diff options
Diffstat (limited to 'm4/using_operator.m4')
| -rw-r--r-- | m4/using_operator.m4 | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/m4/using_operator.m4 b/m4/using_operator.m4 new file mode 100644 index 000000000000..95a9951eb346 --- /dev/null +++ b/m4/using_operator.m4 @@ -0,0 +1,15 @@ +AC_DEFUN([AC_CXX_USING_OPERATOR], + [AC_CACHE_CHECK( + whether compiler supports using ::operator<<, + ac_cv_cxx_using_operator, + [AC_LANG_SAVE + AC_LANG_CPLUSPLUS + AC_TRY_COMPILE([#include <iostream> + std::ostream& operator<<(std::ostream&, struct s);], + [using ::operator<<; return 0;], + ac_cv_cxx_using_operator=1, + ac_cv_cxx_using_operator=0) + AC_LANG_RESTORE]) + if test "$ac_cv_cxx_using_operator" = 1; then + AC_DEFINE(HAVE_USING_OPERATOR, 1, [define if the compiler supports using expression for operator]) + fi]) |