Build
ESP32
For ESP32 with the espup toolchain installed:
cargo +esp build --target xtensa-esp32s3-none-elf -Zbuild-std=core,alloc
ARM Cortex M4
Install the dependencies, for example on Arch:
sudo pacman -S arm-none-eabi-newlib arm-none-eabi-gcc
Then check with:
arm-none-eabi-gcc -print-sysroot
Now you can build:
cargo build --target thumbv7em-none-eabihf