Linker error when using a floating point operation about avr-hal

[Rahix]

Hm, I know that in the past, a lot of the floating point methods didn't exist in libcore so you couldn't call them in the first place. The solution back then was to use the libm crate instead which has replacement implementations. libm::fminf() in your case...

But as your program is failing at the linker stage instead of simply erroring on a missing f32::min() method, it seems something has changed here. Maybe another compiler-builtins topic? @Patryk27, do you have any idea?

[Patryk27]

I've just checked and the code compiles correctly on my machine - could you run avr-gcc --version and post the result? Maybe you're using an older avr-gcc which didn't yet have float intrinsics for AVR.

(for comparison, I'm on avr-gcc (Homebrew AVR GCC 9.4.0) 9.4.0)

[MichalOp]

It looks like this was the issue, thank you. I was using avr-gcc 5.4.0 - which is the default one installed via apt for Ubuntu, and I guess it is too old.

After I compiled gcc 13.2.0 from source for avr (I also compiled avr-libc 2.1.0 for good measure), the program compiled and ran without issues.