LTO when enabled on AARCH64 version miscompiles my project

[rew]

I've moved from my PC to a raspberry pi because the USB on my PC is bad and slowing me down.

Turns out that the compiler from gcc-arm-none-eabi-9-2020-q2-update-aarch64-linux.tar.bz2 does not produce a working binary while the ia64 version does. The raspberry pi DOES produce a working binary when I disable LTO.

Giovanni, the author of Chibios that I use suggested I try and compile my own compiler from source. That didn't work out for me. the compilation does not run smooth. (in build prerequisites, after having compiled a bunch and manually doing one step... it suddenly gets "configure: error: C compiler cannot create executables" Well, I'd say that's not true. Anyway, that's when I'm like at 2% of compiling the project. It's not working for me.)

[rew (r-e-wolff)]

P.S. I know it's too little to go on. I'll add info when/if I find out.