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| author | Vincent Ambo <tazjin@google.com> | 2020-05-27T00·26+0100 |
|---|---|---|
| committer | Vincent Ambo <tazjin@google.com> | 2020-05-27T00·26+0100 |
| commit | afe04691aca3f669f517adaeb5bd4a87a481fb4a (patch) | |
| tree | 60ae6c91a3959b2f6486256e26ff126e598d1e5d /m4/using_operator.m4 | |
Squashed 'third_party/glog/' content from commit 9ef754a3023
git-subtree-dir: third_party/glog git-subtree-split: 9ef754a3023e6fd10f20fe53dfca96dd898182e3
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]) |