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author | Richard Maw <richard.maw@codethink.co.uk> | 2012-01-11 10:45:00 +0000 |
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committer | Richard Maw <richard.maw@codethink.co.uk> | 2012-01-11 10:45:00 +0000 |
commit | 24d1733e78a17d71aea6912144394ed7d3a82d50 (patch) | |
tree | 069608d934a8716d55a94c62c4bd75c1152f868c /tests/gnu/ignore-value.h | |
parent | d7b9fe130c2305d44fa1023283d3c2fcd389ba93 (diff) | |
download | m4-24d1733e78a17d71aea6912144394ed7d3a82d50.tar.gz |
remove .gitignores and add the rest of the files
Diffstat (limited to 'tests/gnu/ignore-value.h')
-rwxr-xr-x | tests/gnu/ignore-value.h | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/tests/gnu/ignore-value.h b/tests/gnu/ignore-value.h new file mode 100755 index 00000000..2eb6918d --- /dev/null +++ b/tests/gnu/ignore-value.h @@ -0,0 +1,37 @@ +/* ignore a function return without a compiler warning + + Copyright (C) 2008-2010 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 <http://www.gnu.org/licenses/>. */ + +/* Written by Jim Meyering. */ + +/* Use these functions to avoid a warning when using a function declared with + gcc's warn_unused_result attribute, but for which you really do want to + ignore the result. Traditionally, people have used a "(void)" cast to + indicate that a function's return value is deliberately unused. However, + if the function is declared with __attribute__((warn_unused_result)), + gcc issues a warning even with the cast. + + Caution: most of the time, you really should heed gcc's warning, and + check the return value. However, in those exceptional cases in which + you're sure you know what you're doing, use this function. + + For the record, here's one of the ignorable warnings: + "copy.c:233: warning: ignoring return value of 'fchown', + declared with attribute warn_unused_result". */ + +static inline void ignore_value (int i) { (void) i; } +static inline void ignore_ptr (void* p) { (void) p; } +/* FIXME: what about aggregate types? */ |