[4.2] [IRGen] Make -emit-public-type-metadata-accessors a no-op.

include/swift/AST/DiagnosticsDriver.def

@@ -155,6 +155,10 @@ WARNING(warn_use_filelists_deprecated, none,
         "the option '-driver-use-filelists' is deprecated; use "
         "'-driver-filelist-threshold=0' instead", ())
 
+WARNING(warn_emit_public_type_metadata_accessors_deprecated, none,
+        "the option '-emit-public-type-metadata-accessors' is no longer "
+        "needed and is deprecated; consider removing it", ())
+
 REMARK(remark_using_batch_mode,none, "using batch mode", ())
 
 #ifndef DIAG_NO_UNDEF

include/swift/Basic/LangOptions.h

@@ -223,9 +223,6 @@ namespace swift {
     /// Enables key path resilience.
     bool EnableKeyPathResilience = false;
 
-    /// Enables public emission of private metadata accessors.
-    bool EmitPublicTypeMetadataAccessors = false;
-
     /// If set to true, the diagnosis engine can assume the emitted diagnostics
     /// will be used in editor. This usually leads to more aggressive fixit.
     bool DiagnosticsEditorMode = false;

include/swift/Option/Options.td

@@ -358,7 +358,7 @@ def warn_swift3_objc_inference : Flag<["-"], "warn-swift3-objc-inference">,
 def emit_public_type_metadata_accessors :
   Flag<["-"], "emit-public-type-metadata-accessors">,
   Flags<[FrontendOption]>,
-  HelpText<"Emit all type metadata accessors as public">;
+  HelpText<"Emit all type metadata accessors as public (deprecated: now does nothing)">;
 
 def Rpass_EQ : Joined<["-"], "Rpass=">,
   Flags<[FrontendOption]>,

lib/Driver/Driver.cpp

@@ -244,6 +244,10 @@ static void validateArgs(DiagnosticEngine &diags, const ArgList &args) {
   validateDebugInfoArgs(diags, args);
   validateCompilationConditionArgs(diags, args);
   validateAutolinkingArgs(diags, args);
+
+  if (args.hasArg(options::OPT_emit_public_type_metadata_accessors))
+    diags.diagnose(SourceLoc(),
+                   diag::warn_emit_public_type_metadata_accessors_deprecated);
 }
 
 std::unique_ptr<ToolChain>

lib/Driver/ToolChains.cpp

@@ -184,8 +184,6 @@ static void addCommonFrontendArgs(const ToolChain &TC,
                        options::OPT_warn_swift3_objc_inference_minimal,
                        options::OPT_warn_swift3_objc_inference_complete);
   inputArgs.AddLastArg(arguments, options::OPT_typo_correction_limit);
-  inputArgs.AddLastArg(arguments,
-                       options::OPT_emit_public_type_metadata_accessors);
   inputArgs.AddLastArg(arguments, options::OPT_enable_app_extension);
   inputArgs.AddLastArg(arguments, options::OPT_enable_testing);
   inputArgs.AddLastArg(arguments, options::OPT_g_Group);

lib/Frontend/CompilerInvocation.cpp

@@ -304,9 +304,6 @@ static bool ParseLangArgs(LangOptions &Opts, ArgList &Args,
     }
   }
 
-  Opts.EmitPublicTypeMetadataAccessors =
-    Args.hasArg(OPT_emit_public_type_metadata_accessors);
-
   Opts.EnableNSKeyedArchiverDiagnostics =
       Args.hasFlag(OPT_enable_nskeyedarchiver_diagnostics,
                    OPT_disable_nskeyedarchiver_diagnostics,

lib/IRGen/MetadataRequest.cpp

@@ -601,17 +601,6 @@ bool irgen::isTypeMetadataAccessTrivial(IRGenModule &IGM, CanType type) {
   return false;
 }
 
-/// Determine whether we should promote the type metadata access function
-/// for the given nominal type to "public".
-static bool promoteMetadataAccessFunctionToPublic(
-                                              const NominalTypeDecl *nominal) {
-  ASTContext &ctx = nominal->getASTContext();
-
-  // When -emit-public-type-metadata-accessors is provided, promote all
-  // of the metadata access functions to public.
-  return ctx.LangOpts.EmitPublicTypeMetadataAccessors;
-}
-
 /// Return the standard access strategy for getting a non-dependent
 /// type metadata object.
 MetadataAccessStrategy irgen::getTypeMetadataAccessStrategy(CanType type) {
@@ -644,12 +633,8 @@ MetadataAccessStrategy irgen::getTypeMetadataAccessStrategy(CanType type) {
     case FormalLinkage::PublicUnique:
       return MetadataAccessStrategy::PublicUniqueAccessor;
     case FormalLinkage::HiddenUnique:
-      if (promoteMetadataAccessFunctionToPublic(nominal))
-        return MetadataAccessStrategy::PublicUniqueAccessor;
       return MetadataAccessStrategy::HiddenUniqueAccessor;
     case FormalLinkage::Private:
-      if (promoteMetadataAccessFunctionToPublic(nominal))
-        return MetadataAccessStrategy::PublicUniqueAccessor;
       return MetadataAccessStrategy::PrivateAccessor;
 
     case FormalLinkage::PublicNonUnique:

test/Driver/emit_public_type_metadata_accessors.swift

@@ -0,0 +1,3 @@
+// RUN: %target-build-swift %s -emit-public-type-metadata-accessors 2>&1 | %FileCheck %s
+
+// CHECK: the option '-emit-public-type-metadata-accessors' is no longer needed and is deprecated; consider removing it