[LLVMbugs] [Bug 18393] New: Invalid code accepted

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=18393

            Bug ID: 18393
           Summary: Invalid code accepted
           Product: clang
           Version: 3.3
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: pipping at exherbo.org
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

class Parent {
  void virtual f() = 0;
};

class Child : public Parent {
  void virtual f() {};
};

class X {
public:
  X() : v_() {}

  Parent g() const { return v_; }

private:
  Child const v_;
};

void f(Parent const &) {}

int main(void) {
  X x;
  f(x.g());
}

Rejected by gcc, (4.7.2) accepted by clang. I believe gcc is right since x.g()
returns a copy of a an abstract class, which doesn't make any sense.

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