Hello! On September 20, 2019 5:38:38 PM GMT+02:00, Jeff Law <l...@redhat.com> wrote: >So this message is serving as official notice that we are *deprecating* >all cc0 support in gcc-10. We are not removing any code or targets at >this time -- removals would happen during the gcc-11 cycle. > > >avr >cris >h8300 >m68k >vax >cr16 > >This is based on actually looking at the backend patterns. >backends.html indicates the mn103 port would be affected, but I think >it's just out-of-date. Similarly it fails to mention cr16, but cr16 >clearly has affected patterns (I'll address that separately) > >This patch deprecates the affected targets. With some magic folks can >continue to build them. However, if nobody steps forward to convert >them from cc0 to MODE_CC those targets will be removed during the >gcc-11 >cycle.
We have raised $5000 to support anyone willing to work on this for the m68k target [1]. We really need the m68k to stay as it's essential to be able to compile for Linux/m68k, NetBSD/m68k and AROS/m68k (a new and ABI-compatible AmigaOS clone). I'm sure other communities like in the NeXTStep, Atari and Mac/m68k forums are interested in keeping the backend as well. I'm confident we will be able to raise even more money as the community is large and active. >If someone is interested in possibly doing a conversion, I would >strongly recommend reviewing the best documentation we have on the >subject: > >https://gcc.gnu.org/wiki/CC0Transition > >I worked with my son about a year ago to transition the v850 to MODE_CC >using that page as a guideline. We also have a partial transition for >the H8/300 port (not far enough to even build anything yet). I had >hoped we would finish the H8/300 port last year and would have tackled >another, but events have gotten in the way. Any chance that the unfinished code can be shared? I'm looking for any blueprints that can be used as a guidance for the work on the m68k backend. I have also created a guide on how to set up a QEMU virtual machine running a fully fledged Debian/m68k which can be used for the development work [2]. >The transition isn't terribly hard, but does take time because of the >number of patterns that have to be changed. I have already looked at the conversion done on the V850 backend [3] but so far I don't understand enough of the register representation stuff to be able to know where to start. I'm seeing that all the "cc" attributes are being removed but not replaced? Adrian > [1] > https://www.bountysource.com/issues/80706251-m68k-convert-the-backend-to-mode_cc-so-it-can-be-kept-in-future-releases > [2] https://wiki.debian.org/M68k/QemuSystemM68k > [3] > https://github.com/gcc-mirror/gcc/commit/d6c5e987e730b3b2b9ff396d2361518ff9cb5e23 -- .''`. John Paul Adrian Glaubitz : :' : Debian Developer - glaub...@debian.org `. `' Freie Universitaet Berlin - glaub...@physik.fu-berlin.de `- GPG: 62FF 8A75 84E0 2956 9546 0006 7426 3B37 F5B5 F913
