diff --git a/flang/lib/Optimizer/CodeGen/Target.cpp b/flang/lib/Optimizer/CodeGen/Target.cpp
--- a/flang/lib/Optimizer/CodeGen/Target.cpp
+++ b/flang/lib/Optimizer/CodeGen/Target.cpp
@@ -291,5 +291,6 @@
     }
     break;
   }
-  llvm::report_fatal_error("target not implemented");
+  mlir::emitError(mlir::UnknownLoc::get(&context), "target is not supported");
+  signalPassFailure();
 }