More work on diagnosing abstract classes. We can now handle cases like

class C {
  void g(C c);

  virtual void f() = 0;
};

In this case, C is not known to be abstract when doing semantic analysis on g. This is done by recursively traversing the abstract class and checking the types of member functions. 

llvm-svn: 67594

1 files changed, 13 insertions, 1 deletions

diff --git a/clang/test/SemaCXX/abstract.cpp b/clang/test/SemaCXX/abstract.cpp
index 08baacc49d6..9c8e2dc9774 100644
--- a/clang/test/SemaCXX/abstract.cpp
+++ b/clang/test/SemaCXX/abstract.cpp
@@ -51,4 +51,16 @@ void t5(void (*)(C)); // expected-error {{parameter type 'C' is an abstract clas
 typedef void (*Func)(C); // expected-error {{parameter type 'C' is an abstract class}}
 void t6(Func);
 
-
+class F {
+    F a() { } // expected-error {{return type 'F' is an abstract class}}
+    
+    class D {
+        void f(F c); // expected-error {{parameter type 'F' is an abstract class}}
+    };
+
+    union U {
+        void u(F c); // expected-error {{parameter type 'F' is an abstract class}}
+    };
+    
+    virtual void f() = 0; // expected-note {{pure virtual function 'f'}}
+};