Re: glib CVS HEAD does not compile on powerpc (gatomic asm problem)

[Sebastian Wilhelmi <seppi seppi de>]

Moin Christof,

> On my G3 I get
> 
>   gcc -DHAVE_CONFIG_H -I. -I. -I.. -I.. -DG_LOG_DOMAIN=\"GLib\" 
> -DG_ENABLE_DEBUG -DG_DISABLE_DEPRECATED -DGLIB_COMPILATION -pthread 
> -Wall -mcpu=750 -pipe -MT gatomic.lo -MD -MP -MF .deps/gatomic.Tpo -c 
> gatomic.c  -fPIC -DPIC -o .libs/gatomic.o
> gatomic.c: In function `g_atomic_int_exchange_and_add':
> gatomic.c:274: error: inconsistent operand constraints in an `asm'
> 
> But I'm too ignorant of powerpc asm magic to fix it myself.
> 
>     Christof
> 
> PS: The code in question is
>    __asm __volatile ("1:       lwarx   %0,0,%3\n"
>                      "         add     %1,%0,%4\n"
>                      "         stwcx.  %1,0,%3\n"
>                      "         bne-    1b"
>                      : "=&b" (result), "=&r" (temp), "=m" (*atomic)
>                      : "b" (atomic), "r" (val), "2" (*atomic)
>                      : "cr0", "memory");

Hm, I just tested it again on the sourceforge compile farm's G4 (OSX)
and it works there. They are using gcc version-2.95. Maybe the new gcc
versions don't like the old constraints anymore, or the G3 needs other? 

Anyway the code was copied from glibc. See

	http://sources.redhat.com/cgi-bin/cvsweb.cgi/libc/sysdeps/powerpc/bits/atomic.h?rev=1.12&content-type=text/x-cvsweb-markup&cvsroot=glibc

This of course doesn't solve your problems ;-) But as they might have
the same problems on your platforms, maybe we could ask them. 

Where is your glibc from? Debian? The we could check the debian
diff-file for glibc.

Ciao,
Sebastian
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