Charles Campbell wrote:
> I just noticed that there's a warning when compiling with gcc under
> scientific linux:
>
> misc2.c: In function 'put_time':
> misc2.c:6312: warning: ignoring return value of 'fwrite', declared with
> attribute warn_unused_result
>
> In grep'ing through the patches, I see this one must have creeped in
> back with patch#649, which in turn was trying to get rid of an annoying
> compiler message for whatever compiler Michael Jarvis used. The
> solution was to use (void)fwrite(...) in the put_time() function, but
> gcc v4.4.7 gets grumpy even when explicitly told not to worry by the
> (void) cast. IMHO gcc should let explicitly specified ignored values go
> unmentioned, but there it is.
>
> Presumably, given the optimization and fortify settings, the function is
> prototyped with __attribute_warn_unused_result__ .
>
> There are two solutions:
>
> * apply given patch: this removes the warning using gcc at the price of
> a "silly" variable assignment. I'm afraid that I wouldn't be surprised
> if some compiler out there flags silly as an unused variable, though.
> * specify either -U_FORTIFY_SOURCE or -D_FORTIFY_SOURCE=0 . Probably
> won't want to do that, I'd guess.
>
> I didn't see any -W... settings to turn this message off, btw.
Let's do it the same way as with put_bytes(): return OK or FAIL
depending on what fwrite() returns, which then gets ignored.
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