Qt5 port group

[Marcus Calhoun-Lopez]

I believe this is possible.
However, as Ken pointed out in a previous email, we have two models we could follow:

1) The gtk3 +quarts vs gtk3 +x11 model
    (Almost) every dependent port of gtk3 has quartz and x11 variants consistent with whatever gtk3 was installed with.
    I *think* this could be done in the qt5 PortGroup.
    Every port which uses PortGroup qt5 would get a qt5LTS variant (or a better name).
    We already have some the machinery for the long delayed qt5kde variant.

2) The multiple LLVM/GCC versions model
    Most of Qt 5 is installed into ${prefix}/libexec/qt5.
    The exceptions are the cmake and pkgconfig files.
    We could try to allow multiple simultaneous installations of Qt.
    Each port would then be free to choose whichever is better.

I am not sure which (if either) would be a good design choice.

-Marcus

> On May 11, 2018, at 3:55 AM, Craig Treleaven <ctreleaven at macports.org> wrote:
> 
> Would there be some way to designate that a port wishes to rely only on LTS versions?  AIUI, Qt 5.6 and 5.9 are currently the long term support versions.  Qt 5.6 is supported on macOS 10.8, 10.9, 10.10, 10.11.  (“Deployment only on 10.7”, they say.)  Qt 5.9 is supported on macOS 10.10, 10.11, 10.12.  Presumably it also works on 10.13.  Qt 5.5 is defacto supported on earlier platforms.
> 
> qt5.get_default_name would effectively become:
> 
> os.major  9 through 11, qt55
> os.major 12 through 14, qt56
> os.major after13, qt59
> 
> When the Qt project releases a new LTS version, I would recommend that we NOT recognize it as LTS for our purposes until at least the first major bug fix release.
> 
> I hope I haven’t missed something blindingly obvious.
> 
> Craig
>