Re: [Discuss-gnuradio] where is usrp2_make_source_32fc actually defined?

[Josh Blum]

Maybe you have a typo from copying the usrp2 code, or didnt fill in the 
make function in a cc file. The compiler wont catch something like that 
unless you try to call the make function in some example c++ app. See 
gr-usrp2/src/usrp2_source_32fc.cc

usrp2_source_32fc_sptr
usrp2_make_source_32fc(const std::string &ifc, const std::string &mac_addr)
  throw (std::runtime_error)
{
  return gnuradio::get_initial_sptr(new usrp2_source_32fc(ifc, mac_addr));
}

-Josh

On 01/18/2010 10:38 AM, Tom Gross wrote:
> I've been trying to create a usrp2 dual source class for a number of
> weeks now, and I've come to realize there is something fundamental
> about this development environment that I don't understand.
>
> Basically i've been installing gnuradio and grc on a variety of Ubuntu
> machines buy building gnuradio-3.2.2 thus:
>
> cd gnuradio-3.2.2
> ./configure --prefix=/usr
> make
> sudo make install
>
> I've also been making custom blocks using gr-howto-write-a-block-3.2.2.
>
> Lately I've tried to create usrp2_dsource_16sc and
> usrp2_dual_source_32fc (slightly different naming conventions just to
> see if it would make a difference) in gnuradio-3.2.2/gr-usrp2/src by
> mimicing exactly how it is done for the existing single-channel
> classes.
>
> Everything builds, but at run-time I am getting an "ImportError"
> symbol undefined for _Z23usrp2_make_dsource_16scRKSsS0_
>
> I did an "nm -a _usrp.so | grep make" in
> /usr/lib/python2.6/dist-packages/gnuradio and see this:
>
> 0000d1b3 T _Z12make_int_ptrv
> 0000d238 T _Z13make_long_ptrv
> 0000d12e T _Z15make_uint16_ptrv
>           U _Z20usrp2_make_sink_16scRKSsS0_
>           U _Z20usrp2_make_sink_32fcRKSsS0_
>           U _Z22usrp2_make_source_16scRKSsS0_
>           U _Z22usrp2_make_source_32fcRKSsS0_
>           U _Z23usrp2_make_dsource_16scRKSsS0_
>           U _Z27usrp2_make_dual_source_32fcRKSsS0_
> 0000d1d7 t _wrap_make_int_ptr
> 0000d25c t _wrap_make_long_ptr
> 0000d152 t _wrap_make_uint16_ptr
>
> What I've noticed now is that even in the original _usrp2.so built
> from the unmodified gnuradio-3.2.2 source, which works, the make
> methods for sink and source appear to be undefined, according to "nm
> -a".
>
> So where are they defined?  I'm hoping that if I knew how these
> methods are resolved at run-time in the "off-the-shelf" version of the
> code, I would see why modified code is not working.
>
> -Tom
>
>
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