Bug#504684: gcc-4.3: __attribute__((const)) breaks __attribute__((warn_unused_result))
Package: gcc-4.3
Version: 4.3.2-1
Severity: normal
Making a function __attribute__((const)) makes the warnings from
__attribute__((warn_unused_result)) go away.
I've attached a minimal testcase. Results:
$ echo == USE_CONST == ; gcc -DUSE_CONST -c test.c -o /dev/null ; echo == \!USE_CONST == ; gcc -c test.c -o /dev/null
== USE_CONST ==
== !USE_CONST ==
test.c: In function ‘update_rocket_state’:
test.c:14: warning: ignoring return value of ‘func’, declared with attribute warn_unused_result
- Josh Triplett and Jamey Sharp
-- System Information:
Debian Release: lenny/sid
APT prefers unstable
APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Kernel: Linux 2.6.27-1-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Versions of packages gcc-4.3 depends on:
ii binutils 2.18.1~cvs20080103-7 The GNU assembler, linker and bina
ii cpp-4.3 4.3.2-1 The GNU C preprocessor
ii gcc-4.3-base 4.3.2-1 The GNU Compiler Collection (base
ii libc6 2.7-16 GNU C Library: Shared libraries
ii libgcc1 1:4.3.2-1 GCC support library
ii libgomp1 4.3.2-1 GCC OpenMP (GOMP) support library
Versions of packages gcc-4.3 recommends:
ii libc6-dev 2.7-16 GNU C Library: Development Librari
Versions of packages gcc-4.3 suggests:
pn gcc-4.3-doc <none> (no description available)
pn gcc-4.3-locales <none> (no description available)
ii gcc-4.3-multilib 4.3.2-1 The GNU C compiler (multilib files
pn libgcc1-dbg <none> (no description available)
pn libgomp1-dbg <none> (no description available)
pn libmudflap0-4.3-dev <none> (no description available)
pn libmudflap0-dbg <none> (no description available)
-- no debconf information
#ifdef USE_CONST
int func(void) __attribute__((const)) __attribute__((warn_unused_result));
#else
int func(void) __attribute__((warn_unused_result));
#endif
void update_rocket_state(void)
{
func();
}
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