[scons] code cleanup for scons script. (#10429)

* [scons] move project_generation to targets; code clean for building.py.

5 files changed, 124 insertions, 0 deletions

diff --git a/tools/hello/README.md b/tools/hello/README.md
new file mode 100644
index 0000000000..c7a8a0d004
--- /dev/null
+++ b/tools/hello/README.md
@@ -0,0 +1,49 @@
+# Hello Component
+
+这是一个使用package.json配置的RT-Thread组件示例，展示了如何使用package.json来替代传统的SConscript中DefineGroup的方式。
+
+## 文件结构
+
+```
+hello/
+├── hello.h          # 头文件
+├── hello.c          # 源文件
+├── package.json     # 组件配置文件
+├── SConscript       # 构建脚本
+└── README.md        # 说明文档
+```
+
+## package.json配置说明
+
+package.json文件包含了组件的所有构建信息：
+
+- `name`: 组件名称
+- `version`: 版本号
+- `description`: 组件描述
+- `author`: 作者信息
+- `license`: 许可证
+- `source_files`: 源文件列表
+- `CPPPATH`: 头文件搜索路径
+- `CPPDEFINES`: 预定义宏
+- `depends`: 依赖的组件
+
+## 使用方法
+
+1. 将hello文件夹复制到你的RT-Thread项目的components目录下
+2. 在应用代码中包含头文件：
+   ```c
+   #include "hello.h"
+   ```
+3. 调用hello_world函数：
+   ```c
+   hello_world();  // 输出: Hello World!
+   ```
+
+## 构建过程
+
+SConscript文件会：
+1. 导入package.py模块
+2. 调用BuildPackage函数处理package.json
+3. 自动创建DefineGroup并返回构建对象
+
+这种方式比传统的SConscript更加简洁和易于维护。 
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diff --git a/tools/hello/SConscript b/tools/hello/SConscript
new file mode 100644
index 0000000000..d75ecc66d7
--- /dev/null
+++ b/tools/hello/SConscript
@@ -0,0 +1,4 @@
+from package import *
+
+objs = BuildPackage()
+Return('objs')
diff --git a/tools/hello/hello.c b/tools/hello/hello.c
new file mode 100644
index 0000000000..f8c6fcc9c6
--- /dev/null
+++ b/tools/hello/hello.c
@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2025 RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2025-06-21     Bernard      First version
+ */
+
+#include <rtthread.h>
+#include "hello.h"
+
+/**
+ * @brief Hello world function implementation
+ *
+ * This function prints "Hello World!" to the console using rt_kprintf
+ */
+void hello_world(void)
+{
+    rt_kprintf("Hello World!\n");
+}
diff --git a/tools/hello/hello.h b/tools/hello/hello.h
new file mode 100644
index 0000000000..b1f81388c9
--- /dev/null
+++ b/tools/hello/hello.h
@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2025 RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2025-06-21     Bernard      First version
+ */
+
+#ifndef __HELLO_H__
+#define __HELLO_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief Hello world function
+ *
+ * This function prints "Hello World!" to the console
+ */
+void hello_world(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __HELLO_H__ */
diff --git a/tools/hello/package.json b/tools/hello/package.json
new file mode 100644
index 0000000000..1e390882b1
--- /dev/null
+++ b/tools/hello/package.json
@@ -0,0 +1,20 @@
+{
+    "name": "hello",
+    "version": "1.0.0",
+    "description": "Hello World component for RT-Thread",
+    "author": "RT-Thread Development Team",
+    "license": "Apache-2.0",
+    "type": "rt-package",
+    "source_files": [
+        "hello.c"
+    ],
+    "CPPPATH": [
+        "."
+    ],
+    "CPPDEFINES": [
+        "HELLO"
+    ],
+    "depends": [
+        ""
+    ]
+}
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