embedded-trainings-2020/embedded-workshop-book/src/building-program.md

Building an Embedded Program

The following command cross compiles the program to the ARM Cortex-M4 architecture.

$ cargo build --bin hello

The default in a Cargo project is to compile for the host (native compilation) but the beginner/apps project has been configured for cross compilation. This configuration can be seen in the Cargo configuration file (.cargo/config):

# .cargo/config
[build]
target = "thumbv7em-none-eabi" # = ARM Cortex-M4

The output of the compilation process will be an ELF (Executable and Linkable Format) file. The file will be placed in the target/thumbv7em-none-eabi directory.

$ file target/thumbv7em-none-eabi/debug/hello
hello: ELF 32-bit LSB executable, ARM, EABI5 version 1 (SYSV), statically linked, with debug_info, not stripped