Hi all, The Debian s390x port currently officially defaults to the z900 ISA. That's what our GCC defaults too, but I wouldn't be surprised if a few packages use a slightly newer ISA.
Unfortunately more and more packages require a newer ISA, usually at least z196. This is the case of at least nodejs, go and rustc. It should be noted that it's not a question of passing the right flag to GCC, but rather these packages have their own JIT compiler which has been written for a z196 ISA minimum. For go we currently use gccgo instead of golang, which is not really an optimal solution and prevents many packages to build. For the same reason rustc is not available on s390x, which might become problematic soon (for example rsvg will require it soon). Finally recent versions of nodejs require at least a z196 CPU, so we have to drop all nodejs packages if we want to keep the baseline as z900. In my opinion we don't really have any other choice than raising the minimum ISA to z196, even if this CPU is less than 7 years old. The the only other alternative I can think about would be to have people committing to maintain patches lowering the minimum ISA for the above packages. I started to work on that for go a few months ago, but unfortunately that's a huge work as upstream keeps moving. The ISA change would be done in testing/unstable and released for Buster. Stretch would be unchanged in that regard and it will continue to be supported for 2 more years. Note also that it means that we would have to get rid of our older build daemon, zemlinsky.d.o. We would still have 2 buildd daemons in 2 different locations left, which is enough to run the port. However that would be appreciable to get a third one to fully secure the port. Any opinion, or alternative solution? Thanks, Aurelien -- Aurelien Jarno GPG: 4096R/1DDD8C9B aurel...@aurel32.net http://www.aurel32.net
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