[llvm-commits] cross building fixes

[Sandeep Patel]

The attached patches attempt to fix cross builds. For example, if you
try to use i686-darwin to build for arm-eabi, you'll quickly run into
several false assumptions that the target OS must be the same as the
host OS. These patches split $(OS) into $(HOST_OS) and $(TARGET_OS) to
help builds like "make check" and the test-suite able to cross
compile. Along the way a target of *-unknown-eabi is defined as
"Freestanding" so that TARGET_OS checks have something to work with.

Also attached is a patch to add a definition for
__STDC_CONSTANT_MACROS so that llvm2cpp doesn't fail during make check
on a cross.

deep
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