Remove unused fork implementations

[David Miller]

From: "Joseph S. Myers" <joseph@codesourcery.com>
Date: Tue, 24 Apr 2012 20:04:07 +0000 (UTC)

> There are various implementations of fork under sysdeps/unix that are
> unused: Linux architectures all use versions under
> nptl/sysdeps/unix/sysv/linux and Hurd also has its own version.
> 
> I propose this patch to remove the unused implementations.  Tested
> x86_64.  David, could you review the removal of the SPARC versions?

The sysdeps/unix/sparc/fork.S should not be used at all.

> (I'd also encourage looking at sysdeps/unix/sparc to see if anything
> else there is unused and should be removed.)

sysdeps/unix/sparc/sysdep.S is unused, overridden by:

	sysdeps/unix/sysv/linux/sparc/sysdep.c

sysdeps/unix/sparc/brk.S is unused, overridden by:

	sysdeps/unix/sysv/linux/sparc/sparc32/brk.c
	sysdeps/unix/sysv/linux/sparc/sparc64/brk.S

sysdeps/unix/sparc/dl-brk.S is unused, overridden by:

	sysdeps/unix/sysv/linux/sparc/sparc64/dl-brk.S
	sysdeps/unix/sysv/linux/dl-brk.c

sysdeps/unix/sparc/pipe.S is unused, overridden by:

	sysdeps/unix/sysv/linux/sparc/sparc32/pipe.S
	sysdeps/unix/sysv/linux/sparc/sparc64/pipe.S

sysdeps/unix/sparc/vfork.S is unused, overridden by:

	sysdeps/unix/sysv/linux/sparc/vfork.S

That leaves sysdeps/unix/sparc/sysdep.h which is used, by:

	sysdeps/unix/sysv/linux/sparc/sparc32/sysdep.h
	sysdeps/unix/sysv/linux/sparc/sparc64/sysdep.h

Should I move the contents of sysdeps/unix/sparc/sysdep.h into
sysdeps/sparc/sysdep.h?

The PIC bits are OS neutral, but the system call stuff is "UNIX"
specific.

So, maybe put the PIC bits into sysdeps/sparc/sysdep.h and put the
syscall stuff into sysdeps/unix/sysv/linux/sparc/sysdep.h?