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

[Caleb Zulawski via Phabricator via cfe-commits]

calebzulawski updated this revision to Diff 469859.
calebzulawski added a comment.

Changed to not invoke `xcrun` if the SDK name can't be determined.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D136315/new/

https://reviews.llvm.org/D136315

Files:
  clang/lib/Driver/ToolChains/Darwin.cpp
  clang/test/Driver/darwin-sdkroot.c

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