derek.holloway
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6.9 KiB
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76 lines
6.9 KiB
Markdown
<!--===- docs/MeetingNotes/2026/2026-01-28.md
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Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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See https://llvm.org/LICENSE.txt for license information.
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SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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-->
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# Combined Call 2026-01-28
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## Agenda
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* Design docs and/or RFCs
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* Flang failure with thin lto on LLVM 22-RC1 \- Thank you for fixing it\!
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* [https://github.com/llvm/llvm-project/issues/176404](https://github.com/llvm/llvm-project/issues/176404)
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* [\[RFC\] What to do regarding the Flang Call Notes document](https://discourse.llvm.org/t/rfc-what-to-do-regarding-the-flang-call-notes-document/89450)
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* Proposal: in the Flang repo
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* This Google doc becomes a working document for drafting the agenda, taking notes during the call
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* Post the agenda the day before the meeting, indicate to edit document directly with additional items or other changes, reply to the Slack post if that is not possible
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* flang/docs/MeetingNotes/YYYY/
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* files of finalized notes go in this directory, in a file like YYYY-MM-DD.md
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* flang/docs/MeetingNotes/README.md contains the boilerplate information, point to the GettingStarted.md document for call information to avoid tracking in two different places
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* [\[RFC\] Support classic flang driver options in flang](https://discourse.llvm.org/t/rfc-support-classic-flang-driver-options-in-flang/89380)
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* Suggestion was to accept the alternate spellings but give a deprecation warning immediately to encourage migrating to the regular spelling
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* Time frame for full deprecation/removal?
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* Should classic Flang be treated like a totally separate compiler, like Intel vs. Cray?
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* [\[RFC\] Automatic static promotion of large local variables in Flang](https://discourse.llvm.org/t/rfc-automatic-static-promotion-of-large-local-variables-in-flang/89539)
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* There is a similar issue with OpenMP privatize
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* Michael Kruse \- If you do this, you run out of stack space quite quickly. So the default should be on the heap, but with a flag to specifically put arrays (even of unknown size) on the stack
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* Ted Johnson \- Cray has flags for both behaviors, but there are a lot of flags to control the exact behavior (default is heap for certain use cases, stack for others)
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* Pthreads has a way to change the stack size via a function
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* What about executable stacks and how they factor in?
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* Flang-tidy
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* Meeting with authors has been deferred, will create meeting including Tarun Prabhu
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* [Cross-compilation of real(kind=16)](https://discourse.llvm.org/t/cross-compilation-of-real-kind-16/89161)
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* PR will come out, remaining issues can be resolved via that discussion
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* [\[RFC\] Support \-fstrict-aliasing and \-fno-strict-aliasing](https://discourse.llvm.org/t/rfc-support-fstrict-aliasing-and-fno-strict-aliasing/89135)
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* Related issue: [https://github.com/llvm/llvm-project/issues/171912](https://github.com/llvm/llvm-project/issues/171912)
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* We can’t do anything reasonable with it without violating the Fortran standard, will leave it open for a little while longer but likely will not support this
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* [Changes to builtin modules](https://discourse.llvm.org/t/changes-to-builtin-modules/89072)
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* PR was reverted due to buildbot failure involving Windows
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* Reviewers asked for big changes, working on a compromise involving putting TODOs in other runtimes
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* [\[RFC\] Add a New Byte Type to LLVM IR](https://discourse.llvm.org/t/rfc-add-a-new-byte-type-to-llvm-ir/89522)
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* Among other things, “Fixes known correctness bugs in memcpy lowering and load merging/widening”. Semantics are different from integer types and may allow other memory optimizations. This is a step towards eventual removal of Undef from LLVM-IR.
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* [Related group working towards a formal specification of LLVM-IR](https://discourse.llvm.org/t/rfc-forming-a-working-group-on-formal-specification-for-llvm/89056/4)
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* [\`-ffp-contract=fast\` Violates the Fortran Standard](https://discourse.llvm.org/t/ffp-contract-fast-violates-the-fortran-standard/88897)
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* Reply from the standards committee: [https://mailman.j3-fortran.org/pipermail/j3/2026-January/015531.html](https://mailman.j3-fortran.org/pipermail/j3/2026-January/015531.html)
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* PRs of Note
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* Tests from Cray’s CCE internal test suite in llvm-test-suite \[[PR](https://github.com/llvm/llvm-test-suite/pull/326)\]
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* Proposed directory structure with one test in linked PR
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* [\[Flang\]\[FIR\] Introduce FIRToCoreMLIR pass. \#168703](https://github.com/llvm/llvm-project/pull/168703)
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* Issues of Note
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* gcc warning suppression (Michael Kruse)
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* [https://github.com/llvm/llvm-project/pull/174918](https://github.com/llvm/llvm-project/pull/174918)
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* Also see [message](https://flang-compiler.slack.com/archives/C5C58TT32/p1769446659561029) in Slack \#general
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* FYI
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* [2026 EuroLLVM Developers' Meeting \- Registration Open\!](https://urldefense.com/v3/__https://discourse.llvm.org/t/2026-eurollvm-developers-meeting-registration-open/89557/1__;!!Bt8fGhp8LhKGRg!A1yd7PA_NA6qkPE3goiI1siQF7mKAnVnpOywFlJBmbQcFXDx25MhAH_tFbBKid5Fgp7F2Plqn6VULBMr0p8X3kyZUxvo58wA$)
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* Call for Mentors \- 2026 EuroLLVM Developers’ Meeting
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* [https://discourse.llvm.org/t/call-for-mentors-2026-eurollvm-developers-meeting/89484/](https://discourse.llvm.org/t/call-for-mentors-2026-eurollvm-developers-meeting/89484/)
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* Google Form here: [EuroLLVM Mentorship Program Application](https://docs.google.com/forms/d/e/1FAIpQLSfPmzaBfINmdO4ORs8fW5rXTphKaQLfhh45nYFh3IVKS1ZN7w/viewform)
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* [2026 LLVM Community Area Team Elections \- Voting is open\!](https://discourse.llvm.org/t/2026-llvm-community-area-team-elections-voting-is-open/89586)
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* Voting closes Feb 9
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* [LLVM 22.1.0-rc2 Released\!](https://urldefense.com/v3/__https://discourse.llvm.org/t/llvm-22-1-0-rc2-released/89590/1__;!!Bt8fGhp8LhKGRg!ABovo_Sh_W26Vzta9YaGsBfoijc8x9IdZeglz6_12Uk63RPwA3uaPmuiBfK_HAKBfAXkVh4l77XHKKfO9aepSUbPipT5YVix$)
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* The next release will be 22.1.0-rc3 on Tuesday the 10th of Feb
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* Who is writing the [flang release notes](https://github.com/llvm/llvm-project/blob/release/22.x/flang/docs/ReleaseNotes.md)?
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* [Improvement of Fujitsu test suite](https://discourse.llvm.org/t/improvement-of-fujitsu-test-suite/89475)
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* [\[RFC\] Use pre-compiled headers to speed up LLVM build by \~1.5-2x](https://discourse.llvm.org/t/rfc-use-pre-compiled-headers-to-speed-up-llvm-build-by-1-5-2x/89345/24)
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* Related to what has already been done in Flang, attempt to use this approach more generally
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* Added LoopInvariantCodeMotion pass for \[HL\]FIR. (PR \#[173438](https://github.com/llvm/llvm-project/pull/173438))
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* Other topics as time allows
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*
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## Details
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* Consists of over **721,000** lines of code, documentation, build files, and test
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* To date, over **11,703** commits have been made to Flang
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