diff options
Diffstat (limited to 'acinclude.m4')
| -rw-r--r-- | acinclude.m4 | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/acinclude.m4 b/acinclude.m4 index b2220c3d5e..478ea31761 100644 --- a/acinclude.m4 +++ b/acinclude.m4 @@ -3031,3 +3031,21 @@ AC_DEFUN([PHP_CHECK_STDINT_TYPES], [ ]) AC_DEFINE([PHP_HAVE_STDINT_TYPES], [1], [Checked for stdint types]) ]) + +dnl PHP_CHECK_BUILTIN_EXPECT +AC_DEFUN([PHP_CHECK_BUILTIN_EXPECT], [ + AC_MSG_CHECKING([for __builtin_expect]) + + AC_TRY_LINK(, [ + return __builtin_expect(1,1) ? 1 : 0; + ], [ + have_builtin_expect=1 + AC_MSG_RESULT([yes]) + ], [ + have_builtin_expect=0 + AC_MSG_RESULT([no]) + ]) + + AC_DEFINE([PHP_HAVE_BUILTIN_EXPECT], [$have_builtin_expect], [Whether the compiler supports __builtin_expect]) + +]) |