sysroot.py: add support for darwin
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.
Differential Revision: https://reviews.llvm.org/D96958
GitOrigin-RevId: 0ec448194e2928a3d1dc2eceeb764c6e19bcec3e
4 files changed
