[darwin] parse the SDK settings from SDKSettings.json if it exists and

pass in the -target-sdk-version to the compiler and backend

This commit 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= option. This option is then used to set the appropriate
SDK Version module metadata introduced in r349119.

Note: I had to adjust the two ast tests as the SDKROOT environment variable
on macOS caused SDK version to be picked up for the compilation of source file
but not the AST.

rdar://45774000

Differential Revision: https://reviews.llvm.org/D55673

llvm-svn: 349380

1 files changed, 3 insertions, 0 deletions

diff --git a/clang/lib/CodeGen/ModuleBuilder.cpp b/clang/lib/CodeGen/ModuleBuilder.cpp
index 1264893ec13..c0a37698e76 100644
--- a/clang/lib/CodeGen/ModuleBuilder.cpp
+++ b/clang/lib/CodeGen/ModuleBuilder.cpp
@@ -132,6 +132,9 @@ namespace {
 
       M->setTargetTriple(Ctx->getTargetInfo().getTriple().getTriple());
       M->setDataLayout(Ctx->getTargetInfo().getDataLayout());
+      const auto &SDKVersion = Ctx->getTargetInfo().getSDKVersion();
+      if (!SDKVersion.empty())
+        M->setSDKVersion(SDKVersion);
       Builder.reset(new CodeGen::CodeGenModule(Context, HeaderSearchOpts,
                                                PreprocessorOpts, CodeGenOpts,
                                                *M, Diags, CoverageInfo));