    include <mutex>
+#endif
+
+#include <catch2/catch_totals.hpp>
+
+namespace Catch {
+    namespace Detail {
+#if defined( CATCH_CONFIG_EXPERIMENTAL_THREAD_SAFE_ASSERTIONS )
+        using Mutex = std::mutex;
+        using LockGuard = std::lock_guard<std::mutex>;
+        struct AtomicCounts {
+            std::atomic<std::uint64_t> passed = 0;
+            std::atomic<std::uint64_t> failed = 0;
+            std::atomic<std::uint64_t> failedButOk = 0;
+            std::atomic<std::uint64_t> skipped = 0;
+        };
+#else // ^^ Use actual mutex, lock and atomics
+      // vv Dummy implementations for single-thread performance
+
+        struct Mutex {
+            void lock() {}
+            void unlock() {}
+        };
+
+        struct LockGuard {
+            LockGuard( Mutex ) {}
+        };
+
+        using AtomicCounts = Counts;
+#endif
+
+    } // namespace Detail
+} // namespace Catch
+
+#endif // CATCH_THREAD_SUPPORT_HPP_INCLUDED

src/catch2/internal/catch_unique_ptr.hpp

@@ -92,7 +92,7 @@ namespace Detail {
         }
 
         explicit operator bool() const {
-            return m_ptr;
+            return m_ptr != nullptr;
         }
 
         friend void swap(unique_ptr& lhs, unique_ptr& rhs) {