Fwd: Getting undefined symbol

Oh, I see now ... I think you added a virtual class by defining something in telemetry.h, but there isn't actually any code to go with it. You might need a telemetry.cc somewhere? Not sure I'm getting the whole context here, though.

On Wed, Sep 13, 2023 at 4:48 PM Jeff Long <willcode4@gmail.com> wrote:

The mangled C++ symbol is vtable for gr::sidekiq::telemetry_impl. There's an online demangler at http://demangler.com/ if you don't have any tools installed that do that.

This most likely means that the sidekiq library is not getting linked to the GR block.

On Wed, Sep 13, 2023 at 5:33 PM Dave Helm <dave.helm@epiq-solutions.com> wrote:

Hello,

I am attempting to create an OOT module called telemetry that receives messages and does printf() when the message is received.  For now.

I am modeling it after your message_debug block found in gnuradio/blocks

It was working fine till I actually created the message functions.

It compiles and installs fine.  When I run gnuradio_companion no errors.

But when I execute my blocks I get this error:

Traceback (most recent call last):
  File "/home/dhelm/gr-sidekiq/examples/telemetry.py", line 34, in <module>
    from gnuradio import sidekiq
  File "/usr/local/lib/python3.8/dist-packages/gnuradio/sidekiq/__init__.py", line 18, in <module>
    from .sidekiq_python import *
ImportError: /usr/local/lib/libgnuradio-sidekiq.so.1.0.0: undefined symbol: _ZTVN2gr7sidekiq14telemetry_implE

I understand that there is some undefined symbol called, but I can't tell what it is from the name.  Is there a way to find out?

I ran into this issue when adding my message functions:

The message_debug has functions like:

void message_debug_impl::print(const pmt::pmt_t& msg)

void message_debug_impl::store(const pmt::pmt_t& msg)

These are defined in the message_debug_impl.h file. 

But not in the include/gnuradio/blocks/message_debug.h file.

When I do that with my functions I get a compile time error that the functions are not defined.  So I needed to add them to my include/gnuradio/sidekiq/telemetry.h file.

Then I did bind and cmake, make, sudo make install

I compiled and installed it.  But when I actually run the block I get the error listed above.

Any ideas?

Thanks,

Dave