/thirdparty/breakpad/third_party/glog/m4/ac_have_builtin_expect.m4

http://github.com/tomahawk-player/tomahawk · m4 · 14 lines · 14 code · 0 blank · 0 comment · 0 complexity · d5d8f1c22bec44646f2056d47e5da270 MD5 · raw file

  1. AC_DEFUN([AX_C___BUILTIN_EXPECT], [
  2. AC_MSG_CHECKING(for __builtin_expect)
  3. AC_CACHE_VAL(ac_cv___builtin_expect, [
  4. AC_TRY_COMPILE(
  5. [int foo(void) { if (__builtin_expect(0, 0)) return 1; return 0; }],
  6. [],
  7. ac_cv___builtin_expect=yes,
  8. ac_cv___builtin_expect=no
  9. )])
  10. if test "$ac_cv___builtin_expect" = "yes"; then
  11. AC_DEFINE(HAVE___BUILTIN_EXPECT, 1, [define if your compiler has __builtin_expect])
  12. fi
  13. AC_MSG_RESULT($ac_cv___builtin_expect)
  14. ])