arch lists with 'all' and machine architectures

[Craig Prescott <cpp@ekkaia.net>]

Hi;

I've been building the squeeze archive for alpha with my own wanna-build 
and buildd machines.  I'm a little new at this, but I've run across a 
few packages like this one, which fail like so:

> Automatic build of lazarus_0.9.28.2-8 on nevrast by sbuild/alpha 98
> Build started at 20100219-0250
> ******************************************************************************
> Checking available source versions...
> Fetching source files...
> Reading package lists...
> Building dependency tree...
> Reading state information...
> Need to get 16.4MB of source archives.
> Get:1 http://ftp.debian.org testing/main lazarus 0.9.28.2-8 (dsc) [1392B]
> Get:2 http://ftp.debian.org testing/main lazarus 0.9.28.2-8 (tar) [16.4MB]
> Get:3 http://ftp.debian.org testing/main lazarus 0.9.28.2-8 (diff) [17.2kB]
> Fetched 16.4MB in 7s (2068kB/s)
> Download complete and in download only mode
> : alpha not in arch list: all i386 powerpc sparc amd64 armel -- skipping
> ******************************************************************************
> Finished at 20100219-0250
> Build needed 00:32:31, 0k disk space

That is, 'alpha' is not in the arch list, even though 'all' is.

My buildd's @sbuild_args includes '--arch-all'.  Shouldn't this package 
have tried to build?

It's also not clear to me why a .dsc file would contain an Architecture 
list with 'all' as well as a list of machine architectures.  Is it a 
reasonable thing to do?  I didn't expect it.

Thanks,
Craig Prescott