RUSTC must be set by Cargo for build script

dtolnay · dtolnay · commit ee414707be0d · 2023-12-30T16:45:08.000-08:00
diff --git a/build.rs b/build.rs
@@ -146,7 +146,7 @@ fn compile_probe(rustc_bootstrap: bool) -> bool {
 }
 
 fn rustc_minor_version() -> Option<u32> {
-    let rustc = env::var_os("RUSTC")?;
+    let rustc = cargo_env_var("RUSTC");
     let output = Command::new(rustc).arg("--version").output().ok()?;
     let version = str::from_utf8(&output.stdout).ok()?;
     let mut pieces = version.split('.');

Original file line number	Diff line number	Diff line change
`@@ -146,7 +146,7 @@ fn compile_probe(rustc_bootstrap: bool) -> bool {`
`146`	`146`	`}`
`147`	`147`
`148`	`148`	`fn rustc_minor_version() -> Option<u32> {`
`149`		`- let rustc = env::var_os("RUSTC")?;`
	`149`	`+ let rustc = cargo_env_var("RUSTC");`
`150`	`150`	`let output = Command::new(rustc).arg("--version").output().ok()?;`
`151`	`151`	`let version = str::from_utf8(&output.stdout).ok()?;`
`152`	`152`	`let mut pieces = version.split('.');`