[MacPorts] #20728: When building +universal, warn if dependencies don't have +universal

[MacPorts]

#20728: When building +universal, warn if dependencies don't have +universal
-------------------------------------+--------------------------------------
 Reporter:  ryandesign@…             |       Owner:  macports-tickets@…                   
     Type:  enhancement              |      Status:  new                                  
 Priority:  Normal                   |   Milestone:                                       
Component:  base                     |     Version:  1.7.1                                
 Keywords:                           |        Port:                                       
-------------------------------------+--------------------------------------
 When building a port with the universal variant, MacPorts base should
 print a warning if any of that port's library or runtime dependencies have
 a universal variant but the dependency is not installed with that variant.

 Most ports would fail to build in this case if their dependencies aren't
 universal. But in [ticket:20727 some situations] the build might silently
 succeed, but not be usable. Either way, a concrete error message from
 MacPorts about the issue would be good, e.g.

 {{{
 Warning: Before building fontconfig with the universal variant, you should
 build libiconv with the universal variant
 }}}

-- 
Ticket URL: <http://trac.macports.org/ticket/20728>
MacPorts <http://www.macports.org/>
Ports system for Mac OS