[Bug c/64639] false negative of -Wunused-value

[chengniansun at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64639

Chengnian Sun <chengniansun at gmail dot com> changed:

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--- Comment #2 from Chengnian Sun <chengniansun at gmail dot com> ---
(In reply to Andrew Pinski from comment #1)
> "(a = 0) != 0" has a side effect of setting a to 0.
> 
> I think in this case, clang is incorrectly warning about it.

I agree that (a = 0) has a side effect, but the comparison "!=" is not used.