Target modifiers (special marked options) are recorded in metainfo and compared to be equal in different crates

compiler/rustc_interface/src/passes.rs

@@ -269,6 +269,7 @@ fn configure_and_expand(
 
     resolver.resolve_crate(&krate);
 
+    CStore::from_tcx(tcx).report_incompatible_target_modifiers(tcx, &krate);
     krate
 }