Public bug reported:
Some functions that have warn-unused-result cannot be used in a way
described in http://gcc.gnu.org/onlinedocs/gcc-4.4.1/gcc/Warning-
Options.html
For example this line (where STDOUT_FILENO==0 and FLAG_EXIT_NOW is defined as
some string):
(void) write(STDOUT_FILENO, FLAG_EXIT_NOW, sizeof FLAG_EXIT_NOW - 1);
compiled with:
cc -g -O -W -Wall -Wno-system-headers -Werror -Wunused-parameter
-Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Wreturn-type
-Wcast-qual -Wwrite-strings -Wswitch -Wshadow -Wcast-align -Wunused-
parameter -Wchar-subscripts -Winline -Wnested-externs -Wredundant-decls
-c ....
will report "error: ignoring return value of ‘write’, declared with
attribute warn_unused_result". According to gcc docs, casting to (void)
should prevent that.
ProblemType: Bug
Architecture: i386
Date: Thu Nov 5 22:31:44 2009
DistroRelease: Ubuntu 9.10
Package: gcc 4:4.4.1-1ubuntu2
ProcEnviron:
LANGUAGE=pl_PL.UTF-8
PATH=(custom, no user)
LANG=pl_PL.UTF-8
SHELL=/bin/zsh
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
SourcePackage: gcc-defaults
Uname: Linux 2.6.31-14-generic i686
** Affects: gcc-defaults (Ubuntu)
Importance: Undecided
Status: New
** Tags: apport-bug i386
--
-Wunused-value cannot be suppressed
https://bugs.launchpad.net/bugs/475934
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