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53 lines
1.9 KiB
Plaintext
53 lines
1.9 KiB
Plaintext
# free.m4 serial 6
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# Copyright (C) 2003-2005, 2009-2022 Free Software Foundation, Inc.
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# This file is free software; the Free Software Foundation
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# gives unlimited permission to copy and/or distribute it,
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# with or without modifications, as long as this notice is preserved.
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# Written by Paul Eggert and Bruno Haible.
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AC_DEFUN([gl_FUNC_FREE],
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[
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AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
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dnl In the next release of POSIX, free must preserve errno.
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dnl https://www.austingroupbugs.net/view.php?id=385
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dnl https://sourceware.org/bugzilla/show_bug.cgi?id=17924
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dnl So far, we know of three platforms that do this:
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dnl * glibc >= 2.33, thanks to the fix for this bug:
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dnl <https://sourceware.org/bugzilla/show_bug.cgi?id=17924>
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dnl * OpenBSD >= 4.5, thanks to this commit:
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dnl <https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/lib/libc/stdlib/malloc.c.diff?r1=1.100&r2=1.101&f=h>
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dnl * Solaris, because its malloc() implementation is based on brk(),
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dnl not mmap(); hence its free() implementation makes no system calls.
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dnl For other platforms, you can only be sure if they state it in their
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dnl documentation, or by code inspection of the free() implementation in libc.
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AC_CACHE_CHECK([whether free is known to preserve errno],
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[gl_cv_func_free_preserves_errno],
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[AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM(
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[[#include <stdlib.h>
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]],
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[[#if 2 < __GLIBC__ + (33 <= __GLIBC_MINOR__)
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#elif defined __OpenBSD__
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#elif defined __sun
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#else
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#error "'free' is not known to preserve errno"
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#endif
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]])],
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[gl_cv_func_free_preserves_errno=yes],
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[gl_cv_func_free_preserves_errno=no])
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])
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case $gl_cv_func_free_preserves_errno in
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*yes)
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AC_DEFINE([HAVE_FREE_POSIX], [1],
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[Define if the 'free' function is guaranteed to preserve errno.])
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;;
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*) REPLACE_FREE=1 ;;
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esac
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])
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# Prerequisites of lib/free.c.
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AC_DEFUN([gl_PREREQ_FREE], [:])
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