# Check whether free (NULL) is supposed to work.
-# Copyright (C) 2003 Free Software Foundation, Inc.
-
-# This file is free software, distributed under the terms of the GNU
-# General Public License. As a special exception to the GNU General
-# Public License, this file may be distributed as part of a program
-# that contains a configuration script generated by Autoconf, under
-# the same distribution terms as the rest of that program.
+# Copyright (C) 2003-2005, 2009-2011 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.
AC_DEFUN([gl_FUNC_FREE],
[
- AC_CHECK_HEADERS_ONCE(unistd.h)
AC_CACHE_CHECK([whether free (NULL) is known to work],
[gl_cv_func_free],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
- [[@%:@if HAVE_UNISTD_H
- @%:@include <unistd.h>
- @%:@endif]],
- [[@%:@if _POSIX_VERSION < 199009L && \
- (defined unix || defined _unix || defined _unix_ \
- || defined __unix || defined __unix__)
- @%:@error "'free (NULL)' is not known to work"
- @%:@endif]])],
+ [[@%:@include <unistd.h>]],
+ [[@%:@if _POSIX_VERSION < 199009L && \
+ (defined unix || defined _unix || defined _unix_ \
+ || defined __unix || defined __unix__)
+ @%:@error "'free (NULL)' is not known to work"
+ @%:@endif]])],
[gl_cv_func_free=yes],
[gl_cv_func_free=no])])
- if test $gl_cv_func_free = yes; then
- AC_LIBOBJ(free)
- AC_DEFINE(free, rpl_free,
+ if test $gl_cv_func_free = no; then
+ AC_DEFINE([free], [rpl_free],
[Define to rpl_free if the replacement function should be used.])
fi
])