Developer Meeting Agenda 2026-09-27 - 20:00 CEST

[grandixximo]

According to our bi-weekly schedule alternating between "early" and "late", this video meeting is next Sunday 2026-Sep-27 at 20:00 CEST.

https://greenlight.bbb.uni-rostock.de/b/ste-c4d-brs-3k6
Access code: 869782

https://www.timeanddate.com/worldclock/meetingdetails.html?year=2026&month=9&day=27&hour=18&min=0&sec=0&p1=319&p2=236&p3=240&p4=136&p5=165&p6=256

I will not be able to attend this one. Anything on my PRs can go in the PR threads and I will pick it up the next day. Please write the conclusions into this agenda as usual.

Agenda

1. hal: Break the HAL API - Move to 64-bit exclusively #4565 HAL API break, 64-bit only. The big one from the plan agreed last meeting (item 4 of Developer Meeting Agenda 2026-09-13 - 10:00 CEST #4497). First review round done Sep 19, all points fixed on the branch. Points to settle:

   • Testing status on real hardware. Who has run the branch on what? So far RPi5 + 7I96S + Modbus by @BsAtHome. Tcl 8.6 still uses a 32-bit internal representation (64-bit only in Tcl 9), so Tcl-side configs deserve a look.
   • Merge criteria and timing. Do we merge as soon as CI and a few hardware reports are green, or wait for a fixed date?
   • ~pre2 version bump and tag. @BsAtHome holds the bump for the docs PR and wants to tag the tree once all the changes are in, so the CI packages carry the right version. Agree on the tag point.
   • Docs PR follows separately (per the PR description). Order of merge relative to the code.
   • Config migration tooling: hal: Add halfileupdate to convert HAL configuration files #4499 (halfileupdate) is draft until the renaming is settled, which hal: Break the HAL API - Move to 64-bit exclusively #4565 settles. Same for hal: Add halcompupdate to migrate .comp files to the new HAL API #4256 (halcompupdate). Do we want these in before or right after the break so users are not left without a converter?
   • hm2_modbus .mbccb files need recompiling from .mbccs after the break; where do we tell users (release notes, NEWS, docs)?
   • After the merge: many hal_[gs]et_[us]i32() remain, the tree is not 64-bit clean yet. That is the third phase from last meeting; who takes which components?

2. Signed vs unsigned integers in HAL, discussion The unsigned integer question #4526. Follow-up to the question from @rene-dev. The in-tree evidence is in the discussion; do we keep both sint and uint or fold to one?

3. Branch protection, discussion Branch Protection #4558. "Require branches to be up to date" was turned off again. Do we make rip-and-test (or more) a hard requirement, or keep CI as a strong signal with an escape hatch for infrastructure flakes?

4. Include layout, include: use angle brackets for exported headers, and check it #4375 and include: move the exported headers into a directory of their own #4461. Last meeting decided to move all includes after the 64-bit migration. Confirm the order: hal: Break the HAL API - Move to 64-bit exclusively #4565 first, then include: move the exported headers into a directory of their own #4461, then the angle-bracket check include: use angle brackets for exported headers, and check it #4375.

5. Wayland. gremlin: host the GTK preview on Gtk.GLArea without GLX #4538 hosts the GTK gremlin on Gtk.GLArea without the GLX dlopen hack; @alex-pres reports pncconf and gremlin run on Weston with it, which makes Wayland fix (namely pncconf's sample panel) #4523 unnecessary. The remaining X11-only pieces are GtkSocket in gmoccapy and everything Tk. Do we want a tracking issue for native Wayland?

6. hostmot2 driver fixes, fix safety and correctness bugs in hostmot2 drivers #4488 by @sleepybishop. @BsAtHome asked for a split (sserial and abs_encoder need hardware testing, pktuart/eth can go in a first batch). The author is waiting for guidance on how to split. Can we give a concrete list?

7. PRs
   See PRs for merge/comments.

   • feat(rs274ngc): add ROTARY_MODULO axis mode #3969 ROTARY_MODULO: open for review since Aug 16, no review yet.
   • halcompile: reject declarations that claim the same HAL name #4298 halcompile duplicate HAL names: rebased and all four review points addressed on Sep 18, @BsAtHome reviewing. halcompile: reject declarations that export the same HAL name (2.9 backport) #4299 is the 2.9 backport, @BsAtHome does not think it should be backported.
   • tp: keep the G33 sync origin on the spindle index #4453 G33 sync origin on the spindle index: rebased Sep 13, consecutive G33 verified unchanged, ready to merge.
   • hm2_eth: Xenomai4 OOB improvements #4503 hm2_eth Xenomai4 OOB: tested by @zz912, initf hm2_eth.realtime-init no longer needed. Two-board case untested. hm2_eth: Create support library's #4498 (hm2_eth support libraries) is the design discussion with @BsAtHome about exporting the API from the existing posix/xenomai libraries instead of new .so files.
   • axis: read the program the config opens once the HAL is whole #4507 axis: read the config's program once the HAL is whole. No review yet.
   • Add spindle angle offset (D word) for G33 and G76 threading #4519 spindle angle offset (D word) for G33/G76: Fix spindle position-sync jitter and catch infeasible thread pitches #4441 is in, tp: keep the G33 sync origin on the spindle index #4453 is not; rebase after tp: keep the G33 sync origin on the spindle index #4453 lands.
   • hal, gmoccapy: a SIGTERM during startup no longer leaves the GUI running #4532 hal, gmoccapy SIGTERM during startup: @BsAtHome's os._exit() concern addressed, timer gone. Ready to merge.
   • Fix invalid escape sequences in holecircle and plasmac2 #4536 invalid escape sequences in holecircle and plasmac2: trivial, ready to merge.
   • gremlin: host the GTK preview on Gtk.GLArea without GLX #4538 gremlin on Gtk.GLArea: needs testers on different GPUs and drivers before merge.
   • interp: G43.4 and G49 as spellings over the kinematics switch #4548 G43.4 and G49 over the kinematics switch: rebased on the merged task: a kinematics selection is seen on the next line, and the test reads it there #4563/tests: kins-switch holds the joints from the program's own switch to identity #4564, C-linkage remark addressed, mergeable.
   • kinematics: a Jacobian entry point, supplied by every module #4550 kinematics Jacobian entry point: out of draft since kinematics: six fixes found by round-tripping every module #4546 merged, CI green, ready for review.
   • twp: split the machine maths out of the tilted work plane remap #4551 twp remap split: @BsAtHome's questions answered, mergeable.
   • Draw (WORKPIECE,...) stock as a translucent solid #4552 WORKPIECE stock as translucent solid: liked by @andypugh and @hansu, keys renamed to OD and ID as suggested.
   • gcode: estimate how long a program takes during the parse #4554 program time estimate during parse: under test, question on what the display shows after an error or a stop.
   • Gmoccapy: value checks on table entries #4559 gmoccapy value checks on table entries: use_localization put back after @BsAtHome's comment.
   • hal: Break the HAL API - Move to 64-bit exclusively #4565 HAL API break: see item 1.

8. ini parser identifiers vs the xhc-hb04 pendant, inifile: accept dash in section and variable identifiers #4573. The new ini parser restricts identifiers to letters, digits and underscore; that broke the xhc-hb04 sample configs (dashed [XHC_HB04_BUTTONS] keys like start-pause) and the pendant comp's own layout cfg files ([XHC-HB04] section). @BsAtHome: dropping the dash was intentional, the pendant was missed. Options: accept the dash again (inifile: accept dash in section and variable identifiers #4573 restores the old behavior, currently draft), or deliberately rename all pendant identifiers to underscores with migration coverage for INI keys, layout cfg files and HAL pin names (xhc-hb04.button-start-pause), in line with the other 2.10 breaks (hal: Break the HAL API - Move to 64-bit exclusively #4565). Decide direction.