68 lines
2.6 KiB
Text
68 lines
2.6 KiB
Text
# posix_memalign.m4
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# serial 6
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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_POSIX_MEMALIGN],
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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 <stdlib.h> to declare posix_memalign().
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AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
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gl_CHECK_FUNCS_ANDROID([posix_memalign], [[#include <stdlib.h>]])
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if test $ac_cv_func_posix_memalign = yes; then
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dnl On OpenBSD 6.1, posix_memalign (&p, 32, 2406) stores a pointer
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dnl that is not a multiple of 32.
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dnl On AIX 7.3, aligned_alloc with a zero size returns NULL.
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AC_CACHE_CHECK(
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[whether posix_memalign works for large alignment or zero size],
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[gl_cv_func_posix_memalign_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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/* Use pposix_memalign to test; 'volatile' prevents the compiler
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from optimizing the posix_memalign call away. */
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int (*volatile pposix_memalign) (void **, size_t, size_t)
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= posix_memalign;]],
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[[void *p;
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if (pposix_memalign (&p, 0, sizeof (void *)) != 0)
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return 1;
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if (32 % sizeof (void *) == 0
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&& pposix_memalign (&p, 32, 2406) == 0
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&& (unsigned long) p % 32 != 0)
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return 1;
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return 0;
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]])
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],
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[gl_cv_func_posix_memalign_works=yes],
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[gl_cv_func_posix_memalign_works=no],
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[case "$host_os" in
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changequote(,)dnl
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# Guess no on AIX.
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aix*) gl_cv_func_posix_memalign_works="guessing no" ;;
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# Guess no on OpenBSD through 6.1.
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openbsd[1-5].* | openbsd6.[01] | openbsd6.[01].*)
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gl_cv_func_posix_memalign_works="guessing no" ;;
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# If we don't know, obey --enable-cross-guesses.
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*) gl_cv_func_posix_memalign_works="$gl_cross_guess_normal" ;;
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changequote([,])dnl
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esac
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])
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])
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case "$gl_cv_func_posix_memalign_works" in
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*yes) ;;
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*) REPLACE_POSIX_MEMALIGN=1 ;;
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esac
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else
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dnl The system does not have posix_memalign.
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HAVE_POSIX_MEMALIGN=0
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case "$gl_cv_onwards_func_posix_memalign" in
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future*) REPLACE_POSIX_MEMALIGN=1 ;;
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esac
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fi
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])
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