mhjacobson added a comment.

In D107672#2932413 <https://reviews.llvm.org/D107672#2932413>, @mhjacobson 
wrote:

> At first glance, I think you're right: avr-gcc does expect avr-libc to be 
> relative to itself.  That seems slightly weird to me (since avr-libc is 
> technically separate from GCC), but OK.

OK, after looking at the GCC source, I see there's nothing specific to 
avr-libc.  It's just that GCC basically tries to look in 
`$PREFIX/[machine/]lib`, where `$PREFIX` is actually the path to GCC, 
dot-dotted up to where it thinks the prefix lives, to allow for the possibility 
that the whole prefix was relocated.

So, @MaskRay, correct me if I'm wrong: it seems like you're suggesting that we 
use something derived from the `GCCInstallationDetector` to find libc?  Is 
there another platform's driver I can look at as an example?


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D107672/new/

https://reviews.llvm.org/D107672

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