From 34bc6e5ee401508a24cddd827c53b514dceb2347 Mon Sep 17 00:00:00 2001
From: Douglas Gregor <dgregor@apple.com>
Date: Fri, 23 Sep 2011 19:04:03 +0000
Subject: When checking for weak vtables, check whether the actual definition
 of the key function is inline, rather than the original declaration. Perhaps
 FunctionDecl::isInlined() is poorly named. Fixes <rdar://problem/9979458>.

llvm-svn: 140400
---
 clang/lib/Sema/SemaDeclCXX.cpp           |  5 ++++-
 clang/test/SemaCXX/warn-weak-vtables.cpp | 27 +++++++++++++++++++++++++++
 2 files changed, 31 insertions(+), 1 deletion(-)

(limited to 'clang')

diff --git a/clang/lib/Sema/SemaDeclCXX.cpp b/clang/lib/Sema/SemaDeclCXX.cpp
index ef8719c48e5..0727bbd36c6 100644
--- a/clang/lib/Sema/SemaDeclCXX.cpp
+++ b/clang/lib/Sema/SemaDeclCXX.cpp
@@ -10302,7 +10302,10 @@ bool Sema::DefineUsedVTables() {
     // Optionally warn if we're emitting a weak vtable.
     if (Class->getLinkage() == ExternalLinkage &&
         Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) {
-      if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined()))
+      const FunctionDecl *KeyFunctionDef = 0;
+      if (!KeyFunction || 
+          (KeyFunction->hasBody(KeyFunctionDef) && 
+           KeyFunctionDef->isInlined()))
         Diag(Class->getLocation(), diag::warn_weak_vtable) << Class;
     }
   }
diff --git a/clang/test/SemaCXX/warn-weak-vtables.cpp b/clang/test/SemaCXX/warn-weak-vtables.cpp
index c0cfd74a3e5..912622f5a7e 100644
--- a/clang/test/SemaCXX/warn-weak-vtables.cpp
+++ b/clang/test/SemaCXX/warn-weak-vtables.cpp
@@ -29,3 +29,30 @@ void uses(A &a, B<int> &b, C &c) {
   b.f();
   c.f();
 }
+
+// <rdar://problem/9979458>
+class Parent {
+public:
+  Parent() {}
+  virtual ~Parent();
+  virtual void * getFoo() const = 0;    
+};
+  
+class Derived : public Parent {
+public:
+  Derived();
+  void * getFoo() const;
+};
+
+class VeryDerived : public Derived { // expected-warning{{'VeryDerived' has no out-of-line virtual method definitions; its vtable will be emitted in every translation unit}}
+public:
+  void * getFoo() const { return 0; }
+};
+
+Parent::~Parent() {}
+
+void uses(Parent &p, Derived &d, VeryDerived &vd) {
+  p.getFoo();
+  d.getFoo();
+  vd.getFoo();
+}
-- 
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