Re: undefined reference to `scm_init_guile'

[steven mestdagh <steven.mestdagh@esat.kuleuven.be>]

Neil Jerram [2006-03-11, 18:43:17]:
> steven mestdagh <steven.mestdagh@esat.kuleuven.be> writes:
> 
> > Neil Jerram [2006-03-10, 22:41:16]:
> >> 
> >> OK, so it's HAVE_LIBC_STACK_END that is not defined, then?  When this
> >> is the case, 1.8 leaves scm_init_guile undefined, whereas 1.6 would
> >> use the vast pile of magic in gc_os_dep.c.
> >
> > indeed this is a function we do not have.
> 
> Would you mind trying the program below on your system?  It may be
> that on OpenBSD the pthread approach works for the main thread, and so
> HAVE_LIBC_STACK_END isn't needed anyway.

$ cc -pthread -o pthrt pthrt.c -lpthread 
/tmp//ccd14895.o(.text+0x2c): In function `main':
: undefined reference to `pthread_getattr_np'

I don't really know much about threaded stuff, but you might want to
check the man pages for OpenBSD's pthreads library:
http://www.openbsd.org/cgi-bin/man.cgi?query=pthreads

> 
> (And interestingly, this program says that __libc_stack_end isn't
> needed on my Debian GNU/Linux, despite the comment in threads.c
> suggesting that it _is_ needed on Linux.)
> 
> Thanks,
>         Neil
> 
> 
> #include <pthread.h>
> 
> int main ()
> {
>   pthread_attr_t attr;
>   void *start, *end;
>   size_t size;
> 
>   pthread_getattr_np (pthread_self (), &attr);
>   pthread_attr_getstack (&attr, &start, &size);
>   end = (char *)start + size;
> 
>   printf("start = %p, &attr = %p, end = %p\n", start, &attr, end);
> 
>   if ((void *)&attr < start || (void *)&attr >= end)
>     printf("__libc_stack_end is needed\n");
>   else
>     printf("__libc_stack_end is NOT needed\n");
> 
>   exit (0);
> }
> 
> /* compile-command: cc -o pthrt pthrt.c -lpthread */

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