Re: [Discuss-gnuradio] Import error of grextras, undefined symbol

[Guy Holtzman]

I am having the same issue, I tried Josh suggestion without success.

I have installed Extras and pre-cog using:
https://github.com/jmalsbury/pre-cog/wiki/Installation

what should I do to make it work?

here is a error log containing the versions I am using:

linux; GNU C++ version 4.6.3; Boost_104800; UHD_003.005.003-78-g49a4929b

<<< Welcome to GNU Radio Companion 3.6.4.1 >>>

Loading: "/home/guy/Documents/tdma_hier.grc"
>>> Done

Showing: "/home/guy/Documents/tdma_hier.grc"

Loading: "/home/guy/Documents/tdma_radio.grc"
>>> Done

Showing: "/home/guy/Documents/tdma_radio.grc"

Generating: "/home/guy/Documents/tdma_radio.py"
>>> Warning: This flow graph may not have flow control: no audio or usrp blocks found. Add a Misc->Throttle block to your flow graph to avoid CPU congestion.

Executing: "/home/guy/Documents/tdma_radio.py"

linux; GNU C++ version 4.6.3; Boost_104800; UHD_003.005.003-78-g49a4929b

Traceback (most recent call last):
  File "/home/guy/Documents/tdma_radio.py", line 8, in <module>
    execfile("/home/guy/.grc_gnuradio/tdma_hier.py")
  File "/home/guy/.grc_gnuradio/tdma_hier.py", line 14, in <module>
    import gnuradio.extras as gr_extras
  File "/usr/local/lib/python2.7/dist-packages/gnuradio/extras/__init__.py", line 20, in <module>
    from extras_swig import *
  File "/usr/local/lib/python2.7/dist-packages/gnuradio/extras/extras_swig.py", line 26, in <module>
    _extras_swig = swig_import_helper()
  File "/usr/local/lib/python2.7/dist-packages/gnuradio/extras/extras_swig.py", line 22, in swig_import_helper
    _mod = imp.load_module('_extras_swig', fp, pathname, description)
ImportError: libgnuradio-extras.so: cannot open shared object file: No such file or directory

Thanks, Guy

On Wed, Feb 20, 2013 at 8:22 PM, Alex Zhang <address@hidden> wrote:

Maybe it is due to my own building which is very obsolete. I will try to reinstall the latest version of gnuradio and grextras.

On Tue, Feb 19, 2013 at 5:35 PM, Alex Zhang <address@hidden> wrote:

It does not work after the modification and rebuilding of the grextras.

My modification:

diff --git a/swig/CMakeLists.txt b/swig/CMakeLists.txt
index 129d789..42732a3 100644
--- a/swig/CMakeLists.txt
+++ b/swig/CMakeLists.txt
@@ -58,7 +58,7 @@ foreach(incdir ${GRUEL_INCLUDE_DIRS})
     list(APPEND GR_SWIG_INCLUDE_DIRS ${incdir}/gruel/swig)
 endforeach(incdir)
 
-set(GR_SWIG_LIBRARIES gnuradio-extras)
+list(APPEND GR_SWIG_LIBRARIES gnuradio-extras ${GNURADIO_CORE_LIBRARIES} ${G
 set(GR_SWIG_DOC_FILE ${CMAKE_CURRENT_BINARY_DIR}/extras_swig_doc.i)
 set(GR_SWIG_DOC_DIRS ${CMAKE_CURRENT_SOURCE_DIR}/../include/gnuradio/extras)

On Tue, Feb 19, 2013 at 5:06 PM, Josh Blum <address@hidden> wrote:

On 02/19/2013 04:59 PM, Alex Zhang wrote:
> Hi,
>
> I believe some other guys met this problem before, but I did not find the
> final solution expressed clearly.
>
> After I installed the gnuradio, grextras, then in my python code which trys
> to import the extras_swig  like
>
>     import gnuradio.extras as gr_extras
>   File
> "/usr/local/lib/python2.7/dist-packages/gnuradio/extras/__init__.py", line
> 20, in <module>
>     from extras_swig import *
>   File
> "/usr/local/lib/python2.7/dist-packages/gnuradio/extras/extras_swig.py",
> line 26, in <module>
>     _extras_swig = swig_import_helper()
>   File
> "/usr/local/lib/python2.7/dist-packages/gnuradio/extras/extras_swig.py",
> line 22, in swig_import_helper
>     _mod = imp.load_module('_extras_swig', fp, pathname, description)
> ImportError: /usr/local/lib/libgnuradio-extras.so: undefined symbol:
> _ZN15gr_msg_accepter4postEN5boost13intrusive_ptrIN3pmt8pmt_baseEEES4_
>
>
> Can any one shed a light on it?

Maybe its missing a library to link w/

Can you try this and let me know?

http://pastebin.com/t5GL5Z6G

-josh
>
>
>
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>

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--

Alex,

Dreams can come true – just believe.

--

Alex,

Dreams can come true – just believe.

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