Flang Biweekly Sync - Notes from August 7, 2019 call

Flang team,

Here are the notes from the August 7th, 2019 Flang biweekly call. Updates are in bold.

Please be sure to let us know if you have any questions and agenda topics for the next call.

The next Flang biweekly call will be August 21st, 2019 at 8:30 AM Pacific Time.

Thank you.

Gary Klimowicz


  • Flang Community Technical Call – OpenMP discussion
  • F18 development update
  • Flang development update


  • Supercomputing 2019

  • Hal submitted for an LLVM BoF session at SC 2019.

  • There won’t be an LLVM in HPC Workshop this year.

  • Flang Community Technical Biweekly Call

  • Hal Finkel is hosting this call on Bluejeans, Wednesdays 8:30 Pacific Time, the weeks alternating with this call. The notes for all these calls can be found in Google Docs here.

  • The July 31st call had Arm and NVIDIA presenting plans for OpenMP implementation for F18.

  • The next call is scheduled for August 14th, 8:30 AM PDT. The scheduled agenda topic is aliasing information and LLVM enhancements.

  • F18 as an LLVM project

  • The LLVM-hosted flang-dev mailing list has been set up. Subscribe at https://lists.llvm.org/cgi-bin/mailman/listinfo/flang-dev.

  • We will continue to support the original flang-dev@lists.flang-compiler.org through August 2019.

  • Plan is still to upload documentation for F18 before the code, to help establish the project goals and design strategy before uploading the code. This should help establish context for the project.

  • F18 update

  • Working on allowing forward references to derived types in component definitions.

  • Improved handling of generics with the same name as a type or procedure.

  • Implemented folding of LBOUND and UBOUND intrinsics.

  • Extracting binary-to-decimal and decimal-to-binary conversion code so it can also be used in runtime.

  • Made pull requests to MLIR to help support Fortran Intermediate Representation.

  • More work on DO loop semantics and constraint checking, including DO CONCURRENT locality specifications.

  • More work on OpenMP directive parsing and semantic checks, including OpenMP parse tree node definitions and parsing.

  • Flang Dev news and updates

  • More bug fixes in queue to send to Flang.

  • Improved build support for Windows and Mac.

Where we can use your help

  • Subscribe to the new LLVM Flang email list: https://lists.llvm.org/cgi-bin/mailman/listinfo/flang-dev. We will be cross-posting to both flang-dev mailing lists until September.
  • Please provide any additional feedback to the RFC regarding the compiler driver submitted to flang-dev. The thread can be found in the cfe-dev email list here.
  • Please comment on the DEBUG metadata enhancement proposed for LLVM (CHARACTER intrinsic type). This is the last Flang debug metadata enhancement that has not been upstreamed to LLVM: https://reviews.llvm.org/D54114.
  • Topics for the next biweekly community call and technical community call.
  • Let us know if you have presentations or meetings relevant to the Flang community. We will publicize them in these notes.