If gcc is configured to generate i686 code or better by default (like

 when using the --with-arch=pentium3 configure option), then the __i686

 macro will always be defined automatically and thus screw up the

 compilation of some .S files.

 http://bugs.gentoo.org/131108

 http://sourceware.org/ml/libc-alpha/2006-04/msg00090.html

 2006-04-25  Mike Frysinger  <vapier@gentoo.org>

 	* sysdeps/i386/sysdep.h (__i686): Undefine.

 Index: glibc-2.4/sysdeps/unix/sysv/linux/i386/sysdep.h

 ===================================================================

 --- glibc-2.4/sysdeps/unix/sysv/linux/i386/sysdep.h	(revision 1469)

 +++ glibc-2.4/sysdeps/unix/sysv/linux/i386/sysdep.h	(working copy)

 @@ -29,6 +29,10 @@

  #include <dl-sysdep.h>

  #include <tls.h>

 +#if defined __i686 && defined __ASSEMBLER__

 +#undef __i686

 +#define __i686 __i686

 +#endif

  /* For Linux we can use the system call table in the header file

  	/usr/include/asm/unistd.h

 Index: glibc-2.4/nptl/sysdeps/pthread/pt-initfini.c

 ===================================================================

 --- glibc-2.4/nptl/sysdeps/pthread/pt-initfini.c	(revision 1469)

 +++ glibc-2.4/nptl/sysdeps/pthread/pt-initfini.c	(working copy)

 @@ -45,6 +45,11 @@

  /* Embed an #include to pull in the alignment and .end directives. */

  asm ("\n#include \"defs.h\"");

 +asm ("\n#if defined __i686 && defined __ASSEMBLER__");

 +asm ("\n#undef __i686");

 +asm ("\n#define __i686 __i686");

 +asm ("\n#endif");

 +

  /* The initial common code ends here. */

  asm ("\n/*@HEADER_ENDS*/");