> On 11 Jun 2019, at 09:12, Lars Knoll <[email protected]> wrote:
> 
> That thread doesn’t explain why qtchooser isn’t a solution. It does work 
> without problems for all my use cases, and I certainly do have quite a few Qt 
> versions installed in parallel.
> 
> Part of the problem simply stems from the fact that Linux distributions want 
> to put all the binaries into /usr/bin. As long as you keep separate Qt 
> versions in separate directories there’s no problem I know of. Giving our 
> build tools different names depending on the version can create other 
> problems for our users, especially those that use some hand rolled build 
> systems (and we probably have lots of those as well).

I also use qtchooser and miss the days when Arch used to provide a package for 
it, and also the qtchooser config file along with Qt, so that it was easy to 
manage multiple Qt versions out of the box.  Switching between Qt4 and Qt5 was 
a breeze too.  Unfortunately they decided that it’s bad for regular users: 
https://bugs.archlinux.org/task/51308  I work around it by building qtchooser 
myself and installing to ~/bin (which I have early enough in my shell path to 
be able to override system binaries with a few of my own).  The same trick 
works on macOS too, BTW.  Brew doesn’t provide qtchooser either, you have to 
build it yourself.  I even use mostly the same config files on both Linux and 
macOS (~/.config/qtchooser/5dd.conf is always a debug build on dev branch for 
example, and in my shell I type “qt 5dd” to switch to that version), because ~ 
is the home directory even though it’s in a different place on macOS.  I have 
my config files in my dotfiles git repo and keep them synced between machines 
that way.  (You could use syncthing, also highly recommended.)

I do think qtchooser could be a generalized portable utility, not just for Qt.  
But switching versions by updating symlinks (as in the /etc/alternatives 
system) is relatively clumsy compared to the way qtchooser lets you switch to 
different versions in each shell instance if you like.

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