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 ) 16
