[MacPorts] #44193: qt: allow side by side installation of qt4-mac and qt5-mac

[MacPorts]

#44193: qt: allow side by side installation of qt4-mac and qt5-mac
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  Reporter:  mojca@…           |      Owner:  mcalhoun@…
      Type:  enhancement       |     Status:  new
  Priority:  Normal            |  Milestone:
 Component:  ports             |    Version:
Resolution:                    |   Keywords:
      Port:  qt4-mac, qt5-mac  |
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Comment (by mojca@…):

 Just a bit of teasing: After years of no activity on the Qt5 front and a
 year and a half of having conflicting Qt4/5 ports (basically: useless Qt5
 port as long as one needed Qt4 somewhere) it is nice to see that a small
 and "stupid" incompatibility in 10.11 can finally start make the things
 moving ... ;)

 Truth to be told, it would be extremely helpful if we had more time to
 prepare for this event, but from what I understand all Qt dependents (both
 Qt4 and Qt5) are currently broken on 10.11, so fixing anything is of a
 relatively high priority. We probably cannot afford to spend months
 testing all the Qt dependents, so the scenario will probably be as
 follows(?):
 - warn all users (and developers) to avoid upgrades for the next X days if
 they are not willing to cope with consequences
 - do the radical changes in `qt4-mac` and `qt5-mac` (maybe we could even
 call those ports `qt4` and `qt5` and leave the old ports there during the
 transition period; then remove them)
 - ask everyone to fix as many dependent ports as quick as possible
 Or do you have better ideas about how to go on with all the shifting of
 Qt4 files?

 It takes days (certainly more than 24 hours) on my old mac to compile
 anything Qt-related, so testing multiple different installation options is
 an extremely painful process for me. But given how much effort René
 already put into trying to get things fixed also for KDE, it would be
 extremely helpful to take a careful look into his patches. If keeping some
 kind of consistent structure is important for KDE, I would be in favour of
 trying to obey at least some general guidelines and similarities with
 GNU/Linux to simplify compatibility. Having to have another copy of
 qt4-kde just for the sake of "more consistent" directories would be highly
 suboptimal and lots of extra work for everyone involved in Qt-related
 activities. And lots of extra disk space and precious processor time
 required.

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Ticket URL: <https://trac.macports.org/ticket/44193#comment:59>
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