tree dda29ad50105968f275599993d14b41be5ac975c
parent 16f27fb3e9a4d061864859279b62392d602d2698
author Bruno Cardoso Lopes <bruno.cardoso@gmail.com> 1537290673 +0000
committer Bruno Cardoso Lopes <bruno.cardoso@gmail.com> 1537290673 +0000

[Modules] Add platform and environment features to requires clause

Allows module map writers to add build requirements based on
platform/os. This helps when target features and language dialects
aren't enough to conditionalize building a module, among other things,
it allow module maps for different platforms to live in the same file.

rdar://problem/43909745

Differential Revision: https://reviews.llvm.org/D51910

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@342499 91177308-0d34-0410-b5e6-96231b3b80d8