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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
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<title>
Autoconf Macro: ax_func_posix_memalign
</title>
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"http://autoconf-archive.cryp.to/ax_func_posix_memalign.m4">Download M4
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<hr>
<h1>
ax_func_posix_memalign
</h1>
<h2>
Synopsis
</h2>
<p class="indent" style="white-space:nowrap;">
<code>AX_FUNC_POSIX_MEMALIGN</code>
</p>
<h2>
Description
</h2>
<div class="indent">
<p>
Some versions of posix_memalign (notably glibc 2.2.5) incorrectly apply
their power-of-two check to the size argument, not the alignment argument.
AX_FUNC_POSIX_MEMALIGN defines HAVE_POSIX_MEMALIGN if the power-of-two
check is correctly applied to the alignment argument.
</p>
</div>
<h2>
Author
</h2>
<p class="indent">
Scott Pakin <pakin@uiuc.edu>
</p>
<h2>
Last Modified
</h2>
<p class="indent">
2005-01-22
</p>
<h2>
M4 Source Code
</h2>
<div class="indent">
<pre class="m4source">
AC_DEFUN([AX_FUNC_POSIX_MEMALIGN],
[AC_CACHE_CHECK([for working posix_memalign],
[ax_cv_func_posix_memalign_works],
[AC_TRY_RUN([
#include <stdlib.h>
int
main ()
{
void *buffer;
/* Some versions of glibc incorrectly perform the alignment check on
* the size word. */
exit (posix_memalign (&buffer, sizeof(void *), 123) != 0);
}
],
[ax_cv_func_posix_memalign_works=yes],
[ax_cv_func_posix_memalign_works=no],
[ax_cv_func_posix_memalign_works=no])])
if test "$ax_cv_func_posix_memalign_works" = "yes" ; then
AC_DEFINE([HAVE_POSIX_MEMALIGN], [1],
[Define to 1 if `posix_memalign' works.])
fi
])
</pre>
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