[Bug nptl/29834] libpthread.so lacks GLIBC_PRIVATE version for glibc 2.34 and later

["misch at google dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=29834

--- Comment #3 from Michael Schaller <misch at google dot com> ---
> Do I understand this correctly? The program does not actually need a definition of the weak symbol?

That is indeed the case. The attached patch just restores the GLIBC_PRIVATE
version for libpthread.so and that was sufficient to get the Synopsys binaries
working again.

> And we just run into a limitation in the GNU symbol versioning scheme, where we do not have weak symbol versions at all (VER_FLG_WEAK is generally understood to mean something else)?

I'm not sure I can answer that. My understanding of symbol versioning and weak
symbols is rudimentary and it took me a while to understand that "version
`GLIBC_PRIVATE' not found" literally means that the version was removed.

> Would it be sufficient if we make this work again by setting an environment variable?

I guess yes. Wouldn't it be easier though to just restore the GLIBC_PRIVATE
version as we did with the attached patch? Alternatively maybe the dynamic
loader could be changed to ignore a missing version for a weak symbol.

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