| /* Make free() preserve errno. |
| |
| Copyright (C) 2003, 2006, 2009-2021 Free Software Foundation, Inc. |
| |
| This program is free software: you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program 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 General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program. If not, see <https://www.gnu.org/licenses/>. */ |
| |
| /* written by Paul Eggert */ |
| |
| #include <config.h> |
| |
| #include <stdlib.h> |
| |
| #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 |
| } |