79 lines
2.5 KiB
Rust
79 lines
2.5 KiB
Rust
extern crate rustc_version;
|
|
|
|
use std::env;
|
|
use std::fs::File;
|
|
use std::io::Write;
|
|
use std::path::PathBuf;
|
|
use std::ops::{Neg,Sub};
|
|
|
|
/*
|
|
* Let me explain this hack. For the sync shell script it's easiest if every
|
|
* line in mapping.rs looks exactly the same. This means that specifying an
|
|
* array literal is not possible. include!() can only expand to expressions, so
|
|
* just specifying the contents of an array is also not possible.
|
|
*
|
|
* This leaves us with trying to find an expression in which every line looks
|
|
* the same. This can be done using the `-` operator. This can be a unary
|
|
* operator (first thing on the first line), or a binary operator (later
|
|
* lines). That is exactly what's going on here, and Neg and Sub simply build a
|
|
* vector of the operangs.
|
|
*/
|
|
struct Mapping(&'static str,&'static str);
|
|
|
|
impl Neg for Mapping {
|
|
type Output = Vec<Mapping>;
|
|
fn neg(self) -> Vec<Mapping> {
|
|
vec![self.into()]
|
|
}
|
|
}
|
|
|
|
impl Sub<Mapping> for Vec<Mapping> {
|
|
type Output=Vec<Mapping>;
|
|
fn sub(mut self, rhs: Mapping) -> Vec<Mapping> {
|
|
self.push(rhs.into());
|
|
self
|
|
}
|
|
}
|
|
|
|
fn main() {
|
|
let ver=rustc_version::version_meta();
|
|
|
|
let io_commit=match env::var("CORE_IO_COMMIT") {
|
|
Ok(c) => c,
|
|
Err(env::VarError::NotUnicode(_)) => panic!("Invalid commit specified in CORE_IO_COMMIT"),
|
|
Err(env::VarError::NotPresent) => {
|
|
let mappings=include!("mapping.rs");
|
|
|
|
let compiler=ver.commit_hash.expect("Couldn't determine compiler version");
|
|
mappings.iter().find(|&&Mapping(elem,_)|elem==compiler).expect("Unknown compiler version, upgrade core_io?").1.to_owned()
|
|
}
|
|
};
|
|
|
|
if ver.commit_date.as_ref().map_or(false,|d| &**d>="2018-01-01") {
|
|
println!("cargo:rustc-cfg=core_memchr");
|
|
}
|
|
|
|
if ver.commit_date.as_ref().map_or(false,|d| &**d>="2017-06-15") {
|
|
println!("cargo:rustc-cfg=no_collections");
|
|
}
|
|
|
|
if ver.commit_date.as_ref().map_or(false,|d| &**d<"2016-12-15") {
|
|
println!("cargo:rustc-cfg=rustc_unicode");
|
|
} else if ver.commit_date.as_ref().map_or(false,|d| &**d<"2017-03-03") {
|
|
println!("cargo:rustc-cfg=std_unicode");
|
|
}
|
|
|
|
let mut dest_path=PathBuf::from(env::var_os("OUT_DIR").unwrap());
|
|
dest_path.push("io.rs");
|
|
let mut f=File::create(&dest_path).unwrap();
|
|
|
|
let mut target_path=PathBuf::from(env::var_os("CARGO_MANIFEST_DIR").unwrap());
|
|
target_path.push("src");
|
|
target_path.push(io_commit);
|
|
target_path.push("mod.rs");
|
|
|
|
f.write_all(br#"#[path=""#).unwrap();
|
|
f.write_all(target_path.into_os_string().into_string().unwrap().replace("\\", "\\\\").as_bytes()).unwrap();
|
|
f.write_all(br#""] mod io;"#).unwrap();
|
|
}
|