Linux and tmux compatibility

The baseline is stable Perl 5.44.0 on Linux x86_64 LP64, including WSL. Supported tmux versions span 3.3a–3.8, including every intermediate release. Plain tmux 3.3 is below the 3.3a support floor. Other operating systems and Linux ABIs have not been qualified. The supervisor refuses unsupported ABIs before dispatch instead of assuming syscall numbers.

CI and the local compatibility command use only the latest stable Perl and two tmux releases: the oldest supported release and the newest stable release. The current pins are Perl 5.44.0, tmux 3.3a, and tmux 3.8, verified on 2026-11-08. Testing the range endpoints keeps CI small; intermediate tmux releases remain supported without separate CI cells. Older Perl releases have no matrix cells. Update the pins when the latest stable release changes.

The source lock pins official assets, archive hashes, source commits, and configure flags. Per-build provenance adds compiler and executable hashes. Exact per-cell results are recorded by the compatibility command; a missing or skipped cell remains unverified. Earlier wider matrix runs remain historical evidence for their recorded revisions; they do not add current completion gates.

$ mise exec -- make compatibility

The original 3.3a run exposed tmux’s invalid-layout error-pointer defect. The public select_layout wrapper now rejects unknown/ambiguous names lacking a custom-layout checksum prefix before dispatch. The raw command escape hatch retains native behavior. See the contributor guide for archive consumers, examples, units, and the network-free check/provision split.

A local test or build is not hosted CI, a CPAN publication, or a deployed site. No unrun final-revision gate is implied by these requirements.