[build] Move unwinder to toplevel libgcc (v2)

[Paolo Bonzini]

On 08/03/2011 03:32 PM, Rainer Orth wrote:
> It should incorporate all review comments and a few errors I've noticed
> during final review have been corrected.
>
> I've received approval for the Darwin bits, Steve successfully tested on
> HP-UX/IA64 and Linux/IA64 at least bootstrapped.  VMS/IA64 approval has
> been given conditional on the approval of the other IA64 bits.  I've
> also received approval for the libjava parts.
>
> Bootstrapped without regressions (together with the next two, to be
> resubmitted shortly: fp-bit and soft-fp moves) on
> x86_64-unknown-linux-gnu.
>
> i386-pc-solaris2.10, sparc-sun-solaris2.11, alpha-dec-osf5.1b,
> mips-sgi-irix6.5 and i386-apple-darwin9.8.0 bootstraps in progress.
> powerpc-apple-darwin9.8.0 currently broken (SIGBUS compiling
> c-family/c-pretty-print.c and cp/call.c).
>
> How should we proceed with this patch, especially given the quite
> moderate comments from most affected target maintainers?

ARM is the only target we should care a bit about.  Any chance you can 
try cross-compiling it (with a combined tree it should not be hard)? 
Just to see that it builds.

Paolo