3849 implement __cxa_atexit/__cxa_finalize

@@ -88,10 +88,16 @@
 $endif
 $if _x86 && _ELF64
 $add amd64
 $endif
 
+SYMBOL_VERSION ILLUMOS_0.5 {    # common C++ ABI exit handlers
+    protected:
+        __cxa_atexit;
+        __cxa_finalize;
+} ILLUMOS_0.4;
+
 SYMBOL_VERSION ILLUMOS_0.4 {    # Illumos additions
     protected:
         pipe2;
         dup3;
         mkostemp;