Patchwork [C++] Remove uses of ATTRIBUTE_UNUSED in the function parameters

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Submitter Paolo Carlini
Date Sept. 11, 2012, 3:29 p.m.
Message ID <504F58C8.5050502@oracle.com>
Download mbox | patch
Permalink /patch/183138/
State New
Headers show

Comments

Paolo Carlini - Sept. 11, 2012, 3:29 p.m.
Hi,

since we are now using C++, I think we can remove the attributes and 
just use unnamed parameters. For now I kept the names in comments for 
documentation purposes, but would be glad to remove those too, if you like.

Booted and tested x86_64-linux.

Thanks,
Paolo.

PS: slightly interesting, in a couple of cases - 
write_unnamed_type_name, wrap_cleanups_r - the parameters were actually 
used.

//////////////////////
2012-09-11  Paolo Carlini  <paolo.carlini@oracle.com>

	* typeck.c (build_indirect_ref, build_function_call,
	build_function_call_vec, build_binary_op, build_unary_op,
	build_compound_expr, build_c_cast, build_modify_expr): Remove
	uses of ATTRIBUTE_UNUSED on the parameters.
	* class.c (set_linkage_according_to_type, resort_type_method_vec,
	dfs_find_final_overrider_post, empty_base_at_nonzero_offset_p):
	Likewise.
	* decl.c (local_variable_p_walkfn): Likewise.
	* except.c (wrap_cleanups_r, check_noexcept_r): Likewise.
	* error.c (find_typenames_r): Likewise.
	* tree.c (verify_stmt_tree_r, bot_replace,
	handle_java_interface_attribute, handle_com_interface_attribute,
	handle_init_priority_attribute, c_register_addr_space): Likewise.
	* cp-gimplify.c (cxx_omp_clause_default_ctor): Likewise.
	* cp-lang.c (objcp_tsubst_copy_and_build): Likewise.
	* pt.c (unify_success, unify_invalid, instantiation_dependent_r):
	Likewise.
	* semantics.c (dfs_calculate_bases_pre): Likewise.
	* decl2.c (fix_temporary_vars_context_r, clear_decl_external):
	Likewise.
	* parser.c (cp_lexer_token_at, cp_parser_omp_clause_mergeable,
	cp_parser_omp_clause_nowait, cp_parser_omp_clause_ordered,
	cp_parser_omp_clause_untied): Likewise.
	* mangle.c (write_unnamed_type_name,
	discriminator_for_string_literal): Likewise.
	* search.c (dfs_accessible_post, dfs_debug_mark): Likewise.
	* lex.c (handle_pragma_vtable, handle_pragma_unit,
	handle_pragma_interface, handle_pragma_implementation,
	handle_pragma_java_exceptions): Likewise.
Jakub Jelinek - Sept. 11, 2012, 3:37 p.m.
On Tue, Sep 11, 2012 at 05:29:12PM +0200, Paolo Carlini wrote:
> PS: slightly interesting, in a couple of cases -
> write_unnamed_type_name, wrap_cleanups_r - the parameters were
> actually used.

Just a general comment, often an argument is only conditionally used,
e.g. depending on some preprocessor macro (e.g. target hook).  In that
case unnamed parameter is not an option, but dropping ATTRIBUTE_UNUSED is
not desirable either.

	Jakub
Paolo Carlini - Sept. 11, 2012, 4:17 p.m.
On 09/11/2012 05:37 PM, Jakub Jelinek wrote:
> On Tue, Sep 11, 2012 at 05:29:12PM +0200, Paolo Carlini wrote:
>> PS: slightly interesting, in a couple of cases -
>> write_unnamed_type_name, wrap_cleanups_r - the parameters were
>> actually used.
> Just a general comment, often an argument is only conditionally used,
> e.g. depending on some preprocessor macro (e.g. target hook).  In that
> case unnamed parameter is not an option, but dropping ATTRIBUTE_UNUSED is
> not desirable either.
Of course. As far as I can see, that isn't the case for the C++ 
front-end uses, but hey, if you spot something which *may* be less than 
straightforward in my patch, please let me know asap!

Paolo.
Gabriel Dos Reis - Sept. 11, 2012, 4:53 p.m.
On Tue, Sep 11, 2012 at 10:37 AM, Jakub Jelinek <jakub@redhat.com> wrote:
> On Tue, Sep 11, 2012 at 05:29:12PM +0200, Paolo Carlini wrote:
>> PS: slightly interesting, in a couple of cases -
>> write_unnamed_type_name, wrap_cleanups_r - the parameters were
>> actually used.
>
> Just a general comment, often an argument is only conditionally used,
> e.g. depending on some preprocessor macro (e.g. target hook).  In that
> case unnamed parameter is not an option, but dropping ATTRIBUTE_UNUSED is
> not desirable either.

That a parameter is unused in a function body should be clear from the context.
And in those case, it is desirable that the parameter be unnamed, and
the attribute
be dropped.  That is what Paolo's patch is doing.  That should not be
controversial.

-- Gaby
Richard Guenther - Sept. 12, 2012, 8:57 a.m.
On Tue, Sep 11, 2012 at 5:37 PM, Jakub Jelinek <jakub@redhat.com> wrote:
> On Tue, Sep 11, 2012 at 05:29:12PM +0200, Paolo Carlini wrote:
>> PS: slightly interesting, in a couple of cases -
>> write_unnamed_type_name, wrap_cleanups_r - the parameters were
>> actually used.
>
> Just a general comment, often an argument is only conditionally used,
> e.g. depending on some preprocessor macro (e.g. target hook).  In that
> case unnamed parameter is not an option, but dropping ATTRIBUTE_UNUSED is
> not desirable either.

And note that we have ARG_UNUSED for parameters - to cope with older
compilers not handling attributes here too well (I run into this when using
gcc 3.3 as host compiler).

Richard.

>         Jakub
Paolo Carlini - Sept. 12, 2012, 9:59 a.m.
On 09/12/2012 10:57 AM, Richard Guenther wrote:
> And note that we have ARG_UNUSED for parameters - to cope with older 
> compilers not handling attributes here too well (I run into this when 
> using gcc 3.3 as host compiler).
Ah, thanks, I didn't know that (both the problem and the solution): it 
seems (another) good reason to just get rid of as many ATTRIBUTE_UNUSED 
as possible!

Paolo.
Paolo Carlini - Sept. 13, 2012, 2 p.m.
On 09/11/2012 06:53 PM, Gabriel Dos Reis wrote:
> On Tue, Sep 11, 2012 at 10:37 AM, Jakub Jelinek <jakub@redhat.com> wrote:
>> On Tue, Sep 11, 2012 at 05:29:12PM +0200, Paolo Carlini wrote:
>>> PS: slightly interesting, in a couple of cases -
>>> write_unnamed_type_name, wrap_cleanups_r - the parameters were
>>> actually used.
>> Just a general comment, often an argument is only conditionally used,
>> e.g. depending on some preprocessor macro (e.g. target hook).  In that
>> case unnamed parameter is not an option, but dropping ATTRIBUTE_UNUSED is
>> not desirable either.
> That a parameter is unused in a function body should be clear from the context.
> And in those case, it is desirable that the parameter be unnamed, and
> the attribute
> be dropped.  That is what Paolo's patch is doing.  That should not be
> controversial.
Thanks. Thus, I suppose I can ho ahead... If I don't hear further 
comments, tonight I will.

Paolo.
Gabriel Dos Reis - Sept. 13, 2012, 2:24 p.m.
On Thu, Sep 13, 2012 at 9:00 AM, Paolo Carlini <paolo.carlini@oracle.com> wrote:
> On 09/11/2012 06:53 PM, Gabriel Dos Reis wrote:
>>
>> On Tue, Sep 11, 2012 at 10:37 AM, Jakub Jelinek <jakub@redhat.com> wrote:
>>>
>>> On Tue, Sep 11, 2012 at 05:29:12PM +0200, Paolo Carlini wrote:
>>>>
>>>> PS: slightly interesting, in a couple of cases -
>>>> write_unnamed_type_name, wrap_cleanups_r - the parameters were
>>>> actually used.
>>>
>>> Just a general comment, often an argument is only conditionally used,
>>> e.g. depending on some preprocessor macro (e.g. target hook).  In that
>>> case unnamed parameter is not an option, but dropping ATTRIBUTE_UNUSED is
>>> not desirable either.
>>
>> That a parameter is unused in a function body should be clear from the
>> context.
>> And in those case, it is desirable that the parameter be unnamed, and
>> the attribute
>> be dropped.  That is what Paolo's patch is doing.  That should not be
>> controversial.
>
> Thanks. Thus, I suppose I can ho ahead... If I don't hear further comments,
> tonight I will.
>
> Paolo.

Indeed.

-- Gaby

Patch

Index: typeck.c
===================================================================
--- typeck.c	(revision 191177)
+++ typeck.c	(working copy)
@@ -2772,7 +2772,7 @@  build_x_indirect_ref (location_t loc, tree expr, r
 
 /* Helper function called from c-common.  */
 tree
-build_indirect_ref (location_t loc ATTRIBUTE_UNUSED,
+build_indirect_ref (location_t /*loc*/,
 		    tree ptr, ref_operator errorstring)
 {
   return cp_build_indirect_ref (ptr, errorstring, tf_warning_or_error);
@@ -3207,7 +3207,7 @@  get_member_function_from_ptrfunc (tree *instance_p
 
 /* Used by the C-common bits.  */
 tree
-build_function_call (location_t loc ATTRIBUTE_UNUSED, 
+build_function_call (location_t /*loc*/, 
 		     tree function, tree params)
 {
   return cp_build_function_call (function, params, tf_warning_or_error);
@@ -3215,9 +3215,9 @@  tree
 
 /* Used by the C-common bits.  */
 tree
-build_function_call_vec (location_t loc ATTRIBUTE_UNUSED,
+build_function_call_vec (location_t /*loc*/,
 			 tree function, VEC(tree,gc) *params,
-			 VEC(tree,gc) *origtypes ATTRIBUTE_UNUSED)
+			 VEC(tree,gc) * /*origtypes*/)
 {
   VEC(tree,gc) *orig_params = params;
   tree ret = cp_build_function_call_vec (function, &params,
@@ -3693,7 +3693,7 @@  enum_cast_to_int (tree op)
 /* For the c-common bits.  */
 tree
 build_binary_op (location_t location, enum tree_code code, tree op0, tree op1,
-		 int convert_p ATTRIBUTE_UNUSED)
+		 int /*convert_p*/)
 {
   return cp_build_binary_op (location, code, op0, op1, tf_warning_or_error);
 }
@@ -5448,7 +5448,7 @@  cp_build_unary_op (enum tree_code code, tree xarg,
 
 /* Hook for the c-common bits that build a unary op.  */
 tree
-build_unary_op (location_t location ATTRIBUTE_UNUSED,
+build_unary_op (location_t /*location*/,
 		enum tree_code code, tree xarg, int noconvert)
 {
   return cp_build_unary_op (code, xarg, noconvert, tf_warning_or_error);
@@ -5784,7 +5784,7 @@  build_x_compound_expr (location_t loc, tree op1, t
 /* Like cp_build_compound_expr, but for the c-common bits.  */
 
 tree
-build_compound_expr (location_t loc ATTRIBUTE_UNUSED, tree lhs, tree rhs)
+build_compound_expr (location_t /*loc*/, tree lhs, tree rhs)
 {
   return cp_build_compound_expr (lhs, rhs, tf_warning_or_error);
 }
@@ -6652,7 +6652,7 @@  build_const_cast (tree type, tree expr, tsubst_fla
 /* Like cp_build_c_cast, but for the c-common bits.  */
 
 tree
-build_c_cast (location_t loc ATTRIBUTE_UNUSED, tree type, tree expr)
+build_c_cast (location_t /*loc*/, tree type, tree expr)
 {
   return cp_build_c_cast (type, expr, tf_warning_or_error);
 }
@@ -6782,11 +6782,11 @@  cp_build_c_cast (tree type, tree expr, tsubst_flag
 
 /* For use from the C common bits.  */
 tree
-build_modify_expr (location_t location ATTRIBUTE_UNUSED,
-		   tree lhs, tree lhs_origtype ATTRIBUTE_UNUSED,
+build_modify_expr (location_t /*location*/,
+		   tree lhs, tree /*lhs_origtype*/,
 		   enum tree_code modifycode, 
-		   location_t rhs_location ATTRIBUTE_UNUSED, tree rhs,
-		   tree rhs_origtype ATTRIBUTE_UNUSED)
+		   location_t /*rhs_location*/, tree rhs,
+		   tree /*rhs_origtype*/)
 {
   return cp_build_modify_expr (lhs, modifycode, rhs, tf_warning_or_error);
 }
Index: class.c
===================================================================
--- class.c	(revision 191177)
+++ class.c	(working copy)
@@ -711,7 +711,7 @@  get_vtable_name (tree type)
    the abstract.  */
 
 void
-set_linkage_according_to_type (tree type ATTRIBUTE_UNUSED, tree decl)
+set_linkage_according_to_type (tree /*type*/, tree decl)
 {
   TREE_PUBLIC (decl) = 1;
   determine_visibility (decl);
@@ -1820,7 +1820,7 @@  resort_method_name_cmp (const void* m1_p, const vo
 
 void
 resort_type_method_vec (void* obj,
-			void* orig_obj ATTRIBUTE_UNUSED ,
+			void* /*orig_obj*/,
 			gt_pointer_operator new_value,
 			void* cookie)
 {
@@ -2039,7 +2039,7 @@  dfs_find_final_overrider_pre (tree binfo, void *da
 }
 
 static tree
-dfs_find_final_overrider_post (tree binfo ATTRIBUTE_UNUSED, void *data)
+dfs_find_final_overrider_post (tree /*binfo*/, void *data)
 {
   find_final_overrider_data *ffod = (find_final_overrider_data *) data;
   VEC_pop (tree, ffod->path);
@@ -3771,7 +3771,7 @@  layout_nonempty_base_or_field (record_layout_info
 static int
 empty_base_at_nonzero_offset_p (tree type,
 				tree offset,
-				splay_tree offsets ATTRIBUTE_UNUSED)
+				splay_tree /*offsets*/)
 {
   return is_empty_class (type) && !integer_zerop (offset);
 }
Index: decl.c
===================================================================
--- decl.c	(revision 191177)
+++ decl.c	(working copy)
@@ -10536,7 +10536,7 @@  local_variable_p (const_tree t)
 
 static tree
 local_variable_p_walkfn (tree *tp, int *walk_subtrees,
-			 void *data ATTRIBUTE_UNUSED)
+			 void * /*data*/)
 {
   /* Check DECL_NAME to avoid including temporaries.  We don't check
      DECL_ARTIFICIAL because we do want to complain about 'this'.  */
Index: except.c
===================================================================
--- except.c	(revision 191177)
+++ except.c	(working copy)
@@ -671,8 +671,7 @@  do_free_exception (tree ptr)
    Called from build_throw via walk_tree_without_duplicates.  */
 
 static tree
-wrap_cleanups_r (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
-		 void *data ATTRIBUTE_UNUSED)
+wrap_cleanups_r (tree *tp, int *walk_subtrees, void * /*data*/)
 {
   tree exp = *tp;
   tree cleanup;
@@ -1129,8 +1128,7 @@  check_handlers (tree handlers)
      expression whose type is a polymorphic class type (10.3).  */
 
 static tree
-check_noexcept_r (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
-		  void *data ATTRIBUTE_UNUSED)
+check_noexcept_r (tree *tp, int * /*walk_subtrees*/, void * /*data*/)
 {
   tree t = *tp;
   enum tree_code code = TREE_CODE (t);
Index: error.c
===================================================================
--- error.c	(revision 191177)
+++ error.c	(working copy)
@@ -1285,7 +1285,7 @@  struct find_typenames_t
 };
 
 static tree
-find_typenames_r (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED, void *data)
+find_typenames_r (tree *tp, int * /*walk_subtrees*/, void *data)
 {
   struct find_typenames_t *d = (struct find_typenames_t *)data;
   tree mv = NULL_TREE;
Index: tree.c
===================================================================
--- tree.c	(revision 191177)
+++ tree.c	(working copy)
@@ -1915,9 +1915,7 @@  count_trees (tree t)
 /* Called from verify_stmt_tree via walk_tree.  */
 
 static tree
-verify_stmt_tree_r (tree* tp,
-		    int* walk_subtrees ATTRIBUTE_UNUSED ,
-		    void* data)
+verify_stmt_tree_r (tree* tp, int * /*walk_subtrees*/, void* data)
 {
   tree t = *tp;
   htab_t *statements = (htab_t *) data;
@@ -2155,9 +2153,7 @@  bot_manip (tree* tp, int* walk_subtrees, void* dat
    variables.  */
 
 static tree
-bot_replace (tree* t,
-	     int* walk_subtrees ATTRIBUTE_UNUSED ,
-	     void* data)
+bot_replace (tree* t, int* /*walk_subtrees*/, void* data)
 {
   splay_tree target_remap = ((splay_tree) data);
 
@@ -3001,7 +2997,7 @@  const struct attribute_spec cxx_attribute_table[]
 static tree
 handle_java_interface_attribute (tree* node,
 				 tree name,
-				 tree args ATTRIBUTE_UNUSED ,
+				 tree /*args*/,
 				 int flags,
 				 bool* no_add_attrs)
 {
@@ -3026,8 +3022,8 @@  handle_java_interface_attribute (tree* node,
 static tree
 handle_com_interface_attribute (tree* node,
 				tree name,
-				tree args ATTRIBUTE_UNUSED ,
-				int flags ATTRIBUTE_UNUSED ,
+				tree /*args*/,
+				int /*flags*/,
 				bool* no_add_attrs)
 {
   static int warned;
@@ -3056,7 +3052,7 @@  static tree
 handle_init_priority_attribute (tree* node,
 				tree name,
 				tree args,
-				int flags ATTRIBUTE_UNUSED ,
+				int /*flags*/,
 				bool* no_add_attrs)
 {
   tree initp_expr = TREE_VALUE (args);
@@ -3770,8 +3766,7 @@  cp_free_lang_data (tree t)
    should be a C target hook.  But currently this is not possible,
    because this function is called via REGISTER_TARGET_PRAGMAS.  */
 void
-c_register_addr_space (const char *word ATTRIBUTE_UNUSED,
-		       addr_space_t as ATTRIBUTE_UNUSED)
+c_register_addr_space (const char * /*word*/, addr_space_t /*as*/)
 {
 }
 
Index: cp-gimplify.c
===================================================================
--- cp-gimplify.c	(revision 191177)
+++ cp-gimplify.c	(working copy)
@@ -1318,8 +1318,7 @@  cxx_omp_clause_apply_fn (tree fn, tree arg1, tree
    NULL if there's nothing to do.  */
 
 tree
-cxx_omp_clause_default_ctor (tree clause, tree decl,
-			     tree outer ATTRIBUTE_UNUSED)
+cxx_omp_clause_default_ctor (tree clause, tree decl, tree /*outer*/)
 {
   tree info = CP_OMP_CLAUSE_INFO (clause);
   tree ret = NULL;
Index: cp-lang.c
===================================================================
--- cp-lang.c	(revision 191177)
+++ cp-lang.c	(working copy)
@@ -92,11 +92,11 @@  struct lang_hooks lang_hooks = LANG_HOOKS_INITIALI
 /* The following function does something real, but only in Objective-C++.  */
 
 tree
-objcp_tsubst_copy_and_build (tree t ATTRIBUTE_UNUSED,
-			     tree args ATTRIBUTE_UNUSED,
-			     tsubst_flags_t complain ATTRIBUTE_UNUSED,
-			     tree in_decl ATTRIBUTE_UNUSED,
-			     bool function_p ATTRIBUTE_UNUSED)
+objcp_tsubst_copy_and_build (tree /*t*/,
+			     tree /*args*/,
+			     tsubst_flags_t /*complain*/,
+			     tree /*in_decl*/,
+			     bool /*function_p*/)
 {
   return NULL_TREE;
 }
Index: pt.c
===================================================================
--- pt.c	(revision 191177)
+++ pt.c	(working copy)
@@ -5187,7 +5187,7 @@  has_value_dependent_address (tree op)
    call.c  */
 
 static int
-unify_success (bool explain_p ATTRIBUTE_UNUSED)
+unify_success (bool /*explain_p*/)
 {
   return 0;
 }
@@ -5202,7 +5202,7 @@  unify_parameter_deduction_failure (bool explain_p,
 }
 
 static int
-unify_invalid (bool explain_p ATTRIBUTE_UNUSED)
+unify_invalid (bool /*explain_p*/)
 {
   return 1;
 }
@@ -19549,7 +19549,7 @@  type_dependent_expression_p (tree expression)
 
 static tree
 instantiation_dependent_r (tree *tp, int *walk_subtrees,
-			   void *data ATTRIBUTE_UNUSED)
+			   void * /*data*/)
 {
   if (TYPE_P (*tp))
     {
Index: semantics.c
===================================================================
--- semantics.c	(revision 191177)
+++ semantics.c	(working copy)
@@ -3455,7 +3455,7 @@  calculate_direct_bases (tree type)
 /* Virtual base classes are handled separately in finish_bases */
 
 static tree
-dfs_calculate_bases_pre (tree binfo, ATTRIBUTE_UNUSED void *data_)
+dfs_calculate_bases_pre (tree binfo, void * /*data_*/)
 {
   /* Don't walk bases of virtual bases */
   return BINFO_VIRTUAL_P (binfo) ? dfs_skip_bases : NULL_TREE;
Index: decl2.c
===================================================================
--- decl2.c	(revision 191177)
+++ decl2.c	(working copy)
@@ -3037,8 +3037,8 @@  get_priority_info (int priority)
    it's DECL_CONTECT() properly set.  */
 static tree 
 fix_temporary_vars_context_r (tree *node,
-			      int  *unused ATTRIBUTE_UNUSED,
-			      void *unused1 ATTRIBUTE_UNUSED)
+			      int  * /*unused*/,
+			      void * /*unused1*/)
 {
   gcc_assert (current_function_decl);
 
@@ -3656,7 +3656,7 @@  collect_all_refs (const char *source_file)
 /* Clear DECL_EXTERNAL for NODE.  */
 
 static bool
-clear_decl_external (struct cgraph_node *node, void *data ATTRIBUTE_UNUSED)
+clear_decl_external (struct cgraph_node *node, void * /*data*/)
 {
   DECL_EXTERNAL (node->symbol.decl) = 0;
   return false;
Index: parser.c
===================================================================
--- parser.c	(revision 191177)
+++ parser.c	(working copy)
@@ -667,7 +667,7 @@  cp_lexer_token_position (cp_lexer *lexer, bool pre
 }
 
 static inline cp_token *
-cp_lexer_token_at (cp_lexer *lexer ATTRIBUTE_UNUSED, cp_token_position pos)
+cp_lexer_token_at (cp_lexer * /*lexer*/, cp_token_position pos)
 {
   return pos;
 }
@@ -25322,7 +25322,7 @@  cp_parser_omp_clause_if (cp_parser *parser, tree l
    mergeable */
 
 static tree
-cp_parser_omp_clause_mergeable (cp_parser *parser ATTRIBUTE_UNUSED,
+cp_parser_omp_clause_mergeable (cp_parser * /*parser*/,
 				tree list, location_t location)
 {
   tree c;
@@ -25339,7 +25339,7 @@  static tree
    nowait */
 
 static tree
-cp_parser_omp_clause_nowait (cp_parser *parser ATTRIBUTE_UNUSED,
+cp_parser_omp_clause_nowait (cp_parser * /*parser*/,
 			     tree list, location_t location)
 {
   tree c;
@@ -25385,7 +25385,7 @@  cp_parser_omp_clause_num_threads (cp_parser *parse
    ordered */
 
 static tree
-cp_parser_omp_clause_ordered (cp_parser *parser ATTRIBUTE_UNUSED,
+cp_parser_omp_clause_ordered (cp_parser * /*parser*/,
 			      tree list, location_t location)
 {
   tree c;
@@ -25578,7 +25578,7 @@  cp_parser_omp_clause_schedule (cp_parser *parser,
    untied */
 
 static tree
-cp_parser_omp_clause_untied (cp_parser *parser ATTRIBUTE_UNUSED,
+cp_parser_omp_clause_untied (cp_parser * /*parser*/,
 			     tree list, location_t location)
 {
   tree c;
Index: mangle.c
===================================================================
--- mangle.c	(revision 191177)
+++ mangle.c	(working copy)
@@ -1337,7 +1337,7 @@  nested_anon_class_index (tree type)
 /* <unnamed-type-name> ::= Ut [ <nonnegative number> ] _ */
 
 static void
-write_unnamed_type_name (const tree type ATTRIBUTE_UNUSED)
+write_unnamed_type_name (const tree type)
 {
   int discriminator;
   MANGLE_TRACE_TREE ("unnamed-type-name", type);
@@ -1694,8 +1694,8 @@  discriminator_for_local_entity (tree entity)
    string literals used in FUNCTION.  */
 
 static int
-discriminator_for_string_literal (tree function ATTRIBUTE_UNUSED,
-				  tree string ATTRIBUTE_UNUSED)
+discriminator_for_string_literal (tree /*function*/,
+				  tree /*string*/)
 {
   /* For now, we don't discriminate amongst string literals.  */
   return 0;
Index: search.c
===================================================================
--- search.c	(revision 191177)
+++ search.c	(working copy)
@@ -819,7 +819,7 @@  friend_accessible_p (tree scope, tree decl, tree b
 /* Called via dfs_walk_once_accessible from accessible_p */
 
 static tree
-dfs_accessible_post (tree binfo, void *data ATTRIBUTE_UNUSED)
+dfs_accessible_post (tree binfo, void * /*data*/)
 {
   if (BINFO_ACCESS (binfo) != ak_none)
     {
@@ -2160,7 +2160,7 @@  maybe_suppress_debug_info (tree t)
    information anyway.  */
 
 static tree
-dfs_debug_mark (tree binfo, void *data ATTRIBUTE_UNUSED)
+dfs_debug_mark (tree binfo, void * /*data*/)
 {
   tree t = BINFO_TYPE (binfo);
 
Index: lex.c
===================================================================
--- lex.c	(revision 191177)
+++ lex.c	(working copy)
@@ -330,21 +330,21 @@  parse_strconst_pragma (const char* name, int opt)
 }
 
 static void
-handle_pragma_vtable (cpp_reader* dfile ATTRIBUTE_UNUSED )
+handle_pragma_vtable (cpp_reader* /*dfile*/)
 {
   parse_strconst_pragma ("vtable", 0);
   sorry ("#pragma vtable no longer supported");
 }
 
 static void
-handle_pragma_unit (cpp_reader* dfile ATTRIBUTE_UNUSED )
+handle_pragma_unit (cpp_reader* /*dfile*/)
 {
   /* Validate syntax, but don't do anything.  */
   parse_strconst_pragma ("unit", 0);
 }
 
 static void
-handle_pragma_interface (cpp_reader* dfile ATTRIBUTE_UNUSED )
+handle_pragma_interface (cpp_reader* /*dfile*/)
 {
   tree fname = parse_strconst_pragma ("interface", 1);
   struct c_fileinfo *finfo;
@@ -384,7 +384,7 @@  static void
    any effect.  */
 
 static void
-handle_pragma_implementation (cpp_reader* dfile ATTRIBUTE_UNUSED )
+handle_pragma_implementation (cpp_reader* /*dfile*/)
 {
   tree fname = parse_strconst_pragma ("implementation", 1);
   const char *filename;
@@ -425,7 +425,7 @@  static void
 
 /* Indicate that this file uses Java-personality exception handling.  */
 static void
-handle_pragma_java_exceptions (cpp_reader* dfile ATTRIBUTE_UNUSED)
+handle_pragma_java_exceptions (cpp_reader* /*dfile*/)
 {
   tree x;
   if (pragma_lex (&x) != CPP_EOF)