Re: [Discuss-gnuradio] Multiple C files required by single C++block.Howto build?

[Jonas Hodel]

Fantastic, works like a charm! I thought the problem was in the way I 
was using SWIG but the culprit was the C/C++ linkage. Now I can try it  
with my original files.

Thanks for all the help!

Jonas

Jan Schiefer wrote:
> > Finally: “make clean”, “make” and “make check”.
> >
> > This results in:
> >
> > ImportError: 
> > /home/jonas/gnuradio/gr-howto-write-a-block-3.0.2/src/lib/.libs/_howto.so: 
> > undefined symbol: _Z10jonas_testv
>
> What you need to do is to surround the declaration of jonas_testv() 
> with en extern "C" {} declaration. If you don't do this, then the 
> linker is looking for the "mangled name" , which is C++'s way to embed 
> type declarations in a function name. If the function is declared in 
> the .h as extern "C", it will just expect the function name with an 
> underscore in front of it, just like C does.
>
> Cheers,
>   Jan

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