[MacPorts] #33890: base: add default compiler variants

[MacPorts]

#33890: base: add default compiler variants
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 Reporter:  sean.michael.farley@…          |       Owner:  macports-tickets@…                   
     Type:  enhancement                    |      Status:  new                                  
 Priority:  Normal                         |   Milestone:                                       
Component:  base                           |     Version:  2.0.4                                
 Keywords:                                 |        Port:                                       
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Comment(by mmoll@…):

 This seems like a really good idea to me. There so many ports with
 essentially the same code for specifying compilers (usually when a Fortran
 compiler is needed). There are simple copy-paste errors or missing
 "conflicts" between options that can be avoided if there is one central
 place for this.

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Ticket URL: <https://trac.macports.org/ticket/33890#comment:6>
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