Bump baseline to C++20
Change-Id: I47c3a3bdbf2b7b85f8f6f91b694625197aab8002
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/155121
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>
diff --git a/configure.ac b/configure.ac
index 0cebc8b..6595593 100644
--- a/configure.ac
+++ b/configure.ac
@@ -7550,18 +7550,18 @@ dnl C++11
dnl ===================================================================
if test -z "${CXXFLAGS_CXX11+x}"; then
AC_MSG_CHECKING([whether $CXX_BASE supports C++17])
AC_MSG_CHECKING([whether $CXX_BASE supports C++20])
if test "$COM" = MSC -a "$COM_IS_CLANG" != TRUE; then
if test "$with_latest_c__" = yes; then
CXXFLAGS_CXX11=-std:c++latest
else
CXXFLAGS_CXX11=-std:c++17
CXXFLAGS_CXX11=-std:c++20
fi
CXXFLAGS_CXX11="$CXXFLAGS_CXX11 -permissive- -Zc:__cplusplus,preprocessor"
elif test "$GCC" = "yes" -o "$COM_IS_CLANG" = TRUE; then
my_flags='-std=c++17 -std=c++1z'
my_flags='-std=c++20 -std=c++2a'
if test "$with_latest_c__" = yes; then
my_flags="-std=c++26 -std=c++2c -std=c++23 -std=c++2b -std=c++20 -std=c++2a $my_flags"
my_flags="-std=c++26 -std=c++2c -std=c++23 -std=c++2b $my_flags"
fi
for flag in $my_flags; do
if test "$COM" = MSC; then
