[PATCH] D104387: [clang-cl] Implement /external:I, /external:env, and EXTERNAL_INCLUDE support (PR36003)

[Hans Wennborg via Phabricator via cfe-commits]

hans created this revision.
hans added a reviewer: thakis.
Herald added a subscriber: dang.
hans requested review of this revision.
Herald added a project: clang.

This patch does three things:

- Map the /external:I flag to -isystem

- Add support for the /external:env:<var> flag which reads system include paths for the <var> environment variable

- Pick up system include dirs EXTERNAL_INCLUDE in addition to the old INCLUDE environment variable.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D104387

Files:
  clang/include/clang/Driver/Options.td
  clang/lib/Driver/ToolChains/MSVC.cpp
  clang/test/Driver/cl-include.c
  clang/test/Driver/cl-options.c

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