fix `build --stage 2 compiler/rustc` panic

Signed-off-by: ozkanonur <work@onurozkan.dev>

1 files changed, 7 insertions, 0 deletions

diff --git a/src/bootstrap/compile.rs b/src/bootstrap/compile.rs
index 07c0d2233ca..cf31d99d1b8 100644
--- a/src/bootstrap/compile.rs
+++ b/src/bootstrap/compile.rs
@@ -1295,6 +1295,13 @@ impl Step for Assemble {
         // when not performing a full bootstrap).
         builder.ensure(Rustc::new(build_compiler, target_compiler.host));
 
+        // FIXME: For now patch over problems noted in #90244 by early returning here, even though
+        // we've not properly assembled the target sysroot. A full fix is pending further investigation,
+        // for now full bootstrap usage is rare enough that this is OK.
+        if target_compiler.stage >= 3 && !builder.config.full_bootstrap {
+            return target_compiler;
+        }
+
         for &backend in builder.config.rust_codegen_backends.iter() {
             if backend == "llvm" {
                 continue; // Already built as part of rustc