[C++] fix the ctors initialization issue

components/cplusplus/crt_init.c

@@ -0,0 +1,24 @@
+#include <rtthread.h>
+
+int cplusplus_system_init(void)
+{
+#if defined(__GNUC__) && !defined(__CC_ARM)
+    extern unsigned char __ctors_start__;
+    extern unsigned char __ctors_end__;
+    typedef void (*func)(void);
+
+    /* .ctors initalization */
+    func *ctors_func;
+
+    for (ctors_func = (func *)&__ctors_start__;
+         ctors_func < (func *)&__ctors_end__;
+         ctors_func ++)
+    {
+        (*ctors_func)();
+    }
+#endif
+
+    return 0;
+}
+INIT_COMPONENT_EXPORT(cplusplus_system_init);
+