rust-target-feature-data

Different versions of Rust support different target features. Different Rust targets automatically enable different target features. Different versions of Rust automatically enable different target features for the same target. Enabling the same target feature implies enabling different target features in different versions of Rust.

This crate provides target feature data for all targets covering Rust versions:

• "1.83.0"
• "1.84.0" (1.84.1 is identical)
• "1.85.0" (1.85.1 is identical)
• "1.86.0"
• "1.87.0" (from 1.87.0-beta.5)

Rust 1.88.0 provides target feature data for the selected target via rustdoc's JSON output format, making this crate obsolete going forward.

Example

use rust_target_feature_data::find;

let features: Vec<_ > = find("1.83.0", "x86_64-unknown-linux-gnu") ?.collect();
let pclmulqdq = features.iter().find( | f| f.name == "pclmulqdq").unwrap();
assert_eq!(pclmulqdq.globally_enabled, false);
assert_eq!(pclmulqdq.implies_features, [].into());

let features: Vec<_ > = find("1.84.0", "x86_64-unknown-linux-gnu") ?.collect();
let pclmulqdq = features.iter().find( | f| f.name == "pclmulqdq").unwrap();
assert_eq!(pclmulqdq.implies_features, ["sse2"].into());

Development

This crate was optimized for compile time and compiled code size. It uses bespoke, artisan data structures (gross, unreadable binary blobs) handcrafted (generated) by the finest tradespeople (ugliest automation). Update data/, rust-target-feature-data-dev, and/or rust-target-feature-data-gen if you must. Then:

% cargo run -p rust-target-feature-data-gen
…
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.87s
     Running `target/debug/rust-target-feature-data-gen`
% cargo test
    Finished `test` profile [unoptimized + debuginfo] target(s) in 4.87s
     Running unittests src/lib.rs (target/debug/deps/rust_target_feature_data-751168831ae8de8d)

running 4 tests
test tests::compiler_not_found ... ok
test tests::target_not_found ... ok
test tests::smoke ... ok
test tests::compare_all ... ok

test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.36s

   Doc-tests rust_target_feature_data

running 2 tests
test src/lib.rs - (line 21) ... ok
test src/lib.rs - find (line 111) ... ok

test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
% git commit .

The generator tool runs offline, i.e. in development, and its output is committed to this repository. Both the -dev nor -gen crates are purely internal to this workspace.