Re: SWIG doesn't recognize argument in make()

[Nick Foster]

You're not crazy. I've seen similar behavior. Does it work if you remove the underscore? The number?

Who can fathom the esoteric secrets of SWIG?

On Mon, Nov 16, 2020 at 3:06 PM Lukas Haase <lukashaase@gmx.at> wrote:

Additional detail: I tried it again:

$ gr_modtool rm tx_msg2tag
$
$ gr_modtool add test
$ rm -rf build; mkdir build; cd build; cmake ..; make

--> WORKS!!

$ gr_modtool add tx_msg2tag
$ rm -rf build; mkdir build; cd build; cmake ..; make

--> FAILS with the error below.


(of course, I edited the files to replace the <+...+> to make it compile).

It really seems it's the name of the block (tx_msg2tag) that makes things fail.
How can that be?

Lukas

Lukas wrote:
> Hi Cinaed,
>
> *I* am the author of gr-petro ;-)
> This is indeed a SWIG question. Or a question about OOT modules.
>
> I created the module with gr_modtool. I inserted bunch of blocks with "add"
> command. Just this one below does not work. I have no idea why (and it drives
> me crazy).
>
> Hence my questions:
> - What could be the issue?
> - What exactly generates *swigPYTHON_wrap.cxx files ?
> - How are the argument lists for the functions determined?
>
> Thanks,
> Lukas
>
>
>> Hi Lukas - gr-petro is a OOT module - an "out of tree "module - it's not
>> part of gnuradio.
>>
>> You need to contact the author of the module.
>>
>> It's highly unlikely it's a problem with make - it's more likely a
>> mismatch between gr-petro and your installed version of gnuradio.
>>
>> For instance, the OOT was written for a version of gnuradio prior to
>> 3.8.
>>
>> In any case, I couldn't find the gr-petro source code with a Google
>> search so I can't even guess what the problem might be. It also helps to
>> state which OS you're using.
>>
>> -- Cinaed
>>
>>> Hi everyone,
>>>
>>> It's driving me NUTS! SWIG just won't recognize an argument to my make()
>>> function and hence build fails. I have other nearly identical blocks in
>>> the same module that work without issues.
>>>
>>> What exactly generates the *swigPYTHON_wrap.cxx files and how are the
>>> argument lists for the functions determined?
>>>
>>> Here is how my make fails:
>>>
>>> [ 77%] Building CXX object
>>> swig/CMakeFiles/petro_swig.dir/CMakeFiles/petro_swig.dir/petro_swigPYTHO
>>> N_wrap.cxx.o
>>> /home/petro/src/gr38/gr-petro/build/swig/CMakeFiles/petro_swig.dir/petro
>>> _swigPYTHON_wrap.cxx: In function ‘PyObject*
>>> _wrap_tx_msg2tag_make(PyObject*, PyObject*)’:
>>> /home/petro/src/gr38/gr-petro/build/swig/CMakeFiles/petro_swig.dir/petro
>>> _swigPYTHON_wrap.cxx:18687:48: error: no matching function for call to
>>> ‘gr::petro::tx_msg2tag::make()’ 18687 | result =
>>> gr::petro::tx_msg2tag::make(); |
>>> ^ In file included from
>>> /home/petro/src/gr38/gr-petro/build/swig/CMakeFiles/petro_swig.dir/petro
>>> _swigPYTHON_wrap.cxx:2881:
>>> /home/petro/src/gr38/gr-petro/lib/../include/petro/tx_msg2tag.h:48:19:
>>> note: candidate: ‘static gr::petro::tx_msg2tag::sptr
>>> gr::petro::tx_msg2tag::make(unsigned int)’ 48 | static sptr
>>> make(unsigned int time_increment_factor); | ^~~~
>>> /home/petro/src/gr38/gr-petro/lib/../include/petro/tx_msg2tag.h:48:19:
>>> note: candidate expects 1 argument, 0 provided
>>> /home/petro/src/gr38/gr-petro/build/swig/CMakeFiles/petro_swig.dir/petro
>>> _swigPYTHON_wrap.cxx: In function ‘PyObject*
>>> _wrap_tx_msg2tag_sptr_make(PyObject*, PyObject*)’:
>>> /home/petro/src/gr38/gr-petro/build/swig/CMakeFiles/petro_swig.dir/petro
>>> _swigPYTHON_wrap.cxx:18914:30: error: no matching function for call to
>>> ‘gr::petro::tx_msg2tag::make()’ 18914 | result = (*arg1)->make();
>>> | ^ In file included from
>>> /home/petro/src/gr38/gr-petro/build/swig/CMakeFiles/petro_swig.dir/petro
>>> _swigPYTHON_wrap.cxx:2881:
>>> /home/petro/src/gr38/gr-petro/lib/../include/petro/tx_msg2tag.h:48:19:
>>> note: candidate: ‘static gr::petro::tx_msg2tag::sptr
>>> gr::petro::tx_msg2tag::make(unsigned int)’ 48 | static sptr
>>> make(unsigned int time_increment_factor); | ^~~~
>>> /home/petro/src/gr38/gr-petro/lib/../include/petro/tx_msg2tag.h:48:19:
>>> note: candidate expects 1 argument, 0 provided make[2]: ***
>>> [swig/CMakeFiles/petro_swig.dir/build.make:63:
>>> swig/CMakeFiles/petro_swig.dir/CMakeFiles/petro_swig.dir/petro_swigPYTHO
>>> N_wrap.cxx.o] Error 1 make[1]: *** [CMakeFiles/Makefile2:466:
>>> swig/CMakeFiles/petro_swig.dir/all] Error 2 make: *** [Makefile:141:
>>> all] Error 2
>>>
>>> As can be very, very clearly seen, tx_msg2tag::make(unsigned int) has
>>> ONE parameter (time_increment_factor). Yet SWIG wants to call
>>> gr::petro::tx_msg2tag::make().
>>>
>>> I have tried regenerating the file, deleting build directory and
>>> starting from scratch but this error follows me like a nightmare.
>>>
>>> Thanks for suggestions!
>>>
>>> Lukas