[MacPorts] #38232: Change default compiler variant from +gcc45 to +gcc47

[MacPorts]

#38232: Change default compiler variant from +gcc45 to +gcc47
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  Reporter:  larryv@…                            |      Owner:  larryv@…
      Type:  enhancement                         |     Status:  new
  Priority:  Normal                              |  Milestone:
 Component:  ports                               |    Version:
Resolution:                                      |   Keywords:
      Port:  adaptor apbs apbs-mpi ardour2       |
  arpack atlas bali-phy ccpnmr cdf dotwrp ds9    |
  emos eo fftw fftw-single fortrancl ftidy gpp4  |
  hdf5 jags lam lanHEP libctl libxc lua-numlua   |
  magicspp miriad molden ncarg netcdf-fortran    |
  octave octave-devel offlinefs omnixmp openmpi  |
  p5-extutils-f77 pdb2pqr pgplot pure-gen py-    |
  milk py-obspy py-scipy py-usadel1 py25-pymc    |
  py25-pynifti py26-logilab-hmm py26-ngl         |
  py26-nio py26-pymc py26-pymvpa py26-pynifti    |
  py27-pymc qrupdate R scotch shogun snoopy      |
  splash swig whatcheck whizard                  |
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Comment (by egall@…):

 > In the few ports that don’t provide variants, it changes the dependency
 from `port:gcc43` or `port:gcc45` to `port:gcc47`.

 Could these ports get changed to having compiler variants like the rest of
 the ports?

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Ticket URL: <https://trac.macports.org/ticket/38232#comment:2>
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