Re: [Openexr-devel] Compiling with gcc4.0.1 - compilation error andfix

[Florian Kainz]

Bob Friesenhahn wrote:
> On Tue, 19 Jul 2005, Kevin Wheatley wrote:
>
> > Florian Kainz wrote:
> >
> > > Thank you for pointing this out.  I think this is a bug in
> > > gcc 4.0.1; you should probably report it to the gcc maintainers.
> >
> >
> > I don't think it is a bug, at least according to the C++ standard. If
> > no Image is in scope at the point of the friend declaration, it is
> > going to inject the Image class into the ImageChannel scope. This is
> > different to the pre-standard ARM, where it would have injected it
> > into the innermost non class scope (from memory my ARM is at home :-)
>
>
> I must agree that GCC 4.0.1 is doing the right thing here and the code 
> has a bug.
>
> The error/warning capabilities of GCC 4.X are a clear improvement over 
> its predecessors.

The proposed fix for exrmaketiled is harmless one way or the
other, and changing the code won't create a problem.  However,
I still maintain that there is a bug in gcc 4.0.1 that should
be reported.

Section 11.4, clause 2 (page 180) of ISO/IEC 14882 contains
two code examples.  Here's one of them:

    class X {
        enum { a = 100; }
        friend class Y;
    };

    class Y {
        int v[X::a];            // OK, Y is a friend of X
    };

    ...

Note that there is no forward declaration of Y before X.
Does gcc 4.0.1 give an error message for the example above?

Florian