tvl-depot/tvix/eval/build.rs

use std::env;

fn main() {
    println!(
        "cargo:rustc-env=TVIX_CURRENT_SYSTEM={}",
        &env::var("TARGET").unwrap()
    );
    println!("cargo:rerun-if-changed-env=TARGET")
}
feat(tvix/eval): implement builtins.currentSystem This commit implements builtins.currentSystem, by capturing the cargo environment variable `TARGET` and exposing it to rustc as `TVIX_CURRENT_SYSTEM` so it can be inserted into the source code using `env!()`. The resulting value needs to be massaged a bit, since it is an "LLVM triple". The current code should work for all the platforms for which cppnix works (thanks qyliss for generating the list!). It does not reject all of the triples that cppnix's configure.ac rejects -- it is much more forgiving. We can tighten this up in a future commit. Signed-off-by: Adam Joseph <adam@westernsemico.com> Change-Id: I947f504b2af5a7fee8cf0cb301421d2fc9174ce1 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6986 Tested-by: BuildkiteCI Reviewed-by: tazjin <tazjin@tvl.su> 2022-10-12 11:26:40 +02:00			`use std::env;`

			`fn main() {`
			`println!(`
			`"cargo:rustc-env=TVIX_CURRENT_SYSTEM={}",`
			`&env::var("TARGET").unwrap()`
			`);`
			`println!("cargo:rerun-if-changed-env=TARGET")`
			`}`