diff options
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index bc76475962c9..45c19e72b9c0 100644 --- a/configure.ac +++ b/configure.ac @@ -6482,6 +6482,29 @@ if test "$GCC" = yes; then fi AC_SUBST([HAVE_GCC_FNO_SIZED_DEALLOCATION]) +HAVE_CPP_GUARANTEED_COPY_ELISION= +AC_MSG_CHECKING([whether $CXX supports guaranteed copy elision]) +AC_LANG_PUSH([C++]) +save_CXXFLAGS=$CXXFLAGS +CXXFLAGS="$CXXFLAGS $CXXFLAGS_CXX11" +AC_COMPILE_IFELSE([AC_LANG_SOURCE([ + #if !defined __cpp_guaranteed_copy_elision + struct S { + private: + S(S const &); + public: + S copy() const { return *this; } + }; + void f(S & s) { S c(s.copy()); } + #endif + ])], [ + AC_DEFINE([HAVE_CPP_GUARANTEED_COPY_ELISION],[1]) + AC_MSG_RESULT([yes]) + ], [AC_MSG_RESULT([no])]) +CXXFLAGS=$save_CXXFLAGS +AC_LANG_POP([C++]) +AC_SUBST([HAVE_CPP_GUARANTEED_COPY_ELISION]) + dnl =================================================================== dnl system stl sanity tests dnl =================================================================== |