[Bug 2089] errno not threadsafe

[bugzilla at busybox.net]

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

--- Comment #10 from Peter Korsgaard <jacmet at uclibc.org>  ---
(In reply to comment #9)
> > So what exactly do you suggest?
> 
> We need to say that when compiling static libc.a then dont use this
> hidden_proto and hidden_def because it does not matter in that case.
> 
> but when compiling PIC version then we use it.

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.

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