Revert r305678: [driver][macOS] Pick the system version for the

deployment target if the SDK is newer than the system

This commit also reverts follow-up commits r305680 and r305685 that have
buildbot fixes.

The change in r305678 wasn't correct because it relied on
`llvm::sys::getProcessTriple`, which uses a pre-configured OS version. We should
lookup the actual macOS version of the system on which the compiler is running.

llvm-svn: 305891

1 files changed, 1 insertions, 22 deletions

diff --git a/clang/lib/Driver/ToolChains/Darwin.cpp b/clang/lib/Driver/ToolChains/Darwin.cpp
index b47df960dd9..e41b50c40b2 100644
--- a/clang/lib/Driver/ToolChains/Darwin.cpp
+++ b/clang/lib/Driver/ToolChains/Darwin.cpp
@@ -1118,27 +1118,6 @@ void DarwinClang::AddLinkRuntimeLibArgs(const ArgList &Args,
   }
 }
 
-/// Returns the most appropriate macOS target version for the current process.
-///
-/// If the macOS SDK version is the same or earlier than the system version,
-/// then the SDK version is returned. Otherwise the system version is returned.
-static std::string getSystemOrSDKMacOSVersion(StringRef MacOSSDKVersion) {
-  unsigned Major, Minor, Micro;
-  llvm::Triple SystemTriple(llvm::sys::getProcessTriple());
-  if (!SystemTriple.isMacOSX())
-    return MacOSSDKVersion;
-  SystemTriple.getMacOSXVersion(Major, Minor, Micro);
-  VersionTuple SystemVersion(Major, Minor, Micro);
-  bool HadExtra;
-  if (!Driver::GetReleaseVersion(MacOSSDKVersion, Major, Minor, Micro,
-                                 HadExtra))
-    return MacOSSDKVersion;
-  VersionTuple SDKVersion(Major, Minor, Micro);
-  if (SDKVersion > SystemVersion)
-    return SystemVersion.getAsString();
-  return MacOSSDKVersion;
-}
-
 void Darwin::AddDeploymentTarget(DerivedArgList &Args) const {
   const OptTable &Opts = getDriver().getOpts();
 
@@ -1231,7 +1210,7 @@ void Darwin::AddDeploymentTarget(DerivedArgList &Args) const {
                 SDK.startswith("iPhoneSimulator"))
               iOSTarget = Version;
             else if (SDK.startswith("MacOSX"))
-              OSXTarget = getSystemOrSDKMacOSVersion(Version);
+              OSXTarget = Version;
             else if (SDK.startswith("WatchOS") ||
                      SDK.startswith("WatchSimulator"))
               WatchOSTarget = Version;