re PR c++/15759 (ICE with function pointers)

	PR c++/15759
	* tree.c (bot_manip): Don't call mark_used.

	* g++.dg/other/default4.C: New test.

From-SVN: r111754

gcc/cp/ChangeLog

+2006-03-06  Volker Reichelt  <reichelt@igpm.rwth-aachen.de>
+
+	PR c++/15759
+	* tree.c (bot_manip): Don't call mark_used.
+
 2006-03-02  Mike Stump  <mrs@apple.com>
 
 	* decl2.c (import_export_decl): Remove redundant call to

gcc/cp/tree.c

@@ -1173,16 +1173,11 @@ bot_manip (tree* tp, int* walk_subtrees, void* data)
       tree u;
 
       if (TREE_CODE (TREE_OPERAND (t, 1)) == AGGR_INIT_EXPR)
-	{
-	  mark_used (TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (t, 1), 0), 0));
-	  u = build_cplus_new
-	    (TREE_TYPE (t), break_out_target_exprs (TREE_OPERAND (t, 1)));
-	}
+	u = build_cplus_new
+	  (TREE_TYPE (t), break_out_target_exprs (TREE_OPERAND (t, 1)));
       else
-	{
-	  u = build_target_expr_with_type
-	    (break_out_target_exprs (TREE_OPERAND (t, 1)), TREE_TYPE (t));
-	}
+	u = build_target_expr_with_type
+	  (break_out_target_exprs (TREE_OPERAND (t, 1)), TREE_TYPE (t));
 
       /* Map the old variable to the new one.  */
       splay_tree_insert (target_remap,
@@ -1197,8 +1192,6 @@ bot_manip (tree* tp, int* walk_subtrees, void* data)
       *walk_subtrees = 0;
       return NULL_TREE;
     }
-  else if (TREE_CODE (t) == CALL_EXPR)
-    mark_used (TREE_OPERAND (TREE_OPERAND (t, 0), 0));
 
   /* Make a copy of this node.  */
   return copy_tree_r (tp, walk_subtrees, NULL);

gcc/testsuite/ChangeLog

+2006-03-06  Volker Reichelt  <reichelt@igpm.rwth-aachen.de>
+
+	PR c++/15759
+	* g++.dg/other/default4.C: New test.
+
 2005-03-05  Erik Edelmann  <eedelman@gcc.gnu.org>
 
 	PR fortran/16136

gcc/testsuite/g++.dg/other/default4.C

+// PR c++/15759
+// Origin:   Lars Rune Nstdal  <larsnostdal@gmail.com>
+// Testcase: Volker Reichelt    <reichelt@igpm.rwth-aachen.de>
+
+// { dg-do run }
+
+extern "C" void abort();
+
+int n = 0;
+
+int f() { return ++n; }
+
+int(&foo1)() = f;
+int(*foo2)() = &f;
+int(*foo3)() = f;
+
+int bar1(int i = foo1()) { return i; }
+int bar2(int i = foo2()) { return i; }
+int bar3(int i = foo3()) { return i; }
+int bar4(int i = f())    { return i; }
+
+int main()
+{
+  if (bar1() != 1) abort();
+  if (bar2() != 2) abort();
+  if (bar3() != 3) abort();
+  if (bar4() != 4) abort();
+  return 0;
+}