Implement __cxa_atexit/__cxa_finalize as specified by the cross-vendor

ó++ ABI document at http://www.codesourcery.com/cxx-abi/abi.html#dso-dtor

The ABI was initially defined for ia64, but GCC3 and Intel compilers
have adopted it on other platforms.

This is the patch from PR bin/59552 with a number of changes by
me.

PR:		bin/59552
Submitted by:	Bradley T Hughes (bhughes at trolltech dot com)

2 files changed, 2 insertions, 13 deletions

diff --git a/lib/libc/stdlib/atexit.h b/lib/libc/stdlib/atexit.h
index 96ef95f..704c2e1 100644
--- a/lib/libc/stdlib/atexit.h
+++ b/lib/libc/stdlib/atexit.h
@@ -37,10 +37,4 @@
 /* must be at least 32 to guarantee ANSI conformance */
 #define	ATEXIT_SIZE	32
 
-struct atexit {
-	struct atexit *next;		/* next in list */
-	int ind;			/* next index in this table */
-	void (*fns[ATEXIT_SIZE])();	/* the table itself */
-};
-
-extern struct atexit *__atexit;	/* points to head of LIFO stack */
+void __cxa_finalize(void *dso);
diff --git a/lib/libc/stdlib/exit.c b/lib/libc/stdlib/exit.c
index 78c5f36..83abdbd 100644
--- a/lib/libc/stdlib/exit.c
+++ b/lib/libc/stdlib/exit.c
@@ -61,17 +61,12 @@ void
 exit(status)
 	int status;
 {
-	struct atexit *p;
-	int n;
-
 	/* Ensure that the auto-initialization routine is linked in: */
 	extern int _thread_autoinit_dummy_decl;
 
 	_thread_autoinit_dummy_decl = 1;
 
-	for (p = __atexit; p; p = p->next)
-		for (n = p->ind; --n >= 0;)
-			(*p->fns[n])();
+	__cxa_finalize(NULL);
 	if (__cleanup)
 		(*__cleanup)();
 	_exit(status);