[PATCH] D120727: [libc++] Overhaul how we select the ABI library

[Louis Dionne via Phabricator via cfe-commits]

ldionne created this revision.
Herald added a subscriber: arichardson.
ldionne requested review of this revision.
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This patch overhauls how we pick up the ABI library. Instead of setting
ad-hoc flags, it creates interface targets that can be linked against by
the rest of the build, which is easier to follow and extend to support
new ABI libraries. It also adds a new ABI library called "system-libcxxabi",
which represents linking against a LLVM libc++abi already installed on the
system, and solves existing issues when trying to build against a system
libc++abi outside of the now-unsupported standalone build.

This is intended to be a NFC change, however there are some additional
simplifications and improvements we can make in the future that would
require a slight behavior change.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D120727

Files:
  clang/cmake/caches/CrossWinToARMLinux.cmake
  libcxx/CMakeLists.txt
  libcxx/cmake/Modules/HandleLibCXXABI.cmake
  libcxx/docs/BuildingLibcxx.rst
  libcxx/include/CMakeLists.txt
  libcxx/lib/abi/CMakeLists.txt
  libcxx/src/CMakeLists.txt
  libcxx/test/CMakeLists.txt
  libcxx/test/configs/legacy.cfg.in
  libcxx/utils/libcxx/test/config.py

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