[proposal/testsuite] require build == host

[Andrew Cagney]

> ac> What do the dejagnu maintainers have to say about the feature?
> 
> I haven't asked, but it's a supported feature of dejagnu and I'm
> willing to accept that they will keep on supporting it.

It would be useful, just so that we know where they are going.

> Dan Kegel is at least one user of dejagnu who uses build != host
> with gcc.  He wrote a whole section in his cross-gcc faq about it.
> People are testing gcc with dejagnu using build != host,
> so it would be good if gdb testing worked in the same environment.
> 
> ac> As for a system that would/should use this - djgpp.
> 
> You got me there.  It's been a while since I used windows,
> but I suspect that windows has telnet/ftp servers.
> 
> Eli, is it possible to ftp into a windows box and upload and
> download files?  More important, is it possible to telnet into
> a windows box and run a command-line interpreter?

This is how the original cygwin testing was done - at a dos prompt.

> It looks like I should go with Plan B: file PR's against the
> test scripts that don't work on build != host, and eventually
> fix them.

For the moment, lets stick with the status quo.  Tests are required to 
work host==build.  Having a test work host!=build is an added bonus, but 
not a requrement.  We can hardly enforce host!=build when there's no way 
to test it and the return on investment is marginal.

Andrew