[MacPorts] #20739: Allow ports to indicate supported architectures

[MacPorts]

#20739: Allow ports to indicate supported architectures
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 Reporter:  ryandesign@…             |       Owner:  macports-tickets@…                   
     Type:  enhancement              |      Status:  new                                  
 Priority:  Normal                   |   Milestone:  MacPorts Future                      
Component:  base                     |     Version:  1.7.1                                
 Keywords:                           |        Port:                                       
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Comment(by ryandesign@…):

 Replying to [comment:3 njbutko@…]:
 > As a MacPorts user (not developer), I think this is critical. It would
 have headed off the majority of these Snow Leopard issues before they even
 started.
 Unfortunately, nobody wrote any code to do this yet.
 > By default, I would like to see all dependencies built universally with
 the maximum amount of available architectures (including arm6/arm7 if
 applicable). This would allow for maximum flexibility -- if I want to
 install OpenCV, which links to Carbon and old Quicktime libraries and must
 be built in 32-bit mode, I still want the dependency libpng to be
 installed in the most flexible way. That way, later if I want to develop
 an iphone program that links to graphviz, which links to libpng, I'll be
 all set.
 >
 > It's really unfortunate that "port install foo" tries to only compile
 the default system architecture, and not something appropriate for foo.
 You can put "+universal" in your variants.conf if you want everything
 built universal. I suggested yesterday on the mailing list that we should
 do this by default on Snow Leopard. You can indicate what architectures
 you want in macports.conf. However, on Snow Leopard there's no point to
 specifying anything more than i386/x86_64, since Snow Leopard doesn't run
 on PowerPC.

 I would expect nothing but problems by attempting to build ports for arm6,
 arm7, or any architecture other than i386/x86_64/ppc/ppc64 in MacPorts, so
 I would recommend not trying that.

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Ticket URL: <http://trac.macports.org/ticket/20739#comment:5>
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