add version check (#5850)

include/rtdef.h

@@ -42,6 +42,7 @@
  * 2022-01-07     Gabriel      move some __on_rt_xxxxx_hook to dedicated c source files
  * 2022-01-12     Meco Man     remove RT_THREAD_BLOCK
  * 2022-04-20     Meco Man     change version number to v4.1.1
+ * 2022-04-21     THEWON       add macro RT_VERSION_CHECK
  * 2022-06-29     Meco Man     add RT_USING_LIBC and standard libc headers
  */
 
@@ -71,8 +72,11 @@ extern "C" {
 #define RT_REVISION                     1               /**< revise version number */
 
 /* RT-Thread version */
-#define RTTHREAD_VERSION                ((RT_VERSION * 10000) + \
-                                         (RT_SUBVERSION * 100) + RT_REVISION)
+#define RTTHREAD_VERSION                RT_VERSION_CHECK(RT_VERSION, RT_SUBVERSION, RT_REVISION)
+
+/* e.g. #if (RTTHREAD_VERSION >= RT_VERSION_CHECK(4, 1, 0) */
+#define RT_VERSION_CHECK(major, minor, revise)          ((major * 10000) + \
+                                                         (minor * 100) + revise)
 
 /* RT-Thread basic data type definitions */
 #ifndef RT_USING_ARCH_DATA_TYPE