commit 0a9f6969d570a4c3a15c264aa6554c8bbf68583c
author JF Bastien <jfbastien@apple.com> Wed Jan 16 22:22:38 2019 +0000
committer JF Bastien <jfbastien@apple.com> Wed Jan 16 22:22:38 2019 +0000
tree 0a3f27f3d06e1ec1a65f1d700456deb37e76e27f
parent 0c86984524fe6ca6eec2d6893a953e54c9c6422f

[NFC] Factor out + document build requirements

Summary: This change factors out compiler checking / warning, and documents LLVM_FORCE_USE_OLD_TOOLCHAIN. It doesn't introduce any functional changes nor policy changes, these will come late.

Subscribers: mgorny, jkorous, dexonsmith, llvm-commits

Differential Revision: https://reviews.llvm.org/D56799

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@351387 91177308-0d34-0410-b5e6-96231b3b80d8