[Bug 2089] errno not threadsafe

[bugzilla at busybox.net]

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

--- Comment #8 from Peter Korsgaard <jacmet at uclibc.org>  ---
(In reply to comment #7)

> the problem is that we should not genetate __GI__* symbols when generating non
> PIC.a file currently there are refrences to these __GI symbols in libc so when
> you link statically then the references in libc get resolved to libc's __GI_ 
> errno symbols

Hmm, isn't this exactly like how we do it for malloc/free? I don't see any
references to __GI_malloc or __GI__errno_location when I like statically?

> unhiding these symbols as patch does may not be the right solution. think of
> shared objects it will have undefined behavior when both libc and libpthread
> are loaded.
> it will depend on load order which one is chosen

Also when the libc version is marked as weak? I haven't seen that issue. Libc
gets added very early to the linker, so the libpthread version seems to always
override it.

> I think there is need to clean up the build for pic and non pic build of libc.a
> look into this area

So what exactly do you suggest?

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