[MacPorts] #19666: Dependency on external compiler

[MacPorts]

#19666: Dependency on external compiler
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 Reporter:  and.damore@…             |       Owner:  krischik
     Type:  enhancement              |      Status:  new     
 Priority:  Normal                   |   Milestone:          
Component:  ports                    |     Version:  1.7.1   
 Keywords:                           |        Port:  gnat-gcc
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 I had the same issue of #18415 .

 I suggest to :
  * explicitly add a note into description warning the user about the need
 to have a bootstrap compiler
  * add dependencies into the Portfile to avoid building the port at all if
 no compiler is found rather than let it break while trying to.

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Ticket URL: <http://trac.macports.org/ticket/19666>
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