[Bug c++/60565] Bogus not-in-scope error

[patrick at parcs dot ath.cx]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60565

--- Comment #4 from patrick at parcs dot ath.cx ---
(In reply to Jonathan Wakely from comment #3)
> (In reply to patrick from comment #1)
> > Er, sorry, the call to "foo ()" within main ought to be "B::foo ()".
> 
> OK, in that case you need to fix the declaration of B::foo() if you want to
> call it.  I think G++ is ignoring the inconsistent declaration of B::foo().
> I'm not sure if that's correct, or whether it should give an error at that
> point.

I think the compiler should not ignore the ill-formed declaration because 1)
the diagnostic emitted is just a warning and 2) acknowledging the declaration
even though it is ill-formed is consistent with the behavior of the following
test case:


namespace A
{
    extern "C" void foo (int);
}

namespace B
{
    extern "C" void foo ();
}

int
main ()
{
    B::foo ();
}

$ g++ -c exc.c
exc.C:9:29: warning: declaration of ‘void B::foo(int)’ with C language linkage
[enabled by default]
     extern "C" void foo (int);
                             ^
exc.C:3:21: warning: conflicts with previous declaration ‘void A::foo()’
[enabled by default]
     extern "C" void foo ();
                     ^

Here, a much more egregious bug may have been introduced yet the the second
ill-formed declaration is still usable.