SWIG doesn't recognize argument in make()

[Lukas Haase]

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_swigPYTHON_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_swigPYTHON_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