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# aligned_alloc.m4
# serial 9
dnl Copyright (C) 2020-2025 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.
dnl This file is offered as-is, without any warranty.
AC_DEFUN([gl_FUNC_ALIGNED_ALLOC],
[
AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
dnl Persuade glibc and OpenBSD <stdlib.h> to declare aligned_alloc().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
gl_CHECK_FUNCS_ANDROID([aligned_alloc], [[#include <stdlib.h>]])
if test $ac_cv_func_aligned_alloc = yes; then
dnl On macOS 11.1 and AIX 7.3.1, aligned_alloc returns NULL when the
dnl alignment argument is smaller than sizeof (void *).
dnl On Solaris 11.4, aligned_alloc returns NULL if the size is not a
dnl multiple of the alignment.
dnl On macOS 15, AIX 7.3, Solaris 11.4, aligned_alloc with a zero size
dnl returns NULL.
AC_CACHE_CHECK([whether aligned_alloc works for small alignments and sizes],
[gl_cv_func_aligned_alloc_works],
[AC_RUN_IFELSE(
[AC_LANG_PROGRAM(
[[#include <stdlib.h>
/* Use paligned_alloc to test; 'volatile' prevents the compiler
from optimizing the aligned_alloc call away. */
void *(*volatile paligned_alloc) (size_t, size_t)
= aligned_alloc;]],
[[int result = 0;
{
void *p = paligned_alloc (2, 18);
if (p == NULL)
result |= 1;
}
{
void *p = paligned_alloc (sizeof (void *), sizeof (void *) + 1);
if (p == NULL)
result |= 2;
}
{
void *p = paligned_alloc (sizeof (void *), 0);
if (p == NULL)
result |= 4;
}
return result;
]])
],
[gl_cv_func_aligned_alloc_works=yes],
[gl_cv_func_aligned_alloc_works=no],
[case "$host_os" in
# Guess no on macOS.
darwin*) gl_cv_func_aligned_alloc_works="guessing no" ;;
# Guess no on AIX.
aix*) gl_cv_func_aligned_alloc_works="guessing no" ;;
# Guess no on Solaris.
solaris*) gl_cv_func_aligned_alloc_works="guessing no" ;;
# If we don't know, obey --enable-cross-guesses.
*) gl_cv_func_aligned_alloc_works="$gl_cross_guess_normal" ;;
esac
])
])
case "$gl_cv_func_aligned_alloc_works" in
*yes) ;;
*) REPLACE_ALIGNED_ALLOC=1 ;;
esac
else
dnl The system does not have aligned_alloc.
HAVE_ALIGNED_ALLOC=0
case "$gl_cv_onwards_func_aligned_alloc" in
future*) REPLACE_ALIGNED_ALLOC=1 ;;
esac
fi
])
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