diff options
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/configure.ac b/configure.ac index d97b10fff15b..bfa0d28e5969 100644 --- a/configure.ac +++ b/configure.ac @@ -6802,12 +6802,20 @@ if test "$GCC" = yes; then fi AC_SUBST([HAVE_GCC_FNO_SIZED_DEALLOCATION]) -AC_MSG_CHECKING([whether $CXX_BASE supports C++20 consteval]) +AC_MSG_CHECKING([whether $CXX_BASE supports a working C++20 consteval]) +dnl ...that does not suffer from <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96994> "Missing code +dnl from consteval constructor initializing const variable": AC_LANG_PUSH([C++]) save_CXXFLAGS=$CXXFLAGS CXXFLAGS="$CXXFLAGS $CXXFLAGS_CXX11" -AC_COMPILE_IFELSE([AC_LANG_SOURCE([ - consteval int f() { return 0; } +AC_RUN_IFELSE([AC_LANG_PROGRAM([ + struct S { + consteval S() { i = 1; } + int i = 0; + }; + S const s; + ], [ + return (s.i == 1) ? 0 : 1; ])], [ AC_DEFINE([HAVE_CPP_CONSTEVAL],[1]) AC_MSG_RESULT([yes]) |