Custom component - addf failed

@beefy Thank you for your thoughtful observations and great suggestions. Hopefully one day we'll get there. Glad you figured it out!
Cheers

No probs Zdenek.

I also managed to fix the ilowpass issue, but no great suggestions to offer on that one. I'd had a dumb arse moment, and had it commented out in the hal file LOL.

same error in my hal file.

i just wrote a very simple comp, and installed it with sudo in terminal.
i ran linuxcnc app from desktop, then the same error reported.

BUT, it worked well in halrun.  I'm confused.

i've found the cause of the problem just right now.
it's UNDERLINE in the component's name.
remove them (both in code and filename), the function works!

but i'm still confused, why the other comps with same format in source code, they must be worked well in fact...

i'm poor in C/C++, just hope someone find the reason and fix it. Thanks~.~