This looks like a linker error.
In your main CMakeList.txt, you have to add DIGITAL to the line containing
set(GR_REQUIRED_COMPONENTS ...
If you already have that, sometimes make clean helps, when for some
reason linker/ccache/black magic involving CMake failed.
Greetings,
Marcus
On 07.10.2014 03:58, Zhe Feng wrote:
> Dear all,
>
> I'm trying to derive a *packet_header2* class in my own OOT module based on
> *gr::digital::packet_header_default*. I followed the way in
> *packet_heade_ofdm* of gr-digital and made packet_header2.h and
> packet_header2.cc in my own OOT module.
>
> But when I tried to import my_oot in python, it returned an undefined
> symbol error like this:
>
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> File "/usr/local/lib/python2.7/dist-packages/my_oot/__init__.py", line
> 45, in <module>
> from my_oot_swig import *
> File "/usr/local/lib/python2.7/dist-packages/my_oot/my_oot_cdma.py", line
> 26, in <module>
> _my_oot_swig = swig_import_helper()
> File "/usr/local/lib/python2.7/dist-packages/cdma/cdma_swig.py", line 22,
> in swig_import_helper
> _mod = imp.load_module('_my_oot_swig', fp, pathname, description)
> ImportError: /usr/local/lib/libgnuradio-my_oot.so: undefined symbol:
> _ZTIN2gr7digital21packet_header_defaultE
>
> I searched the list and found a previous answered question below
> http://gnuradio.4.n7.nabble.com/so-undefined-symbol-ZN2gr6blocks12count-bits16E-td46270.html
>
> where Marcus suggested editing the CMakeList.txt files by adding the module
> I needed. So I added
>
> *set(GR_REQUIRED_COMPONENTS RUNTIME DIGITAL)* in CMakeLists.txt.
>
> and then. This above error disappeared when I import my_oot again in
> python. But this problem isn't solved. I tried to access some functions of
> packet_header_default like formatter and base, it returned me an
> AtrributeError like this:
>
> AttributeError: 'packet_header2_sptr' object has no attribute 'formatter',
> which means the packet_header2 wasn't really a derived class of
> packet_header_default.
>
> I confirmed my conjecture by checking the
> /usr/local/lib/python2.7/dist-packages/my_oot/my_oot_swig.py where the
> classes are stored in python. I found that the class packet_header2 is
> defined as *class packet_header2(object)*. So the packet_header2 *isn't*
> installed as a derived class of *gr::digital::packet_header_default*. what
> I expected was *packet_header2(gr::digital::packet_header_default)*.
>
> So I'm asking you that how to correctly derive my class (eg:
> packet_header2) in my own oot module based on a class (eg:
> packet_header_default) in an existing module (eg: gr-digital)?
>
> My packet_header2.h and packet_header2.cc are attached for your reference.
>
> Thanks!
> Best,
> Zhe
>
>
>
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