| 1 | /* ignore a function return without a compiler warning |
| 2 | |
| 3 | Copyright (C) 2008-2009 Free Software Foundation, Inc. |
| 4 | |
| 5 | This program is free software: you can redistribute it and/or modify |
| 6 | it under the terms of the GNU General Public License as published by |
| 7 | the Free Software Foundation; either version 3 of the License, or |
| 8 | (at your option) any later version. |
| 9 | |
| 10 | This program 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 General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU General Public License |
| 16 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 17 | |
| 18 | /* Written by Jim Meyering. */ |
| 19 | |
| 20 | /* Use these functions to avoid a warning when using a function declared with |
| 21 | gcc's warn_unused_result attribute, but for which you really do want to |
| 22 | ignore the result. Traditionally, people have used a "(void)" cast to |
| 23 | indicate that a function's return value is deliberately unused. However, |
| 24 | if the function is declared with __attribute__((warn_unused_result)), |
| 25 | gcc issues a warning even with the cast. |
| 26 | |
| 27 | Caution: most of the time, you really should heed gcc's warning, and |
| 28 | check the return value. However, in those exceptional cases in which |
| 29 | you're sure you know what you're doing, use this function. |
| 30 | |
| 31 | For the record, here's one of the ignorable warnings: |
| 32 | "copy.c:233: warning: ignoring return value of 'fchown', |
| 33 | declared with attribute warn_unused_result". */ |
| 34 | |
| 35 | static inline void ignore_value (int i) { (void) i; } |
| 36 | static inline void ignore_ptr (void* p) { (void) p; } |
| 37 | /* FIXME: what about aggregate types? */ |