Rust nightly and xargo should be installed first.
A copy of rust is necessary to build libcore -
% git clone https://github.com/rust-lang/rust
Check what git commit your rust is based on -
% rustc --version
rustc 1.19.0-dev (ac254fbe7 2017-05-15)
And set your rust repo to that commit -
% cd rust
% git checkout ac254fbe7
% cd ..
Xargo needs to know where the rust source is -
% export XARGO_RUST_SRC=$PWD/rust/src
RUST_TARGET_PATH needs to be set to work around a bug that prevents us from specifying the json target file directly. This points to the directory where hexagon-unknown-elf.json is stored, which is the top of this repo.
% export RUST_TARGET_PATH=$PWD
Make sure the hexagon tools are in the PATH.
% export PATH="$HEXAGON_SDK_ROOT/tools/HEXAGON_Tools/8.0.08/Tools/bin:$PATH"
Build
% xargo build --target hexagon-unknown-elf --release
Run
% hexagon-sim target/hexagon-unknown-elf/release/hexagon-hello-world