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build system: test for -std=gnu++14/-std=gnu++11 as well

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For clang using gnu++14/11 results in a dummy type being defined for
__float128. That, in turn, allows compilation with unmodified libstdc++
and clang.
This commit is contained in:
Moritz Bunkus 2015-06-06 09:30:10 +02:00
parent 6af604ae2d
commit fef12cc386
1 changed files with 9 additions and 9 deletions
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18
ac/c++11.m4
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@ -4,17 +4,17 @@ AC_DEFUN([AX_CXX_STD_CXX_FLAG],[
AC_LANG_PUSH(C++)
CXXFLAGS_SAVED="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS_SAVED -std=c++14"
AC_TRY_COMPILE([], [true;], [ax_cv_std_cxx_flag="-std=c++14"], [ax_cv_std_cxx_flag="undecided"])
for flag in gnu++14 c++14 gnu++11 c++11 c++0x; do
CXXFLAGS="$CXXFLAGS_SAVED -std=$flag"
AC_TRY_COMPILE([], [true;], [ax_cv_std_cxx_flag="-std=$flag"], [ax_cv_std_cxx_flag="undecided"])
if test x"$ax_cv_std_cxx_flag" != xundecided ; then
break
fi
done
if test x"$ax_cv_std_cxx_flag" = xundecided ; then
CXXFLAGS="$CXXFLAGS_SAVED -std=c++11"
AC_TRY_COMPILE([], [true;], [ax_cv_std_cxx_flag="-std=c++11"], [ax_cv_std_cxx_flag="undecided"])
fi
if test x"$ax_cv_std_cxx_flag" = xundecided ; then
CXXFLAGS="$CXXFLAGS_SAVED -std=c++0x"
AC_TRY_COMPILE([], [true;], [ax_cv_std_cxx_flag="-std=c++0x"], [ax_cv_std_cxx_flag="no"])
ax_cv_std_cxx_flag="no"
fi
AC_LANG_POP