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//! build.rs file to obtain the host information.
// Allow dead code in triple.rs and targets.rs for our purposes here.
#![allow(dead_code)]
use std::env;
use std::fs::File;
use std::io::{self, Write};
use std::path::PathBuf;
use std::str::FromStr;
extern crate alloc;
// Include triple.rs and targets.rs so we can parse the TARGET environment variable.
mod triple {
include!("src/triple.rs");
}
mod targets {
include!("src/targets.rs");
}
// Stub out `ParseError` to minimally support triple.rs and targets.rs.
mod parse_error {
#[derive(Debug)]
pub enum ParseError {
UnrecognizedArchitecture(String),
UnrecognizedVendor(String),
UnrecognizedOperatingSystem(String),
UnrecognizedEnvironment(String),
UnrecognizedBinaryFormat(String),
UnrecognizedField(String),
}
}
use self::triple::Triple;
fn main() {
let out_dir =
PathBuf::from(env::var("OUT_DIR").expect("The OUT_DIR environment variable must be set"));
let target = env::var("TARGET").expect("The TARGET environment variable must be set");
let triple = Triple::from_str(&target).expect(&format!("Invalid target name: '{}'", target));
let out = File::create(out_dir.join("host.rs")).expect("error creating host.rs");
write_host_rs(out, triple).expect("error writing host.rs");
}
fn write_host_rs(mut out: File, triple: Triple) -> io::Result<()> {
// The generated Debug implementation for the inner architecture variants
// doesn't print the enum name qualifier, so import them here. There
// shouldn't be any conflicts because these enums all share a namespace
// in the triple string format.
writeln!(out, "#[allow(unused_imports)]")?;
writeln!(out, "use crate::Aarch64Architecture::*;")?;
writeln!(out, "#[allow(unused_imports)]")?;
writeln!(out, "use crate::ArmArchitecture::*;")?;
writeln!(out)?;
writeln!(out, "/// The `Triple` of the current host.")?;
writeln!(out, "pub const HOST: Triple = Triple {{")?;
writeln!(
out,
" architecture: Architecture::{:?},",
triple.architecture
)?;
writeln!(out, " vendor: Vendor::{:?},", triple.vendor)?;
writeln!(
out,
" operating_system: OperatingSystem::{:?},",
triple.operating_system
)?;
writeln!(
out,
" environment: Environment::{:?},",
triple.environment
)?;
writeln!(
out,
" binary_format: BinaryFormat::{:?},",
triple.binary_format
)?;
writeln!(out, "}};")?;
writeln!(out)?;
writeln!(out, "impl Architecture {{")?;
writeln!(out, " /// Return the architecture for the current host.")?;
writeln!(out, " pub const fn host() -> Self {{")?;
writeln!(out, " Architecture::{:?}", triple.architecture)?;
writeln!(out, " }}")?;
writeln!(out, "}}")?;
writeln!(out)?;
writeln!(out, "impl Vendor {{")?;
writeln!(out, " /// Return the vendor for the current host.")?;
writeln!(out, " pub const fn host() -> Self {{")?;
writeln!(out, " Vendor::{:?}", triple.vendor)?;
writeln!(out, " }}")?;
writeln!(out, "}}")?;
writeln!(out)?;
writeln!(out, "impl OperatingSystem {{")?;
writeln!(
out,
" /// Return the operating system for the current host."
)?;
writeln!(out, " pub const fn host() -> Self {{")?;
writeln!(
out,
" OperatingSystem::{:?}",
triple.operating_system
)?;
writeln!(out, " }}")?;
writeln!(out, "}}")?;
writeln!(out)?;
writeln!(out, "impl Environment {{")?;
writeln!(out, " /// Return the environment for the current host.")?;
writeln!(out, " pub const fn host() -> Self {{")?;
writeln!(out, " Environment::{:?}", triple.environment)?;
writeln!(out, " }}")?;
writeln!(out, "}}")?;
writeln!(out)?;
writeln!(out, "impl BinaryFormat {{")?;
writeln!(
out,
" /// Return the binary format for the current host."
)?;
writeln!(out, " pub const fn host() -> Self {{")?;
writeln!(out, " BinaryFormat::{:?}", triple.binary_format)?;
writeln!(out, " }}")?;
writeln!(out, "}}")?;
writeln!(out)?;
writeln!(out, "impl Triple {{")?;
writeln!(out, " /// Return the triple for the current host.")?;
writeln!(out, " pub const fn host() -> Self {{")?;
writeln!(out, " Self {{")?;
writeln!(
out,
" architecture: Architecture::{:?},",
triple.architecture
)?;
writeln!(out, " vendor: Vendor::{:?},", triple.vendor)?;
writeln!(
out,
" operating_system: OperatingSystem::{:?},",
triple.operating_system
)?;
writeln!(
out,
" environment: Environment::{:?},",
triple.environment
)?;
writeln!(
out,
" binary_format: BinaryFormat::{:?},",
triple.binary_format
)?;
writeln!(out, " }}")?;
writeln!(out, " }}")?;
writeln!(out, "}}")?;
Ok(())
}
|
