Squashed 'third_party/google-glog/' content from commit 5d46e1b
Change-Id: I4d7d0b2759aa01069e6990109ae0f5f9897512c4
git-subtree-dir: third_party/google-glog
git-subtree-split: 5d46e1bcfc92bf06a9ca3b3f1c5bb1dc024d9ecd
diff --git a/m4/using_operator.m4 b/m4/using_operator.m4
new file mode 100644
index 0000000..95a9951
--- /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])