[cfe-dev] Emitting full clang command line into Debug Info

[Zachary Turner via cfe-dev]

For CodeView compatibility purposes, we need to be able to emit the full
command line of the clang driver into the debug info (cc1 command line is
fine, at least for CV purposes).

rnk@ tells me that he vaguely recalls some people needing this before, but
he can't recall if there's been an actual effort to submit patches to this
effect that got blocked on something, or if people are maintaining similar
patches downstream, or none of the above / something else.

Has anyone attempted something like this before?
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