inglorion added a comment. This is similar to r254927 for the clang driver, and reuses the tests from that commit for the backend part. On the frontend, it differs in that clang-cl does not support -x (per the comment in clang/lib/Driver/Driver.cpp line 2068: "// No driver mode exposes -x and /TC or /TP; we don't support mixing them.") Instead of requiring -x ir, the behavior added to clang-cl here is to expect that what would be detected as a native object file based on file extension is really a bitcode file. If it isn't, the backend will cause us to say "error: Invalid bitcode signature", which I think is adequate as a diagnostic.
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