[Development] How to create a Qt5 offline installer myself

[Roland Winklmeier]

Dear Qt Devs,

I think I asked this question in the past, but I never got a reasonable
answer. The question is actually quite simple:

How can I create a Qt5 offline installer for example for 5.11.1 MinGW 5.3.0
32 bit?

I'm aware of the qt/qtsdk repository and its scripts. There is also some
high level description in the READMEs. But following the coin builds, those
are using GO scripts which are as far as I can see not public.So that
means, Qt build servers have been using those python scripts in the past,
but now they don't and that renders them in fact untested and unmaintained.
I don't mind doing more steps manual (even if automating it fully would be
super great), but I cannot even find a easy way of doing it manually.

It was often mentioned in this mailing list, that users/developers can
build their own version of Qt and the official binaries are just a subset.
That's fair enough and I can and do regularly build Qt on my own. But my
own build doesn't help me much, if I cannot bundle it into a proper
installer and make it available to other people and/or build servers.To me,
this is still a very important step which should be properly documented and
as easy reproducable as the regular Qt5 build.

So if anyone has a good and easy to follow guide, how to produce my own
offline installer, please share it with me. Ideally we come up with a wiki
page similar to https://wiki.qt.io/Building_Qt_5_from_Git.
The reason why I'm asking is, that I would like to try and get some changes
into the binaries (release build with debug symbols for crash dumps, MSVC
2017 32 and 64 bit builds etc).

Looking forward to any help.

Thanks,
Roland
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