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

[MacPorts]

#38232: Change default compiler variant from +gcc45 to +gcc47
-------------------------+-------------------------------------------------
 Reporter:  larryv@…     |      Owner:  larryv@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 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
-------------------------+-------------------------------------------------
 If #33544 was the sequel to #20103, then this makes it a trilogy. Prequels
 are in the works.

 This patch adds `+gcc46` and `+gcc47` variants to those ports that don’t
 already have them and changes the default to `+gcc47` in those ports that
 set a default. In the few ports that don’t provide variants, it changes
 the dependency from `port:gcc43` or `port:gcc45` to `port:gcc47`.

 - If this isn’t appropriate for your port(s), say something.
 - If GCC 4.7 causes problems for your port(s), say something.
 - If I made a typo somewhere or didn’t switch your port(s) over to
 `[+]gcc47` properly, say something.
 - If I accidentally added `+gcc46` to a port that needs GCJ, say something
 because `gcc46` currently doesn’t include GCJ. I tried to keep an eye out
 for this, but `swig-gcj` was the only one I noticed.
 - If you just want to say hello, say something. Or not.

-- 
Ticket URL: <https://trac.macports.org/ticket/38232>
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