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From: "scovich at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/58022] [4.8 Regression] Compiler rejects abstract class in template class with friend operator<<
Date: Mon, 29 Jul 2013 20:30:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58022

--- Comment #3 from Ryan Johnson <scovich at gmail dot com> ---
(In reply to Paolo Carlini from comment #1)
> Please try to reduce the testcase further, no includes. You have a number of
> options here: http://gcc.gnu.org/wiki/A_guide_to_testcase_reduction

Sorry, I thought <ostream> was an important part of the bug and did some work
to put it back in... Here's the fully reduced case:

// <<<--- begin bug.cpp --->>>
template<typename _CharT>
class basic_ostream;

typedef basic_ostream<char> ostream;

template<typename T>
basic_ostream<T>& operator<<(basic_ostream<T>&, T);

template <class T> class foo;

template <class T> ostream & operator<<(ostream&, const foo<T>&);

template <class T> class foo  {
    friend ostream& operator<< <T> (ostream&, const foo<T>&);
};

class bar;

foo<bar> fb;

class bar { virtual void baz()=0; };
// <<<--- end bug.cpp --->>>