#44193: qt: allow side by side installation of qt4-mac and qt5-mac -------------------------------+------------------------ Reporter: mojca@… | Owner: mcalhoun@… Type: enhancement | Status: new Priority: Normal | Milestone: Component: ports | Version: Resolution: | Keywords: Port: qt4-mac, qt5-mac | -------------------------------+------------------------ Comment (by rjvbertin@…): Another word about the exceptions "issue": I am using a Qt4 build with these same patches to minimise support for exceptions *inside* Qt on several Linux/KDE4 (Kubuntu 14.04) desktops. I haven't run into a ''single'' issue related to building Qt that way. Replying to [comment:74 michaelld@…]:

0) commit the minimal patch to allow qt4-mac to install into libexec (just change qt_dir to be "${prefix}/libexec/qt4");[[BR]] It's not perfect, but it gets things moving & does not require more testing/evaluation.

The patch is minimal, but you're NOT minimising the amount of work it generates.

We will have enough work getting Qt4 dependent ports working with the parallel build that I don't think we need more things to deal with just right now.[[BR]]

One last time, there will be less work, potentially much less work, by keeping the current install layout like it is as much as possible, and moving only the few parts that are not compatible with a parallel install (*not* "parallel build", that's something else). And if I'm right, all that unnecessary work will have to be undone at some point. As to shared maintainership on a qt4-mac-devel port: I don't think I like that idea any better than you seem to like the idea of it for port:qt4-mac . With only one of us having commit rights it'll be difficult enough already to maintain the shared part of the `qt4` Portgroup. Or has there been a change in "base" that allows content `_resources` directories (including the port/group directory) in a "personal" port tree to override the content from the global _resources directory? As long as that's not the case, users of portgroups from my repository have to copy the corresponding files into the global _resources directory.

and whatever changes are required to qt4-mac to allow it and qt4-mac- devel to be hot-swappable replacements;

Hot-swapping after we've basically ended up in the situation of qt5-mac and my proposed qt5-kde, with the former installing all of Qt into a single prefix and the latter moving only the minimal number of components w.r.t. the current layout? * That will only be possible if my port provides symlinks in ${prefix}/libexec/qt4 that point to the locations where stuff is actually installed. That's not impossible (I presume), but not exactly any better than the transitional variant I'm providing at the moment.

these will probably require a rev-bump to qt4-mac

As long as those changes do not touch the qt4-mac Portfile but only the PortGroup, a rev-bump shouldn't be required. Not as long as one accepts that users of qt4-mac-devel will have to build every dependent port from source (because the binary builds will all be for qt4-mac users). -- Ticket URL: <https://trac.macports.org/ticket/44193#comment:75> MacPorts <https://www.macports.org/> Ports system for OS X