Flang Biweekly Sync - Notes from the February 5th, 2020 call

Subprojects Flang
1

Flang team,

Here are the notes from the February 5th, 2020 Flang biweekly call.

The next Flang Technical Community call is scheduled for Monday, February 10th, 8:30 AM Pacific Time. We will probably continue discussions about the status of the flang upload to the LLVM monorepo. Craig Rasmussen will also give a brief overview of the source transformation work that they are doing, and solicit feedback on that.

The next Flang biweekly call will be Wednesday, February 19th, 2020 at 8:30 AM Pacific Time.

Logistics information for these calls is at the end of this email.

Thank you.

Gary Klimowicz

Agenda

  • ECP Annual Meeting Feb 3-7
  • Euro LLVM April 6-7, Paris, France
  • Continue discussing merging process and status
  • F18 development update
  • Flang development update

Highlights

  • ECP Annual Meeting February 3-7, 2020, Houston Texas

  • The Compiler Will Help You! The LLVM Compiler Infrastructure in ECP, Thursday Feb 6, 2020, 1:30 PM - 3:00 PM

  • A Flang poster (Alexis Perry-Holby and Flang team) has been created.

  • There will be a Flang side meeting right after Thursday’s LLVM breakout session for an informal discussion, around 3 PM.

  • Euro LLVM

  • Let us know about the talks and meetings and we will publicize them here.

  • See the details below for the list of talks.

  • Flang Community Technical Biweekly Call

  • The next call is scheduled for Monday, February 10th.

  • Status update on the process for uploading Flang to the LLVM monorepo.

  • Using flang in a source-to-source rewriting scheme (Craig Rasmussen and Kate Rasmussen)

  • New Flang update

  • We continue to work through expectations and issues regarding flang’s readiness to be pulled into the LLVM monorepo. This was the bulk of the topic of today’s call.

  • File suffix changes have been made (.cpp instead of .cc).

  • Cmake changes have been incorporated.

  • Other requests include things like greater use of LLVM data structures and file handling. There was a lot of discussion about this on the call today, particularly regarding what appears to be contradictory advice from the “LLVM community”. Several suggestions are being incorporated into flang.

  • See the detailed notes below for other Flang development updates.

  • Original Flang Dev news and updates

  • We will be providing access for additional committers to the project. There was discussion today around this process. Arm has submitted a list of additional committers for current Flang.

  • Each team will continue to test their proposed changes internally using their internal test infrastructure.

  • This should help with the queue of pull requests that are outstanding for Flang.

  • NVIDIA will continue to push fixes for GitHub issues to flang.

  • Kiran Chandramohan presented a talk on Flang: The Fortran frontend of LLVM at FOSDEM. Here’s the link to talk: https://fosdem.org/2020/schedule/event/llvm_flang/ (which also contains a link to his slides).

Where we can use your help

  • Topics for the biweekly calls and technical community calls.
  • Let us know if you have presentations or meetings relevant to the Flang community. We will publicize these in these notes.

**Details (**Updates below are in bold)