Red Bear OS
63 lines
2.1 KiB
Rust
63 lines
2.1 KiB
Rust
extern crate cc;
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use std::{env, fs};
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fn main() {
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let _crate_dir = env::var("CARGO_MANIFEST_DIR").expect("CARGO_MANIFEST_DIR not set");
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let target = env::var("TARGET").unwrap();
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println!("cargo:rerun-if-changed=src/c");
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// The Redoxer toolchain and some upstream nightlies keep the older
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// `VaList<'a>` ABI for `extern "C" fn(...)` parameters, while others
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// pass `VaListImpl<'f>` and require `.as_va_list()` to obtain
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// `VaList<'_, '_>`. This is a host-compiler property, so probe
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// directly with the host rustc (avoiding autocfg's target probing).
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println!("cargo:rustc-check-cfg=cfg(relibc_valist_impl)");
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let rustc = env::var("RUSTC").unwrap_or_else(|_| "rustc".to_string());
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let out_dir = env::var("OUT_DIR").unwrap_or_else(|_| "/tmp".to_string());
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let probe_file = std::path::Path::new(&out_dir).join("relibc_valist_probe.rs");
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let probe_out = std::path::Path::new(&out_dir).join("librelibc_valist_probe.rlib");
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std::fs::write(
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&probe_file,
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"#![feature(c_variadic)] pub fn _relibc_valist_probe(_: core::ffi::VaList<'_, '_>) {}",
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)
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.ok();
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let probe_ok = std::process::Command::new(&rustc)
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.args([
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"--crate-type",
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"lib",
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"--edition",
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"2024",
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probe_file.to_str().unwrap(),
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"-o",
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probe_out.to_str().unwrap(),
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])
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.status()
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.ok()
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.map_or(false, |s| s.success());
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if probe_ok {
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println!("cargo:rustc-cfg=relibc_valist_impl");
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}
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let mut cc_builder = &mut cc::Build::new();
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cc_builder = cc_builder.flag("-nostdinc").flag("-nostdlib");
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if target.starts_with("aarch64") {
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cc_builder = cc_builder.flag("-mno-outline-atomics")
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}
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cc_builder
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.flag("-fno-stack-protector")
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.flag("-Wno-expansion-to-defined")
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.files(
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fs::read_dir("src/c")
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.expect("src/c directory missing")
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.map(|res| res.expect("read_dir error").path()),
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)
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.compile("relibc_c");
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println!("cargo:rustc-link-lib=static=relibc_c");
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}
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