gcc-4.6.0-0.12.fc15.x86_64 breaks strcmp?

Jakub Jelinek jakub at redhat.com
Mon Mar 7 16:17:37 UTC 2011


On Mon, Mar 07, 2011 at 05:15:18PM +0100, Jim Meyering wrote:
> With the former and -O3, I do see your warning.
> Here's a pared-down test case:
> 
>     $ cat k.c
>     #include <string.h>
>     void do_rm_rf (const char *p) { if (strcmp (p, "/") == 0) return; }
>     $ gcc -Wall -O3 -c k.c -Werror=strict-overflow
>     k.c: In function ‘do_rm_rf’:
>     k.c:2:1678: error: assuming signed overflow does not occur when changing X +- C1 cmp C2 to X cmp C1 +- C2 [-Werror=strict-overflow]
>     cc1: some warnings being treated as errors

FYI, as a workaround -D__NO_STRING_INLINES should work, then strcmp
isn't expanded to the fancy glibc expansion...

	Jakub


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