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Otherwise, even specifying a runtime root different from the library we're linking against won't work -- the library we're linking against is always used. This is undesirable if we try testing something like linking against a recent libc++.dylib but running the tests against an older version (the back-deployment use case). git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@349171 91177308-0d34-0410-b5e6-96231b3b80d8