Qt5 port group

[Ryan Schmidt]

On May 9, 2018, at 07:18, Craig Treleaven wrote:

> On May 8, 2018, at 5:06 AM, Vincent Habchi wrote:
> 
>> I was in the process of modifying the Qt5 Port group to allow for choosing the Qt version one wants to link an application against using variants. However, before I go further, I’d like to know if concurrent installations of different Qt5 versions are supported in MacPorts. If not, what I do is just futile.
> 
> Um, there are subports for each Qt5 version.  Picking one at random:
> 
> $ port info qt57-qtwebkit
> qt57-qtwebkit @5.7.1_1 (aqua)
> Variants:             debug, examples, tests, universal
> 
> Description:          Tools and Module(s) for Qt Tool Kit 5: Qt WebKit and Qt WebKit Widgets
> Homepage:             http://qt.io
> 
> Extract Dependencies: xz
> Build Dependencies:   python27, pkgconfig
> Library Dependencies: fontconfig, icu, leveldb, webp, libxml2, libxslt, zlib, sqlite3, qt57-qtdeclarative, qt57-qtlocation, qt57-qtmultimedia, qt57-qtsensors, qt57-qtwebchannel, qt57-qtxmlpatterns, qt57-qtbase
> Conflicts with:       qt3, qt3-mac, qt56-qtbase, qt58-qtbase, qt5-qtbase, qt55-qtbase, qt59-qtbase
> Platforms:            macosx
> License:              {LGPL-3 GPL-3 OpenSSLException}
> Maintainers:          Email: mcalhoun at macports.org, GitHub: MarcusCalhoun-Lopez
>                      Policy: openmaintainer
> 
> Notice that the port depends on several Qt5 ports which are all specified at the same level (“57”).  It conflicts with other versions of Qt.
> 
> Is that not sufficient?

My understanding of the fact that they conflict is that there is some latest version of Qt that is compatible with each version of macOS, and that by using the qt5 portgroup, one automatically receives that version. However, in practice, that does not appear to be the case. I see build failures of my Qt-using ports on some macOS versions because the chosen version of Qt is not compatible with that version of macOS.