Am Dienstag, den 18.05.2021, 07:15 -0400 schrieb Julien Lepiller: > The old scala is written in a superset of java5, that requires PiCo > to build, and PiCo was built with JaCo. They were developped at EPFL, > and you can find a binary for it, but no source: > http://zenger.org/jaco/ > > Apparently, JaCo was later reimplemented in Keris, whose source code > is available. However, KeCo (the Keris compiler) is written in Keris. > > It is not even clear that building an old version of scala is going > to work, as the language evolved a lot since then. > > I think the best way to bootstrap would be to reimplement Scala in > another language. I tried that too, but even the parser is crazy. Thanks Julien and Ricardo for the detailed explanation of what goes wrong here.
Would a bootstrap chain from 2.0.x work at least, so that the crazy Scala parser can target a specific (early) version and we get a slightly smaller binary or are the gains from that too minimal? This is also a concern going forward, can we always hope to "bootstrap" the next Scala version with the one currently packaged in Guix? > Le 18 mai 2021 05:44:42 GMT-04:00, Ricardo Wurmus <rek...@elephly.net > > a écrit : > > Leo Prikler <leo.prik...@student.tugraz.at> writes: > > > > > Hi Julien, > > > > > > Am Dienstag, den 18.05.2021, 01:01 +0200 schrieb Julien > > > Lepiller: > > > > Hi Guix! > > > > > > > > I have the attached file that build Scala, although it's not > > > > bootstrapped at all. It contains %binary-scala, a few > > > > dependencies of > > > > Scala we haven't packaged yet, and the final scala, built from > > > > %binary-scala, without sbt (which requires Scala too). > > > > > > > > Since I've tried and failed to bootstrap Scala for so long, I > > > > think > > > > it's time to give up. I can't always create miracles. > > > > > > Some points relevant to bootstrapping: > > > - The last version, that ships "scalai" written in Java seems > > > to > > > be > > > v1.4.0+4. Perhaps one can use scalai to bootstrap scalac > > > within it. > > > - The last version, that does not "require" sbt is 2.11.x, > > > though with your workaround we can also build later versions. > > > > We tried building a clean bootstrap chain for Scala for years. > > Back then I went down the rabbit hole and found that early scalac > > is written in Pizza; but it turned out that Pizza is written in > > Pizza and is released under the old Artistic License, which is > > considered non-free. > > > > https://logs.guix.gnu.org/guix/2018-04-08.log#230002 > > https://logs.guix.gnu.org/guix/2018-04-09.log#073740 > > > > I pointed a branch at an old Scala commit that contains the old > > Socos compiler source, which ostensibly are written in Java, but > > actually are not: > > > > https://github.com/rekado/scala-bootstrap/tree/bootstrap > > > > This is at around version 1.4.0.4, as you wrote above. > > > > Since the old days Scala Native has grown considerably, and > > perhaps we can reuse some of its native libraries. I’m not too > > hopeful, because the bulk of it is still written in Scala, > > obviously, but there are parts that are written in C / C++, which > > might come in handy. > > > > https://github.com/scala-native/scala-native
