github.com/jlmucb/cloudproxy@v0.0.0-20170830161738-b5aa0b619bc4/src/third_party/google-glog/m4/.svn/text-base/ac_have_builtin_expect.m4.svn-base (about)

     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  ])