| dnl builtin_expect is used in module we can't add that in config.h | |
| AC_DEFUN([AX_BUILTIN_EXPECT], | |
| [ | |
| AC_MSG_CHECKING([whether __builtin_expect is understood]) | |
| SAVE_CFLAGS=$CFLAGS | |
| CFLAGS="-Werror $CFLAGS" | |
| AC_TRY_LINK(,[ | |
| int i; | |
| if (__builtin_expect(i, 0)) { } | |
| ], | |
| AC_MSG_RESULT([yes]); EXTRA_CFLAGS_MODULE="$EXTRA_CFLAGS_MODULE -DEXPECT_OK", | |
| AC_MSG_RESULT([no]);) | |
| CFLAGS=$SAVE_CFLAGS | |
| ] | |
| ) |