yamt commented on code in PR #16666:
URL: https://github.com/apache/nuttx/pull/16666#discussion_r2182237446


##########
arch/sim/src/sim/posix/sim_errno.c:
##########
@@ -0,0 +1,336 @@
+/****************************************************************************
+ * arch/sim/src/sim/posix/sim_errno.c
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <errno.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/* Add holder to detect possible errno in host def.h
+ * Use ERRNO_HOLDER to make ifdef able to expand at pre-processor time
+ */
+
+#define ERRNO_HOLDER_ 0,

Review Comment:
   is this one necessary?



##########
arch/sim/src/sim/posix/sim_errno.c:
##########
@@ -0,0 +1,336 @@
+/****************************************************************************
+ * arch/sim/src/sim/posix/sim_errno.c
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <errno.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/* Add holder to detect possible errno in host def.h
+ * Use ERRNO_HOLDER to make ifdef able to expand at pre-processor time

Review Comment:
   what do you think about these concerns? 
https://github.com/yamt/garbage/blob/4478d1d09d556347062ea6c9b1d161a93775b55e/c/cpp1/a.c#L14-L22



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