Re: AW: [Xenomai-help] undefinedreference __xnarch_xchg_called_with_bad_pointer

[Philippe Gerum <rpm@xenomai.org>]

Heikki Lindholm wrote:
> Uh. I guess the compiler isn't killing the *_bad_pointer function as 
> dead code when debug is enabled (although it is dead-code.)

The optimizer is disabled by --enable-debug so that we don't get strange jumps 
while tracing with GDB, I guess that's why the dead code is not eliminated. What 
about just killing this check, since the same code is already validated when 
compiling it as a kernel module? (except asm-uvm/system.h, but that's not important).

  As a
> work-around, I think, you could just comment the line, where 
> *_bad_pointer is called.
> 
> -- Heikki Lindholm
> 
> Roderik_Wildenburg@domain.hid kirjoitti:
> 
>> You are right, but who is somebody ?  The example definitly does not 
>> call any xchg-function directly. The only thing I did, was to activate 
>> debugging and recompile all the libraries (make clean; configure 
>> --debug-enable;  make ) and soon I get this error message when 
>> compiling the demo (I don´t get an error message when debugging is 
>> disabled) . Amazingly I don´t get this error message when compiling 
>> the native examples (ksrc/skins/native/demos) (debug enabled).
>> Any ideas ?
>>
>> Roderik
>>
>>
>>
>>
>>> -----Ursprüngliche Nachricht-----
>>> Von: xenomai-help-bounces@domain.hid
>>> [mailto:xenomai-help-bounces@domain.hid] Im Auftrag von Heikki Lindholm
>>> Gesendet: Dienstag, 28. Februar 2006 15:48
>>> An: Wildenburg, Roderik RAEK3 MRA
>>> Cc: xenomai@xenomai.org
>>> Betreff: Re: [Xenomai-help] undefinedreference 
>>> __xnarch_xchg_called_with_bad_pointer
>>>
>>> Roderik_Wildenburg@domain.hid kirjoitti:
>>>
>>>> Dear Gurus,
>>>>
>>>> I have compiled ppc(!)-xenomai with debug information 
>>>
>>>
>>> (configure --enable-debug), so far so good (compiling of xenomai 
>>> itself and it´s libraries, testsuite etc. was successful). 
>>>
>>>> Buuuut ..., when compiling the vxWorks-demos 
>>>
>>>
>>> (ksrc/skins/vxworks/demos/*.c), I get an error message about an 
>>> undefined refernce __xnarch_xchg_called_with_bad_pointer. I searched 
>>> for this mysterious function, but could only find it in 
>>> asm-powerpc/atomic.h, where it is declared as external (extern void 
>>> __xnarch_xchg_called_with_bad_pointer(void);).
>>>
>>>> Does anybody know, where I can get the implementation of 
>>>
>>>
>>> this function, or what I have to do else to get rid of the error 
>>> message ?
>>>
>>> You might also want to read the comment near the extern declaration 
>>> of the function in atomic.h, where it says that the function is not 
>>> even intended to be implemented. The error means somebody called 
>>> *atomic_xchg with wrong arguments (or there's something else wrong 
>>> like inlines not working).
>>>
>>> -- Heikki Lindholm
>>>
>>> _______________________________________________
>>> Xenomai-help mailing list
>>> Xenomai-help@domain.hid
>>> https://mail.gna.org/listinfo/xenomai-help
>>>
> 
> 
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-- 

Philippe.