| Mike Dodd | 8cfa702 | 2010-11-17 11:12:26 -0800 | [diff] [blame] | 1 | dnl builtin_expect is used in module we can't add that in config.h |
| 2 | AC_DEFUN([AX_BUILTIN_EXPECT], | ||||
| 3 | [ | ||||
| 4 | AC_MSG_CHECKING([whether __builtin_expect is understood]) | ||||
| 5 | SAVE_CFLAGS=$CFLAGS | ||||
| 6 | CFLAGS="-Werror $CFLAGS" | ||||
| 7 | AC_TRY_LINK(,[ | ||||
| 8 | int i; | ||||
| 9 | if (__builtin_expect(i, 0)) { } | ||||
| 10 | ], | ||||
| 11 | AC_MSG_RESULT([yes]); EXTRA_CFLAGS_MODULE="$EXTRA_CFLAGS_MODULE -DEXPECT_OK", | ||||
| 12 | AC_MSG_RESULT([no]);) | ||||
| 13 | CFLAGS=$SAVE_CFLAGS | ||||
| 14 | ] | ||||
| 15 | ) | ||||