[PATCH] D55673: [darwin] parse the SDK settings from SDKSettings.json if it exists and pass in the -target-sdk-version to the compiler and backend

[Alex Lorenz via Phabricator via cfe-commits]

arphaman created this revision.
arphaman added reviewers: steven_wu, ab, dexonsmith.
Herald added subscribers: jkorous, mgorny.

This patch is a follow-up to the LLVM SDK Version metadata support: https://reviews.llvm.org/D55612.

This patch adds support for reading the `SDKSettings.json` file in the Darwin driver. This file is used by the driver to determine the SDK's version, and it uses that information to pass it down to the compiler using the new `-target-sdk-version=`. This option is then used to set the appropriate `SDK Version` module metadata introduced in https://reviews.llvm.org/D55612.


Repository:
  rC Clang

https://reviews.llvm.org/D55673

Files:
  include/clang/Basic/DiagnosticDriverKinds.td
  include/clang/Basic/TargetInfo.h
  include/clang/Basic/TargetOptions.h
  include/clang/Driver/CC1Options.td
  include/clang/Driver/DarwinSDKInfo.h
  lib/CodeGen/ModuleBuilder.cpp
  lib/Driver/CMakeLists.txt
  lib/Driver/DarwinSDKInfo.cpp
  lib/Driver/ToolChains/Darwin.cpp
  lib/Frontend/CompilerInvocation.cpp
  test/CodeGen/darwin-sdk-version.c
  test/Driver/Inputs/MacOSX10.14.sdk/SDKSettings.json
  test/Driver/darwin-sdk-version.c

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