github.com/jlmucb/cloudproxy@v0.0.0-20170830161738-b5aa0b619bc4/src/third_party/gflags/m4/ac_have_attribute.m4 (about)

     1  AC_DEFUN([AX_C___ATTRIBUTE__], [
     2    AC_MSG_CHECKING(for __attribute__)
     3    AC_CACHE_VAL(ac_cv___attribute__, [
     4      AC_TRY_COMPILE(
     5        [#include <stdlib.h>
     6         static void foo(void) __attribute__ ((unused));
     7         void foo(void) { exit(1); }],
     8        [],
     9        ac_cv___attribute__=yes,
    10        ac_cv___attribute__=no
    11      )])
    12    if test "$ac_cv___attribute__" = "yes"; then
    13      AC_DEFINE(HAVE___ATTRIBUTE__, 1, [define if your compiler has __attribute__])
    14    fi
    15    AC_MSG_RESULT($ac_cv___attribute__)
    16  ])