Package: gcc-4.4
Version: 4.4.5-8
Severity: minor
The shell script below reproduces this problem. Notice that the
function name is incorrect (on my system the name shown is "T.4"). I
get this result when I run the script:
~$ sh t98.sh
t98.c: In function ‘T.4’:
t98.c:5: warning: assuming signed overflow does not occur when changing X +- C1
cmp C2 to X cmp C1 +- C2
I believe that correct output would be something like
t98.c: In function ‘ff’:
t98.c:5: warning: assuming signed overflow does not occur when changing X +- C1
cmp C2 to X cmp C1 +- C2
Here is the script to reproduce the problem (I think it's minimal):
#! /bin/sh
cat >| t98.c <<EOF
#include <string.h>
static void ff (const char *dir)
{
if (strcmp (".", dir))
return;
strdup (dir);
strdup (dir);
}
int main (int argc, char **argv)
{
ff ("hello");
ff ("hello");
return 0;
}
EOF
gcc -Wstrict-overflow -O2 -c t98.c
I get the same effect with -m32 and -m64, though at -O3 the message is
correct, while at -O1 the warning isn't given at all. Clearly not
passing -Wstrict-overflow will also silence the message.
-- System Information:
Debian Release: 6.0.1
APT prefers stable
APT policy: (500, 'stable')
Architecture: amd64 (x86_64)
Kernel: Linux 2.6.32-5-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_IE.UTF-8, LC_CTYPE=en_IE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Versions of packages gcc-4.4 depends on:
ii binutils 2.20.1-16 The GNU assembler, linker and bina
ii cpp-4.4 4.4.5-8 The GNU C preprocessor
ii gcc-4.4-base 4.4.5-8 The GNU Compiler Collection (base
ii libc6 2.11.2-10 Embedded GNU C Library: Shared lib
ii libgcc1 1:4.4.5-8 GCC support library
ii libgomp1 4.4.5-8 GCC OpenMP (GOMP) support library
Versions of packages gcc-4.4 recommends:
ii libc6-dev 2.11.2-10 Embedded GNU C Library: Developmen
Versions of packages gcc-4.4 suggests:
ii gcc-4.4-doc 4.4.4.nf1-1 documentation for the GNU compiler
pn gcc-4.4-locales <none> (no description available)
ii gcc-4.4-multilib 4.4.5-8 The GNU C compiler (multilib files
pn libcloog-ppl0 <none> (no description available)
ii libgcc1-dbg 1:4.4.5-8 GCC support library (debug symbols
pn libgomp1-dbg <none> (no description available)
pn libmudflap0-4.4-dev <none> (no description available)
pn libmudflap0-dbg <none> (no description available)
pn libppl-c2 <none> (no description available)
pn libppl7 <none> (no description available)
-- no debconf information
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