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Auto merge of #892 - tmfink:feature-832-custom-rust-target, r=emilio
Re-add --rust-target option to replace --unstable-rust Re-apply commit. Addresses #832 Instead of specifying whether or not to use stable, specify the Rust release to support (one of several stable/beta releases or nightly). The `--unstable-rust` option is still accepted and implies nightly. The definitions of `RustTarget` and `RustFeatures` are created with macros. For each test that uses unions, there is a version that uses the latest stable and 1.0.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,185 @@ | ||
| //! Contains code for selecting features | ||
| #![deny(missing_docs)] | ||
| #![deny(warnings)] | ||
| #![deny(unused_extern_crates)] | ||
|
|
||
| use std::io; | ||
| use std::str::FromStr; | ||
|
|
||
| /// Define RustTarget struct definition, Default impl, and conversions | ||
| /// between RustTarget and String. | ||
| macro_rules! rust_target_def { | ||
| ( $( $( #[$attr:meta] )* => $release:ident => $value:expr; )* ) => { | ||
| /// Represents the version of the Rust language to target. | ||
| /// | ||
| /// To support a beta release, use the corresponding stable release. | ||
| /// | ||
| /// This enum will have more variants added as necessary. | ||
| #[derive(Debug, Copy, Clone, Eq, PartialEq, PartialOrd, Hash)] | ||
| #[allow(non_camel_case_types)] | ||
| pub enum RustTarget { | ||
| $( | ||
| $( | ||
| #[$attr] | ||
| )* | ||
| $release, | ||
| )* | ||
| } | ||
|
|
||
| impl Default for RustTarget { | ||
| /// Gives the latest stable Rust version | ||
| fn default() -> RustTarget { | ||
| LATEST_STABLE_RUST | ||
| } | ||
| } | ||
|
|
||
| impl FromStr for RustTarget { | ||
| type Err = io::Error; | ||
|
|
||
| /// Create a `RustTarget` from a string. | ||
| /// | ||
| /// * The stable/beta versions of Rust are of the form "1.0", | ||
| /// "1.19", etc. | ||
| /// * The nightly version should be specified with "nightly". | ||
| fn from_str(s: &str) -> Result<Self, Self::Err> { | ||
| match s.as_ref() { | ||
| $( | ||
| stringify!($value) => Ok(RustTarget::$release), | ||
| )* | ||
| _ => Err( | ||
| io::Error::new( | ||
| io::ErrorKind::InvalidInput, | ||
| concat!( | ||
| "Got an invalid rust target. Accepted values ", | ||
| "are of the form ", | ||
| "\"1.0\" or \"nightly\"."))), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| impl From<RustTarget> for String { | ||
| fn from(target: RustTarget) -> Self { | ||
| match target { | ||
| $( | ||
| RustTarget::$release => stringify!($value), | ||
| )* | ||
| }.into() | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| /// Defines an array slice with all RustTarget values | ||
| macro_rules! rust_target_values_def { | ||
| ( $( $( #[$attr:meta] )* => $release:ident => $value:expr; )* ) => { | ||
| /// Strings of allowed `RustTarget` values | ||
| pub static RUST_TARGET_STRINGS: &'static [&str] = &[ | ||
| $( | ||
| stringify!($value), | ||
| )* | ||
| ]; | ||
| } | ||
| } | ||
|
|
||
| /// Defines macro which takes a macro | ||
| macro_rules! rust_target_base { | ||
| ( $x_macro:ident ) => { | ||
| $x_macro!( | ||
| /// Rust stable 1.0 | ||
| => Stable_1_0 => 1.0; | ||
| /// Rust stable 1.19 | ||
| => Stable_1_19 => 1.19; | ||
| /// Nightly rust | ||
| => Nightly => nightly; | ||
| ); | ||
| } | ||
| } | ||
|
|
||
| rust_target_base!(rust_target_def); | ||
| rust_target_base!(rust_target_values_def); | ||
|
|
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| /// Latest stable release of Rust | ||
| pub const LATEST_STABLE_RUST: RustTarget = RustTarget::Stable_1_19; | ||
|
|
||
| /// Create RustFeatures struct definition, new(), and a getter for each field | ||
| macro_rules! rust_feature_def { | ||
| ( $( $( #[$attr:meta] )* => $feature:ident; )* ) => { | ||
| /// Features supported by a rust target | ||
| #[derive(Debug, Copy, Clone, Eq, PartialEq, Hash)] | ||
| pub struct RustFeatures { | ||
| $( | ||
| $feature: bool, | ||
| )* | ||
| } | ||
|
|
||
| impl RustFeatures { | ||
| /// Gives a RustFeatures struct with all features disabled | ||
| fn new() -> Self { | ||
| RustFeatures { | ||
| $( | ||
| $feature: false, | ||
| )* | ||
| } | ||
| } | ||
|
|
||
| $( | ||
| $( | ||
| #[$attr] | ||
| )* | ||
| pub fn $feature(&self) -> bool { | ||
| self.$feature | ||
| } | ||
| )* | ||
| } | ||
| } | ||
| } | ||
|
|
||
| rust_feature_def!( | ||
| /// Untagged unions ([RFC 1444](https://github.com/rust-lang/rfcs/blob/master/text/1444-union.md)) | ||
| => untagged_union; | ||
| /// Constant function ([RFC 911](https://github.com/rust-lang/rfcs/blob/master/text/0911-const-fn.md)) | ||
| => const_fn; | ||
| ); | ||
|
|
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| impl From<RustTarget> for RustFeatures { | ||
| fn from(rust_target: RustTarget) -> Self { | ||
| let mut features = RustFeatures::new(); | ||
|
|
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| if rust_target >= RustTarget::Stable_1_19 { | ||
| features.untagged_union = true; | ||
| } | ||
|
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| if rust_target >= RustTarget::Nightly { | ||
| features.const_fn = true; | ||
| } | ||
|
|
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| features | ||
| } | ||
| } | ||
|
|
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| impl Default for RustFeatures { | ||
| fn default() -> Self { | ||
| let default_rust_target: RustTarget = Default::default(); | ||
| Self::from(default_rust_target) | ||
| } | ||
| } | ||
|
|
||
| #[cfg(test)] | ||
| mod test { | ||
| #![allow(unused_imports)] | ||
| use super::*; | ||
|
|
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| fn test_target(target_str: &str, target: RustTarget) { | ||
| let target_string: String = target.into(); | ||
| assert_eq!(target_str, target_string); | ||
| assert_eq!(target, RustTarget::from_str(target_str).unwrap()); | ||
| } | ||
|
|
||
| #[test] | ||
| fn str_to_target() { | ||
| test_target("1.0", RustTarget::Stable_1_0); | ||
| test_target("1.19", RustTarget::Stable_1_19); | ||
| test_target("nightly", RustTarget::Nightly); | ||
| } | ||
| } |
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