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# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_func_posix_memalign.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_FUNC_POSIX_MEMALIGN
#
# DESCRIPTION
#
# 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.
#
# LICENSE
#
# Copyright (c) 2008 Scott Pakin <pakin@uiuc.edu>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice
# and this notice are preserved. This file is offered as-is, without any
# warranty.
#serial 9
AC_DEFUN([AX_FUNC_POSIX_MEMALIGN],
[AC_CACHE_CHECK([for working posix_memalign],
[ax_cv_func_posix_memalign_works],
[AC_RUN_IFELSE([AC_LANG_SOURCE([[
#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
])
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