platform range and set arguments?

[Jordan K. Hubbard]

Hey all,

I was just looking at the ghc port a few days ago, mostly in an  
attempt to figure out why it a-splode! on my 10.5 PPC system, and I  
noticed a lot of this:

platform darwin 7 powerpc { ... }
platform darwin 8 powerpc { ... }
platform darwin 8 i386 { ... }

And so on.  It occurred to me that if "platform darwin 9  
powerpc" (that's me) was going to duplicate a lot of the existing  
rules, maybe it would make more sense to introduce ranges and sets to  
the existing logic (I checked, and there's currently no support for it  
that a cursory glance indicated, anyway).

Then we could do stuff like this:

platform darwin [7-8] powerpc { ... }

platform darwin 9 {powerpc, i386} { .. }

And have far more concise portfiles.   We might also have a  
platform_isset procedure so that you could do:

platform darwin [7-9] {
	if {[platform_isset darwin 8]} { .. do some special tiger-only  
magic .. }
	... more darwin generic foo here ...
}

Thoughts?  If folks like the idea and nobody immediately jumps to do  
it, I might give the appropriate hacks a whack (eee!  managers coding!).

- Jordan


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