summaryrefslogtreecommitdiff
path: root/lib/ignore-value.h
diff options
context:
space:
mode:
authorAndy Wingo <wingo@pobox.com>2015-10-25 10:49:41 +0000
committerAndy Wingo <wingo@pobox.com>2015-10-25 10:55:14 +0000
commit95ac2204d9084a01677fff9eb2669c495bd07d3d (patch)
treeb603eaaf67caaab75489478ab51605a70be006fa /lib/ignore-value.h
parent1c9e23c0901363ff24c1dc4e085e7ed68cb81e6d (diff)
downloadguile-95ac2204d9084a01677fff9eb2669c495bd07d3d.tar.gz
Revert "Update Gnulib to v0.1-603-g1d16a7b"
This reverts commit 2d4da30fdefbcdb065d4b1f48f2a77d06f69e3c3. This Gnulib update was causing failures related to timezones in stime.c. I tried to fix it by adopting the time_rz module from gnulib but that then caused other failures. We can try again later.
Diffstat (limited to 'lib/ignore-value.h')
-rw-r--r--lib/ignore-value.h37
1 files changed, 37 insertions, 0 deletions
diff --git a/lib/ignore-value.h b/lib/ignore-value.h
new file mode 100644
index 000000000..86cfad77b
--- /dev/null
+++ b/lib/ignore-value.h
@@ -0,0 +1,37 @@
+/* ignore a function return without a compiler warning
+
+ Copyright (C) 2008-2009 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? */