[Module::Build] Extending M::B::Platform::* and issues with "provides"

[Chris D. <ch...@cl...>]

I'm working on a subclass of Module::Build that is intended to package 
non-Perl material.  I've found M::B to be modular enough that this is 
feasible without hacking *too* deeply (bravo to Ken and others!).  One 
aspect of this project includes adding platform-dependent compilation 
routines.  I accomplished this by simply saying something like:

-------- lib/Module/Build/Foo.pm -----------
package Module::Build::Foo;
our @ISA=qw(Module::Build);
...
sub ACTION_foo {
   my $self = shift;
   $self->compile_foo($_) for (@{ $self->find_foo_files })
}
...
package Module::Build::Base;
sub compile_foo {
   print "Compiling foo is not supported on this platform\n';
}
package Module::Build::Platform::darwin;
sub compile_foo {
   my ($self, $file) = @_;
   $self->do_system("compileFoo", $file);
}
1;
---------------------------------------------

This seems to work great with one exception:  META.yml now contains the 
following lines

---------------------------------------
provides:
   Module::Build::Base:
     file: lib/Module/Build/Foo.pm
     version: 0.10
   Module::Build::Foo:
     file: lib/Module/Build/Foo.pm
     version: 0.10
   Module::Build::Platform::darwin:
     file: lib/Module/Build/Foo.pm
     version: 0.10
---------------------------------------

I think this is bad thing, yes?  I'm not providing those packages; I'm 
just hacking them for my particular environment.  Questions:

1) Is there a better way to add platform-specific extensions to M::B 
subclasses without hacking ::Base and ::Platform::*?

2) Would explicitly declaring
    sub Module::Build::Base::compile_foo { ... }
be better?

3) Is there a good way to tell ACTION_distmeta not to include those 
hacked packages in the provides hash?

Thanks,
Chris

P.S. In M::B v0.20, ACTION_distmeta has an out-of-date warning message 
about Module::Info.  I happened to notice that in my research for the 
above questions.  I didn't check CVS to see if it's already been fixed.

--
Chris Dolan, Software Developer, Clotho Advanced Media Inc.
ch...@cl..., 294-7900, 211 S Paterson, Madison WI 53703