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