Use cargo in y.sh

This will allow adding dependencies to the build system in the future.

.gitignore

@@ -1,8 +1,4 @@
 # Build artifacts during normal use
-/y.bin
-/y.bin.dSYM
-/y.exe
-/y.pdb
 /download
 /build
 /dist

build_system/Cargo.toml

@@ -11,3 +11,6 @@ path = "main.rs"
 unstable-features = [] # for rust-analyzer
 
 # Do not add any dependencies
+
+[profile.dev]
+debug = 1

build_system/main.rs

@@ -147,9 +147,11 @@ fn main() {
 
     let rustup_toolchain_name = match (env::var("CARGO"), env::var("RUSTC"), env::var("RUSTDOC")) {
         (Ok(_), Ok(_), Ok(_)) => None,
-        (Err(_), Err(_), Err(_)) => Some(rustc_info::get_toolchain_name()),
-        _ => {
-            eprintln!("All of CARGO, RUSTC and RUSTDOC need to be set or none must be set");
+        (_, Err(_), Err(_)) => Some(rustc_info::get_toolchain_name()),
+        vars => {
+            eprintln!(
+                "If RUSTC or RUSTDOC is set, both need to be set and in addition CARGO needs to be set: {vars:?}"
+            );
             process::exit(1);
         }
     };

y.cmd

@@ -1,8 +1,6 @@
 @echo off
 echo [BUILD] build system >&2
-mkdir build 2>nul
-rustc build_system/main.rs -o build\y.exe -Cdebuginfo=1 --edition 2021 || goto :error
-build\y.exe %* || goto :error
+cargo run --manifest-path build_system/Cargo.toml -- %* || goto :error
 goto :EOF
 
 :error

y.ps1

@@ -1,12 +1,7 @@
 $ErrorActionPreference = "Stop"
 
 $host.ui.WriteErrorLine("[BUILD] build system")
-New-Item -ItemType Directory -Force -Path build | Out-Null
-& rustc build_system/main.rs -o build\y.exe -Cdebuginfo=1 --edition 2021
-if ($LASTEXITCODE -ne 0) {
-    exit $LASTEXITCODE
-}
-& build\y.exe $args
+& cargo run --manifest-path build_system/Cargo.toml -- $args
 if ($LASTEXITCODE -ne 0) {
     exit $LASTEXITCODE
 }

y.sh

@@ -2,5 +2,4 @@
 
 set -e
 echo "[BUILD] build system" 1>&2
-rustc build_system/main.rs -o y.bin -Cdebuginfo=1 --edition 2021
-exec ./y.bin "$@"
+exec cargo run --manifest-path build_system/Cargo.toml -- "$@"