Re: [Discuss-gnuradio] Link libraries to a OOT block

[James Austin]

Hi Martin,

I did look through the CMake documentation and was trying different things with the target_link_libraries tag, with no success.

What I am trying to do is (and this may be a solved problem already) build a gnuradio block for the RFSpaces SDR-IQ receiver. This is mostly for me to become more familiar with Linux programming and to learn more about Python.

I wrote a library that is able to retrieve data from the SDR-IQ and it is called libsdriq.a, now I want to use that library with gnuradio. Following the gnuradio tutorial on out of tree blocks, I created a block called gr-sdriq and it works fine with dummy data, has a complex output port and outputs a cosine and sine to the real and imaginary parts and I can see the data as expected in gnuradio. My problem is getting the gnuradio block  to use my libsdriq.a library and that is where things are breaking. Compiling is not a problem, but linking is not producing a gnuradio block that includes my libsdriq.a.

I've looked through some gnuradio blocks to see if I could find something similar and through CMake documentation. This is likely solved through CMake, but haven't figured it out yet.

Jim

On Sun, Dec 8, 2013 at 9:24 AM, Martin Braun (CEL) <address@hidden> wrote:

On Sat, Dec 07, 2013 at 08:40:45PM -0500, James Austin wrote:
> I'm a long time Windows programmer trying to write a gnuradio module to improve
> my Linux development skills.
>
> I created a gnuradio module following the tutorial that just sends dummy data
> back to gnuradio. That works fine, I can plot the dummy data in my flowgraph
> and it works and displays as expected.
>
> I also created a static library that produces data, no reason I can't make it a
> shared library if that is the solution.
>
> My problem is trying to get the gnuradio module to link against the static
> library, so that the data produced by this library can be fed into gnuradio. I
> haven't been able to figure out the cmake magic to make this happen. I get a
> variety of error messages on everything I try.
>
> Does anyone have any hints to get me past this?

Hey Jim,

you're not giving us much to work on here. You might want to specify
what exactly you're linking to, and what you've tried.

What you're trying to do seems like a cmake problem, so checking cmake
tutorials (unrelated to GNU Radio) might help.

Most often, you want your C++ blocks to access some library. This would
mean editing the lib/CMakeLists.txt file to make sure you're linking to
the right libs.

MB

--
Karlsruhe Institute of Technology (KIT)
Communications Engineering Lab (CEL)

Dipl.-Ing. Martin Braun
Research Associate

Kaiserstraße 12
Building 05.01
76131 Karlsruhe

Phone: +49 721 608-43790
Fax: +49 721 608-46071
www.cel.kit.edu

KIT -- University of the State of Baden-Württemberg and
National Laboratory of the Helmholtz Association

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