Forum: GNU Radio Import error of grextras, undefined symbol

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?

--

Alex,
*Dreams can come true  just believe.*

On 02/19/2013 04:59 PM, Alex Zhang wrote:
> "/usr/local/lib/python2.7/dist-packages/gnuradio/extras/__init__.py", line
> 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

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 <josh@joshknows.com> wrote:

> > to import the extras_swig  like
> >     _extras_swig = swig_import_helper()
> Maybe its missing a library to link w/
> > Discuss-gnuradio mailing list
> > Discuss-gnuradio@gnu.org
> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> >
>
> _______________________________________________
> Discuss-gnuradio mailing list
> Discuss-gnuradio@gnu.org
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>



--

Alex,
*Dreams can come true  just believe.*

:-/

Well the symbol may be missing from gnuradio core. Can you tell me the
exact gnuradio commit you are using?

-josh

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 <cingular.alex@gmail.com> 
wrote:

>  endforeach(incdir)
>
>> trys
>> > line 26, in <module>
>>
>> > _______________________________________________
>
>
>
> --
>
> Alex,
> *Dreams can come true  just believe.*
>



--

Alex,
*Dreams can come true  just believe.*

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

I remember that I reinstall  to the latest gnuradio  entirely and then 
the
error disappeared.


On Mon, May 27, 2013 at 12:36 PM, Guy Holtzman <holtzi@gmail.com> wrote:

>
> >>> Done
> linux; GNU C++ version 4.6.3; Boost_104800; UHD_003.005.003-78-g49a4929b
>     from extras_swig import *
>
>>
>>> +++ b/swig/CMakeLists.txt
>>>
>>>> > final solution expressed clearly.
>>>> >     from extras_swig import *
>>>> > ImportError: /usr/local/lib/libgnuradio-extras.so: undefined symbol:
>>>>
>>>> _______________________________________________
>>> *Dreams can come true  just believe.*
>> Discuss-gnuradio mailing list
>> Discuss-gnuradio@gnu.org
>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>>
>>
>


--

Alex,
*Dreams can come true  just believe.*

I am already working with the latest version of GNU Radio.
in which dir the libgnuradio-extras.so should appear and, which package
bulids it? is this file bring renamed during the build?

try to remove all the existing gnuradio and then reinstall bu
./build_gnuradio.


On Mon, May 27, 2013 at 4:36 PM, Guy Holtzman <holtzi@gmail.com> wrote:

>>
>>>
>>>
>>> Executing: "/home/guy/Documents/tdma_radio.py"
>>> "/usr/local/lib/python2.7/dist-packages/gnuradio/extras/__init__.py", line
>>> ImportError: libgnuradio-extras.so: cannot open shared object file: No
>>>> Maybe it is due to my own building which is very obsolete. I will try
>>>>> index 129d789..42732a3 100644
>>>>>  set(GR_SWIG_DOC_DIRS
>>>>>> > I believe some other guys met this problem before, but I did not
>>>>>> "/usr/local/lib/python2.7/dist-packages/gnuradio/extras/__init__.py", line
>>>>>> > line 22, in swig_import_helper
>>>>>>
>>>>>> > Discuss-gnuradio@gnu.org
>>>>>
>>>> Alex,
>>
>> --
>>
>> Alex,
>> *Dreams can come true  just believe.*
>>
>
>


--

Alex,
*Dreams can come true  just believe.*

can it be a permission problem?
I tried added a print before the error and discovered this file it 
located
succesfully many times when I use grc:

/usr/local/lib/python2.7/dist-packages/gnuradio/extras/extras_swig.py
/usr/local/lib/python2.7/dist-packages/gnuradio/extras/_extras_swig.so
<open file
'/usr/local/lib/python2.7/dist-packages/gnuradio/extras/_extras_swig.so',
mode 'rb' at 0xd8ae288>
('.so', 'rb', 3)
/usr/local/lib/python2.7/dist-packages/gnuradio/extras/extras_swig.pyc
/usr/local/lib/python2.7/dist-packages/gnuradio/extras/_extras_swig.so
<open file
'/usr/local/lib/python2.7/dist-packages/gnuradio/extras/_extras_swig.so',
mode 'rb' at 0xd94a910>
('.so', 'rb', 3)
/usr/local/lib/python2.7/dist-packages/gnuradio/extras/extras_swig.pyc
/usr/local/lib/python2.7/dist-packages/gnuradio/extras/_extras_swig.so
<open file
'/usr/local/lib/python2.7/dist-packages/gnuradio/extras/_extras_swig.so',
mode 'rb' at 0xdfb1390>
('.so', 'rb', 3)
/usr/local/lib/python2.7/dist-packages/gnuradio/extras/extras_swig.pyc
/usr/local/lib/python2.7/dist-packages/gnuradio/extras/_extras_swig.so
<open file
'/usr/local/lib/python2.7/dist-packages/gnuradio/extras/_extras_swig.so',
mode 'rb' at 0xd94a860>
('.so', 'rb', 3)
/usr/local/lib/python2.7/dist-packages/gnuradio/extras/extras_swig.pyc
/usr/local/lib/python2.7/dist-packages/gnuradio/extras/_extras_swig.so
<open file
'/usr/local/lib/python2.7/dist-packages/gnuradio/extras/_extras_swig.so',
mode 'rb' at 0xd8d7288>
('.so', 'rb', 3)
/usr/local/lib/python2.7/dist-packages/gnuradio/extras/extras_swig.pyc
/usr/local/lib/python2.7/dist-packages/gnuradio/extras/_extras_swig.so
<open file
'/usr/local/lib/python2.7/dist-packages/gnuradio/extras/_extras_swig.so',
mode 'rb' at 0xd2970d0>
('.so', 'rb', 3)
/usr/local/lib/python2.7/dist-packages/gnuradio/extras/extras_swig.pyc
/usr/local/lib/python2.7/dist-packages/gnuradio/extras/_extras_swig.so
<open file
'/usr/local/lib/python2.7/dist-packages/gnuradio/extras/_extras_swig.so',
mode 'rb' at 0xdcef1d8>
('.so', 'rb', 3)
/usr/local/lib/python2.7/dist-packages/gnuradio/extras/extras_swig.pyc
/usr/local/lib/python2.7/dist-packages/gnuradio/extras/_extras_swig.so
<open file
'/usr/local/lib/python2.7/dist-packages/gnuradio/extras/_extras_swig.so',
mode 'rb' at 0xd297440>
('.so', 'rb', 3)

Generating: "/home/guy/.grc_gnuradio/tdma_hier.py"

Executing: "/home/guy/.grc_gnuradio/tdma_hier.py"

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

/usr/local/lib/python2.7/dist-packages/gnuradio/extras/extras_swig.pyc
/usr/local/lib/python2.7/dist-packages/gnuradio/extras/_extras_swig.so
<open file
'/usr/local/lib/python2.7/dist-packages/gnuradio/extras/_extras_swig.so',
mode 'rb' at 0x95b1078>
('.so', 'rb', 3)
Traceback (most recent call last):
  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 31, in <module>
    _extras_swig = swig_import_helper()
  File
"/usr/local/lib/python2.7/dist-packages/gnuradio/extras/extras_swig.py",
line 27, 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

>>> 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

/usr/local/lib/python2.7/dist-packages/gnuradio/extras/extras_swig.pyc
/usr/local/lib/python2.7/dist-packages/gnuradio/extras/_extras_swig.so
<open file
'/usr/local/lib/python2.7/dist-packages/gnuradio/extras/_extras_swig.so',
mode 'rb' at 0x9450078>
('.so', 'rb', 3)
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 31, in <module>
    _extras_swig = swig_import_helper()
  File
"/usr/local/lib/python2.7/dist-packages/gnuradio/extras/extras_swig.py",
line 27, 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


as you can see, when it does not work, file pointer is at a completely
different address (0x9######) and when it works the file pointer is at
address of 0xd######

also, I use tried to use sudo command, but it did not work.
any ideas?
Thanks for all the advice
Guy

the problem was the lack of ldconfig in the end of the installation
I used:
sudo ldconfig

after the installation of extras, and it solved the problem