Python embedded - linking problem on Linux - trying again

Jarkko Torppa torppa at staff.megabaud.fi
Wed Aug 14 17:37:54 CEST 2002


In article <3D5A7348.7010208 at kyborg.dk>, Kim Petersen wrote:
> Jarkko Torppa wrote:
>> In article <3D57BD22.8090305 at kyborg.dk>, Kim Petersen wrote:
>> 
>>>When creating an embedded python in an RM/Cobol-85 interpretor, i have 
>>>the following problem:
>>>
>>>It seems that i have to link all the modules (the .so's) that i need 
>>>with the new dynamic link library, isn't it at all possible to make it 
>>>(the python embedded interpretor) just find the .so's like the regular 
>>>interpretor does?
>> 
>> 
>> What is the error message when trying to import something that
>> is not linked in ?
> 
> Hmmm, interesting ... my embedded python has no possibility of writing 
> the errors (RM/Cobol limitation) - but when enforced to do so with a
> try-except with traceback print to file i was able to capture what i 
> haven't seen before ;-)
> 
> This is the traceback:
> 
> Traceback (most recent call last):
>    File "RM_Gui.py", line 17, in ?
>      import time
> ImportError: /usr/lib/python2.1/lib-dynload/timemodule.so: undefined 
> symbol: PyExc_IOError
> Traceback (most recent call last):
>    File "RM_Gui.py", line 32, in RM_GUI_avail
>      if sys.platform=='win32':
>    File "rmcobol85.py", line 6, in ?
>      import RM_Gui
>    File "RM_Gui.py", line 86, in ?
>      if __name__ == "__main__":
> TypeError: function takes at least 2 arguments (1 given)
> 
> PyExc_IOError seems to be the culprit ????

If that embedded python is also 2.1, then i guess: your linker
propably stripped it away as it was unused by the target that you
were creating.

There is this option in some version of GNU ld
       -export-dynamic
              When  creating  an ELF file, add all symbols to the
              dynamic symbol table.  Normally, the dynamic symbol
              table contains only symbols which are used by a dy-
              namic object.  This option is needed for some  uses
              of dlopen.

which (or something like it) I think that you will need.

> What do i look for? excepting these: (bit long trace below - which to me
> indicates that it actually found and opened the timemodule ????)

Yes that it seemed to do so it finds that from right place, no
other interesting information here.

-- 
Jarkko Torppa, Elisa Internet



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