[Bug c++/41020] [4.5 Regression] Can't declare an extern "C" friend.

["davek at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>]

------- Comment #5 from davek at gcc dot gnu dot org  2009-08-10 17:16 -------
(In reply to comment #4)
> It's irrelevant to this bug and is just me being more pedantic than -pedantic,
> however ... even with -pedantic GCC has always accepted stray semi-colons at
> namespace scope, but it's not valid.
> 
> At function scope a lone ';' is a valid expression-statement, but
> expression-statements are not allowed at namespace scope, only declarations
> are, and ';' is not a valid declaration.

  Well you learn something new every day!  Never realised that was a gnu
extension, but it sure is, comeau online choked on my testcase:

"ComeauTest.c", line 5: error: extra ";" ignored,
        In C: A function definition does not end with a semicolon
        In C++: A non-member function definition, extern "C" block,
                or namespace does not end with a semicolon
  };
   ^
  Anyway.  Consider the testcase amended.  :-)

$ cat friend.cxx

extern "C"
{
  int fork (void);
}

class frok
{
  int this_errno;
  friend int fork (void);
};

extern "C" int
fork (void)
{
  frok grouped;
  return grouped.this_errno;
}

$ g++-4 -c friend.cxx -o friend.o
friend.cxx:10:24: error: new declaration 'int fork()'
friend.cxx:4:7: error: ambiguates old declaration 'int fork()'
friend.cxx: In function 'int fork()':
friend.cxx:9:7: error: 'int frok::this_errno' is private
friend.cxx:17:18: error: within this context

$


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41020