Hi there,

We're continuing to work on making Firefox build with clang-cl in more 
configurations, and one of my colleagues recently wondered[1] if we could 
generate Makefile dependencies with clang-cl the same way we would with clang 
or gcc (-MP -MD etc) instead of using the wrapper script[2] that we use with 
MSVC that parses the output of -showIncludes. Passing these options to clang-cl 
with `-Xclang` doesn't seem to work, however:

$ clang-cl -Fohello.obj -c hello.cpp -Xclang -MP -Xclang -MD -Xclang -MF 
-Xclang bar
error: unknown argument: '-MD'
error: unknown argument: '-MF'

Is this something we could make work?

Regards,
-Ted

1. https://bugzilla.mozilla.org/show_bug.cgi?id=1340588
2. 
https://dxr.mozilla.org/mozilla-central/source/python/mozbuild/mozbuild/action/cl.py
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