[build] Move unwinder to toplevel libgcc (v2)

[Joseph S. Myers]

On Thu, 11 Aug 2011, Paolo Bonzini wrote:

> 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.

Actually I think the installation of all the installed target headers 
should move to libgcc's Makefiles (and the headers themselves should move 
under the libgcc/ directory).

-- 
Joseph S. Myers
joseph@codesourcery.com