Re: namespace namespace

[Sam Ruby <rubys at intertwingly dot net>]

Andrew Haley wrote:
> Sam Ruby wrote:
> > Andrew Haley wrote:
> > > Sam Ruby wrote:
> > > > Bryce McKinlay wrote:
> > > > > On Tue, Jun 23, 2009 at 10:39 AM, Chris Burdess<dog@bluezoo.org> wrote:
> > > > >
> > > > > > > Some genius (?) has a namespace called "namespace" :-)
> > > > > > That would be Sun. And in Java "namespace" is not a keyword so it's a
> > > > > > perfectly legal package name.
> > > > namespace also happens to be the name of a concept in XML...
> > > >
> > > > > > > I think you'll have to edit the header file by hand.
> > > > To what?  Specifically, what should namespace "namespace" be mapped to?
> > >    namespace$
> > >
> > > > It is beginning to appear to me that gcj/g++ will do name mangling of
> > > > Java packages without regard to C++ reserved words, resulting in entry
> > > > points that can't conveniently be referenced in C++ using CNI.
> > > That's right.  It should be fairly easy to fix this, though.
> > Just so that I'm clear: what you are saying is that *both* gcj/g++ and
> > gcjh need to be fixed.
>
> If you want to be able to access namespace namespace from CNI, yes.
>
> > I believe that doing such, while necessary, would break the binary
> > interface: in particular code which is compiled today to call into JAXP
> > would not work with new versions of JAXP that are compiled with a
> > version of gcj/g++ which has this fix.
> >
> > Is that OK?
>
> Yes.
>
> > > > Where can I find the "old" gcjh?  The current code is in Java, which
> > > > presumably does *not* have the mapping:
> > > >
> > > > http://cvs.savannah.gnu.org/viewvc/classpath/tools/gnu/classpath/tools/javah/?root=classpath
> > > But this is easily fixable, as I pointed out in my previous massage.
> > >
> > > The old gcjh is very out of date.  I'd just fix the current code.
> > Is that "I'd" or "I'll" :-)
>
> I'd.

OK, so you would.  The next question is who will?

> > Is there something more I can provide?  Will gcj/g++ also be fixed?
>
> Well, I already suggested how you might fix gcjh.  It's a matter of
> whether you want to be able to access namespace namespace from CNI or
> merely not have header files that choke C++.  Why not try the fix?

For the moment, I'm doing the equivalent of sed scripts to post process 
the header files (actually, I'm using Ruby -pi -e).

I can certainly fix gcjh locally, but I want to share my results with 
others, and ultimately the fix should go into cvs.  I'm certainly 
willing to do my share of the work, but you already identified the 
actual fix.  What's the next step?

> Do you really need CNI access to namespace namespace ?

What I am working on is the a Ruby extension that calls out to a HTML 5 
parser that happens to be written in Java and exposes a JAXP interface. 
 Along the way, I will have a need to create and access, via CNI, 
objects of the type javax::xml::namespace::QName.  I didn't create that 
class, nor can I change it.

http://intertwingly.net/blog/2009/06/23/Validator-Nu-on-GCJ-Update

> Andrew.

- Sam Ruby