[build] Move unwinder to toplevel libgcc (v2)

[Paolo Bonzini]

On 08/11/2011 04:25 PM, Joseph S. Myers wrote:
> >  The actual problem are not the runtime libraries, which already know to
> >  search $builddir/.../libgcc for unwind.h and related files.  The
> >  copyback is only for the benefit of the testsuite (gcc.target, g++.dg,
> >  gnat.dg, and gcc.dg) where I was too lazy to deal with changing (or even
> >  setting ) the include paths, but took the easy way out since gcc/include
> >  is in the include path by default.
>
> unwind.h is an installed header.  Are you sure nothing outside of GCC uses
> it?

Why does it matter?  It is still installed in trunk, and you could also 
move the installation to libgcc's Makefiles if it weren't copied anymore 
to $builddir/gcc/include.

Paolo