test/CodeGenCXX/rtti-linkage.cpp

// RUN: %clang_cc1 %s -I%S -triple=x86_64-apple-darwin10 -emit-llvm -o - | FileCheck %s
#include <typeinfo>

// CHECK: _ZTS1B = constant
// CHECK: _ZTS1A = weak_odr constant
// CHECK: _ZTI1A = weak_odr constant
// CHECK: _ZTI1B = constant
// CHECK: _ZTSP1C = internal constant
// CHECK: _ZTIP1C = internal constant
// CHECK: _ZTSPP1C = internal constant
// CHECK: _ZTIPP1C = internal constant
// A has no key function, so its RTTI data should be weak_odr.
struct A { };

// B has a key function defined in the translation unit, so the RTTI data should
// be emitted in this translation unit and have external linkage.
struct B : A {
  virtual void f();
};
void B::f() { }

// C is an incomplete class type, so any direct or indirect pointer types should have 
// internal linkage, as should the type info for C itself (FIXME).
struct C;

void f() {
  (void)typeid(C*);
  (void)typeid(C**);
  
}