https://github.com/rust-lang/rust/issues/118867 We have not observed any abnormal behavior even though we fulfil all the criteria to be affected (opt-level='z', thumbv7em-none-eabi target, Rust toolchain 1.74.0 being >= 1.73.0), but we apply the workaround just in case.
This increases the binary size of the make firmware (Multi) build by 11568 bytes at the time of adding this workaround. This can be removed again once the issue above is fixed and we have updated to a Rust toolchain that contains the fix.
This workaround is one of three suggested alternatives. The other two are:
Downgrade the Rust toolchain - dismissed as it is harder to do, as it involves re-building the Docker image
Switch from opt-level='z' to opt-level='s' - this increases the binary size by 74416 bytes for the Multi, which is much more than the workaround in this commit.
Apply workaround for a potential miscompilation bug: See
make firmware(Multi) build by 11568 bytes at the time of adding this workaround. This can be removed again once the issue above is fixed and we have updated to a Rust toolchain that contains the fix.This workaround is one of three suggested alternatives. The other two are: