Index: include/clang/Driver/ToolChain.h
===================================================================
--- include/clang/Driver/ToolChain.h
+++ include/clang/Driver/ToolChain.h
@@ -366,9 +366,6 @@
   /// SupportsProfiling - Does this tool chain support -pg.
   virtual bool SupportsProfiling() const { return true; }

-  /// Does this tool chain support Objective-C garbage collection.
-  virtual bool SupportsObjCGC() const { return true; }
-
   /// Complain if this tool chain doesn't support Objective-C ARC.
   virtual void CheckObjCARC() const {}

Index: lib/Driver/ToolChains/BareMetal.h
===================================================================
--- lib/Driver/ToolChains/BareMetal.h
+++ lib/Driver/ToolChains/BareMetal.h
@@ -37,7 +37,6 @@
   bool isPIEDefault() const override { return false; }
   bool isPICDefaultForced() const override { return false; }
   bool SupportsProfiling() const override { return false; }
-  bool SupportsObjCGC() const override { return false; }

   RuntimeLibType GetDefaultRuntimeLibType() const override {
     return ToolChain::RLT_CompilerRT;
Index: lib/Driver/ToolChains/Cuda.h
===================================================================
--- lib/Driver/ToolChains/Cuda.h
+++ lib/Driver/ToolChains/Cuda.h
@@ -156,7 +156,6 @@
   bool isPIEDefault() const override { return false; }
   bool isPICDefaultForced() const override { return false; }
   bool SupportsProfiling() const override { return false; }
-  bool SupportsObjCGC() const override { return false; }
   bool IsMathErrnoDefault() const override { return false; }

   void AddCudaIncludeArgs(const llvm::opt::ArgList &DriverArgs,
Index: lib/Driver/ToolChains/Darwin.h
===================================================================
--- lib/Driver/ToolChains/Darwin.h
+++ lib/Driver/ToolChains/Darwin.h
@@ -245,8 +245,6 @@

   bool SupportsProfiling() const override;

-  bool SupportsObjCGC() const override { return false; }
-
   bool UseDwarfDebugFlags() const override;

   bool UseSjLjExceptions(const llvm::opt::ArgList &Args) const override {
@@ -455,8 +453,6 @@
     return 0;
   }

-  bool SupportsObjCGC() const override;
-
   void CheckObjCARC() const override;

   bool UseSjLjExceptions(const llvm::opt::ArgList &Args) const override;
Index: lib/Driver/ToolChains/Darwin.cpp
===================================================================
--- lib/Driver/ToolChains/Darwin.cpp
+++ lib/Driver/ToolChains/Darwin.cpp
@@ -2041,8 +2041,6 @@
   }
 }

-bool Darwin::SupportsObjCGC() const { return isTargetMacOS(); }
-
 void Darwin::CheckObjCARC() const {
   if (isTargetIOSBased() || isTargetWatchOSBased() ||
       (isTargetMacOS() && !isMacosxVersionLT(10, 6)))
Index: lib/Driver/ToolChains/WebAssembly.h
===================================================================
--- lib/Driver/ToolChains/WebAssembly.h
+++ lib/Driver/ToolChains/WebAssembly.h
@@ -49,7 +49,6 @@
   bool isPICDefaultForced() const override;
   bool IsIntegratedAssemblerDefault() const override;
   bool hasBlocksRuntime() const override;
-  bool SupportsObjCGC() const override;
   bool SupportsProfiling() const override;
   bool HasNativeLLVMSupport() const override;
   void addClangTargetOptions(const llvm::opt::ArgList &DriverArgs,
Index: lib/Driver/ToolChains/WebAssembly.cpp
===================================================================
--- lib/Driver/ToolChains/WebAssembly.cpp
+++ lib/Driver/ToolChains/WebAssembly.cpp
@@ -98,9 +98,6 @@

 bool WebAssembly::IsIntegratedAssemblerDefault() const { return true; }

-// TODO: Support Objective C stuff.
-bool WebAssembly::SupportsObjCGC() const { return false; }
-
 bool WebAssembly::hasBlocksRuntime() const { return false; }

 // TODO: Support profiling.