[PATCH] fix PR45049, DECL_CHAIN error

[Nathan Froyd]

The patch below fixes PR45049 by changing offending DECL_CHAINs back to
TREE_CHAINs.

Tested on x86_64-unknown-linux-gnu.  OK to commit?

-Nathan

gcc/cp/
	PR c++/45049
	* name-lookup.c (push_overloaded_decl): Change DECL_CHAIN to
	TREE_CHAIN.

gcc/testsuite/
	PR c++/45049
	* g++.dg/pr45049-1.C: New test.
	* g++.dg/pr45049-2.C: New test.

diff --git a/gcc/cp/name-lookup.c b/gcc/cp/name-lookup.c
index 01f29e4..800e340 100644
--- a/gcc/cp/name-lookup.c
+++ b/gcc/cp/name-lookup.c
@@ -2157,7 +2157,7 @@ push_overloaded_decl (tree decl, int flags, bool is_friend)
 
 	  for (d = &IDENTIFIER_BINDING (name)->scope->names;
 	       *d;
-	       d = &DECL_CHAIN (*d))
+	       d = &TREE_CHAIN (*d))
 	    if (*d == old
 		|| (TREE_CODE (*d) == TREE_LIST
 		    && TREE_VALUE (*d) == old))
@@ -2168,7 +2168,7 @@ push_overloaded_decl (tree decl, int flags, bool is_friend)
 		else
 		  /* Build a TREE_LIST to wrap the OVERLOAD.  */
 		  *d = tree_cons (NULL_TREE, new_binding,
-				  DECL_CHAIN (*d));
+				  TREE_CHAIN (*d));
 
 		/* And update the cxx_binding node.  */
 		IDENTIFIER_BINDING (name)->value = new_binding;
diff --git a/gcc/testsuite/g++.dg/pr45049-1.C b/gcc/testsuite/g++.dg/pr45049-1.C
new file mode 100644
index 0000000..7863a6b
--- /dev/null
+++ b/gcc/testsuite/g++.dg/pr45049-1.C
@@ -0,0 +1,15 @@
+namespace n1 {
+  void modf ();
+}
+
+namespace n2 {
+  void trunc ();
+  void modf ();
+}
+    
+void max ()
+{
+  using n1::modf;
+  using n2::trunc;
+  using n2::modf;
+}
diff --git a/gcc/testsuite/g++.dg/pr45049-2.C b/gcc/testsuite/g++.dg/pr45049-2.C
new file mode 100644
index 0000000..ea1f6d6
--- /dev/null
+++ b/gcc/testsuite/g++.dg/pr45049-2.C
@@ -0,0 +1,7 @@
+void foo()
+{
+  void bar(int);
+  void baz(int);
+  void baz(void);
+  void bar(void);
+}