Solved Build Qt 5.15 (32-bit) from sources

[aleksandr_kv]

Hello, everyone.

The page with Qt Online Installer (32-bit) throws an error 404 :(
I tried to build it from sources, but faced with problem of multiple undefined reference, although I did everything according to the instructions.
Has anyone built it from source? What algorithm did you use?

[SGaist]

Hi and welcome to devnet,

That guide is from 3 years ago. There have been changes in between to what dependencies shall be provided by your OS.

So what exact error are you getting ?
Are you building from git or from a source tar ball.

[Vsevolod Fedorov]

@SGaist Hello, I'm a colleague of Aleksandr. So, the first issue is about an invalid link to the 32-bit Installer. If a proper copy of this software is currently exist, it would be great if we can get a valid link, and this may solve all of our questions. Otherwise:
OS: Mint 19.3 32 bit (VM)
Options to ./configure:

/opt/qt5_configure/configure -nomake examples -nomake tests -opensource --confirm-license -skip qtwayland -skip qtlocation -skip qtscript -xcb -xcb-xlib -skip qtdoc -prefix /opt/Qt5 

The library seems to successfully built. but efforts to run a Qt app with QML and GUI ends with error of not found xcb qt plugin. By installing dependencies as shown in this manual , current problem has been solved.
Unfortunately, the second try of running Qt GUI application end with this message:

Failed to create OpenGL context for format QSurfaceFormat(version 2.0, options QFlags<QSurfaceFormat::FormatOption>(), depthBufferSize 24, redBufferSize -1, greenBufferSize -1, blueBufferSize -1, alphaBufferSize -1, stencilBufferSize 8, samples -1, swapBehavior QSurfaceFormat::DoubleBuffer, swapInterval 1, colorSpace QSurfaceFormat::DefaultColorSpace, profile  QSurfaceFormat::NoProfile)

I looked up and found the only reason - there is a problem with running a 32 bit virtual machine on a 64 bit host.
So could it be the reason of an app crash, or are we missing something?

Thanks!

[Bonnie]

Here is the download page of online installer:
http://download.qt.io/official_releases/online_installers/
You can also choose a mirror by clicking the "Details" on the right.

[Vsevolod Fedorov]

@Bonnie Thank you for providing a link but there is not 32 bit version for Linux.

[Bonnie]

@Vsevolod-Fedorov
Ah, right, they've already stopped providing precompiled 32bit binaries for Linux since 5.6...
Even if there is a 32bit installer, I think there won't be 32bit 5.15 in it...

[SGaist]

@Bonnie said in Build Qt 5.15 (32-bit) from sources:

@Vsevolod-Fedorov
Ah, right, they've already stopped providing precompiled 32bit binaries for Linux since 5.6...
Even if there is a 32bit installer, I think there won't be 32bit 5.15 in it...

Indeed, the 32 bit prebuilt binaries have been stopped a long time ago because of the low number of downloads.

As for the 32bit build, do you need Qt 5.15.0 ?
If not, why not use the version provided by your distribution ?

[Vsevolod Fedorov]

@SGaist Yes, I do. Newly introduced features (especially, in Qt QML) are very useful for my educational project connected with front-end development . Nevertheless, I guess the topic can be closed because the main issue was about a valid online 32-bit installer, which is not persist for 32-bit anymore.