the musl script gets worse the longer i look https://github.com/rust-lang/compiler-builtins/blob/82a32c6bd1b82b55de5aea0cddb707732b54855f/crates/musl-math-sys/build.rs#L82-L92

 let target_features = env::var("CARGO_CFG_TARGET_FEATURE")
 .map(|feats| feats.split(',').map(ToOwned::to_owned).collect())
 .unwrap_or_default();
 let musl_dir = manifest_dir.join("musl");


 let target_arch = env::var("CARGO_CFG_TARGET_ARCH").unwrap();
 let musl_arch = if target_arch == "x86" {
 "i386".to_owned()
 } else {
 target_arch.clone()
 };

this is a standard env var set from the standard configuration and it's splitting by string? matching against hardcoded literal strings? i could add a zero-width space and break the build. i could ruin everyone's week