[PATCH] D34440: [Clang] Expand response files before loading compilation database

[Vladimir Plyashkun via Phabricator via cfe-commits]

vladimir.plyashkun added a comment.

> If you want one unified format, the compilation database is it.

Is the `clang-tidy ... -- <args>` meant to be more or less a drop-in replacement for `clang <args>` (arguments-wise)? 
If yes, this expansion of response files here is an another step in this direction.

Our only concerns are the internal ones (instead of using our well-tested response file implementation, we have to do something similar but different with JSON-based compilation database format). 
Obviously, it is possible to use it, and if this patch won't be accepted, we would. 
But then, again, I see this change as a positive by itself and don't really understand why the compiler driver should expand response arguments and the fixed compilation database shouldn't.

As IDE developers we don't have full control on the format of compiler options. 
They come from users in free form which compiler can understand.
>From the implementation view it would be more transparent and efficient to transfer them in the original form to Clang-Tidy (instead of generating intermediate files).


Repository:
  rL LLVM

https://reviews.llvm.org/D34440