This is a very early attempt at creating crates that make it easier to mix Rust applications with C and C++ libraries for the Arduino Uno.
src/lib.rs is laughably incomplete. I have not even figured out what
I want to live in there.
The rust-arduino-runtime/ crate wraps the core.a library that the
Arduino IDE builds using the files in /usr/share/arduino/hardware/arduino/avr/cores/arduino/ The most useful
thing from there is arduino_main_init() which wraps the init()
function from wiring.c. The first C++ library I attempted to
cross-compile failed to work until I called init().
The arduino-build-helpers/ crate provides a trait ArduinoBuilder
which adds a .rig_arduino() method to cc:Builder that adds a
bunch of -I and -D stuff that is needed to cross-compile Arduino
libraries.
undefined reference to _ZN4core9panicking5panic17h4e6dc9a216f914a6E
undefined references to core::panicking::panic