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From: "vova7890 at mail dot ru" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/58263] [feature request] friend class $UndefinedClass
Date: Wed, 28 Aug 2013 16:32:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58263

--- Comment #2 from vova7890 <vova7890 at mail dot ru> ---
(In reply to Jonathan Wakely from comment #1)
> Do we warn in A.cc that B is not defined? It is defined in another header,
> but that isn't included by A.cc because it isn't needed.



We warn about implicit friend class MyClas2. For example, we wrong writed class
name(as in example MyClas2 -> MyClass2, missed the letter "s" in the word
Class), try to compile that and see:

[vova7890@localhost tmp]$ g++ -O2 main.cpp
main.cpp: In member function 'void MyClass2::need(MyClass1*)':
main.cpp:10:9: error: 'void MyClass1::help()' is private
    void help();
         ^
main.cpp:18:16: error: within this context
       cl->help();   // error: is private!!


But, we don`t understand why it`s private, because we think that we correctly
writed class name(friend class MyClass2), and do not see where is the bug
exactly. But, if compiler say as, about implicit friend class MyClas2, like
this:

[vova7890@localhost tmp]$ g++ -O2 main.cpp
main.cpp:8:12: warning: implicit declaration of friend 'MyClas2'
    friend class MyClas2;
                 ^
main.cpp: In member function 'void MyClass2::need(MyClass1*)':
main.cpp:10:9: error: 'void MyClass1::help()' is private
    void help();
         ^
main.cpp:18:16: error: within this context
       cl->help();   // error: is private!!


we see where is exactly issue, and just correct that stupid typo.