thread-ready ABIs

[Ulrich Drepper]

Geoff Keating <geoffk@geoffk.org> writes:

> It will be %r2 for ELF.  No register is available for AIX and I will
> leave that unless someone can make a proposal.

AIX is no issue.  We don't determine the ABI, it's IBM's problem.
glibc will work as before on AIX.

Is %r2 currently unused?  If this a break in the ABI?

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