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Commit 1b53bc78 authored by Bob Wilson's avatar Bob Wilson
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Fix cross-compiling problems in build-llvm.pl script. <rdar://problem/12986905>

As with llvm svn r172138, this patch is basically copying some changes that
we've been using for building clang at Apple. Besides cleaning it up to use
xcrun to locate the proper versions of tools, especially for cross compiling,
it fixes the build to work with newer versions of clang that honor SDKROOT
settings in the environment.

llvm-svn: 172324
parent f857950d
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