diff options
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index 2f23147b..ebf35190 100644 --- a/configure.ac +++ b/configure.ac @@ -153,6 +153,14 @@ AC_TRY_COMPILE([ AC_MSG_RESULT(no; defined as 64) ) +# Check for __builtin_expect() +AC_MSG_CHECKING([for __builtin_expect()]) +AC_LINK_IFELSE([AC_LANG_PROGRAM(, return __builtin_expect(main != 0, 1))], + [AC_DEFINE(HAVE_BUILTIN_EXPECT, 1, + Define to 1 if compiler supports __builtin_expect) + AC_MSG_RESULT([yes])], + [AC_MSG_RESULT([no])]) + # check for availability of atomic operations RS_ATOMIC_OPERATIONS RS_ATOMIC_OPERATIONS_64BIT |