I have a target which is old enough that it doesn't support thread local 
variables.  I'd like to build the protobuf3 libraries for it.

It looks like all I need to do is trigger arena.h and arena.cc to use the 
version of thread_cache that is used by Android which 
uses pthread_key_create.  One way to do that would be to add 
a GOOGLE_PROTOBUF_NO_THREADLOCAL variable and use that.  I've got that 
working locally as a proof of concept.  I'd like to get a change upstreamed 
to support this use case.  How would you approach solving that?  I'll 
happily write the patch if it isn't too tricky.


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