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authorJörg Frings-Fürst <debian@jff.email>2022-01-08 11:51:07 +0100
committerJörg Frings-Fürst <debian@jff.email>2022-01-08 11:51:07 +0100
commitbe8efac78d067c138ad8dda03df4336e73f94887 (patch)
tree5f5254a628ba0ef72065b93d949d1c985742ea8e /gnulib-m4/free.m4
parent7b65dbd4ebade81d504cfe5e681292a58ad1fdf0 (diff)
New upstream version 1.0upstream/1.0
Diffstat (limited to 'gnulib-m4/free.m4')
-rw-r--r--gnulib-m4/free.m452
1 files changed, 52 insertions, 0 deletions
diff --git a/gnulib-m4/free.m4 b/gnulib-m4/free.m4
new file mode 100644
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+++ b/gnulib-m4/free.m4
@@ -0,0 +1,52 @@
+# free.m4 serial 6
+# Copyright (C) 2003-2005, 2009-2022 Free Software Foundation, Inc.
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# Written by Paul Eggert and Bruno Haible.
+
+AC_DEFUN([gl_FUNC_FREE],
+[
+ AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
+
+ dnl In the next release of POSIX, free must preserve errno.
+ dnl https://www.austingroupbugs.net/view.php?id=385
+ dnl https://sourceware.org/bugzilla/show_bug.cgi?id=17924
+ dnl So far, we know of three platforms that do this:
+ dnl * glibc >= 2.33, thanks to the fix for this bug:
+ dnl <https://sourceware.org/bugzilla/show_bug.cgi?id=17924>
+ dnl * OpenBSD >= 4.5, thanks to this commit:
+ dnl <https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/lib/libc/stdlib/malloc.c.diff?r1=1.100&r2=1.101&f=h>
+ dnl * Solaris, because its malloc() implementation is based on brk(),
+ dnl not mmap(); hence its free() implementation makes no system calls.
+ dnl For other platforms, you can only be sure if they state it in their
+ dnl documentation, or by code inspection of the free() implementation in libc.
+ AC_CACHE_CHECK([whether free is known to preserve errno],
+ [gl_cv_func_free_preserves_errno],
+ [AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <stdlib.h>
+ ]],
+ [[#if 2 < __GLIBC__ + (33 <= __GLIBC_MINOR__)
+ #elif defined __OpenBSD__
+ #elif defined __sun
+ #else
+ #error "'free' is not known to preserve errno"
+ #endif
+ ]])],
+ [gl_cv_func_free_preserves_errno=yes],
+ [gl_cv_func_free_preserves_errno=no])
+ ])
+
+ case $gl_cv_func_free_preserves_errno in
+ *yes)
+ AC_DEFINE([HAVE_FREE_POSIX], [1],
+ [Define if the 'free' function is guaranteed to preserve errno.])
+ ;;
+ *) REPLACE_FREE=1 ;;
+ esac
+])
+
+# Prerequisites of lib/free.c.
+AC_DEFUN([gl_PREREQ_FREE], [:])