Telcon: 2023 09 27

Wednesday September 27th, 9am PT (UTC -7:00)

Attendees

• Peter Scheibel (host)
• Massimiliano Culpo
• Chris Green
• Marc Mengel
• Jakov Petrina

Agenda

This meeting is for Q&A: there are no pre-planned general topics.

• Chris: concretizer is claiming that external instance of gettext does not satisfy requirements for use
  • Something between 5/18 and now
  • Using Greg's error messages PR, still not sure
  • Massimiliano: from reading through packages.yaml I can see that the gettext external specifies constraints on a dependency
    • Spack does not (intentionally) support this
  • Chris: will try updating gettext ^libc to gettext, will try making the issue reproducible, continue conversation on slack
• Chris: when using a matrix, can't use "concretize:together", only "concretize:when_possible"
  • Prior to updating, were getting unwanted double-builds of packages (two builds with different hashes, but non-appreciable differences otherwise)
  • Marc: in particular, extra builds of CMake (not the only one but a definite example): Spack would rebuild CMake with different options and/or dependencies
    • When trying to reproduce, simplifying was not successful (each simplification made the rebuilds of CMake go away)
  • Chris: desire for a diagnostic tool to figure out why Spack is choosing to build these different versions
    • Peter: IMO it would be easier to add finer-grained constraints like "you can only build one instance of CMake"
  • Using #35975 (allows use of buildcache packages built on externals if the externals match)
    • Without this PR buildcache packages built against externals would never be reused
  • Massimiliano: could splicing help with this?
    • See also: https://github.com/spack/spack/pull/39136
  • Chris added a comment to #39136 post-meeting.