[PATCH] D109460: [clang][Darwin] Try to guess the SDK root with xcrun when unspecified

[Louis Dionne via Phabricator via cfe-commits]

ldionne created this revision.
ldionne added a reviewer: arphaman.
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On Apple platforms, the base system does not contain headers (e.g. in /usr/include).
As a result, one needs to point Clang to those headers manually when running it,
which can be cumbersome. Instead, if the SDK root can't be inferred with the
usual logic (using the SDKROOT env var), try to guess it by running 'xcrun'.

This should provide a default that's sane most of the time when running clang
without impeding the ability for users to select the SDK of their choice with
the usual means.

http://llvm.org/PR45880


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D109460

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

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