jyknight wrote:

> the main thing you care about is being able to turn off the canonicalisation 
> entirely with -no-canonical-prefix, is that right?

In terms of not breaking the Google buildsystem: yes. But if the question is 
whether the current patch would be fine if its behavior was also disabled by 
that flag: I'm not in favor of that.

While that _would_ address the breakage which brought this PR to my attention, 
my worry about ill-effects from canonicalization of the user's 
build-dir-relative file paths into absolute paths is a more general one.

https://github.com/llvm/llvm-project/pull/143520
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