Problems compiling Qt 5.8 on Debian 8.7.1

SGaist · wrote on 21 Mar 2017, 08:14

@JiujiuTong wait a minute, there's a problem here, you are mixing a cross-compilation problem which is not related to the problem at hand for @Harry123 which is just trying to compile Qt for its desktop.

@Harry123 Can you share the configure line you used to compile Qt on your machine ?

Harry123 · wrote on 21 Mar 2017, 10:12

@SGaist :
I first tried ./configure -debug which gave me the problem of QGLContext.
I next tried ./configure -debug -no-opengl which gave me the problem of QQuickFramebufferObject.

SGaist · wrote on 21 Mar 2017, 11:32

Can you check with -opengl desktop ?

I'd recommend doing out of source builds. That way you can just nuke the build folder is something goes wrong.

Harry123 · wrote on 21 Mar 2017, 13:11

@SGaist :

It wouldn't work with -opengl desktop because already when I used just ./configure I had a message about opengl missing.

I have anyway given up on compiling the sources - configure simply doesn't do the job correctly with the default flags, and each try takes hours.

I have taken to using instead the online installer, which installs a viable version optionally with the sources.

Would you know if I can use the online installer to install directly into the /usr folders such as /usr/bin, /usr/include etc. ? Or after the installation to copy the installed folders to there?

SGaist · wrote on 21 Mar 2017, 13:27

In that case it means you don't have the OpenGL dev package installed.

You can't and you shouldn't even try. You'll be clearly messing with your distribution installation which is a very bad idea.

If you want to share your Qt installation with several users on your machine then use the default which is /opt otherwise, you can also simply install it in your home folder.

Harry123 · wrote on 21 Mar 2017, 13:43

@SGaist :
I'm the only user and the installation is on a VM.
I would like to reproduce the effect of Qt being installed from the repository, even though version 5.8 is not in it.

SGaist · wrote on 21 Mar 2017, 14:10

That's not a good idea. You are trying to replace your system Qt installation which has been built by the Debian folks in a state known to work for them.

Why do you want to replace it ?

If you want the Debian variant of Qt 5.8 then install the experimental version of Debian.

Harry123 · wrote on 21 Mar 2017, 15:34

@SGaist :
OK, I gave up on this idea. Unfortunate that a repository does not exist for QT 5.8 (Debian experimental only contains parts).
I will stay with the online installation and will give up on my ambition to compile Qt.
Too bad, as I wanted a real debug version for easier debugging.

SGaist · wrote on 21 Mar 2017, 20:18

Like I already wrote, there seems to be something missing on your system.

You should be able to build Qt 5.8 without any problem on Debian.

Harry123 · wrote on 22 Mar 2017, 20:24

@SGaist : Unfortunately we live in an imperfect world.
Thanks for your help - much appreciated.

I will mark this post as solved, even though it's not really, but I have no more time to spend on this.