Revert r163078 per chandlerc's request.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@163145 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 20 insertions, 42 deletions

diff --git a/lib/Sema/SemaDeclAttr.cpp b/lib/Sema/SemaDeclAttr.cpp
index bf1c14338d..50d1117599 100644
--- a/lib/Sema/SemaDeclAttr.cpp
+++ b/lib/Sema/SemaDeclAttr.cpp
@@ -4149,50 +4149,20 @@ static void handleUuidAttr(Sema &S, Decl *D, const AttributeList &Attr) {
     S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "uuid";
 }
 
-static bool hasOtherInheritanceAttr(Decl *D, AttributeList::Kind Kind,
-    int& Existing) {
-  if (Kind != AttributeList::AT_SingleInheritance &&
-      D->hasAttr<SingleInheritanceAttr>()) {
-    Existing = 0;
-    return true;
-  }
-  else if (Kind != AttributeList::AT_MultipleInheritance &&
-      D->hasAttr<MultipleInheritanceAttr>()) {
-    Existing = 1;
-    return true;
-  }
-  else if (Kind != AttributeList::AT_VirtualInheritance &&
-      D->hasAttr<VirtualInheritanceAttr>()) {
-    Existing = 2;
-    return true;
-  }
-  return false;
-}
-
 static void handleInheritanceAttr(Sema &S, Decl *D, const AttributeList &Attr) {
-  if (!S.LangOpts.MicrosoftExt) {
+  if (S.LangOpts.MicrosoftExt) {
+    AttributeList::Kind Kind = Attr.getKind();
+    if (Kind == AttributeList::AT_SingleInheritance)
+      D->addAttr(
+          ::new (S.Context) SingleInheritanceAttr(Attr.getRange(), S.Context));
+    else if (Kind == AttributeList::AT_MultipleInheritance)
+      D->addAttr(
+          ::new (S.Context) MultipleInheritanceAttr(Attr.getRange(), S.Context));
+    else if (Kind == AttributeList::AT_VirtualInheritance)
+      D->addAttr(
+          ::new (S.Context) VirtualInheritanceAttr(Attr.getRange(), S.Context));
+  } else
     S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName();
-    return;
-  }
-
-  AttributeList::Kind Kind = Attr.getKind();
-
-  int Existing;
-  if (hasOtherInheritanceAttr(D->getCanonicalDecl(), Kind, Existing)) {
-      S.Diag(Attr.getLoc(), diag::warn_ms_inheritance_already_declared) << Existing;
-      return;
-  }
-
-  if (Kind == AttributeList::AT_SingleInheritance) {
-    D->addAttr(
-        ::new (S.Context) SingleInheritanceAttr(Attr.getRange(), S.Context));
-  } else if (Kind == AttributeList::AT_MultipleInheritance) {
-    D->addAttr(
-        ::new (S.Context) MultipleInheritanceAttr(Attr.getRange(), S.Context));
-  } else if (Kind == AttributeList::AT_VirtualInheritance) {
-    D->addAttr(
-        ::new (S.Context) VirtualInheritanceAttr(Attr.getRange(), S.Context));
-  }
 }
 
 static void handlePortabilityAttr(Sema &S, Decl *D, const AttributeList &Attr) {
diff --git a/lib/Sema/SemaType.cpp b/lib/Sema/SemaType.cpp
index 68cd5cdcf8..82dccfa5f4 100644
--- a/lib/Sema/SemaType.cpp
+++ b/lib/Sema/SemaType.cpp
@@ -1583,6 +1583,14 @@ QualType Sema::BuildMemberPointerType(QualType T, QualType Class,
     return QualType();
   }
 
+  // In the Microsoft ABI, the class is allowed to be an incomplete
+  // type. In such cases, the compiler makes a worst-case assumption.
+  // We make no such assumption right now, so emit an error if the
+  // class isn't a complete type.
+  if (Context.getTargetInfo().getCXXABI() == CXXABI_Microsoft &&
+      RequireCompleteType(Loc, Class, diag::err_incomplete_type))
+    return QualType();
+
   return Context.getMemberPointerType(T, Class.getTypePtr());
 }