[Bug nptl/21513] pthread_cleanup_push macro generates warning when -Wclobbered is set

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=21513

--- Comment #5 from Florian Weimer <fweimer at redhat dot com> ---
(In reply to Andreas Schwab from comment #4)
> The warning is about undefined behaviour.

Sorry for being unclear.  I don't understand if this warning indicates a
genuine code generation problem for this particular compilation, or if it is a
warning about a potential portability hazard.  But perhaps the difference does
not matter.

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