Support installing headers for bootstrapping libgcc

[Chris Metcalf]

On 5/11/2012 2:37 PM, Roland McGrath wrote:
> I think we can just get rid of sln entirely at this point.  We really
> don't expect anybody to be able to run 'make install' directly on a
> live system and not ruin all sorts of things that might be needed
> somewhere in the process.  So why should ln be different?

I have in fact found it handy to have sln installed on my live system.  I
have at least once done an "ln -sf" to point /lib/libc.so.6 at a new
version and gotten it wrong, at which point you can't recover easily
without sln.

I don't think it's too unfortunate to have to build ldconfig and sln after
libgcc_eh is installed, as long as the procedure is clean and
well-documented, although I'd certainly much prefer a solution which
allowed them to be built in a single pass.

-- 
Chris Metcalf, Tilera Corp.
http://www.tilera.com