/src/augeas/gnulib/lib/free.c
Line | Count | Source |
1 | | /* Make free() preserve errno. |
2 | | |
3 | | Copyright (C) 2003, 2006, 2009-2022 Free Software Foundation, Inc. |
4 | | |
5 | | This file is free software: you can redistribute it and/or modify |
6 | | it under the terms of the GNU Lesser General Public License as |
7 | | published by the Free Software Foundation; either version 2.1 of the |
8 | | License, or (at your option) any later version. |
9 | | |
10 | | This file is distributed in the hope that it will be useful, |
11 | | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
13 | | GNU Lesser General Public License for more details. |
14 | | |
15 | | You should have received a copy of the GNU Lesser General Public License |
16 | | along with this program. If not, see <https://www.gnu.org/licenses/>. */ |
17 | | |
18 | | /* written by Paul Eggert */ |
19 | | |
20 | | #include <config.h> |
21 | | |
22 | | /* Specification. */ |
23 | | #include <stdlib.h> |
24 | | |
25 | | /* A function definition is only needed if HAVE_FREE_POSIX is not defined. */ |
26 | | #if !HAVE_FREE_POSIX |
27 | | |
28 | | # include <errno.h> |
29 | | |
30 | | void |
31 | | rpl_free (void *p) |
32 | | # undef free |
33 | 175M | { |
34 | | # if defined __GNUC__ && !defined __clang__ |
35 | | /* An invalid GCC optimization |
36 | | <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98396> |
37 | | would optimize away the assignments in the code below, when link-time |
38 | | optimization (LTO) is enabled. Make the code more complicated, so that |
39 | | GCC does not grok how to optimize it. */ |
40 | | int err[2]; |
41 | | err[0] = errno; |
42 | | err[1] = errno; |
43 | | errno = 0; |
44 | | free (p); |
45 | | errno = err[errno == 0]; |
46 | | # else |
47 | 175M | int err = errno; |
48 | 175M | free (p); |
49 | 175M | errno = err; |
50 | 175M | # endif |
51 | 175M | } |
52 | | |
53 | | #endif |