[Development] Qt 6 co-installability with Qt 5
Shawn.Rutledge at qt.io
Mon Nov 9 19:47:52 CET 2020
> On 9 Nov 2020, at 19:27, Shawn Rutledge <Shawn.Rutledge at qt.io> wrote:
>> On 2 Nov 2020, at 17:15, Thiago Macieira <thiago.macieira at intel.com> wrote:
>> ]qml is like Python: because of plugins, it's tied to the Qt version.
>> Therefore, it fails the requirement for supporting everything the old version
> Well if you were using modules that are no longer supported, or you run into some little incompatibility; but we have been trying to avoid API breaks. QML files that begin with “import QtQuick 2.0” still work fine so far; also Controls, Layouts etc. So IMO it’s less onerous than the python upgrade.
… but your point was not about QML file compatibility but about the mere fact that we have a BC break, so users need two versions of the qml interpreter installed at the same time, right? And I still rather like the idea of just installing them in different places, and having a symlink to point to the one you want to use. If distro maintainers insist that /usr/bin/qml must be an executable and not a symlink, then I guess it should be the Qt 6 version, to go along with the fact that we’re pushing the open source community pretty hard to upgrade as soon as it’s released. The Qt 5 version of qml can be hidden in another directory, because users who are developing new software presumably don’t need it too often anymore. As for shebang scripts… I will admit that they are probably scarce, because we haven’t publicized this feature much. And even if some people wrote them, many of those should still work.
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