[Bug 2089] errno not threadsafe

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=2089

--- Comment #12 from Peter Korsgaard <jacmet at uclibc.org>  ---
(In reply to comment #11)

> > But that means we're back to square one, right? Today, with a dynamic libc and
> > -pthread we end up using the __errno_location in libc, not in libpthread.
> 
> the libc one's will be weak symbols and libpthread ones will be strong so when
> linking libpthread.so will be preferred.

Yes, but that's not what happens as it is (libc version weak + hidden) - The
libc version is used within libc because of the hidden.

With my patch to remove the hidden it works.

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