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C++ PATCH for c++/56346 (thread_local3.C link error on targets without __dso_handle)

We can't pass the address of __dso_handle to __cxa_thread_atexit if the target doesn't provide that symbol in the crt files. Fixed by passing NULL if the target doesn't use __cxa_atexit.

Tested x86_64-pc-linux-gnu and hppa2.0w-hp-hpux11.11. This fixes broken new functionality on a secondary target; is it OK for 4.8.0 or should it wait for 4.8.1?
commit 145dab2e1e46ac025414e1a225e29caa2c3b41c1
Author: Jason Merrill <>
Date:   Mon Mar 11 12:31:16 2013 -0400

    	PR c++/56346
    	* decl.c (register_dtor_fn): Pass null to __cxa_thread_atexit
    	dso_handle parm on targets without __cxa_atexit.

diff --git a/gcc/cp/decl.c b/gcc/cp/decl.c
index 150e866..92114ff 100644
--- a/gcc/cp/decl.c
+++ b/gcc/cp/decl.c
@@ -6758,10 +6758,9 @@ register_dtor_fn (tree decl)
      "__aeabi_atexit"), and DECL is a class object, we can just pass the
      destructor to "__cxa_atexit"; we don't have to build a temporary
      function to do the cleanup.  */
-  ob_parm = (DECL_THREAD_LOCAL_P (decl)
-	     || (flag_use_cxa_atexit
-		 && !targetm.cxx.use_atexit_for_cxa_atexit ()));
-  dso_parm = ob_parm;
+  dso_parm = (flag_use_cxa_atexit
+	      && !targetm.cxx.use_atexit_for_cxa_atexit ());
+  ob_parm = (DECL_THREAD_LOCAL_P (decl) || dso_parm);
   use_dtor = ob_parm && CLASS_TYPE_P (type);
   if (use_dtor)
@@ -6825,7 +6824,7 @@ register_dtor_fn (tree decl)
 	 before passing it in, to avoid spurious errors.  */
       addr = build_nop (ptr_type_node, addr);
-  else if (ob_parm)
+  else
     /* Since the cleanup functions we build ignore the address
        they're given, there's no reason to pass the actual address
        in, and, in general, it's cheaper to pass NULL than any
@@ -6835,6 +6834,10 @@ register_dtor_fn (tree decl)
   if (dso_parm)
     arg2 = cp_build_addr_expr (get_dso_handle_node (),
+  else if (ob_parm)
+    /* Just pass NULL to the dso handle parm if we don't actually
+       have a DSO handle on this target.  */
+    arg2 = null_pointer_node;
     arg2 = NULL_TREE;

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