[MacPorts] #52922: qt5 @5.6.2_0: build errors on 10.7

[MacPorts]

#52922: qt5 @5.6.2_0: build errors on 10.7
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  Reporter:  mojca                               |      Owner:
                                                 |  MarcusCalhoun-Lopez
      Type:  defect                              |     Status:  new
  Priority:  Low                                 |  Milestone:
 Component:  ports                               |    Version:
Resolution:                                      |   Keywords:  lion
      Port:  qt5 qt5-qtdoc ​qt5-qtmultimedia     |
  qt5-qtserialbus qt5-qtwebengine qt5            |
  -qtwebengine-docs qt5-qtwebkit qt5-qtwebkit-   |
  docs qt5-qtwebview qt5-qtwebview-docs          |
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Comment (by RJVB):

 QtSerialBus and QtWebKit both require C++11; QtWebEngine might be in the
 same boat but apparently no one verified that for other reasons (see
 below).
 Suppose these two ports indeed build with the cxx11 PortGroup, on libc++
 enabled platforms. Wouldn't that mean that all their Qt dependencies also
 need to be built that way?

 I think QtWebEngine is a lost cause, and that probably doesn't even depend
 on Qt but on Chromium (QtWebEngine is essentially Google Chrome without
 all the Google bits and with a thin Qt coat over it). It's in very rapid
 development; 5.7.0 already failed to build on OS X 10.9 which will
 supposedly be fixed in 5.7.1 but I kind of foresee that 5.8 may require at
 least 10.10 .

 I'm beginning to think that QtWebEngine should be getting its own port. It
 certainly is large enough not to have anything of a "sub" port. Splitting
 it off would also be very useful in light of the foreseen introduction of
 port:qt5-kde but above all it will make it easier to turn it into a multi-
 versioned port that provides the latest supported version on each of the
 supported OS versions.

 I think it may be a bit easier to split off the qtwebengine subport from
 my qt5-kde port (qtwebengine has nothing KDE-specific) so if Marcus agrees
 I can make up a draft which could include a 5.5.1 set-up for OS X 10.7 .
 The question is how many *dependents* will work with QWE 5.5x and for how
 long, but we'll just have to see that. There should always be the choice
 to keep those on a version that still uses QtWebKit.

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Ticket URL: <https://trac.macports.org/ticket/52922#comment:1>
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