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use std::{env, process::Command};
fn main() {
if let Some(minor_version) = minor_rustc_version() {
// rustc 1.80 stabilized ARM CRC32 intrinsics:
// https://doc.rust-lang.org/nightly/core/arch/aarch64/fn.__crc32d.html
if minor_version >= 80 {
println!("cargo:rustc-cfg=stable_arm_crc32_intrinsics");
println!("cargo:rustc-check-cfg=cfg(stable_arm_crc32_intrinsics)");
}
}
}
fn minor_rustc_version() -> Option<u32> {
Command::new(env::var_os("RUSTC")?)
.arg("--version")
.output()
.ok()
.and_then(|output| {
std::str::from_utf8(&output.stdout).ok().and_then(|output| {
output
.split('.')
.nth(1)
.and_then(|minor_version| minor_version.parse().ok())
})
})
}
|
