[PATCH] D27299: [Sema] C++11 opaque enums should avoid the "case value not in enumerated type" switch warning

[Alex Lorenz via Phabricator via cfe-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rL289055: [Sema] Avoid "case value not in enumerated type" warning for C++11 opaque enums (authored by arphaman).

Changed prior to commit:
  https://reviews.llvm.org/D27299?vs=79892&id=80757#toc

Repository:
  rL LLVM

https://reviews.llvm.org/D27299

Files:
  cfe/trunk/lib/Sema/SemaStmt.cpp
  cfe/trunk/test/SemaCXX/switch.cpp


Index: cfe/trunk/lib/Sema/SemaStmt.cpp
===================================================================
--- cfe/trunk/lib/Sema/SemaStmt.cpp
+++ cfe/trunk/lib/Sema/SemaStmt.cpp
@@ -1070,7 +1070,8 @@
     const EnumType *ET = CondTypeBeforePromotion->getAs<EnumType>();
 
     // If switch has default case, then ignore it.
-    if (!CaseListIsErroneous  && !HasConstantCond && ET) {
+    if (!CaseListIsErroneous && !HasConstantCond && ET &&
+        ET->getDecl()->isCompleteDefinition()) {
       const EnumDecl *ED = ET->getDecl();
       EnumValsTy EnumVals;
 
Index: cfe/trunk/test/SemaCXX/switch.cpp
===================================================================
--- cfe/trunk/test/SemaCXX/switch.cpp
+++ cfe/trunk/test/SemaCXX/switch.cpp
@@ -100,3 +100,33 @@
   }
   template void f(S); // expected-note {{instantiation of}}
 }
+
+// rdar://29230764
+namespace OpaqueEnumWarnings {
+
+enum Opaque : int;
+enum class OpaqueClass : int;
+
+enum class Defined : int;
+enum class Defined : int { a };
+
+void test(Opaque o, OpaqueClass oc, Defined d) {
+  // Don't warn that case value is not present in opaque enums.
+  switch (o) {
+  case (Opaque)1:
+    break;
+  }
+  switch (oc) {
+  case (OpaqueClass)1:
+    break;
+  }
+
+  switch (d) {
+  case Defined::a:
+    break;
+  case (Defined)2: // expected-warning {{case value not in enumerated type 'OpaqueEnumWarnings::Defined'}}
+    break;
+  }
+}
+
+}


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