Adding a MACHINE_ARCH note

[Baptiste Daroussin]

On Wed, Jul 10, 2013 at 04:11:37PM -0400, John Baldwin wrote:
> On Wednesday, July 10, 2013 3:55:47 pm Baptiste Daroussin wrote:
> > On Wed, Jul 10, 2013 at 12:26:42PM -0700, Adrian Chadd wrote:
> > > On 10 July 2013 09:55, Warner Losh <imp at bsdimp.com> wrote:
> > > 
> > > >> That's the reason I replied about it. Not specifically to make it
> > > >> happen _everywhere_, but to see if we're about to migrate to a tool
> > > >> that doesn't support it, making it a much bigger deal to migrate again
> > > >> later.
> > > >
> > > > I've been talking to Baptiste, and it will support this.
> > > 
> > > Sweet.
> > > 
> > > Thanks!
> > > 
> > > 
> > > -adrian
> > 
> > Yeah I need to get a simple and uniq way to gather the different ABI, I have
> > been creating my own ABI string to solve this, but I'm far from being a
> > specialist.
> > 
> > While thinking about this kind of thing, please please think about a format that
> > can easily give us a way to figure out a way to get cross ABI binaries support.
> > 
> > pkgng needs for example to allow i386 packages to be installed on amd64 because
> > amd64 does support it.
> > 
> > Maintaining a list the compatibility will be painful.
> > 
> > In my own version I have
> > os:version:family:class:...
> > 
> > for example here:
> > on FreeBSD 9 i386 we have:
> > 
> > freebsd:9:x86:32
> > 
> > on FreeBSD 10 amd64 we have:
> > 
> > freebsd:9:x86:64
> > 
> > now if I do want a package I can install on both amd64 and i386 I just have to
> > create a package saying:
> > 
> > freebsd:9:x86
> > 
> > or if I want a package that can be installed on all arches:
> > 
> > freebsd:9
> > 
> > It became complicated for arm and mips because of the multiple variation
> > available.
> 
> You should look at how MACHINE_CPUARCH vs MACHINE vs MACHINE_ARCH works.
> 
> Keep in mind that amd64/i386/pc98 should probably have MACHINE_CPUARCH of x86,
> but we just haven't done that yet.  If we did that I think you could follow
> src's conventions and be fine.  Something like:
> 
> os:version:cpuarch:arch
> 
> Where cpuarch == MACHINE_CPUARCH (should be x86 on amd64/i386/pc98, but isn't
> yet.  It ss sane on other platforms) and
> arch == MACHINE_ARCH (amd64/i386 (for pc98 MACHINE_ARCH is i386))
> 
> So that would give:
> 
> freebsd:9:x86:amd64
> freebsd:9:x86:i386 (for both pc98 and i386)
> freebsd:9:arm:armv6
> 
> etc.
> 
> I think that means we could eventually support x32 as:
> 
> freebsd:9:x86:x32
> 
> We might have an x32 world (but perhaps not a kernel?, though we would need
> the headers to DTRT)

I do like the idea a lot.

regards,
Bapt
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