TheRock/compiler/amd-llvm/flang/docs/MeetingNotes/2025/2025-12-17.md

Combined Call 2025-12-17

Agenda

• No meeting on 12/31
• Update on meeting notes document
  • What will protect the data if something should happen to Discourse?
  • RFC is a good idea
• Design docs and/or RFCs
  • Changes to builtin modules
    • PR was reverted due to buildbot failure involving Windows
    • Undergoing another review process, will not try landing again until after the first of the year
  • [RFC] Proposing an Interactive Fortran Workflow with Flang using Jupyter Notebooks
    • Intention is to build a flang-repl in the context of Jupyter Notebooks
    • Seems unclear what the authors expect from the greater Flang community
    • Looking for assistance with making changes to flang to make the repl work and/or for info about what barriers exist to creating it in the first place (possibly also looking for funding)
    • Unsure why they are choosing to use Flang instead of continue the LFortran work
      • Possibly to do with level of standards compliance
  • [RFC] Support -fstrict-aliasing and -fno-strict-aliasing
    • Related to an issue that came in, these flags are supported in both gcc and clang
    • Would affect type-based alias analysis
    • Does this have any implications for Fortran code specifically? Does it violate the standard?
    • Michael Klemm can ask some gfortran developers directly
    • Related issue: https://github.com/llvm/llvm-project/issues/171912
  • `-ffp-contract=fast` Violates the Fortran Standard
    • Still under debate
• PRs of Note
  • [flang][driver] Do not allow -module-dir to be joined to the value #168748
  • Currently, although it is a long-form option, the value is joined to it
  • Likely, we will not be able to add options that start with -module-dir given the current implementation
  • Changing this will affect CMake usage (CMake PR to use the -J option has been accepted, but not backported to older versions)
  • Potential compatibility problem with gfortran
  • [Flang][FIR] Introduce FIRToCoreMLIR pass. #168703
• Issues of Note
  • Building Flang with offload support
• FYI
  • LLVM - Document the community RFC process
  • 2026 EuroLLVM Developers' Meeting - Call for Proposals
• Other topics as time allows
  • Flang-tidy update next time
  • Fujitsu test suite discussion next time (how to make it easier for people to use)

Details

• Consists of over 707,000 lines of code, documentation, build files, and test
• To date, over 11,511 commits have been made to Flang