Undefined Reference to hal_export_funct Linker Error in LinuxCNC HAL Component

Hello,I am encountering a persistent linker error while building a HAL component for LinuxCNC, despite correctly identifying the location of the required function. I would appreciate any assistance from members who have experience using . 1. The Problem I am trying to link my component, but the build fails with an "undefined reference" error for a HAL API function. 2. The Setup and Findings ItemDetailsInitial Linker Option Error Message Source of ErrorI confirmed that the function is not defined in .Function LocationI found that is defined in the real-time library: .Attempted FixI updated the linker options in my build system (a file using qmake) to include both libraries: and .Resulting ErrorThe linker now reports that it cannot find the library.
Sheets로 내보내기 3. The Core Issue The linker path to the directory ( ) is accurate, and the library file ( ) containing the function is confirmed to exist there. However, the build system or linker seems unable to successfully link .Could this issue be related to:

1. A specific linker flag order required for real-time libraries?
2. A misunderstanding of how the HAL and RTAPI libraries should be linked together (especially since
   Code:

   hal_init
   is present in both
   Code:

   liblinuxcnchal.so
   and
   Code:

   hal_lib.so
   )?
3. An incorrect way to specify the library name (
   Code:

   -l
   ) when using an absolute path or a custom library path (
   Code:

   -L
   ) in the build system?

Any guidance on how to correctly force the linker to recognize and use for would be greatly appreciated.Thank you.

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.

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.

The libs are not actually in /lib and /rtlib are they?

/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

Is there any reason you're not using something such as linuxcnc.org/docs/2.9/html/gui/qtvcp.html

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.

LINUXCNC_HOME then, what is its value?

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

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