diff options
Diffstat (limited to 'build-aux/m4/ax_cxx_compile_stdcxx.m4')
| -rw-r--r-- | build-aux/m4/ax_cxx_compile_stdcxx.m4 | 48 |
1 files changed, 26 insertions, 22 deletions
diff --git a/build-aux/m4/ax_cxx_compile_stdcxx.m4 b/build-aux/m4/ax_cxx_compile_stdcxx.m4 index 079e17d2a6..2c18e49c56 100644 --- a/build-aux/m4/ax_cxx_compile_stdcxx.m4 +++ b/build-aux/m4/ax_cxx_compile_stdcxx.m4 @@ -9,9 +9,9 @@ # DESCRIPTION # # Check for baseline language coverage in the compiler for the specified -# version of the C++ standard. If necessary, add switches to CXXFLAGS to -# enable support. VERSION may be '11' (for the C++11 standard) or '14' -# (for the C++14 standard). +# version of the C++ standard. If necessary, add switches to CXX and +# CXXCPP to enable support. VERSION may be '11' (for the C++11 standard) +# or '14' (for the C++14 standard). # # The second argument, if specified, indicates whether you insist on an # extended mode (e.g. -std=gnu++11) or a strict conformance mode (e.g. @@ -39,7 +39,7 @@ # and this notice are preserved. This file is offered as-is, without any # warranty. -#serial 1 +#serial 4 dnl This macro is based on the code from the AX_CXX_COMPILE_STDCXX_11 macro dnl (serial version number 13). @@ -74,14 +74,17 @@ AC_DEFUN([AX_CXX_COMPILE_STDCXX], [dnl cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx$1_$switch]) AC_CACHE_CHECK(whether $CXX supports C++$1 features with $switch, $cachevar, - [ac_save_CXXFLAGS="$CXXFLAGS" - CXXFLAGS="$CXXFLAGS $switch" + [ac_save_CXX="$CXX" + CXX="$CXX $switch" AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])], [eval $cachevar=yes], [eval $cachevar=no]) - CXXFLAGS="$ac_save_CXXFLAGS"]) + CXX="$ac_save_CXX"]) if eval test x\$$cachevar = xyes; then - CXXFLAGS="$CXXFLAGS $switch" + CXX="$CXX $switch" + if test -n "$CXXCPP" ; then + CXXCPP="$CXXCPP $switch" + fi ac_success=yes break fi @@ -97,14 +100,17 @@ AC_DEFUN([AX_CXX_COMPILE_STDCXX], [dnl cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx$1_$switch]) AC_CACHE_CHECK(whether $CXX supports C++$1 features with $switch, $cachevar, - [ac_save_CXXFLAGS="$CXXFLAGS" - CXXFLAGS="$CXXFLAGS $switch" + [ac_save_CXX="$CXX" + CXX="$CXX $switch" AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])], [eval $cachevar=yes], [eval $cachevar=no]) - CXXFLAGS="$ac_save_CXXFLAGS"]) + CXX="$ac_save_CXX"]) if eval test x\$$cachevar = xyes; then - CXXFLAGS="$CXXFLAGS $switch" + CXX="$CXX $switch" + if test -n "$CXXCPP" ; then + CXXCPP="$CXXCPP $switch" + fi ac_success=yes break fi @@ -115,18 +121,16 @@ AC_DEFUN([AX_CXX_COMPILE_STDCXX], [dnl if test x$ac_success = xno; then AC_MSG_ERROR([*** A compiler with support for C++$1 language features is required.]) fi + fi + if test x$ac_success = xno; then + HAVE_CXX$1=0 + AC_MSG_NOTICE([No compiler with C++$1 support was found]) else - if test x$ac_success = xno; then - HAVE_CXX$1=0 - AC_MSG_NOTICE([No compiler with C++$1 support was found]) - else - HAVE_CXX$1=1 - AC_DEFINE(HAVE_CXX$1,1, - [define if the compiler supports basic C++$1 syntax]) - fi - - AC_SUBST(HAVE_CXX$1) + HAVE_CXX$1=1 + AC_DEFINE(HAVE_CXX$1,1, + [define if the compiler supports basic C++$1 syntax]) fi + AC_SUBST(HAVE_CXX$1) ]) |