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configure: check for & use C++20 if available

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Moritz Bunkus 2024-04-23 15:33:36 +02:00
parent 240fbe5d33
commit bd91eab115
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GPG Key ID: 74AF00ADF2E32C85
1 changed files with 2 additions and 2 deletions
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ac/c++-features.m4
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@ -1,10 +1,10 @@
AC_DEFUN([AX_CXX_STD_CXX_FLAG],[
AC_CACHE_CHECK([for support for the "-std=c++17" flag], [ax_cv_std_cxx_flag],[
AC_CACHE_CHECK([for support for the "-std=c++20" or "-std=c++17" flag], [ax_cv_std_cxx_flag],[
AC_LANG_PUSH(C++)
CXXFLAGS_SAVED="$CXXFLAGS"
for flag in c++17; do
for flag in c++20 c++17; do
CXXFLAGS="$CXXFLAGS_SAVED -std=$flag"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[true;]])],[ax_cv_std_cxx_flag="-std=$flag"],[ax_cv_std_cxx_flag="undecided"])