compnerd added a comment.
Right, we make it a cmake define corresponding to the AEABI name. In the
future when clang knows to correctly emit the macro, we just rely on that.
Figuring it out based on the target in my case means: `${CMAKE_C_COMPILER} -x c
-E - -dM <<< "__ARM_WMMX"`. Thats not too terrible to do, but since the
support for WMMX is rare, I think skimping on that bit of preparation is
acceptable too.
http://reviews.llvm.org/D21991
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