Fix -Wmissing-variable-declarations regression.

This issue was introduced in r181677.

PR17349.

llvm-svn: 191339

clang/lib/Sema/SemaDecl.cpp

@@ -8683,7 +8683,7 @@ void Sema::CheckCompleteVariableDeclaration(VarDecl *var) {
   }
 
   if (var->isThisDeclarationADefinition() &&
-      var->isExternallyVisible() &&
+      var->isExternallyVisible() && var->hasLinkage() &&
       getDiagnostics().getDiagnosticLevel(
                        diag::warn_missing_variable_declarations,
                        var->getLocation())) {

clang/test/SemaCXX/warn-missing-variable-declarations.cpp

@@ -41,3 +41,9 @@ int CGood1::MGood1;
 namespace {
   int mgood4;
 }
+
+class C {
+  void test() {
+    static int x = 0; // no-warn
+  }
+};