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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 | 6941048b7e55ec85ec257c4f597e7f0d54e1584d (patch) | |
| tree | 35b90141e36142f5ebb5910fc0b08e0018e4486a /third_party/glog/m4/ac_have_builtin_expect.m4 | |
| parent | 7dc094173b641c78a449395cc6f28a5e52b6fe64 (diff) | |
| parent | afe04691aca3f669f517adaeb5bd4a87a481fb4a (diff) | |
merge(3p/glog): Vendor glog from commit 'afe04691' r/863
Diffstat (limited to 'third_party/glog/m4/ac_have_builtin_expect.m4')
| -rw-r--r-- | third_party/glog/m4/ac_have_builtin_expect.m4 | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/third_party/glog/m4/ac_have_builtin_expect.m4 b/third_party/glog/m4/ac_have_builtin_expect.m4 new file mode 100644 index 000000000000..e91b6fd987ed --- /dev/null +++ b/third_party/glog/m4/ac_have_builtin_expect.m4 @@ -0,0 +1,14 @@ +AC_DEFUN([AX_C___BUILTIN_EXPECT], [ + AC_MSG_CHECKING(for __builtin_expect) + AC_CACHE_VAL(ac_cv___builtin_expect, [ + AC_TRY_COMPILE( + [int foo(void) { if (__builtin_expect(0, 0)) return 1; return 0; }], + [], + ac_cv___builtin_expect=yes, + ac_cv___builtin_expect=no + )]) + if test "$ac_cv___builtin_expect" = "yes"; then + AC_DEFINE(HAVE___BUILTIN_EXPECT, 1, [define if your compiler has __builtin_expect]) + fi + AC_MSG_RESULT($ac_cv___builtin_expect) +]) |