r258720 - [MSVC Compat] Only warn for unknown clang-cl arguments

[Renato Golin via cfe-commits]

Hi,

So, the results I'm getting on that RUN list is:

1. clang -cake-is-lie etc.

Runs ok, prints expected error messages, returns 1.

2. clang-cl -cake-is-lie

I've hit an assert on
llvm/lib/Target/AArch64/MCTargetDesc/AArch64MCTargetDesc.cpp:80:
llvm::MCCodeGenInfo* createAArch64MCCodeGenInfo(const llvm::Triple&,
llvm::Reloc::Model, llvm::CodeModel::Model, llvm::CodeGenOpt::Level):
Assertion `(TT.isOSBinFormatELF() || TT.isOSBinFormatMachO()) && "Only
expect Darwin and ELF targets"' failed.

Returns with error code 254, which is the one the bot was complaining
about. Script attached.

3. Same, with -Werror=unknown-argument

Runs ok, prints expected error messages, returns 1.

4. Same, with -Wno-unknown-argument

Fails on "// SILENT-NOT: error", since Clang's -v output contains:
"-ferror-limit 19". I think you'll have to be more specific there. I'm
not sure how this passed anywhere.

5. Clang -S

Get the expected warning, returns 0.

Hope that helps.

cheers,
--renato
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