Telcon: 2022 08 03

(Held August 3rd 2022)

Attendees

• Peter Scheibel (host)
• Davide DelVento
• Mark Krentel
• Massimiliano Culpo
• Phil Regier
• Srinath Vadlamani
• Tammy Dahlgren
• Wileam Phan

Agenda items

• Davide: Jupyter
  • Users want to change between different Pythons
  • This can be achieved by switching environments (i.e. Spack environments with different Pythons)
  • However env activate triggers an error: requires Spack's shell support.
  • Phil: bash -vx can be used to debug shell expansions
    • or set -vx inside your script (e.g. on the first line of your script)
• Mark Krentel:
  • Check in on "config requirements" PR
  • Could preferences in a package.py file be expanded?
    • For now:
      • Can set a preferred version
      • Can set preferred
    • It would also be useful to:
      • Set properties on dependencies
  • What about conflicts (i.e. if two packages prefer something about a dependency, then which one "wins"?)
  • Related: 31261 (from Massimiliano)
• Currently there is no way to specify preference that override reuse
• Davide: if I have a production install of Spack at 0.18, and I want to update Spack to 0.18.1, what do I need to be careful about?
• Wileam: https://github.com/spack/spack/pull/30954
  • Do we wait for something generic, or push this in the meantime

Possible Agenda items

• (Massimiliano) Continue from https://github.com/spack/spack/wiki/Telcon%3A-2022-06-08: multiple build systems used by one package
• (Matt) if we build an environment, and one package fails, then module files are not generated
  • Want spack module refresh but only to generate module files that haven't been generated yet
• Updating compiler wrapper to strip -Werror (optionally): https://github.com/spack/spack/pull/30284
• (Wileam) Adding fpm as a build system
  • Issue on fpm repo: https://github.com/fortran-lang/fpm/issues/79
• Default action for concretization in environments: https://github.com/spack/spack/pull/29942#issuecomment-1097287194
• Continue from https://github.com/spack/spack/wiki/Telcon%3A-2022-04-06: warning() directive
• (Wileam) Can't bootstrap llvm@13 and @14 if gold is enabled (which is the default behavior) https://github.com/spack/spack/issues/29350
  • Pinpointed issue to external package (binutils carried by OS) based on comment
  • PR drafted: https://github.com/spack/spack/pull/30954
  • Can externals detection be expanded from executables only to arbitrary files (e.g. header or .a/.so library files)?
• Continue from https://github.com/spack/spack/wiki/Telcon%3A-2022-04-13: not in spec syntax