Re: [Discuss-gnuradio] Updating gr-specest to 3.7

[Tom Rondeau]

On Tue, Sep 17, 2013 at 2:34 PM, Jared Clements
<address@hidden> wrote:
> I've spent some time recently attempting to update gr-specest to 3.7,
> and I've run into a linker issue that's a bit out of my depth, any
> suggestions would be helpful.
>
> I've been following the guide published at
> http://gnuradio.org/redmine/projects/gnuradio/wiki/Move_3-6_to_3-7
>
> I have so far accomplished the following:
>  - Remove FindGnuradioCore.cmake and FindGruel.cmake, replaced with
> FindGnuradioRuntime.cmake
>    that I pulled out of
> gr-utils/python/modtool/gr-newmod/cmake/Modules/FindGnuradioRuntime.cmake
>  - Remove all GRUEL_ references and replace GNURADIO_CORE variables
> with GNURADIO_RUNTIME_
>  - Update #include<gruel/attributes.h> to <gnuradio/attributes.h>
>  - Changed file structure:
>    - from gr-specest/include/specest-blockname.h to
> gr-specest/include/specest/blockname.h
>    - from gr-specest/lib/specest-blockname.cc to gr-specest/lib/blockname.cc
>      (actually, I think that there was some significant changes that
> should have been done to split
>      blockname.cc into blockname_impl.h and blockname_impl.cc but I'm
> actually confused by all the
>      blockname_impl.h that are placed under include/specest, and I'm
> not entirely sure that the
>      split didn't already happen under 3.6)
>  - Updated gnuradio header files e.g. '#include <gr_sync_block.h>' to
> '#include <gnuradio/sync_block.h'
>  - Updated gnuradio classes and functions to new namespace, e.g.
> gr_make_io_signature() to gr::io_signature::make()
>
> Current status of the effort:
>  - Complilation errors caused by the need for above updates now worked
> out and the files compile without error.
>  - Build currently broken, stuck at linker errors:
>      ....
>      [ 52%] Built target gnuradio-specest
>      Linking CXX executable qa_arburg_impl
>      libgnuradio-specest.so: undefined reference to `fftwf_free'
>      libgnuradio-specest.so: undefined reference to `fftwf_malloc'
>      ....
>  - Will be looking into the FindGnuradioRuntime.cmake file I lifted
> from gr-utils
>  - Would love suggestions on how to debug this, "nm" and "ldd" show
> issues but not root causes...
>
> Future work not yet started:
>  - updating the gr-specest namespace to the new format
>  - adding new blocks:  cross-correlation, normalization, running sum, etc
>
> I've posted all my code at https://github.com/dfxx/gr-specest.  Any
> help tracking down the root cause of the linker errors would be
> greatly appreciated.  I have the feeling that it might be in the cmake
> configuration, and I feel somewhat like a bull in a china shop when I
> start poking around in cmake.  Lots of delicate looking code in there.

You'll (probably) need to link against fftw. I think you need to add
the FFT3 library to target_link_libraries in the lib/CMakeLists.txt
file. There was a change in policy for linking recently that's
affected things like this.

-- 
Tom
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