Rollup merge of rust-lang#122205 - onur-ozkan:incorrect-sysroot-for-t…

…arget, r=albertlarsan68

ensure that sysroot is properly set for cross-targets

Previously, doing `x test compiler/*` would result in build failures due to missing libraries. This ensures properly setting up the sysroot for cross targets.

src/bootstrap/src/core/build_steps/test.rs

@@ -2580,6 +2580,12 @@ impl Step for Crate {
         // we're working with automatically.
         let compiler = builder.compiler_for(compiler.stage, compiler.host, target);
 
+        // During cross compilations, sysroot for the target may not be available.
+        // Ensure that it is prepared.
+        if builder.config.build != target {
+            builder.ensure(compile::Rustc::new(compiler, target));
+        }
+
         let mut cargo = builder::Cargo::new(
             builder,
             compiler,