46 lines
1.3 KiB
Rust
46 lines
1.3 KiB
Rust
use std::env;
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use std::ffi::OsString;
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use std::process::{self, Command};
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use std::str;
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fn main() {
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println!("cargo:rerun-if-changed=build.rs");
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let rustc = rustc_minor_version().unwrap_or(u32::MAX);
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if rustc >= 80 {
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println!("cargo:rustc-check-cfg=cfg(exhaustive)");
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println!("cargo:rustc-check-cfg=cfg(opt_level, values(\"s\"))");
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println!("cargo:rustc-check-cfg=cfg(zmij_no_select_unpredictable)");
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}
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if rustc < 88 {
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// https://doc.rust-lang.org/std/hint/fn.select_unpredictable.html
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println!("cargo:rustc-cfg=zmij_no_select_unpredictable");
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}
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if let Some(opt_level) = env::var_os("OPT_LEVEL") {
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if opt_level == "s" || opt_level == "z" {
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println!("cargo:rustc-cfg=opt_level=\"s\"");
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}
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}
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}
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fn rustc_minor_version() -> Option<u32> {
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let rustc = cargo_env_var("RUSTC");
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let output = Command::new(rustc).arg("--version").output().ok()?;
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let version = str::from_utf8(&output.stdout).ok()?;
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let mut pieces = version.split('.');
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if pieces.next() != Some("rustc 1") {
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return None;
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}
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pieces.next()?.parse().ok()
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}
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fn cargo_env_var(key: &str) -> OsString {
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env::var_os(key).unwrap_or_else(|| {
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eprintln!("Environment variable ${key} is not set during execution of build script");
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process::exit(1);
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})
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}
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