Update Travis

Avoid -Wmaybe-uninitialized warnings in gcc (issue #27).

.travis.yml

@@ -4,9 +4,7 @@
 
 language: cpp
 
-sudo: false
-
-dist: trusty
+dist: xenial
 
 branches:
   only:
@@ -24,10 +22,6 @@ matrix:
     - env: BOGUS_JOB=true
 
   include:
-    - os: linux
-      compiler: g++
-      env: TOOLSET=gcc CXXSTD=03,11
-
     - os: linux
       compiler: g++-4.4
       env: TOOLSET=gcc CXXSTD=98,0x
@@ -128,20 +122,28 @@ matrix:
             - ubuntu-toolchain-r-test
 
     - os: linux
-      compiler: g++-7
-      env: UBSAN=1 TOOLSET=gcc CXXSTD=03,11,14,17 UBSAN_OPTIONS=print_stacktrace=1 LINKFLAGS=-fuse-ld=gold
+      dist: bionic
+      compiler: g++-10
+      env: TOOLSET=gcc CXXSTD=03,11,14,17,2a
       addons:
         apt:
           packages:
-            - g++-7
+            - g++-10
           sources:
             - ubuntu-toolchain-r-test
 
     - os: linux
-      compiler: clang++
-      env: TOOLSET=clang CXXSTD=03,11
+      compiler: g++-9
+      env: UBSAN=1 TOOLSET=gcc CXXSTD=03,11,14,17,2a UBSAN_OPTIONS=print_stacktrace=1 LINKFLAGS=-fuse-ld=gold
+      addons:
+        apt:
+          packages:
+            - g++-9
+          sources:
+            - ubuntu-toolchain-r-test
 
     - os: linux
+      dist: trusty
       compiler: /usr/bin/clang++
       env: TOOLSET=clang CXXSTD=03,11
       addons:
@@ -150,6 +152,7 @@ matrix:
             - clang-3.3
 
     - os: linux
+      dist: trusty
       compiler: /usr/bin/clang++
       env: TOOLSET=clang CXXSTD=03,11
       addons:
@@ -164,10 +167,8 @@ matrix:
         apt:
           packages:
             - clang-3.5
-            - libstdc++-4.9-dev
           sources:
             - ubuntu-toolchain-r-test
-            - llvm-toolchain-precise-3.5
 
     - os: linux
       compiler: clang++-3.6
@@ -178,7 +179,6 @@ matrix:
             - clang-3.6
           sources:
             - ubuntu-toolchain-r-test
-            - llvm-toolchain-precise-3.6
 
     - os: linux
       compiler: clang++-3.7
@@ -189,7 +189,6 @@ matrix:
             - clang-3.7
           sources:
             - ubuntu-toolchain-r-test
-            - llvm-toolchain-precise-3.7
 
     - os: linux
       compiler: clang++-3.8
@@ -198,10 +197,8 @@ matrix:
         apt:
           packages:
             - clang-3.8
-            - libstdc++-4.9-dev
           sources:
             - ubuntu-toolchain-r-test
-            - llvm-toolchain-precise-3.8
 
     - os: linux
       compiler: clang++-3.9
@@ -210,10 +207,8 @@ matrix:
         apt:
           packages:
             - clang-3.9
-            - libstdc++-4.9-dev
           sources:
             - ubuntu-toolchain-r-test
-            - llvm-toolchain-precise-3.9
 
     - os: linux
       compiler: clang++-4.0
@@ -224,7 +219,6 @@ matrix:
             - clang-4.0
           sources:
             - ubuntu-toolchain-r-test
-            - llvm-toolchain-trusty-4.0
 
     - os: linux
       compiler: clang++-5.0
@@ -235,7 +229,6 @@ matrix:
             - clang-5.0
           sources:
             - ubuntu-toolchain-r-test
-            - llvm-toolchain-trusty-5.0
 
     - os: linux
       compiler: clang++-6.0
@@ -246,7 +239,6 @@ matrix:
             - clang-6.0
           sources:
             - ubuntu-toolchain-r-test
-            - llvm-toolchain-trusty-6.0
 
     - os: linux
       compiler: clang++-7
@@ -257,7 +249,7 @@ matrix:
             - clang-7
           sources:
             - ubuntu-toolchain-r-test
-            - llvm-toolchain-trusty-7
+            - llvm-toolchain-xenial-7
 
     - os: linux
       compiler: clang++-8
@@ -268,7 +260,33 @@ matrix:
             - clang-8
           sources:
             - ubuntu-toolchain-r-test
-            - llvm-toolchain-trusty-8
+            - llvm-toolchain-xenial-8
+
+    - os: linux
+      dist: xenial
+      compiler: clang++-9
+      env: TOOLSET=clang CXXSTD=03,11,14,17,2a
+      addons:
+        apt:
+          packages:
+            - clang-9
+          sources:
+            - ubuntu-toolchain-r-test
+            - sourceline: 'deb https://apt.llvm.org/xenial/ llvm-toolchain-xenial-9 main'
+              key_url: 'https://apt.llvm.org/llvm-snapshot.gpg.key'
+
+    - os: linux
+      dist: xenial
+      compiler: clang++-10
+      env: TOOLSET=clang CXXSTD=03,11,14,17,2a
+      addons:
+        apt:
+          packages:
+            - clang-10
+          sources:
+            - ubuntu-toolchain-r-test
+            - sourceline: 'deb https://apt.llvm.org/xenial/ llvm-toolchain-xenial-10 main'
+              key_url: 'https://apt.llvm.org/llvm-snapshot.gpg.key'
 
     - os: linux
       compiler: clang++-8
@@ -279,9 +297,10 @@ matrix:
             - clang-8
           sources:
             - ubuntu-toolchain-r-test
-            - llvm-toolchain-trusty-8
+            - llvm-toolchain-xenial-8
 
     - os: linux
+      dist: trusty
       compiler: clang++-libc++
       env: TOOLSET=clang CXXSTD=03,11,14,1z
       addons:
@@ -290,6 +309,7 @@ matrix:
             - libc++-dev
 
     - os: linux
+      dist: trusty
       compiler: clang++-libc++
       env: UBSAN=1 TOOLSET=clang CXXSTD=03,11,14,1z UBSAN_OPTIONS=print_stacktrace=1
       addons:
@@ -301,6 +321,10 @@ matrix:
       compiler: clang++
       env: TOOLSET=clang CXXSTD=03,11,14,1z
 
+    - os: osx
+      compiler: clang++
+      env: UBSAN=1 TOOLSET=clang CXXSTD=03,11,14,1z UBSAN_OPTIONS=print_stacktrace=1
+
 install:
   - BOOST_BRANCH=develop && [ "$TRAVIS_BRANCH" == "master" ] && BOOST_BRANCH=master || true
   - cd ..

appveyor.yml

@@ -23,6 +23,14 @@ environment:
       TOOLSET: msvc-14.1
       CXXSTD: 14,17
       ADDRMD: 32,64
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
+      TOOLSET: clang-win
+      CXXSTD: 14,17
+      ADDRMD: 64
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
+      TOOLSET: msvc-14.2
+      CXXSTD: 14,17
+      ADDRMD: 32,64
     - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
       ADDPATH: C:\cygwin\bin;
       TOOLSET: gcc

include/boost/function/function_template.hpp

@@ -898,11 +898,20 @@ namespace boost {
     {
       if (!f.empty()) {
         this->vtable = f.vtable;
-        if (this->has_trivial_copy_and_destroy())
+        if (this->has_trivial_copy_and_destroy()) {
           // Don't operate on storage directly since union type doesn't relax
           // strict aliasing rules, despite of having member char type.
+#         if defined(BOOST_GCC) && (BOOST_GCC >= 40700)
+#           pragma GCC diagnostic push
+            // This warning is technically correct, but we don't want to pay the price for initializing
+            // just to silence a warning: https://github.com/boostorg/function/issues/27
+#           pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#         endif
           std::memcpy(this->functor.data, f.functor.data, sizeof(boost::detail::function::function_buffer));
-        else
+#         if defined(BOOST_GCC) && (BOOST_GCC >= 40700)
+#           pragma GCC diagnostic pop
+#         endif
+        } else
           get_vtable()->base.manager(f.functor, this->functor,
                                      boost::detail::function::clone_functor_tag);
       }
@@ -987,11 +996,20 @@ namespace boost {
       BOOST_TRY {
         if (!f.empty()) {
           this->vtable = f.vtable;
-          if (this->has_trivial_copy_and_destroy())
+          if (this->has_trivial_copy_and_destroy()) {
             // Don't operate on storage directly since union type doesn't relax
             // strict aliasing rules, despite of having member char type.
+#           if defined(BOOST_GCC) && (BOOST_GCC >= 40700)
+#             pragma GCC diagnostic push
+              // This warning is technically correct, but we don't want to pay the price for initializing
+              // just to silence a warning: https://github.com/boostorg/function/issues/27
+#             pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#           endif
             std::memcpy(this->functor.data, f.functor.data, sizeof(this->functor.data));
-          else
+#           if defined(BOOST_GCC) && (BOOST_GCC >= 40700)
+#             pragma GCC diagnostic pop
+#           endif
+          } else
             get_vtable()->base.manager(f.functor, this->functor,
                                      boost::detail::function::move_functor_tag);
           f.vtable = 0;