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Rust meets Mobile Keith Smiley (he/him) Principal Engineer, Lyft @SmileyKeith

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Sharing code on mobile

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Why rust?

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Rust + bazel

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rust_library( name = "foo", srcs = ["foo.rs"], ) swift_library( name = "main", srcs = ["main.swift"], deps = [":foo"], ) ios_application(...) Shouldn't this work?

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--platforms=//:ios_arm64

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bazel#7260

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platform_mappings

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flags: --cpu=arm64-v8a --crosstool_top=//external:android/crosstool //:android_aarch64 --cpu=ios_arm64 --apple_platform_type=ios //:ios_arm64 ...

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Undefined symbols for architecture arm64: "___rust_alloc", referenced from: ... "___rust_alloc_error_handler", referenced from: ... ... rules_rust#1238 / rust#73632

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Who does the linking?

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How do I use it?

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#[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);

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#[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(); }

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dtolnay/cxx rust-lang/rust-bindgen

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Future areas of improvement

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Developer Experience

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Future rust mobile support

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Was it worth it?

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keith/bazel-rust-mobile-demo

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- 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

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Thank you! twitter.com/SmileyKeith