diff options
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index 950c7c8526c2..e1f22548b332 100644 --- a/configure.ac +++ b/configure.ac @@ -6189,6 +6189,23 @@ if test "$perfect_forwarding" = yes; then AC_DEFINE([HAVE_CXX11_PERFECT_FORWARDING]) fi +AC_MSG_CHECKING([whether $CXX supports C++11 constexpr]) +save_CXXFLAGS=$CXXFLAGS +CXXFLAGS="$CXXFLAGS $CXXFLAGS_CXX11" +AC_LANG_PUSH([C++]) +AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ + struct S { + int n_; + constexpr S(int n): n_(n) {} + }; + ]])], [cxx11_constexpr=yes], [cxx11_constexpr=no]) +AC_LANG_POP([C++]) +CXXFLAGS=$save_CXXFLAGS +AC_MSG_RESULT([$cxx11_constexpr]) +if test "$cxx11_constexpr" = yes; then + AC_DEFINE([HAVE_CXX11_CONSTEXPR]) +fi + HAVE_GCC_PRAGMA_OPERATOR= dnl _Pragma support (may require C++11) if test "$GCC" = "yes"; then |