Support more features for rt-thread (#3661)

1, enable thread mgr
2, enable libc wasi
3, enable libc wasi threads
4, specify a function name of the module to run rather main

core/shared/platform/common/libc-util/SConscript

@@ -0,0 +1,20 @@
+#
+# Copyright 2024 Sony Semiconductor Solutions Corporation.
+#
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+#
+
+from building import *
+import re
+
+Import('rtconfig')
+
+cwd     = GetCurrentDir()
+src     = Split('''
+libc_errno.c
+''')
+CPPPATH = [cwd]
+
+group = DefineGroup('iwasm_libc_util', src, depend = [''], CPPPATH = CPPPATH)
+
+Return('group')

core/shared/platform/common/posix/SConscript

@@ -0,0 +1,20 @@
+#
+# Copyright 2024 Sony Semiconductor Solutions Corporation.
+#
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+#
+
+from building import *
+import re
+
+Import('rtconfig')
+
+cwd     = GetCurrentDir()
+src     = Split('''
+posix_file.c
+''')
+CPPPATH = [cwd]
+
+group = DefineGroup('iwasm_common_posix', src, depend = [''], CPPPATH = CPPPATH)
+
+Return('group')

core/shared/platform/common/posix/posix_file.c

@@ -26,7 +26,7 @@
  * (platform_internal.h)
  */
 #if !defined(CONFIG_HAS_D_INO)
-#if !defined(__NuttX__)
+#if !defined(__NuttX__) && !defined(__RTTHREAD__)
 #define CONFIG_HAS_D_INO 1
 #define CONFIG_HAS_ISATTY 1
 #else

core/shared/platform/common/posix/posix_thread.c

@@ -4,8 +4,10 @@
  */
 
 #ifndef _GNU_SOURCE
+#if !defined(__RTTHREAD__)
 #define _GNU_SOURCE
 #endif
+#endif
 #include "platform_api_vmcore.h"
 #include "platform_api_extension.h"
 
@@ -448,7 +450,7 @@ os_thread_get_stack_boundary()
         addr += guard_size;
     }
     (void)stack_size;
-#elif defined(__APPLE__) || defined(__NuttX__)
+#elif defined(__APPLE__) || defined(__NuttX__) || defined(__RTTHREAD__)
     if ((addr = (uint8 *)pthread_get_stackaddr_np(self))) {
         stack_size = pthread_get_stacksize_np(self);