[CC’ing the debian-s390@lists.debian.org list; s390 folks, please keep the bug in CC on replies] Dear Graham, On Tue, Sep 12, 2017 at 07:28:04PM +0200, Graham Inggs wrote: > Source: openblas > Version: 0.2.20+ds-1 > Severity: wishlist > From Changelog.txt in OpenBLAS 0.2.20: > > IBM Z: * New target z13 with BLAS3 optimizations > > I have just checked, and openblas/0.2.20-3 builds successfully on > zelenka.debian.org. > Please enable building on s390x. Unfortunately it does not look that simple. OpenBLAS is optimized for z13, but our s390x port is supposed to support all the z systems (see [1]). In particular, the OpenBLAS build system adds the "-march=z13 -mzvector" compilation flags. If I remove them, then the package fails to build on zelenka: it complains about unknown assembly instructions, which are not present on old z-systems. This is the proof that OpenBLAS cannot produce a binary generic enough for our s390x port. So unless I am missing something, it’s not possible to enable building for s390x until 1) OpenBLAS supports older z-systems or 2) the hardware requirements for the Debian s390x port are upgraded. Best, [1] https://www.debian.org/releases/stable/s390x/ch02s01.html.en#idm45373715987328 -- ⢀⣴⠾⠻⢶⣦⠀ Sébastien Villemot ⣾⠁⢠⠒⠀⣿⡁ Debian Developer ⢿⡄⠘⠷⠚⠋⠀ http://sebastien.villemot.name ⠈⠳⣄⠀⠀⠀⠀ http://www.debian.org
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