Re: [Discuss-gnuradio] Can't Make Any OOT Block Depending on Blocks with X in name

[Marcus Müller]

Hi Sean,

GNU Radio is not handling "X" or anything else in names with special care. (Yes, there's a few blocks that exist as source code templates that we run python scripts over in the build process to actually generate the _c, _f, _b and so on, but this is really not the case here).

This looks much more like a linking error – did you add "FILTER" to the list of "GR_REQUIRED_COMPONENTS" in the main CMakeLists.txt of your OOT?

Note that "howto" sounds a bit like our slightly outdated introduction to writing OOT blocks – things should work, but I personally prefer the newer, better-maintained http://tutorials.gnuradio.org .

Best regards,

Marcus

On 17.12.2016 00:35, Sean Horton wrote:

I have already made some OOT blocks, so I should have the basic process down, but I can't find out why using any blocks in a hier block with X in the name, which indicates an input, output, and/or parameter can be of multiple types, results in undefined references to the make functions.

I have tried using the not_bb block in gnuradio/blocks, diff_encoder_bb in gnuradio/digital, and freq_xlating_fir_filter_ccf in gnuradio/filter. I can use these blocks in python without incident, but making a hier block using those types of blocks is not working. I run the built in default tests, and they all fail because of an undefined references to code in gnuradio, which I have already built from source.

For example, this is from the test logs:

undefined symbol: _ZN2gr6filter27freq_xlating_fir_filter_ccf4makeEiRKSt6vectorIfSaIfEEdd

After using c++filt:

gr::filter::freq_xlating_fir_filter_ccf::make(int, std::vector<float, std::allocator<float> > const&, double, double)

This is the entire contents of a source file I've made trying to resolve this issue:

#include "test_xx_impl.h"                                                        

                                                                                 

#ifdef HAVE_CONFIG_H                                                             

#include "config.h"                                                              

#endif                                                                           

                                                                                 

#include <gnuradio/filter/freq_xlating_fir_filter_ccf.h>                         

#include <gnuradio/io_signature.h>                                               

namespace gr {                                                                   

namespace howto {                                                                

                                                                                  

test_xx::sptr test_xx::make() {                                                  

  return gnuradio::get_initial_sptr(new test_xx_impl());                         

}                                                                                

                                                                                 

test_xx_impl::test_xx_impl()                                                     

    : gr::hier_block2("test_xx", gr::io_signature::make(1, 1, sizeof(uint8_t)),  

                      gr::io_signature::make(1, 1, sizeof(uint8_t))) {           

  filter::freq_xlating_fir_filter_ccf::sptr testing =                            

      filter::freq_xlating_fir_filter_ccf::make(1, {1}, 10000, 1000000);         

}                                                                                

 41                                                                                  

 42 } /* namespace howto */                                                          

 43 } /* namespace gr */   

Regards,

Sean

--

Sean Horton

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