Building/installing Qt-6.5.2 from source on ubuntu-22.04

[prathyuch.1999]

@Christian-Ehrlicher
Yes, now there is now warning of QtWebEngine at configure step.

But after successfully configured now i am getting following error related to gn, while doing next step (cmake --build . --parallel) screenshot of error is below :

Error Screenshot-2

Error Screenshot-3

Please suggest me what is the problem ?
How to remove this gn error ?

[Christian Ehrlicher]

As you can see it's failing when looking for cups-config.

[prathyuch.1999]

@Christian-Ehrlicher
Thanks for your advice, i did same and now there is no warning of QtWebEngine at configure step.
But it was getting failed in next step with below error :
"c++: fatal error: Killed signal terminated program cc1plus"
I checked with dmesg, and found some out of memory things.
Even though i have 16GB of RAM, then I increased my swap size from 2 GB to 8GB.
Again did cmake....
But now, after some time terminal is getting crashed without any warning or error.

I checked with top command and found that some time cpu utilization is getting 85% to 100% by cc1plus and kswapd0.

How to overcome this error ?

dmesg output:

[JonB]

@prathyuch-1999
I think you have to reduce the number of parallel builds/processes going on. There was a recent (last month?) thread to this effect, you might try to find it while awaiting a definitive answer.

[prathyuch.1999]

@JonB said in Building/installing Qt-6.5.2 from source on ubuntu-22.04:

There was a recent (last month?) thread to this effect,

Please share the link of above thread.

[JonB]

@prathyuch-1999 If I could I would. Perhaps you'd like to search instead of me.

[jsulm]

@prathyuch-1999 Simply add -j NUMBER_OF_BUILD_PROCESSES to your cmake --build call...

[prathyuch.1999]

@jsulm
I already did this also, i have 12 core processor so i added -j12 in cmake, but no solution. Same problem exists, terminal getting crashed.

[sierdzio]

@prathyuch-1999 said in Building/installing Qt-6.5.2 from source on ubuntu-22.04:

@jsulm
I already did this also, i have 12 core processor so i added -j12 in cmake, but no solution. Same problem exists, terminal getting crashed.

That is not reducing the number of threads ;-) Use -j1 or -j2, this will reduce RAM usage considerably.

[prathyuch.1999]

@sierdzio
It didn't worked, same problem.... system is getting stucked.

[JoeCFD]

@prathyuch-1999 are you building Qt under root? If yes, do not do it. You should build it under your user name and install it somewhere under root.

[prathyuch.1999]

@JoeCFD
Thanks for your advice, i tried to build as a user this time system is not stucked but doing cmake, build is getting failed at same position.

2nd screenshot

dmesg output

[sierdzio]

Looks like you need more RAM.

[prathyuch.1999]

@sierdzio
Hi,
I have RAM-16GB, 12 core processor and created swap of size 8GB ?
16GB RAM is not sufficient ? or what could be the problem ?

[sierdzio]

@prathyuch-1999 said in Building/installing Qt-6.5.2 from source on ubuntu-22.04:

@sierdzio
Hi,
I have RAM-16GB, 12 core processor and created swap of size 8GB ?
16GB RAM is not sufficient ? or what could be the problem ?

Well the compiler clearly tells you that it does not have enough memory. So perhaps yes, 16GB may be too small. I don't know for sure, I never compile the web engine module when I compile Qt.

[prathyuch.1999]

@sierdzio
I increased my swap size again and it worked for me.
Thanks to all of you for your advice, finally i have successfully build and install Qt-6.5.2 in my Ubuntu PC.
I have successfully build and install QtCreator-11.0.3 also.
But now QtCreator-11.0.3 is not working properly, whenever i will click on gui components in left panel, QtCreator is getting crashed with message in terminal "Segmentation fault (core dumped)".
I am not able to drag and drop or put any gui widget in form(.ui file) in qtcreator, it's getting crashed immediately just after click on that.
What could be the error ? How to resolve this issue.

[sierdzio]

@prathyuch-1999 Just use a prebuilt Qt Creator, it's way easier.

[prathyuch.1999]

@sierdzio
pre-built QtCreator-11.0.3 open source, download link i am not getting

[sierdzio]

@prathyuch-1999 said in Building/installing Qt-6.5.2 from source on ubuntu-22.04:

@sierdzio
pre-built QtCreator-11.0.3 open source, download link i am not getting

Use Qt online installer, it's the easiest way and you will be getting updates as they are released: https://download.qt.io/archive/online_installers/4.6/

If you want offline installer of just Qt Creator, then: https://download.qt.io/official_releases/qtcreator/11.0/11.0.3/

[prathyuch.1999]

@sierdzio
Hi, I have already downloaded qt-creator-opensource-linux-x86_64-11.0.3.run from link you have suggested for offline installer.
But when i am running this executable, it's asking for registration or license type of stuffs.

Why for opensource QtCreator it's asking registration ? Earlier it was not such type of case, previously i was using QtCreator version-4.6.1.