[PATCH] D40998: [driver][darwin] Take the OS version specified in "-target" as the target OS instead of inferring it from SDK / environment

[Alex Lorenz via Phabricator via cfe-commits]

arphaman updated this revision to Diff 126243.
arphaman added a comment.

I rewrote the patch on top of https://reviews.llvm.org/D41035 as suggested by Duncan.

I also changed some of the semantics:

- If `-target` is used with `Darwin` OS, then the OS will be determined using the old semantics.
- If `-target` specifies a concrete OS (even without version), that OS is **always** used, no matter what other options/environment variables are given. The driver will warn about superfluous `-m<os>-version-min` and environment variables in this case.


Repository:
  rC Clang

https://reviews.llvm.org/D40998

Files:
  include/clang/Basic/DiagnosticDriverKinds.td
  lib/Driver/ToolChains/Darwin.cpp
  test/Driver/darwin-version.c
  test/Driver/objc-weak.m
  test/Driver/pic.c
  test/Driver/unavailable_aligned_allocation.cpp

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