re PR c++/19312 (ICE in stabilize_call when throwing a copy)

        PR c++/19312
        * tree.c (stabilize_init): Don't bother trying to stabilize
        something with no side-effects.

From-SVN: r97691

gcc/cp/ChangeLog

+2005-04-06  Jason Merrill  <jason@redhat.com>
+
+	PR c++/19312
+	* tree.c (stabilize_init): Don't bother trying to stabilize
+	something with no side-effects.
+
 2005-04-05  Mark Mitchell  <mark@codesourcery.com>
 
 	PR c++/20763

gcc/cp/tree.c

@@ -2257,7 +2257,10 @@ stabilize_init (tree init, tree *initp)
       if (TREE_CODE (t) == COND_EXPR)
 	return false;
 
-      stabilize_call (t, initp);
+      /* The TARGET_EXPR might be initializing via bitwise copy from
+	 another variable; leave that alone.  */
+      if (TREE_SIDE_EFFECTS (t))
+	stabilize_call (t, initp);
     }
 
   return true;

gcc/testsuite/g++.dg/eh/throw3.C

+// PR c++/19312
+
+struct A {};
+
+void foo(A a)
+{
+    throw (A)a;
+}