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

 1AC_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])