whisperity added a comment.

@dblaikie I have created a test, but unfortunately `%clang_cpp` in LIT invokes 
`clang --driver-mode=cpp` which is not the same as if `clang++` is called. I'm 
trying to construct the following command-line

`clang++ -fmodules-ts -fprebuilt-module-path=%t/mods --precompile -c file.cppm 
-o file.pcm`

However, using `%clang_cc1` I can't get it to accept `--precompile` as a valid 
argument, and using `%clang_cpp` I get an "unused argument" warning for 
`--precompile` and the output file is just a preprocessed output (like `-E`), 
which will, of course, cause errors, but not the errors I am wanting to test 
about.


Repository:
  rC Clang

https://reviews.llvm.org/D53334



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