RFC: Support link with mixed IR/non-IR objects

[Alan Modra]

On Sun, May 06, 2012 at 01:52:17PM -0700, H.J. Lu wrote:
> This is a re-submit of implemenation of SHT_GNU_OBJECT_ONLY:
> 
> http://sourceware.org/ml/binutils/2011-04/msg00404.html

Nesting object files within other object files looks every bit as
horrible as it did first time around.

> The motivation is to provide transparent support for LTO with "ld -r".
> It is used for Linux kernel LTO build.

Yeah, I know.  The kernel build ought to use thin archives for
packaging object files instead, or even @ response files!

-- 
Alan Modra
Australia Development Lab, IBM