[PATCH] D96958: sysroot.py: add support for darwin

[Nico Weber via Phabricator via llvm-commits]

thakis created this revision.
thakis added a reviewer: hans.
thakis requested review of this revision.
Herald added a project: LLVM.

This is a tiny bit messy because compiler-rt needs different sysroots for
macOS, iOS, etc. We want sysroot.py to create something that is a hermetic
representation of all build deps, so it needs to create a directory that
contains all needed SDKs, and these subdirectories are then passed to
cmake which passes each of these _subdirectories_ as different -isysroot
flags while building the runtime libraries.


https://reviews.llvm.org/D96958

Files:
  llvm/utils/gn/build/BUILD.gn
  llvm/utils/gn/build/mac_sdk.gni
  llvm/utils/gn/secondary/compiler-rt/BUILD.gn
  llvm/utils/sysroot.py

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