ben.boeckel added a comment.

In D139168#4025277 <https://reviews.llvm.org/D139168#4025277>, @ChuanqiXu wrote:

> Currently we will detect `-MF` in the command line and we will write the 
> make-format dependency output to the corresponding file once we find `-MF`.

When using `clang-scan-deps` with a compdb with multiple command lines, which 
depfile path will it use? Or must all agree on the same path and options? 
Because there should be a single one for all scanning that is performed (e.g., 
in batch mode). Is this really simpler than just adding `-MF` and friends to 
`clang-scan-deps` directly?


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https://reviews.llvm.org/D139168

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