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SubjectRe: tools/perf compile error: ignoring return value of 'read', declared with attribute warn_unused_result

* Kevin Winchester <kjwinchester@gmail.com> wrote:

> CC builtin-stat.o
> cc1: warnings being treated as errors
> builtin-stat.c: In function 'run_perf_stat':
> builtin-stat.c:243: error: ignoring return value of 'read', declared with attribute warn_unused_result
> builtin-stat.c:256: error: ignoring return value of 'read', declared with attribute warn_unused_result
> make: *** [builtin-stat.o] Error 1
>
> Apparently my version of gcc and/or glibc do not agree with -Werror. Would the fix be as simple as:
>
> if *read(go_pipe[0], &buf, 1) < 0) {
> perror("Failed to read go_pipe.");
> exit(1);
> }
>
> ?

Yeah, that's Ubuntu doing some must-check-warnings via headers,
right?

Frederic fixed a bug there yesterday - mind checking the latest
perfcounters code at:

http://people.redhat.com/mingo/tip.git/README

?

Thanks,

Ingo


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