57 lines
2.1 KiB
Rust
57 lines
2.1 KiB
Rust
use std::{env, ffi::OsString, process::Command};
|
|
|
|
/// Tries to get the minor version of the Rust compiler in use.
|
|
/// If it fails for any reason, returns `None`.
|
|
///
|
|
/// Based on the `rustc_version` crate.
|
|
fn rustc_minor_version() -> Option<u64> {
|
|
let rustc = env::var_os("RUSTC").unwrap_or_else(|| OsString::from("rustc"));
|
|
let mut cmd = if let Some(wrapper) = env::var_os("RUSTC_WRAPPER").filter(|w| !w.is_empty()) {
|
|
let mut cmd = Command::new(wrapper);
|
|
cmd.arg(rustc);
|
|
cmd
|
|
} else {
|
|
Command::new(rustc)
|
|
};
|
|
|
|
let out = cmd.arg("-vV").output().ok()?;
|
|
|
|
if !out.status.success() {
|
|
return None;
|
|
}
|
|
|
|
let stdout = std::str::from_utf8(&out.stdout).ok()?;
|
|
|
|
// Assumes that the first line contains "rustc 1.xx.0-channel (abcdef 2025-01-01)"
|
|
// where "xx" is the minor version which we want to extract
|
|
let mut lines = stdout.lines();
|
|
let first_line = lines.next()?;
|
|
let minor_ver_str = first_line.split(".").nth(1)?;
|
|
minor_ver_str.parse().ok()
|
|
}
|
|
|
|
fn main() {
|
|
// Automatically detect cfg(sanitize = "memory") even if cfg(sanitize) isn't
|
|
// supported. Build scripts get cfg() info, even if the cfg is unstable.
|
|
println!("cargo:rerun-if-changed=build.rs");
|
|
let santizers = std::env::var("CARGO_CFG_SANITIZE").unwrap_or_default();
|
|
if santizers.contains("memory") {
|
|
println!("cargo:rustc-cfg=getrandom_msan");
|
|
}
|
|
|
|
// Use `RtlGenRandom` on older compiler versions since win7 targets
|
|
// TODO(MSRV 1.78): Remove this check
|
|
let target_family = env::var_os("CARGO_CFG_TARGET_FAMILY").and_then(|f| f.into_string().ok());
|
|
if target_family.as_deref() == Some("windows") {
|
|
/// Minor version of the Rust compiler in which win7 targets were inroduced
|
|
const WIN7_INTRODUCED_MINOR_VER: u64 = 78;
|
|
|
|
match rustc_minor_version() {
|
|
Some(minor_ver) if minor_ver < WIN7_INTRODUCED_MINOR_VER => {
|
|
println!("cargo:rustc-cfg=getrandom_windows_legacy");
|
|
}
|
|
None => println!("cargo:warning=Couldn't detect minor version of the Rust compiler"),
|
|
_ => {}
|
|
}
|
|
}
|
|
}
|