1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
|
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"),
_ => {}
}
}
}
|
