[MacPorts] #48857: gcc ports: support compiling multiple archs (universal)

[MacPorts]

#48857: gcc ports: support compiling multiple archs (universal)
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  Reporter:  devernay                            |      Owner:  macports-
                                                 |  tickets@…
      Type:  enhancement                         |     Status:  assigned
  Priority:  Normal                              |  Milestone:
 Component:  ports                               |    Version:
Resolution:                                      |   Keywords:
      Port:  gcc43 gcc44 gcc45 gcc46 gcc47       |
  gcc48 gcc49 gcc5 gcc6                          |
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Comment (by kencu):

 gcc6 and newer support the `-arch` flag natively now (by incorporating the
 above driver directly).

 It would be helpful to see gcc6 and libgcc, and perhaps newer gcc
 versions, support building cross-platform universal again.

 I wonder if this might be as simple as reinstating code that was used in
 apple-gcc-4.2, that was subsequently disabled in gcc 4.4 to gcc 5 (which
 did not support the `-arch` flag).

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Ticket URL: <https://trac.macports.org/ticket/48857#comment:8>
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