mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-12-11 09:20:51 +00:00
54 lines
1.5 KiB
C
54 lines
1.5 KiB
C
/* Make free() preserve errno.
|
|
|
|
Copyright (C) 2003, 2006, 2009-2022 Free Software Foundation, Inc.
|
|
|
|
This file is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU Lesser General Public License as
|
|
published by the Free Software Foundation; either version 2.1 of the
|
|
License, or (at your option) any later version.
|
|
|
|
This file is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with this program. If not, see <https://www.gnu.org/licenses/>. */
|
|
|
|
/* written by Paul Eggert */
|
|
|
|
#include <config.h>
|
|
|
|
/* Specification. */
|
|
#include <stdlib.h>
|
|
|
|
/* A function definition is only needed if HAVE_FREE_POSIX is not defined. */
|
|
#if !HAVE_FREE_POSIX
|
|
|
|
# include <errno.h>
|
|
|
|
void
|
|
rpl_free (void *p)
|
|
# undef free
|
|
{
|
|
# if defined __GNUC__ && !defined __clang__
|
|
/* An invalid GCC optimization
|
|
<https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98396>
|
|
would optimize away the assignments in the code below, when link-time
|
|
optimization (LTO) is enabled. Make the code more complicated, so that
|
|
GCC does not grok how to optimize it. */
|
|
int err[2];
|
|
err[0] = errno;
|
|
err[1] = errno;
|
|
errno = 0;
|
|
free (p);
|
|
errno = err[errno == 0];
|
|
# else
|
|
int err = errno;
|
|
free (p);
|
|
errno = err;
|
|
# endif
|
|
}
|
|
|
|
#endif
|