[llvm-commits] [patch] cmake make it possible to set LLVM_NATIVE_ARCH when cross compiling.

[Xerxes Rånby]

During cross compilation of llvm using cmake it are desirable to be able
to set the LLVM_NATIVE_ARCH so that the correct JIT can get linked in
and be used by the final cross compiled binarys.

This patch enables the cmake option -DLLVM_NATIVE_ARCH=ARM
If the value host are used then the cmake system will autodetect the
setting from the host system.

I have forced MSVC builds to use X86 as default.

Ok to push?

Cheers
Xerxes
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