----- Original Message ----- > On 08/20/2015 10:03 AM, Andrew Hughes wrote: > > ----- Original Message ----- > >> On 08/20/2015 09:27 AM, Andrew Haley wrote: > >>> On 08/20/2015 03:57 PM, Andrew Hughes wrote: > >>>> ----- Original Message ----- > >>>>> On 20/08/15 09:24, Matthias Klose wrote: > >>>>>> On 08/20/2015 06:36 AM, Tom Tromey wrote: > >>>>>>> Andrew> No, it isn't. It's still a necessity for initial > >>>>>>> bootstrapping > >>>>>>> of > >>>>>>> Andrew> OpenJDK/IcedTea. > >>>>>>> > >>>>>>> Andrew Haley said the opposite here: > >>>>>>> > >>>>>>> https://gcc.gnu.org/ml/gcc-patches/2015-08/msg00537.html > >>>>>> > >>>>>> if you need bootstrapping OpenJDK 6 or OpenJDK 7, then having gcj > >>>>>> available for the target platform is required. Starting with OpenJDK > >>>>>> 8 you should be able to cross build OpenJDK 8 with an OpenJDK 8 > >>>>>> available on the cross platform. It might be possible to cross > >>>>>> build older OpenJDK versions, but this usually is painful. > >>>>> > >>>>> Sure, but we don't need GCJ going forward. I don't think that there > >>>>> are any new platforms to which OpenJDK has not been ported which will > >>>>> require GCJ to bootstrap. And even if there are, anybody who needs to > >>>>> do that can (and, indeed, should) use an earlier version of GCJ. It's > >>>>> not going to go away; it will always be in the GCC repos. And because > >>>>> newer versions of GCC may break GCJ (and maybe OpenJDK) it makes more > >>>>> sense to use an old GCC/GCJ for the bootstrapping of an old OpenJDK. > >>>> > >>>> I don't see how we don't at present. How else do you solve the > >>>> chicken-and-egg situation of needing a JDK to build a JDK? I don't > >>>> see crossing your fingers and hoping there's a binary around > >>>> somewhere as a very sustainable system. > >>> > >>> That's what we do with GCC, binutils, etc: we bootstrap. > >> Right. So the question is there some reason why OpenJDK can't be used > >> to bootstrap itself? Ie, is there a fundamental reason why Andrew needs > >> to drop back down to GCJ and start the bootstrapping process from scratch. > >> > >> ISTM that ideally the previous version of OpenJDK would be used to > >> bootstrap the new version of OpenJDK. > >> > >> Which leaves the question of how to deal with new platforms, but it > >> sounds like there's a cross-compilation process starting with OpenJDK 8 > >> which ought to solve that problem. > >> > > > > The issue is that we're still supporting a version of OpenJDK/IcedTea where > > there is no previous version (6). Once that goes, gcj could go too. This > > is still just a little too soon. > But surely OpenJDK6 can build OpenJDK6, right? I don't see you're > fundamentally getting anything from always starting with a GCJ bootstrap. >
I'm talking about when you don't already have OpenJDK 6. > > > > That's where it comes unstuck. How do you get a JDK built when there are > > no JDK binaries for your architecture? > Cross compilation, just like folks do for Ada. > Which still needs a JDK somewhere and, as Matthias mentioned, the build system on older versions of OpenJDK (the ones were talking about) doesn't really support cross-compilation. I had to hack around just to get x86 on x86_64 to work. > > >> > > > > I'm not against this long-term, just not immediately. Deprecating it now > > and removing it in the next release cycle (7?) would probably be enough, > > but we need a little more time to wind down dependencies. I don't see us > > needing it in a GCC released in 2017. > I was of the opinion that we should remove it from the default languages > to be built. Others wanted to be more aggressive :-) I actually thought that change would have happened a long long time ago ;) I'm actually for the aggressive approach, just on a longer time scale, as I'll need time to transition IcedTea away from gcj. > > jeff > -- Andrew :) Senior Free Java Software Engineer Red Hat, Inc. (http://www.redhat.com) PGP Key: ed25519/35964222 (hkp://keys.gnupg.net) Fingerprint = 5132 579D D154 0ED2 3E04 C5A0 CFDA 0F9B 3596 4222 PGP Key: rsa4096/248BDC07 (hkp://keys.gnupg.net) Fingerprint = EC5A 1F5E C0AD 1D15 8F1F 8F91 3B96 A578 248B DC07
