38 lines
1.2 KiB
Plaintext
38 lines
1.2 KiB
Plaintext
dnl Copyright (C) 2004-2008 Kim Woelders
|
|
dnl This code is public domain and can be freely used or copied.
|
|
dnl Originally snatched from somewhere...
|
|
|
|
dnl Macro for checking if the compiler supports __attribute__
|
|
|
|
dnl Usage: EC_C___ATTRIBUTE__
|
|
|
|
dnl Call AC_DEFINE for HAVE___ATTRIBUTE__ and __UNUSED__.
|
|
dnl If the compiler supports __attribute__, HAVE___ATTRIBUTE__ is
|
|
dnl defined to 1 and __UNUSED__ is defined to __attribute__((unused))
|
|
dnl otherwise, HAVE___ATTRIBUTE__ is not defined and __UNUSED__ is
|
|
dnl defined to nothing.
|
|
|
|
AC_DEFUN([EC_C___ATTRIBUTE__],
|
|
[
|
|
AC_MSG_CHECKING(for __attribute__)
|
|
AC_CACHE_VAL(ec_cv___attribute__, [
|
|
AC_COMPILE_IFELSE([
|
|
AC_LANG_PROGRAM(
|
|
[[
|
|
#include <stdlib.h>
|
|
int foo(int x __attribute__ ((unused))) { exit(1); }
|
|
]])
|
|
],
|
|
ec_cv___attribute__=yes,
|
|
ec_cv___attribute__=no)
|
|
])
|
|
|
|
if test "$ec_cv___attribute__" = "yes"; then
|
|
AC_DEFINE(HAVE___ATTRIBUTE__, 1, [Define to 1 if your compiler has __attribute__])
|
|
AC_DEFINE(__UNUSED__, __attribute__((unused)), [Macro declaring a function argument to be unused])
|
|
else
|
|
AC_DEFINE(__UNUSED__, , [Macro declaring a function argument to be unused])
|
|
fi
|
|
AC_MSG_RESULT($ec_cv___attribute__)
|
|
])
|