[PATCH] D136315: [clang][Darwin] Try to guess the SDK root with xcrun when unspecified

[Nico Weber via Phabricator via cfe-commits]

thakis added a comment.

This breaks oodles of tests for me: http://45.33.8.238/macm1/52994/step_7.txt

Is anyone else seeing this?

Also, independently of that, shouldn't this check that the _host_ os is macOS as well? Doesn't the current code try to run `xcrun` if I do `clang --target=arm64-apple-macos -x c -c /dev/null` on Linux? (Or am I misreading that?)


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D136315/new/

https://reviews.llvm.org/D136315