[MacPorts] #51724: compilers-1.0: default to gcc6

[MacPorts]

#51724: compilers-1.0: default to gcc6
--------------------------+--------------------------------
 Reporter:  ryandesign@…  |      Owner:  macports-tickets@…
     Type:  enhancement   |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:
 Keywords:                |       Port:
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 The compilers 1.0 portgroup contains this line:

 {{{
 set compilers.gcc_default gcc5
 }}}

 Can this be changed to gcc6? gcc6 is the latest stable version of gcc at
 this time.

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Ticket URL: <https://trac.macports.org/ticket/51724>
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