[mlir][ExecutionEngine] propagate errors in mlirExecutionEngineCreate

Author: makslevental

mlir/lib/CAPI/ExecutionEngine/ExecutionEngine.cpp

@@ -38,13 +38,15 @@ mlirExecutionEngineCreate(MlirModule op, int optLevel, int numPaths,
 
   auto tmBuilderOrError = llvm::orc::JITTargetMachineBuilder::detectHost();
   if (!tmBuilderOrError) {
-    llvm::errs() << "Failed to create a JITTargetMachineBuilder for the host\n";
+    llvm::errs()
+        << "Failed to create a JITTargetMachineBuilder for the host because: "
+        << tmBuilderOrError.takeError() << "\n";
     return MlirExecutionEngine{nullptr};
   }
   auto tmOrError = tmBuilderOrError->createTargetMachine();
   if (!tmOrError) {
     llvm::errs() << "Failed to create a TargetMachine for the host because: "
-                 << tmOrError.takeError();
+                 << tmOrError.takeError() << "\n";
     return MlirExecutionEngine{nullptr};
   }