Use Azure mirrors of Ubuntu .deb repositories in containers.

This reduces the likelihood of spurious CI failures caused by DDoS filters
being triggered by massive numbers of concurrent CI jobs.

.github/workflows/ci.yml

@@ -1,4 +1,4 @@
-# Copyright 2021-2023 Andrey Semashev
+# Copyright 2021-2025 Andrey Semashev
 #
 # Distributed under the Boost Software License, Version 1.0.
 # (See accompanying file LICENSE_1_0.txt or copy at http://boost.org/LICENSE_1_0.txt)
@@ -85,32 +85,50 @@ jobs:
               - g++-8
           - toolset: gcc-9
             cxxstd: "11,14,17,2a"
-            os: ubuntu-20.04
+            os: ubuntu-latest
+            container: ubuntu:20.04
             install:
               - g++-9
           - toolset: gcc-10
             cxxstd: "11,14,17,20"
-            os: ubuntu-20.04
+            os: ubuntu-latest
+            container: ubuntu:20.04
             install:
               - g++-10
           - toolset: gcc-11
-            cxxstd: "03-gnu,11-gnu,14-gnu,17-gnu,20-gnu,23-gnu"
+            cxxstd: "11-gnu,14-gnu,17-gnu,20-gnu,23-gnu"
             os: ubuntu-22.04
             install:
               - g++-11
           - toolset: gcc-12
-            cxxstd: "03-gnu,11-gnu,14-gnu,17-gnu,20-gnu,23-gnu"
+            cxxstd: "11-gnu,14-gnu,17-gnu,20-gnu,23-gnu"
             os: ubuntu-22.04
             install:
               - g++-12
+          - toolset: gcc-13
+            cxxstd: "11-gnu,14-gnu,17-gnu,20-gnu,23-gnu"
+            os: ubuntu-24.04
+            install:
+              - g++-13
+          - toolset: gcc-14
+            cxxstd: "11-gnu,14-gnu,17-gnu,20-gnu,23-gnu,26-gnu"
+            os: ubuntu-24.04
+            install:
+              - g++-14
+          - toolset: gcc-15
+            cxxstd: "11-gnu,14-gnu,17-gnu,20-gnu,23-gnu,26-gnu"
+            os: ubuntu-latest
+            container: ubuntu:25.04
+            install:
+              - g++-15
           - name: UBSAN
-            toolset: gcc-11
-            cxxstd: "03-gnu,11-gnu,14-gnu,17-gnu,20-gnu,23-gnu"
+            toolset: gcc-13
+            cxxstd: "11-gnu,14-gnu,17-gnu,20-gnu,23-gnu"
             ubsan: 1
             build_variant: debug
-            os: ubuntu-22.04
+            os: ubuntu-24.04
             install:
-              - g++-11
+              - g++-13
 
           # Linux, clang
           - toolset: clang
@@ -189,13 +207,15 @@ jobs:
           - toolset: clang
             compiler: clang++-9
             cxxstd: "11,14,17,2a"
-            os: ubuntu-20.04
+            os: ubuntu-latest
+            container: ubuntu:20.04
             install:
               - clang-9
           - toolset: clang
             compiler: clang++-10
             cxxstd: "11,14,17,20"
-            os: ubuntu-20.04
+            os: ubuntu-latest
+            container: ubuntu:20.04
             install:
               - clang-10
           - toolset: clang
@@ -206,7 +226,7 @@ jobs:
               - clang-11
           - toolset: clang
             compiler: clang++-12
-            cxxstd: "03-gnu,11-gnu,14-gnu,17-gnu,20-gnu,2b-gnu"
+            cxxstd: "11-gnu,14-gnu,17-gnu,20-gnu,2b-gnu"
             os: ubuntu-22.04
             install:
               - clang-12
@@ -214,7 +234,7 @@ jobs:
             gcc_toolchain: 11
           - toolset: clang
             compiler: clang++-13
-            cxxstd: "03-gnu,11-gnu,14-gnu,17-gnu,20-gnu,2b-gnu"
+            cxxstd: "11-gnu,14-gnu,17-gnu,20-gnu,2b-gnu"
             os: ubuntu-22.04
             install:
               - clang-13
@@ -222,7 +242,7 @@ jobs:
             gcc_toolchain: 11
           - toolset: clang
             compiler: clang++-14
-            cxxstd: "03-gnu,11-gnu,14-gnu,17-gnu,20-gnu,2b-gnu"
+            cxxstd: "11-gnu,14-gnu,17-gnu,20-gnu,2b-gnu"
             os: ubuntu-22.04
             install:
               - clang-14
@@ -230,65 +250,81 @@ jobs:
             gcc_toolchain: 11
           - toolset: clang
             compiler: clang++-15
-            cxxstd: "03-gnu,11-gnu,14-gnu,17-gnu,20-gnu,2b-gnu"
+            cxxstd: "11-gnu,14-gnu,17-gnu,20-gnu,2b-gnu"
             os: ubuntu-22.04
             install:
               - clang-15
               - g++-11
             gcc_toolchain: 11
-          - toolset: clang
-            compiler: clang++-15
-            cxxstd: "03-gnu,11-gnu,14-gnu,17-gnu,20-gnu,2b-gnu"
-            os: ubuntu-22.04
-            install:
-              - clang-15
-              - libc++-15-dev
-              - libc++abi-15-dev
-            cxxflags: -stdlib=libc++
-            linkflags: -stdlib=libc++
           - toolset: clang
             compiler: clang++-16
-            cxxstd: "03-gnu,11-gnu,14-gnu,17-gnu,20-gnu,2b-gnu"
-            os: ubuntu-22.04
+            cxxstd: "11-gnu,14-gnu,17-gnu,20-gnu,2b-gnu"
+            os: ubuntu-24.04
             install:
               - clang-16
-            sources:
-              - "deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-16 main"
-            source_keys:
-              - "https://apt.llvm.org/llvm-snapshot.gpg.key"
+              - g++-11
+            gcc_toolchain: 11
           - toolset: clang
-            compiler: clang++-16
-            cxxstd: "03-gnu,11-gnu,14-gnu,17-gnu,20-gnu,2b-gnu"
-            os: ubuntu-22.04
+            compiler: clang++-17
+            cxxstd: "11-gnu,14-gnu,17-gnu,20-gnu,23-gnu"
+            os: ubuntu-24.04
             install:
-              - clang-16
-              - libc++-16-dev
-              - libc++abi-16-dev
-            sources:
-              - "deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-16 main"
-            source_keys:
-              - "https://apt.llvm.org/llvm-snapshot.gpg.key"
+              - clang-17
+              - g++-11
+            gcc_toolchain: 11
+          - toolset: clang
+            compiler: clang++-18
+            cxxstd: "11-gnu,14-gnu,17-gnu,20-gnu,23-gnu,26-gnu"
+            os: ubuntu-24.04
+            install:
+              - clang-18
+              - g++-13
+          - toolset: clang
+            compiler: clang++-19
+            cxxstd: "11-gnu,14-gnu,17-gnu,20-gnu,23-gnu,26-gnu"
+            os: ubuntu-24.04
+            install:
+              - clang-19
+          - toolset: clang
+            compiler: clang++-20
+            cxxstd: "11-gnu,14-gnu,17-gnu,20-gnu,23-gnu,26-gnu"
+            os: ubuntu-latest
+            container: ubuntu:25.04
+            install:
+              - clang-20
+          - toolset: clang
+            compiler: clang++-20
+            cxxstd: "11-gnu,14-gnu,17-gnu,20-gnu,23-gnu,26-gnu"
             cxxflags: -stdlib=libc++
             linkflags: -stdlib=libc++
+            os: ubuntu-latest
+            container: ubuntu:25.04
+            install:
+              - clang-20
+              - libc++-20-dev
+              - libc++abi-20-dev
           - name: UBSAN
             toolset: clang
-            compiler: clang++-15
-            cxxstd: "03-gnu,11-gnu,14-gnu,17-gnu,20-gnu,2b-gnu"
+            compiler: clang++-18
+            cxxstd: "11-gnu,14-gnu,17-gnu,20-gnu,23-gnu,26-gnu"
             cxxflags: -stdlib=libc++
             linkflags: -stdlib=libc++
             ubsan: 1
             build_variant: debug
-            os: ubuntu-22.04
+            os: ubuntu-24.04
             install:
-              - clang-15
-              - libc++-15-dev
-              - libc++abi-15-dev
+              - clang-18
+              - libc++-18-dev
+              - libc++abi-18-dev
 
           - toolset: clang
-            cxxstd: "11,14,17,2a"
-            os: macos-11
+            cxxstd: "11,14,17,20,2b"
+            os: macos-13
+          - toolset: clang
+            cxxstd: "11,14,17,20,2b"
+            os: macos-14
 
-    timeout-minutes: 60
+    timeout-minutes: 15
     runs-on: ${{matrix.os}}
     container: ${{matrix.container}}
 
@@ -305,6 +341,22 @@ jobs:
                 echo "GHA_CONTAINER=${{matrix.container}}" >> $GITHUB_ENV
                 if [ -f "/etc/debian_version" ]
                 then
+                    # Use Azure APT mirrors in containers to avoid HTTP errors due to DDoS filters triggered by lots of CI jobs launching concurrently.
+                    # Note that not all Ubuntu versions support "mirror+file:..." URIs in APT sources, so just use Azure mirrors exclusively.
+                    # Note also that on recent Ubuntu versions DEB822 format is used for source files.
+                    APT_SOURCES=()
+                    if [ -d "/etc/apt/sources.list.d" ]
+                    then
+                        readarray -t APT_SOURCES < <(find "/etc/apt/sources.list.d" -type f -name '*.sources' -print)
+                    fi
+                    if [ -f "/etc/apt/sources.list" ]
+                    then
+                        APT_SOURCES+=("/etc/apt/sources.list")
+                    fi
+                    if [ "${#APT_SOURCES[@]}" -gt 0 ]
+                    then
+                        sed -i -E -e 's!([^ ]+) (http|https)://(archive|security)\.ubuntu\.com/ubuntu[^ ]*(.*)!\1 http://azure.archive.ubuntu.com/ubuntu/\4!' "${APT_SOURCES[@]}"
+                    fi
                     apt-get -o Acquire::Retries=$NET_RETRY_COUNT update
                     if [ "$(apt-cache search "^python-is-python3$" | wc -l)" -ne 0 ]
                     then
@@ -317,8 +369,6 @@ jobs:
             fi
             git config --global pack.threads 0
 
-      - uses: actions/checkout@v3
-
       - name: Install packages
         if: matrix.install
         run: |
@@ -433,11 +483,25 @@ jobs:
             then
                 DEPINST_ARGS+=("--git_args" "--jobs $GIT_FETCH_JOBS")
             fi
+            mkdir -p snapshot
+            cd snapshot
+            echo "Downloading library snapshot: https://github.com/${GITHUB_REPOSITORY}/archive/${GITHUB_SHA}.tar.gz"
+            curl -L --retry "$NET_RETRY_COUNT" -o "${LIBRARY}-${GITHUB_SHA}.tar.gz" "https://github.com/${GITHUB_REPOSITORY}/archive/${GITHUB_SHA}.tar.gz"
+            tar -xf "${LIBRARY}-${GITHUB_SHA}.tar.gz"
+            if [ ! -d "${LIBRARY}-${GITHUB_SHA}" ]
+            then
+                echo "Library snapshot does not contain the library directory ${LIBRARY}-${GITHUB_SHA}:"
+                ls -la
+                exit 1
+            fi
+            rm -f "${LIBRARY}-${GITHUB_SHA}.tar.gz"
             cd ..
             git clone -b "$BOOST_BRANCH" --depth 1 "https://github.com/boostorg/boost.git" "boost-root"
             cd boost-root
-            mkdir -p libs/$LIBRARY
-            cp -r $GITHUB_WORKSPACE/* libs/$LIBRARY
+            mkdir -p libs
+            rm -rf "libs/$LIBRARY"
+            mv -f "../snapshot/${LIBRARY}-${GITHUB_SHA}" "libs/$LIBRARY"
+            rm -rf "../snapshot"
             git submodule update --init tools/boostdep
             DEPINST_ARGS+=("$LIBRARY")
             python tools/boostdep/depinst/depinst.py "${DEPINST_ARGS[@]}"
@@ -459,7 +523,7 @@ jobs:
       - name: Run tests
         if: matrix.cmake_tests == ''
         run: |
-            cd ../boost-root
+            cd boost-root
             B2_ARGS=("-j" "$BUILD_JOBS" "toolset=${{matrix.toolset}}" "cxxstd=${{matrix.cxxstd}}")
             if [ -n "${{matrix.build_variant}}" ]
             then
@@ -486,3 +550,70 @@ jobs:
             fi
             B2_ARGS+=("libs/$LIBRARY/test")
             ./b2 "${B2_ARGS[@]}"
+
+  windows:
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - toolset: msvc-14.3
+            cxxstd: "14,17,20,latest"
+            addrmd: 32,64
+            os: windows-2022
+          - toolset: clang-win
+            cxxstd: "14,17,latest"
+            addrmd: 32,64
+            os: windows-2022
+          - toolset: gcc
+            cxxstd: "11,14,17,20,23"
+            addrmd: 64
+            os: windows-2022
+
+    timeout-minutes: 15
+    runs-on: ${{matrix.os}}
+
+    steps:
+      - name: Setup Boost
+        shell: cmd
+        run: |
+            echo GITHUB_REPOSITORY: %GITHUB_REPOSITORY%
+            for /f %%i in ("%GITHUB_REPOSITORY%") do set LIBRARY=%%~nxi
+            echo LIBRARY: %LIBRARY%
+            echo LIBRARY=%LIBRARY%>>%GITHUB_ENV%
+            echo GITHUB_BASE_REF: %GITHUB_BASE_REF%
+            echo GITHUB_REF: %GITHUB_REF%
+            if "%GITHUB_BASE_REF%" == "" set GITHUB_BASE_REF=%GITHUB_REF%
+            set BOOST_BRANCH=develop
+            for /f %%i in ("%GITHUB_BASE_REF%") do if "%%~nxi" == "master" set BOOST_BRANCH=master
+            echo BOOST_BRANCH: %BOOST_BRANCH%
+            mkdir snapshot
+            cd snapshot
+            echo Downloading library snapshot: https://github.com/%GITHUB_REPOSITORY%/archive/%GITHUB_SHA%.zip
+            curl -L --retry %NET_RETRY_COUNT% -o "%LIBRARY%-%GITHUB_SHA%.zip" "https://github.com/%GITHUB_REPOSITORY%/archive/%GITHUB_SHA%.zip"
+            tar -xf "%LIBRARY%-%GITHUB_SHA%.zip"
+            if not exist "%LIBRARY%-%GITHUB_SHA%\" (
+                echo Library snapshot does not contain the library directory %LIBRARY%-%GITHUB_SHA%:
+                dir
+                exit /b 1
+            )
+            del /f "%LIBRARY%-%GITHUB_SHA%.zip"
+            cd ..
+            git clone -b %BOOST_BRANCH% --depth 1 https://github.com/boostorg/boost.git boost-root
+            cd boost-root
+            if not exist "libs\" mkdir libs
+            if exist "libs\%LIBRARY%\" rmdir /s /q "libs\%LIBRARY%"
+            move /Y "..\snapshot\%LIBRARY%-%GITHUB_SHA%" "libs\%LIBRARY%"
+            rmdir /s /q "..\snapshot"
+            git submodule update --init tools/boostdep
+            python tools/boostdep/depinst/depinst.py --git_args "--jobs %GIT_FETCH_JOBS%" %LIBRARY%
+            cmd /c bootstrap
+            b2 -d0 headers
+
+      - name: Run tests
+        shell: cmd
+        run: |
+            cd boost-root
+            if not "${{matrix.cxxstd}}" == "" set CXXSTD=cxxstd=${{matrix.cxxstd}}
+            if not "${{matrix.addrmd}}" == "" set ADDRMD=address-model=${{matrix.addrmd}}
+            if not "${{matrix.build_variant}}" == "" (set BUILD_VARIANT=variant=${{matrix.build_variant}}) else (set BUILD_VARIANT=variant=%DEFAULT_BUILD_VARIANT%)
+            b2 -j %NUMBER_OF_PROCESSORS% libs/%LIBRARY%/test toolset=${{matrix.toolset}} %CXXSTD% %ADDRMD% %BUILD_VARIANT% embed-manifest-via=linker

CMakeLists.txt

@@ -19,4 +19,5 @@ target_link_libraries(boost_integer
         Boost::core
         Boost::static_assert
         Boost::throw_exception
+        Boost::type_traits
 )

appveyor.yml

@@ -42,10 +42,6 @@ environment:
       CXXSTD: 11,14,1z
       ADDPATH: C:\cygwin64\bin;
       APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
-    - TOOLSET: gcc
-      CXXSTD: 11,14,1z
-      ADDPATH: C:\mingw\bin;
-      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
     - TOOLSET: gcc
       CXXSTD: 11,14,1z
       ADDPATH: C:\mingw-w64\x86_64-6.3.0-posix-seh-rt_v5-rev1\mingw64\bin;

build.jam

@@ -0,0 +1,28 @@
+# Copyright René Ferdinand Rivera Morell 2023-2024
+# Distributed under the Boost Software License, Version 1.0.
+# (See accompanying file LICENSE_1_0.txt or copy at
+# http://www.boost.org/LICENSE_1_0.txt)
+
+require-b2 5.2 ;
+
+constant boost_dependencies :
+    /boost/assert//boost_assert
+    /boost/config//boost_config
+    /boost/core//boost_core
+    /boost/static_assert//boost_static_assert
+    /boost/throw_exception//boost_throw_exception
+    /boost/type_traits//boost_type_traits ;
+
+project /boost/integer
+    : common-requirements
+        <include>include
+    ;
+
+explicit
+    [ alias boost_integer : : : : <library>$(boost_dependencies) ]
+    [ alias all : boost_integer test ]
+    ;
+
+call-if : boost-library integer
+    ;
+

include/boost/integer/common_factor_rt.hpp

@@ -51,19 +51,20 @@ namespace boost {
          //
          // some helper functions which really should be constexpr already, but sadly aren't:
          //
-#ifndef BOOST_NO_CXX14_CONSTEXPR
          template <class T>
-         inline constexpr T constexpr_min(T const& a, T const& b) BOOST_GCD_NOEXCEPT(T)
+         inline BOOST_CONSTEXPR T constexpr_min(T const& a, T const& b) BOOST_GCD_NOEXCEPT(T)
          {
             return a < b ? a : b;
          }
+
+#ifndef BOOST_NO_CXX14_CONSTEXPR
          template <class T>
-         inline constexpr auto constexpr_swap(T&a, T& b) BOOST_GCD_NOEXCEPT(T) -> decltype(a.swap(b))
+         inline constexpr auto constexpr_swap(T& a, T& b) BOOST_GCD_NOEXCEPT(T) -> decltype(a.swap(b))
          {
             return a.swap(b);
          }
          template <class T, class U>
-         inline constexpr void constexpr_swap(T&a, U& b...) BOOST_GCD_NOEXCEPT(T)
+         inline constexpr void constexpr_swap(T& a, U& b, ...) BOOST_GCD_NOEXCEPT(T)
          {
             T t(static_cast<T&&>(a));
             a = static_cast<T&&>(b);
@@ -71,12 +72,7 @@ namespace boost {
          }
 #else
          template <class T>
-         inline T constexpr_min(T const& a, T const& b) BOOST_GCD_NOEXCEPT(T)
-         {
-            return a < b ? a : b;
-         }
-         template <class T>
-         inline void constexpr_swap(T&a, T& b) BOOST_GCD_NOEXCEPT(T)
+         inline void constexpr_swap(T& a, T& b) BOOST_GCD_NOEXCEPT(T)
          {
             using std::swap;
             swap(a, b);

test/Jamfile.v2

@@ -2,10 +2,13 @@
 #~ Distributed under the Boost Software License, Version 1.0.
 #~ (See accompanying file LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt)
 
+require-b2 5.0.1 ;
+import-search /boost/config/checks ;
+import config : requires ;
 import testing ;
-import ../../config/checks/config : requires ;
 
-project : requirements <warnings>all <toolset>gcc:<cxxflags>-Wextra ;
+project : requirements <warnings>all <toolset>gcc:<cxxflags>-Wextra
+    <library>/boost/integer//boost_integer ;
 
 obj has_gmpxx : has_gmpxx.cpp ;
 explicit has_gmpxx ;
@@ -13,18 +16,18 @@ explicit has_gmpxx ;
 test-suite integer
     :
         [ run integer_traits_test.cpp ]
-        [ run integer_test.cpp : : : <toolset>gcc:<cxxflags>-Wno-long-long <toolset>darwin:<cxxflags>-Wno-long-long <toolset>sun:<cxxflags>"-Qoption ccfe -tmpldepth=128" ]
-        [ run integer_mask_test.cpp ]
-        [ run integer_log2_test.cpp ]
-        [ run static_log2_test.cpp ]
-        [ run static_min_max_test.cpp ]
-        [ run extended_euclidean_test.cpp ]
-        [ run mod_inverse_test.cpp ]
+        [ run integer_test.cpp : : : <library>/boost/mpl//boost_mpl <toolset>gcc:<cxxflags>-Wno-long-long <toolset>darwin:<cxxflags>-Wno-long-long <toolset>sun:<cxxflags>"-Qoption ccfe -tmpldepth=128" ]
+        [ run integer_mask_test.cpp : : : <library>/boost/detail//boost_detail ]
+        [ run integer_log2_test.cpp : : : <library>/boost/multiprecision//boost_multiprecision ]
+        [ run static_log2_test.cpp : : : <library>/boost/detail//boost_detail ]
+        [ run static_min_max_test.cpp : : : <library>/boost/detail//boost_detail ]
+        [ run extended_euclidean_test.cpp : : : <library>/boost/multiprecision//boost_multiprecision ]
+        [ run mod_inverse_test.cpp : : : <library>/boost/optional//boost_optional <library>/boost/multiprecision//boost_multiprecision ]
         [ compile integer_traits_include_test.cpp ]
         [ compile integer_include_test.cpp ]
         [ compile integer_mask_include_test.cpp ]
         [ compile static_log2_include_test.cpp ]
-        [ compile static_min_max_include_test.cpp ]
+        [ compile static_min_max_include_test.cpp : <library>/boost/detail//boost_detail ]
         [ compile integer_fwd_include_test.cpp ]
         [ compile gcd_constexpr14_test.cpp ]
         [ compile gcd_noexcept_test.cpp ]
@@ -35,5 +38,5 @@ test-suite integer
         [ compile-fail fail_uint_fast.cpp ]
         [ compile-fail fail_uint_least.cpp ]
         [ compile-fail fail_uint_65.cpp ]
-        [ run common_factor_test.cpp : : : [ check-target-builds has_gmpxx "Checking for gmpxx.h" : <define>BOOST_INTEGER_HAS_GMPXX_H=1 <linkflags>-lgmp <linkflags>-lgmpxx ] ]
+        [ run common_factor_test.cpp : : : <library>/boost/mpl//boost_mpl <library>/boost/random//boost_random <library>/boost/rational//boost_rational <library>/boost/multiprecision//boost_multiprecision [ check-target-builds has_gmpxx "Checking for gmpxx.h" : <define>BOOST_INTEGER_HAS_GMPXX_H=1 <linkflags>-lgmp <linkflags>-lgmpxx ] ]
     ;

test/multiprecision_config.hpp

@@ -1,4 +1,4 @@
-// Copyright (c) 2018 Andrey Semashev
+// Copyright (c) 2018, 2024 Andrey Semashev
 //
 // Use, modification, and distribution is subject to the Boost Software
 // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
@@ -8,25 +8,11 @@
 #define BOOST_INTEGER_TEST_MULTIPRECISION_CONFIG_HPP_INCLUDED_
 
 #include <boost/config.hpp>
-#include <boost/config/workaround.hpp>
 
-#if (defined(BOOST_MSVC) && (BOOST_MSVC < 1500)) || \
-    (defined(__clang_major__) && (__clang_major__ == 3) && (__clang_minor__ < 2)) || \
-    (defined(BOOST_GCC) && defined(BOOST_GCC_CXX11) && BOOST_GCC < 40800)
-#define DISABLE_MP_TESTS
-#endif
-
-// This list of checks matches those in Boost.Multiprecision, boost/multiprecision/detail/number_base.hpp,
-// as it no longer supports C++03 since 2021.
-#if !defined(DISABLE_MP_TESTS) && \
-    (\
-        defined(BOOST_NO_CXX11_RVALUE_REFERENCES) || defined(BOOST_NO_CXX11_TEMPLATE_ALIASES) || defined(BOOST_NO_CXX11_HDR_ARRAY) || defined(BOOST_NO_CXX11_HDR_TYPE_TRAITS)\
-        || defined(BOOST_NO_CXX11_ALLOCATOR) || defined(BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX) || defined(BOOST_NO_CXX11_CONSTEXPR)\
-        || (defined(BOOST_NO_CXX11_EXPLICIT_CONVERSION_OPERATORS) || BOOST_WORKAROUND(__SUNPRO_CC, < 0x5140)) || defined(BOOST_NO_CXX11_REF_QUALIFIERS) || defined(BOOST_NO_CXX11_HDR_FUNCTIONAL)\
-        || defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) || defined(BOOST_NO_CXX11_USER_DEFINED_LITERALS) || defined(BOOST_NO_CXX11_THREAD_LOCAL)\
-        || defined(BOOST_NO_CXX11_DECLTYPE) || defined(BOOST_NO_CXX11_STATIC_ASSERT) || defined(BOOST_NO_CXX11_DEFAULTED_FUNCTIONS)\
-        || defined(BOOST_NO_CXX11_NOEXCEPT) || defined(BOOST_NO_CXX11_REF_QUALIFIERS)\
-    )
+// Boost.Multiprecision requires a number of C++11 features, see boost/multiprecision/detail/check_cpp11_config.hpp.
+// Also, Boost.Multiprecision internally uses Boost.Math, which requires C++14 and a recent enough MSVC, see boost/math/tools/config.hpp.
+#if (BOOST_CXX_VERSION < 201402) || \
+    (defined(_MSC_VER) && (_MSC_VER <= 1900))
 #define DISABLE_MP_TESTS
 #endif