[MacPorts] #17426: correctly set configure.compiler etc.

[MacPorts]

#17426: correctly set configure.compiler etc.
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 Reporter:  toby@…             |       Owner:  macports-tickets@…                   
     Type:  defect             |      Status:  new                                  
 Priority:  Normal             |   Milestone:  MacPorts base bugs                   
Component:  base               |     Version:  1.8.0                                
 Keywords:                     |        Port:                                       
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 Right now, configure.compiler and related variables are set during
 configure_main, which causes issues for ports with custom configure
 targets. Thus, stupid workarounds like r42685.

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Ticket URL: <http://trac.macports.org/ticket/17426>
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