[all-commits] [llvm/llvm-project] 3063a5: [clang-cl] Implement /external:I, /external:env, a...

[Hans via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 3063a5472266f05add4e5b85f34141ba2e66fa2e
      https://github.com/llvm/llvm-project/commit/3063a5472266f05add4e5b85f34141ba2e66fa2e
  Author: Hans Wennborg <hans at chromium.org>
  Date:   2021-06-21 (Mon, 21 Jun 2021)

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

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

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 from the <var> environment variable

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

Differential revision: https://reviews.llvm.org/D104387