Lazarus 3.2 on RasberryPi5

[PetrHlozek]

Hi,

I just bought RasbperryPi 5 and installed RaspbianOS and Lazarus.
Unfortunately it does not work at all. After start of the Lazarus itself, a small blank window appears that I have to close and Lazarus starts. It's happening even when I try to build simple application with just a form. After every run, a small empty window appears that I have to close or wait for a few seconds and it disappears. Look at the attachment.

I have this simple application: https://github.com/ok2cqr/cqrprop
It compiles fine but after trying to run, again, a small empty window appears and when I close it, the application crashes.

I tried to run the cqrprop in gdb and there is the result:

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Reading symbols from src/cqrprop...
(No debugging symbols found in src/cqrprop)
(gdb) r
Starting program: /home/ok2cqr/projects/cqrprop/src/cqrprop
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/arm-linux-gnueabihf/libthread_db.so.1".
[New Thread 0xf638a240 (LWP 8098)]
[Thread 0xf638a240 (LWP 8098) exited]
[New Thread 0xf638a240 (LWP 8099)]
[New Thread 0xf59ff240 (LWP 8100)]
[Thread 0xf638a240 (LWP 8099) exited]
[Thread 0xf59ff240 (LWP 8100) exited]

Thread 1 "cqrprop" received signal SIGSEGV, Segmentation fault.
0x0006bf70 in ?? ()
(gdb)


I tried versions 2.2.6, 3.2 and 3.4 with the same error message. The compilation of Lazarus went fine, I used make bigide.

Could you help me, please? Thanks a lot.

[zeljko]

Try to start app with cmd line option -disableaccurateframe. eg ./myapp -disableaccurateframe

[PetrHlozek]

That helped, the application is working! What does it mean? Is there any way how to compile application with this option build in? Thanks a lot!

[Thaddy]

It means that Wayland still has issues. You can also switch to X.

[PetrHlozek]

You are right, thanks. I didn't even know I'm on Wayland.

There is a small how to move to X11 on Raspberry Pi:

- open a terminal
- enter sudo raspi-config
- go to Advanced options -> Wayland and hit Enter
- there you can choose between X11 and Wayland, choose X11 and hit Enter
- then move to Finish and hit Enter, you'll be asked for a reboot

After the reboot, you'll be using X11 and Lazarus + all Lazarus applications will work.

Thank you for your help.

[Thaddy]

Glad to be of help.
Your write up is excellent and actually I should have done that!

Note that Wayland will still be the way to go in the near future. It is much faster except for remote access. So try every now and then for updates about the issues: they are known and not restricted to Lazarus.

Enjoy your Raspberry 5, I am an addict to those devices.

[zeljko]

You are right, thanks. I didn't even know I'm on Wayland.

There is a small how to move to X11 on Raspberry Pi:

- open a terminal
- enter sudo raspi-config
- go to Advanced options -> Wayland and hit Enter
- there you can choose between X11 and Wayland, choose X11 and hit Enter
- then move to Finish and hit Enter, you'll be asked for a reboot

After the reboot, you'll be using X11 and Lazarus + all Lazarus applications will work.

Thank you for your help.

hmmm...accurate frame should not trigger under wayland, that's lcl gtk2 bug. Please open an issue against gtk2 ws.

[pik33]

I created an issue. It needs to be repaired by detecting Wayland and not calling Gtk2WidgetSet.CreateDummyWidgetFrame while in Wayland. I still don't know whatthis call is for.

[Thaddy]

It is mainly to create a message pump without creating a visible widget. Something similar is used in Windows.
I have to investigate if this is proxied in Wayland...Which I still refuse to use as preference.