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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
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Autoconf Macro: ax_c___attribute__
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<h1>
ax_c___attribute__
</h1>
<h2>
Synopsis
</h2>
<p class="indent" style="white-space:nowrap;">
<code>AX_C___ATTRIBUTE__</code>
</p>
<h2>
Description
</h2>
<div class="indent">
<p>
Provides a test for the compiler support of __attribute__ extensions.
defines HAVE___ATTRIBUTE__ if it is found.
</p>
<p>
Originating from the 'pork' package by Ryan McCabe <ryan@numb.org>
</p>
</div>
<h2>
Author
</h2>
<p class="indent">
Christian Haggstrom <chm@c00.info>
</p>
<h2>
Last Modified
</h2>
<p class="indent">
2005-01-21
</p>
<h2>
M4 Source Code
</h2>
<div class="indent">
<pre class="m4source">
AC_DEFUN([AX_C___ATTRIBUTE__], [
AC_MSG_CHECKING(for __attribute__)
AC_CACHE_VAL(ac_cv___attribute__, [
AC_TRY_COMPILE(
[#include <stdlib.h>],
[static void foo(void) __attribute__ ((unused));
static void
foo(void) {
exit(1);
}],
ac_cv___attribute__=yes,
ac_cv___attribute__=no
)])
if test "$ac_cv___attribute__" = "yes"; then
AC_DEFINE(HAVE___ATTRIBUTE__, 1, [define if your compiler has __attribute__])
fi
AC_MSG_RESULT($ac_cv___attribute__)
])
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