Add avr-none triple support - #3950
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The avr-none triple is a two-component bare-metal target used for AVR microcontrollers (e.g. ATtiny10, AVR128DB28). Like wasm32v1-none and the ARM Thumb targets, it does not fit the standard three-component arch-vendor-system format, so it needs a dedicated special case.
UebelAndre
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April 7, 2026 13:17
stefanbucur
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Jun 19, 2026
rules_rust 0.70.0 (released 2026-04-22) includes the avr-none triple support from bazelbuild/rules_rust#3950, so the version pin is now sufficient and no git_override is needed. All Rust targets updated to edition 2024.
This was referenced Jul 31, 2026
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Problem: The
triple()parser inrust/platform/triple.bzlfails onavr-nonebecause it only has two components separated by-, which does not match the expectedarch-vendor-system[-abi]format. The function hits thefail()guard at the bottom that requires at least 3 components.Solution: Add a special case for
avr-nonealongside the existing ones forwasm32v1-noneand the ARM Thumb targets.Additional context:
avr-noneis the standard Rust target triple for AVR bare-metal targets (ATtiny, ATmega, AVR-DA series, etc.). Without this fix, any project using rules_rust with an AVR toolchain (even a custom one) that sets the target triple toavr-nonewill fail during toolchain resolution.