diff options
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index c5b3a1ea116f..a894323e2881 100644 --- a/configure.ac +++ b/configure.ac @@ -7437,6 +7437,23 @@ AC_COMPILE_IFELSE([AC_LANG_SOURCE([ CXXFLAGS=$save_CXXFLAGS AC_LANG_POP([C++]) +AC_MSG_CHECKING([whether $CXX_BASE supports C++20 std::atomic_ref]) +HAVE_CXX20_ATOMIC_REF= +AC_LANG_PUSH([C++]) +save_CXXFLAGS=$CXXFLAGS +CXXFLAGS="$CXXFLAGS $CXXFLAGS_CXX11" +AC_COMPILE_IFELSE([AC_LANG_SOURCE([ + #include <atomic> + int x; + std::atomic_ref<int> y(x); + ])], [ + HAVE_CXX20_ATOMIC_REF=TRUE + AC_MSG_RESULT([yes]) + ], [AC_MSG_RESULT([no])]) +CXXFLAGS=$save_CXXFLAGS +AC_LANG_POP([C++]) +AC_SUBST([HAVE_CXX20_ATOMIC_REF]) + dnl Supported since GCC 9 and Clang 10 (which each also started to support -Wdeprecated-copy, but dnl which is included in -Wextra anyway): HAVE_WDEPRECATED_COPY_DTOR= |