[Xenomai-help] undefined reference __xnarch_xchg_called_with_bad_pointer

[Xenomai-help] undefined reference __xnarch_xchg_called_with_bad_pointer

[Roderik_Wildenburg]

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 ?

Thank you
Roderik

----------------------------------
> make
ppc-linux-gcc -g -o satch satch.c -I. -I/home/arowil/mc45/xenomai/_install/include -g -D_GNU_SOURCE -D_REENTRANT -D__XENO__ -Wall -pipe -D__XENO_UVM__  -u__xeno_skin_init -L/home/arowil/mc45/xenomai/_install/lib -luvm -lnucleus -lpthread -lvxworks 
/home/arowil/mc45/xenomai/_install/lib/libnucleus.a(module.o)(.text+0x9d0): In function `__xchg':
../../src/include/asm/xenomai/atomic.h:162: undefined reference to `__xnarch_xchg_called_with_bad_pointer'
/home/arowil/mc45/xenomai/_install/lib/libnucleus.a(module.o)(.text+0x9d0):../../src/include/asm/xenomai/atomic.h:162: relocation truncated to fit: R_PPC_REL24 __xnarch_xchg_called_with_bad_pointer
/home/arowil/mc45/xenomai/_install/lib/libnucleus.a(pod.o)(.text+0x6974): In function `__xchg':
../../src/include/asm/xenomai/atomic.h:162: undefined reference to `__xnarch_xchg_called_with_bad_pointer'

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Re: [Xenomai-help] undefined reference __xnarch_xchg_called_with_bad_pointer

[Heikki Lindholm]

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