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| author | Pádraig Brady <P@draigBrady.com> | 2011-01-07 01:25:06 +0000 |
|---|---|---|
| committer | Pádraig Brady <P@draigBrady.com> | 2011-01-07 11:07:20 +0000 |
| commit | d0270e7b630dd9c27e70ef46cc3ce5dac70dd574 (patch) | |
| tree | 13c24980428e47f696d4aec8b19b6a31d1831f58 /lib | |
| parent | 939dedd9a2fba934e5ff0313155f9f5f39cb6f6f (diff) | |
| download | gnulib-d0270e7b630dd9c27e70ef46cc3ce5dac70dd574.tar.gz | |
ignore-value: clarify some comments
* lib/ignore-value.h: Add Eric Blake as an author since
he rewrote the macros.
(ignore_value): Specify exactly when the GCC warn_unused_result
feature became available.
(ignore_ptr): Mention that ignore_value supports aggregates.
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/ignore-value.h | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/lib/ignore-value.h b/lib/ignore-value.h index 52804dc23b..7fd4772f01 100644 --- a/lib/ignore-value.h +++ b/lib/ignore-value.h @@ -15,7 +15,7 @@ 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 and Pádraig Brady. */ +/* Written by Jim Meyering, Eric Blake and Pádraig Brady. */ /* Use "ignore_value" to avoid a warning when using a function declared with gcc's warn_unused_result attribute, but for which you really do want to @@ -47,13 +47,17 @@ # endif # endif -# if __GNUC__ < 3 || (__GNUC__ == 3 && __GNUC_MINOR__ < 1) +/* The __attribute__((__warn_unused_result__)) feature + is available in gcc versions 3.4 and newer, + while the typeof feature has been available since 2.7 at least. */ +# if __GNUC__ < 3 || (__GNUC__ == 3 && __GNUC_MINOR__ < 4) # define ignore_value(x) ((void) (x)) # else # define ignore_value(x) (({ __typeof__ (x) __x = (x); (void) __x; })) # endif -/* ignore_value works for both scalars and pointers; deprecate ignore_ptr. */ +/* ignore_value works for scalars, pointers and aggregates; + deprecate ignore_ptr. */ static inline void ATTRIBUTE_DEPRECATED ignore_ptr (void *p) { (void) p; } /* deprecated: use ignore_value */ |