Rework the way we handle constructor decls to be less hacky and fix PR3948 completely.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@70516 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaDecl.cpp b/lib/Sema/SemaDecl.cpp
index 2381c62..37f4985 100644
--- a/lib/Sema/SemaDecl.cpp
+++ b/lib/Sema/SemaDecl.cpp
@@ -2035,6 +2035,18 @@
       
     isVirtualOkay = true;
   } else if (DC->isRecord()) {
+    // If the of the function is the same as the name of the record, then this
+    // must be an invalid constructor that has a return type. 
+    // (The parser checks for a return type and makes the declarator a 
+    // constructor if it has no return type).
+    // must have an invalid constructor that has a return type 
+    if (Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){
+      Diag(D.getIdentifierLoc(), diag::err_constructor_return_type)
+        << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc())
+        << SourceRange(D.getIdentifierLoc());
+      return 0;
+    }
+    
     // This is a C++ method declaration.
     NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC),
                                   D.getIdentifierLoc(), Name, R,
diff --git a/lib/Sema/SemaDeclCXX.cpp b/lib/Sema/SemaDeclCXX.cpp
index e9b7fb0..6e00488 100644
--- a/lib/Sema/SemaDeclCXX.cpp
+++ b/lib/Sema/SemaDeclCXX.cpp
@@ -1294,19 +1294,6 @@
     D.setInvalidType();
     SC = FunctionDecl::None;
   }
-  if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) {
-    // Constructors don't have return types, but the parser will
-    // happily parse something like:
-    //
-    //   class X {
-    //     float X(float);
-    //   };
-    //
-    // The return type will be eliminated later.
-    Diag(D.getIdentifierLoc(), diag::err_constructor_return_type)
-      << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc())
-      << SourceRange(D.getIdentifierLoc());
-  }
   
   DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun;
   if (FTI.TypeQuals != 0) {