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Tomorrow I stop coffee, I get to crab !

Hosted slides are available at : https://loganmzz.github.io/rust-presentation-introduction/

Introduction to Rust language and its ecosystem. Goal is to ease starting with Rust for people with knowledge of an high-level language as Java.

  • Language (3 foundations)
    • Productivity: functional-style, no manual memory management, strong and infered typing
    • Performance: native compilation through LLVM, ∅GC, low-level language
    • Safety : memory safety, no concurrent access
    • Features
      • struct / trait / generics
      • ownership / borrowing
      • memory guarantees : Box / Arc
      • macro
  • Ecosystem :
    • IDE, tests, debugger, RLS
    • Build et package manager (Cargo)
    • Librairies (Rayon, Rocket, Nom)

Rust installation

Follows instructions available at https://www.rustup.rs/.

Cross-compilation

In order to cross-compile, you need both a Rust toolchain for the target platform and a "linker" for this platform.

Following instructions help in order to setup a Debian-based environment to target ARMv7.

ARMv7

First, you need to install a 32-bits compiler as ARMv7 is a 32-bits architecture:

apt-get update && apt-get install libc6-dev-i386

Next, install cross-compiling tools

apt-get update && apt-get install gcc-arm-linux-gnueabihf

Then, install target to Rust toolchain

rustup target add armv7-unknown-linux-gnueabihf

Finally, specify linker Cargo should use

cat >>~/.cargo/config <<EOF
[target.armv7-unknown-linux-gnueabihf]
linker = "arm-linux-gnueabihf-gcc"
EOF

In order to generate ARMv7 binaries:

cargo build --target armv7-unknown-linux-gnueabihf

Optionally, you can omit --target flag by adding the following section to your ~/.cargo/config:

[build]
target = "armv7-unknown-linux-gnueabihf"

JavaScript (Asm.js with emscripten)

First, you need to install emscripten.

Note: don't forget to set your environment each time with: ${EMSDK_HOME}/emsdk activate latest && source ${EMSDK_HOME}/.emsdk_env.sh

Then, install target to Rust toolchain:

rustup target add asmjs-unknown-emscripten

Next, to build your project:

cargo build --target asmjs-unknown-emscripten

Finally, execute your code in an HTML page:

<html>
    <head></head>
    <body>
        <script type="text/javascript" src="target/asmjs-unknown-emscripten/debug/project_name.js"></script>
    </body>
</html>