re PR c++/20350 (extern template and struct initializer and specification for a static variable)

cp:
	PR c++/20350
	* decl.c (duplicate_decls): Copy all of DECL_USE_TEMPLATE.
testsuite:
	PR c++/20350
	* g++.dg/template/spec24.C: New.

From-SVN: r100486

gcc/cp/ChangeLog

 2005-06-02  Nathan Sidwell  <nathan@codesourcery.com>
 
+	PR c++/20350
+	* decl.c (duplicate_decls): Copy all of DECL_USE_TEMPLATE.
+
 	PR c++/21151
 	* name-lookup.c (pushtag): Push local class even in a template.
 

gcc/cp/decl.c

@@ -1672,13 +1672,14 @@ duplicate_decls (tree newdecl, tree olddecl)
       DECL_COMDAT (newdecl) |= DECL_COMDAT (olddecl);
       DECL_TEMPLATE_INSTANTIATED (newdecl)
 	|= DECL_TEMPLATE_INSTANTIATED (olddecl);
-      /* If the OLDDECL is an implicit instantiation, then the NEWDECL
-	 must be too.  But, it may not yet be marked as such if the
-	 caller has created NEWDECL, but has not yet figured out that
-	 it is a redeclaration.  */
-      if (DECL_IMPLICIT_INSTANTIATION (olddecl)
-	  && !DECL_USE_TEMPLATE (newdecl))
-	SET_DECL_IMPLICIT_INSTANTIATION (newdecl);
+      
+      /* If the OLDDECL is an instantiation and/or specialization,
+	 then the NEWDECL must be too.  But, it may not yet be marked
+	 as such if the caller has created NEWDECL, but has not yet
+	 figured out that it is a redeclaration.  */
+      if (!DECL_USE_TEMPLATE (newdecl))
+	DECL_USE_TEMPLATE (newdecl) = DECL_USE_TEMPLATE (olddecl);
+      
       /* Don't really know how much of the language-specific
 	 values we should copy from old to new.  */
       DECL_IN_AGGR_P (newdecl) = DECL_IN_AGGR_P (olddecl);

gcc/testsuite/ChangeLog

 2005-06-02  Nathan Sidwell  <nathan@codesourcery.com>
 
+	PR c++/20350
+	* g++.dg/template/spec24.C: New.
+
 	PR c++/21151
 	* g++.dg/pch/local-1.C: New.
 	* g++.dg/pch/local-1.Hs: New.

gcc/testsuite/g++.dg/template/spec24.C

+// Copyright (C) 2005 Free Software Foundation, Inc.
+// Contributed by Nathan Sidwell 1 June 2005 <nathan@codesourcery.com>
+
+// PR 20350: ICE on member specialization with later initialization
+// Origin: Carlo Wood carlo@gcc.gnu.org
+
+template <int i> struct Mutex
+{
+  static int mutex;
+};
+
+template <int i>
+int Mutex<i>::mutex = {1};
+
+template <> int Mutex<0>::mutex;
+template <> int Mutex<0>::mutex = 0;
+
+void g()
+{
+  Mutex<0>::mutex = 0;
+}
+