Projects making floating-point operations fail building during linking after toolchain version bump #650
Description
After the the update of Rust toolchain to nightly-2025-03-03 (9e96d0e), projects that perform floating-point operations are failing, due to undefined references to GCC soft float library routines (eg: __divsf3, __gesf2 and __gtsf2) during the linking process.
For instance, this line:
// duration is a u32
let distance = duration_us as f32 / 58.0;Generates the following error:
src/main.rs:230: undefined reference to `__divsf3'
While these lines:
// dist is the same value as the `distance` above
tdd.write(dist as u8);src/main.rs:280: undefined reference to `__gesf2'
src/main.rs:280: undefined reference to `__gtsf2'
Those errors didn't happen when using the previous Rust nightly version, along with using the JSON spec files.