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Rust meets Mobile
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Keith Smiley
November 07, 2022
Programming
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Rust meets Mobile
2022 BazelCon talk about using bazel to build rust libraries for iOS and Android
Keith Smiley
November 07, 2022
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Transcript
Rust meets Mobile Keith Smiley (he/him) Principal Engineer, Lyft @SmileyKeith
Sharing code on mobile
Why rust?
Rust + bazel
rust_library( name = "foo", srcs = ["foo.rs"], ) swift_library( name
= "main", srcs = ["main.swift"], deps = [":foo"], ) ios_application(...) Shouldn't this work?
--platforms=//:ios_arm64
bazel#7260
platform_mappings
flags: --cpu=arm64-v8a --crosstool_top=//external:android/crosstool //:android_aarch64 --cpu=ios_arm64 --apple_platform_type=ios //:ios_arm64 ...
Undefined symbols for architecture arm64: "___rust_alloc", referenced from: ... "___rust_alloc_error_handler",
referenced from: ... ... rules_rust#1238 / rust#73632
Who does the linking?
How do I use it?
#[no_mangle] pub extern fn print_something_from_rust() { println!("Ferris says hello!"); }
#[no_mangle] pub extern fn get_a_value_from_rust() -> i32 { 42 } extern void print_something_from_rust(void); extern int32_t get_a_value_from_rust(void);
#[no_mangle] pub extern "system" fn Java_com_example_androidapp_JniShim_getValue() -> i32 { get_a_value_from_rust()
} package com.example.androidapp; public class JniShim { public static native int getValue(); }
dtolnay/cxx rust-lang/rust-bindgen
Future areas of improvement
Developer Experience
Future rust mobile support
Was it worth it?
keith/bazel-rust-mobile-demo
- bazel#11454 - bazel#15041 - bazel#15248 - bazel#15462 - bazel#7260
- cargo-raze#484 - cargo-raze#489 - rules_rust#1186 - rules_rust#1238 - rules_rust#1259 - rules_rust#1271 - rules_rust#1276 - rules_rust#1290 - rules_rust#1304 - rules_rust#1362 - rules_rust#1372 - rules_rust#1401 - rules_rust#1462 - rules_rust#1541 - rules_rust#1545 - rules_rust#1546 - rules_rust#1573 - rules_rust#1576 - rust#73632
Thank you! twitter.com/SmileyKeith