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# posix_memalign.m4 serial 1
dnl Copyright (C) 2020-2023 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
AC_DEFUN([gl_FUNC_POSIX_MEMALIGN],
[
AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
dnl Persuade glibc <stdlib.h> to declare posix_memalign().
AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
AC_CHECK_FUNCS_ONCE([posix_memalign])
if test $ac_cv_func_posix_memalign = yes; then
dnl On OpenBSD 6.1, posix_memalign (&p, 32, 2406) returns a pointer
dnl that is not a multiple of 32.
AC_CACHE_CHECK([whether posix_memalign works for large alignments],
[gl_cv_func_posix_memalign_works],
[AC_RUN_IFELSE(
[AC_LANG_PROGRAM(
[[#include <stdlib.h>
]],
[[void *p;
if (posix_memalign (&p, 32, 2406) == 0)
if (((unsigned long)p % 32) != 0)
return 1;
return 0;
]])
],
[gl_cv_func_posix_memalign_works=yes],
[gl_cv_func_posix_memalign_works=no],
[case "$host_os" in
# Guess no on OpenBSD.
openbsd*) gl_cv_func_posix_memalign_works="guessing no" ;;
# If we don't know, obey --enable-cross-guesses.
*) gl_cv_func_posix_memalign_works="$gl_cross_guess_normal" ;;
esac
])
])
case "$gl_cv_func_posix_memalign_works" in
*yes) ;;
*) REPLACE_POSIX_MEMALIGN=1 ;;
esac
else
dnl The system does not have posix_memalign.
HAVE_POSIX_MEMALIGN=0
fi
])
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