[LLVMdev] __atomic_fetch_add on ARM

[Renato Golin]

Hi Benjamin,

Several people (including me) are hitting this bug on ARM:

http://llvm.org/bugs/show_bug.cgi?id=15429

>From my investigations it happens on Ubuntu 12.10+ but not on 12.04. From
Tom Gail's, it happens with --enable-optimized and doesn't without. You
seem to have a clue on what that happens, can you shed some light on the
matter?

I see this error when self-hosting Clang on Ubuntu 12.10 on ARM but hadn't
had time to investigate with the release process running on Ubuntu 12.04.
We can certainly help you debug this, or if you point me to the right place
I can do some tests and send a patch as soon as possible.

cheers,
--renato
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