Christian Haggstrom <chm@c00.info>
GPLWithACException
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other's C Support (released)
Provides a test for the compiler support of __attribute__
extensions. defines HAVE___ATTRIBUTE__ if it is found.
Originating from the 'pork' package by Ryan McCabe <ryan@numb.org>
# 2007-07-23 Stepan Kasal <skasal@redhat.com>
# - fix for gcc4, use "ax_cv_" prefix, avoid obsolete AC_TRY_COMPILE
AC_DEFUN([AX_C___ATTRIBUTE__], [
AC_CACHE_CHECK([for __attribute__], [ax_cv___attribute__],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[[#include <stdlib.h>
static void foo(void) __attribute__ ((unused));
static void
foo(void) {
exit(1);
}
]], [])],
[ax_cv___attribute__=yes],
[ax_cv___attribute__=no]
)
])
if test "$ax_cv___attribute__" = "yes"; then
AC_DEFINE([HAVE___ATTRIBUTE__], 1, [define if your compiler has __attribute__])
fi
])