[PATCH] D96868: build: Add LLVM_WINSYSROOT to make setting /winsysroot easy on Win

[Nico Weber via Phabricator via llvm-commits]

thakis created this revision.
thakis added a reviewer: hans.
Herald added a subscriber: mgorny.
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Also add a script for sysroot management. For now, it can only create
fake sysroots that just symlink to local folders. This is useful for
testing.


https://reviews.llvm.org/D96868

Files:
  llvm/cmake/modules/HandleLLVMOptions.cmake
  llvm/utils/gn/build/BUILD.gn
  llvm/utils/sysroot.py

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