Heads-Up: early LTO debug to land, breaking Mach-O / [X]COFF

[Richard Biener]

This is a heads-up that I am in the process of implementing the last
of Jasons review comments on the dwarf2out parts of early LTO debug
support.  I hope to post final patches early next week after thoroughly
re-testing everything.

Note that Mach-O and [X]COFF support in the simple-object machinery
is still missing for the early LTO debug feature so I am going to
break LTOing with DWARF debuginfo on Darwin and Windows (CCing
maintainers).  Mach-O support has been worked on a bit by Iain
and myself but the simple-object piece is still missing.
A workaround is to use stabs on these targets with LTO.

DWARF part: https://gcc.gnu.org/ml/gcc-patches/2016-11/msg01023.html
simple-object part: 
https://gcc.gnu.org/ml/gcc-patches/2016-10/msg01733.html

both still apply with some fuzz.

Richard.