On Fri, 12 May 2017, Richard Biener wrote: > > 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.
The patches have been applied now (r251220). You'll see -flto -g testcases on the above archs fail (I'm still curious how exactly). There's going to be a "workaround" I plan to apply no earlier than stage3, it will effectively force -g0 on those targets when you use DWARF. Seeing the FAILs might be enough hunch to look into the (small) task of implementing the simple-object implementation of simple_object_copy_lto_debug_sections for your object format. Richard.
