examples: Split hello example into hello and hello_wasm

Decouple the hello example into hello and hello_wasm. The hello_wasm
example is a minimal example to show how to build a wasm application
by using the NuttX build system, and avoid disturbing the hello
(native build).

Signed-off-by: Huang Qi <huangqi3@xiaomi.com>

examples/hello/Makefile

@@ -31,12 +31,4 @@ MODULE    = $(CONFIG_EXAMPLES_HELLO)
 
 MAINSRC = hello_main.c
 
-# Build with WebAssembly when CONFIG_INTERPRETERS_WAMR is enabled
-
-WASM_BUILD = both
-
-# Mode of WebAssembly Micro Runtime
-
-WAMR_MODE  = AOT
-
 include $(APPDIR)/Application.mk

examples/hello_wasm/Kconfig

@@ -0,0 +1,29 @@
+#
+# For a description of the syntax of this configuration file,
+# see the file kconfig-language.txt in the NuttX tools repository.
+#
+
+config EXAMPLES_HELLO_WASM
+	tristate "\"Hello, WebAssembly!\" example"
+	default n
+	---help---
+		Enable the \"Hello, WebAssembly!\" example
+
+if EXAMPLES_HELLO_WASM
+
+config EXAMPLES_HELLO_WASM_PROGNAME
+	string "Program name"
+	default "hello_wasm"
+	---help---
+		This is the name of the program that will be used when the NSH ELF
+		program is installed.
+
+config EXAMPLES_HELLO_WASM__PRIORITY
+	int "Hello wasm task priority"
+	default 100
+
+config EXAMPLES_HELLO_WASM_STACKSIZE
+	int "Hello wasm stack size"
+	default DEFAULT_TASK_STACKSIZE
+
+endif

examples/hello_wasm/Make.defs

@@ -0,0 +1,23 @@
+############################################################################
+# apps/examples/hello_wasm/Make.defs
+#
+# 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.
+#
+############################################################################
+
+ifneq ($(CONFIG_EXAMPLES_HELLO_WASM),)
+CONFIGURED_APPS += $(APPDIR)/examples/hello_wasm
+endif

examples/hello_wasm/Makefile

@@ -0,0 +1,42 @@
+############################################################################
+# apps/examples/hello_wasm/Makefile
+#
+# 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.
+#
+############################################################################
+
+include $(APPDIR)/Make.defs
+
+# Hello, World! built-in application info
+
+PROGNAME  = $(CONFIG_EXAMPLES_HELLO_WASM_PROGNAME)
+PRIORITY  = $(CONFIG_EXAMPLES_HELLO_WASM_PRIORITY)
+STACKSIZE = $(CONFIG_EXAMPLES_HELLO_WASM_STACKSIZE)
+MODULE    = $(CONFIG_EXAMPLES_HELLO_WASM)
+
+# Hello, World! Example
+
+MAINSRC = hello_main.c
+
+# Build with WebAssembly when CONFIG_INTERPRETERS_WAMR is enabled
+
+WASM_BUILD = y
+
+# Mode of WebAssembly Micro Runtime
+
+WAMR_MODE  = AOT
+
+include $(APPDIR)/Application.mk

examples/hello_wasm/hello_main.c

@@ -0,0 +1,40 @@
+/****************************************************************************
+ * apps/examples/hello_wasm/hello_main.c
+ *
+ * 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 <nuttx/config.h>
+#include <stdio.h>
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * hello_main
+ ****************************************************************************/
+
+int main(int argc, FAR char *argv[])
+{
+  printf("Hello, WebAssembly!!\n");
+  return 0;
+}