[MacPorts] #27788: ports should ignore default +universal when universal archs mismatch

[MacPorts]

#27788: ports should ignore default +universal when universal archs mismatch
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 Reporter:  allbery.b@…          |       Owner:  macports-tickets@…                   
     Type:  enhancement          |      Status:  new                                  
 Priority:  Low                  |   Milestone:                                       
Component:  base                 |     Version:  1.9.2                                
 Keywords:  arch                 |        Port:                                       
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 A number of open ports bugs involve `+universal` doing the wrong thing.
 In many cases, the problem is that `configure.universal_archs` isn't
 consistent with `universal_archs` in `macports.conf`; this is especially
 troublesome when `+universal` is specified in `variants.conf`.

 It occurs to me that, similar to `variants.conf` variants being silently
 ignored if a port doesn't support them, `+universal` in `variants.conf`
 should be silently ignored when `configure.universal_archs` doesn't match
 `universal_archs`.  The current behavior is correct if `+universal` is
 explicitly specified, however.

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Ticket URL: <https://trac.macports.org/ticket/27788>
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