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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