[cfe-dev] Patch for Darwin's -pthread unused (PR 7798)

[Axel Naumann]

Hi,

here's a patch for PR 7798 <http://llvm.org/bugs/show_bug.cgi?id=7798>
which silences the pthread unused arg warning when linking on Darwin for
the sake of GCC compatibility. It's obviously not a replacement for
Daniel's improvements in the unused arg diagnostics announced in the bug
report. I didn't touch any other platform because I don't know their
behavior with respect to -pthread.

Let me know whether it's okay to commit it.

Cheers, Axel.
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