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i128: enable support for 128-bit integers automatically
This adds a build.rs to byteorder that will set a conditional compilation flag automatically if the current Rust compiler supports 128-bit integers. This makes the i128 feature itself a no-op. We continue to allow the feature to be supplied for backwards compatibility. Addresses bincode-org/bincode#250
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,82 @@ | ||
| use std::env; | ||
| use std::ffi::OsString; | ||
| use std::process::Command; | ||
|
|
||
| fn main() { | ||
| let version = match Version::read() { | ||
| Ok(version) => version, | ||
| Err(err) => { | ||
| eprintln!("failed to parse `rustc --version`: {}", err); | ||
| return; | ||
| } | ||
| }; | ||
| enable_i128(version); | ||
| } | ||
|
|
||
| fn enable_i128(version: Version) { | ||
| if version < (Version { major: 1, minor: 26, patch: 0 }) { | ||
| return; | ||
| } | ||
|
|
||
| println!("cargo:rustc-cfg=byteorder_i128"); | ||
| } | ||
|
|
||
| #[derive(Clone, Copy, Debug, Eq, PartialEq, PartialOrd, Ord)] | ||
| struct Version { | ||
| major: u32, | ||
| minor: u32, | ||
| patch: u32, | ||
| } | ||
|
|
||
| impl Version { | ||
| fn read() -> Result<Version, String> { | ||
| let rustc = env::var_os("RUSTC").unwrap_or(OsString::from("rustc")); | ||
| let output = Command::new(&rustc) | ||
| .arg("--version") | ||
| .output() | ||
| .unwrap() | ||
| .stdout; | ||
| Version::parse(&String::from_utf8(output).unwrap()) | ||
| } | ||
|
|
||
| fn parse(mut s: &str) -> Result<Version, String> { | ||
| if !s.starts_with("rustc ") { | ||
| return Err(format!("unrecognized version string: {}", s)); | ||
| } | ||
| s = &s["rustc ".len()..]; | ||
|
|
||
| let parts: Vec<&str> = s.split(".").collect(); | ||
| if parts.len() < 3 { | ||
| return Err(format!("not enough version parts: {:?}", parts)); | ||
| } | ||
|
|
||
| let mut num = String::new(); | ||
| for c in parts[0].chars() { | ||
| if !c.is_digit(10) { | ||
| break; | ||
| } | ||
| num.push(c); | ||
| } | ||
| let major = num.parse::<u32>().map_err(|e| e.to_string())?; | ||
|
|
||
| num.clear(); | ||
| for c in parts[1].chars() { | ||
| if !c.is_digit(10) { | ||
| break; | ||
| } | ||
| num.push(c); | ||
| } | ||
| let minor = num.parse::<u32>().map_err(|e| e.to_string())?; | ||
|
|
||
| num.clear(); | ||
| for c in parts[2].chars() { | ||
| if !c.is_digit(10) { | ||
| break; | ||
| } | ||
| num.push(c); | ||
| } | ||
| let patch = num.parse::<u32>().map_err(|e| e.to_string())?; | ||
|
|
||
| Ok(Version { major, minor, patch }) | ||
| } | ||
| } |
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