ChuanqiXu added a comment.

>> In what mode will clang output #include information without erroring about 
>> missing .pcm files for import statements? -E -fdirectives-only perhaps? This 
>> further exacerbates the need for "fake" command lines and costs on platforms 
>> with expensive process execution.
>
> After we land D137526 <https://reviews.llvm.org/D137526>, we are able to do 
> this by: `-M -MF <dep_file> -E`.

BTW, if you are interested, it should be possible to use clang-scan-deps to get 
the make-style format information.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D139168/new/

https://reviews.llvm.org/D139168

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