pkarashchenko commented on code in PR #6197:
URL: https://github.com/apache/incubator-nuttx/pull/6197#discussion_r880527543


##########
libs/libc/stdlib/lib_exit.c:
##########
@@ -22,13 +22,38 @@
  * Included Files
  ****************************************************************************/
 
+#include <nuttx/config.h>
+
+#include <nuttx/atexit.h>
+#include <nuttx/compiler.h>
+
 #include <stdlib.h>
 #include <unistd.h>
 
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+extern FAR void *__dso_handle weak_data;
+FAR void *__dso_handle = &__dso_handle;

Review Comment:
   Ok. Just figured it out.
   We need to keep as it is now. So `extern FAR void *__dso_handle weak_data;` 
is a reference to a linker hidden symbol and `FAR void *__dso_handle = 
&__dso_handle;` creates a `__dso_handle` symbol if it is not provided by the 
linker.



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