* crtstuff.c (__dso_handle): Declare.

	(__cxa_finalize): Likewise.
	(do_global_dtors_aux): Call __cxa_finalize if __dso_handle is
	non-NULL.

	* invoke.texi: Document -fuse-cxa-atexit.

	* tree.h (ptr_type_node): Document.
	(const_ptr_type_node): Likewise.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@30989 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 16 insertions, 0 deletions

diff --git a/gcc/crtstuff.c b/gcc/crtstuff.c
index a17433a0c43..53dae7cddc2 100644
--- a/gcc/crtstuff.c
+++ b/gcc/crtstuff.c
@@ -129,6 +129,19 @@ typedef void (*func_ptr) (void);
 
 #ifdef OBJECT_FORMAT_ELF
 
+/* Declare the __dso_handle variable.  It should have a unique value
+   in every shared-object; in a main program its value is zero.  */
+
+#ifdef CRTSTUFFS_O
+void *__dso_handle = &__dso_handle;
+#else
+void *__dso_handle = 0;
+#endif
+
+/* The __cxa_finalize function may not be available so we use only a
+   weak declaration.  */
+extern void __cxa_finalize (void *) TARGET_ATTRIBUTE_WEAK;
+
 /* Run all the global destructors on exit from the program.  */
  
 /* Some systems place the number of pointers in the first word of the
@@ -159,6 +172,9 @@ __do_global_dtors_aux (void)
   if (completed)
     return;
 
+  if (__dso_handle && __cxa_finalize)
+    __cxa_finalize (__dso_handle);
+
   while (*p)
     {
       p++;