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  • takgu
  • takgu
05 Oct 2025 09:23

Undefined Reference to hal_export_funct Linker Error in LinuxCNC HAL Component

Category: Installing LinuxCNC

LINUXCNC_HOME : /home/user1/linuxcnc

The Qt application now works correctly when I comment out the following two lines in the build configuration:

- LIBS += -L/home/user1/linuxcnc/rtlib -lhal_lib

- hal_export_funct.

Thanks
  • rodw
  • rodw's Avatar
05 Oct 2025 09:21

Undefined Reference to hal_export_funct Linker Error in LinuxCNC HAL Component

Category: Installing LinuxCNC

A bit left field but how did you install linuxcnc? If installed on Trixie and not the LinuxCNC ISO, did you
sudo apt install linuxcnc-uspace-dev
I think this is needed to get the required libs (certainly for halcompile)
The ISO installs linuxcnc-uspace-dev
  • yaska
  • yaska
05 Oct 2025 08:55 - 07 Oct 2025 09:43
Flex Gui Keyboard jog error was created by yaska

Flex Gui Keyboard jog error

Category: Flex GUI

  Flex gui 1.3.0 keyboard jog 
 I upgraded from 1.2.2 to 1.3.0 and received the attached error  message

File Attachment:

File Name: linuxcnc.report.txt
File Size:10 KB
.If I delete jog_modes_cb or jog_vel_sl from .ui, I can open the GUI, but a pop-up warns that jog_modes_cb is needed for jogging. All other functions work in the GUI except jogging. I tried a few Flex programs and they worked. If I load Ver1.2.2, everything works normally.  
  • takgu
  • takgu
05 Oct 2025 08:52

Undefined Reference to hal_export_funct Linker Error in LinuxCNC HAL Component

Category: Installing LinuxCNC

The reason I am using Qt C++ is that the existing external module, which was developed in C++, is incompatible with Qt Python (QtPy).

Thanks.
  • takgu
  • takgu
05 Oct 2025 08:34

Undefined Reference to hal_export_funct Linker Error in LinuxCNC HAL Component

Category: Installing LinuxCNC

/lib/linuxcnchal.so
- hal_export_funct - not exist

/rtlib/hal_lib.so
- hal_export_funct - exist

LIBS += -L$$LINUXCNC_HOME/lib -llinuxcnchal
LIBS += -L$$LINUXCNC_HOME/rtlib -lhal_lib

** Link Error when building qt app ('Not found -lhal_lib')

Thanks
  • unknown
  • unknown
05 Oct 2025 08:33
Replied by unknown on topic 7i76eu connection issues

7i76eu connection issues

Category: General LinuxCNC Questions

You can always reduce the size of the image.
  • Hakan
  • Hakan
05 Oct 2025 08:21 - 05 Oct 2025 08:22
  • wusel0464
  • wusel0464
05 Oct 2025 08:20
Replied by wusel0464 on topic Change camera resolution Qtdragon?

Change camera resolution Qtdragon?

Category: Qtvcp

Hello,

First of all, thank you very much for the quick reaction.
My concern is to exploit the dissolution of the chip for a more precise presentation. The zoom function built into Qtdragon is forced to invent pixels, but this is not significant to a small extent. There is not much to get out of a currently used resolution of 640x480 pixels. In the current situation, improvement would only be achieved by reducing the distance from the camera, but I come to areas where it becomes unhealthy for the camera.
My milling machine is just a cheese mill, but improving ease of use is nothing bad.
The picture of OpenCV has to be read somewhere, and couldn't you install these lines?

cap.set (cv2.cap_prop_frame_width, 1600)
cap.set (cv2.cap_prop_frame_height, 1200)

The values ​​are now mine and it works so far that the picture becomes visibly worse with small values.
Or how do you get Linux not to take the standard resolution?

Thank you for your efforts and all the best, Frank.
  • rodw
  • rodw's Avatar
05 Oct 2025 07:49
Replied by rodw on topic WiFi Problem on Raspberry Pi

WiFi Problem on Raspberry Pi

Category: General LinuxCNC Questions

you can get sma cables with a bulkhead adapter at one end. use that cable, attach to where the wifi antenna was, drill a hole in the cabinet and you can then attach your antenna to the extension cable.
  • rodw
  • rodw's Avatar
05 Oct 2025 07:26 - 05 Oct 2025 07:27
Replied by rodw on topic 7i76eu connection issues

7i76eu connection issues

Category: General LinuxCNC Questions

Clearly you are not understanding the basics of networking. Please watch my 7i76e video. Networking is covered about 17 minutes in from memory.
  • Ayden25
  • Ayden25
05 Oct 2025 06:51
Replied by Ayden25 on topic 7i76eu connection issues

7i76eu connection issues

Category: General LinuxCNC Questions

Thanks for the quick response

Okay I must have misread what others were saying it seemed like a wrong practice to run the same ip for two devices on the network.

I'd like to post a pic but the file size limit is to low here.

Hm2_eth: rtapi_app_main: Network is unreachable (-101)

That's the error I am getting

Still I'm not shure why I'm not getting different ip addresses from the mesa card regardless of jumper location.
  • takgu
  • takgu
05 Oct 2025 06:41

Undefined Reference to hal_export_funct Linker Error in LinuxCNC HAL Component

Category: Installing LinuxCNC

I am currently building a CNC control application using Qt C++ to control servo motors via EtherCAT.

I am encountering errors while attempting to execute the following HAL functions within my Qt code: hal_init, hal_ready, hal_export_funct, and hal_link.

Additionally, when I use the halcmd utility to add components or functions, I am unable to use (access) those resulting HAL pins/fields within my Qt C++ application.

Thank you.
  • unknown
  • unknown
05 Oct 2025 06:16

Undefined Reference to hal_export_funct Linker Error in LinuxCNC HAL Component

Category: Installing LinuxCNC

Is there any reason you can not use halcompile to build your component. As that is the "traditional" way to build components outside of the build process.
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