[PATCH, lto]: Handle *tm regparm attribute

[Uros Bizjak]

Hello!

Attached patch handles "*tm regparm" attribute, to avoid "*tm regparm"
attribute ignored warnings in lto compile on non-x86 targets.

2011-11-30  Uros Bizjak  <ubiz...@gmail.com>

        * lto-lang.c (lto_attribute_table): Handle *tm regparm.
        (ignore_attribute): New.

Tested on alphaev68-pc-linux-gnu and x86_64-pc-linux-gnu {,-m32}.

OK for mainline?

Uros.

Index: lto-lang.c
===================================================================
--- lto-lang.c  (revision 181835)
+++ lto-lang.c  (working copy)
@@ -47,6 +47,8 @@
 static tree handle_sentinel_attribute (tree *, tree, tree, int, bool *);
 static tree handle_type_generic_attribute (tree *, tree, tree, int, bool *);
 static tree handle_transaction_pure_attribute (tree *, tree, tree, int, bool 
*);
+static tree ignore_attribute (tree *, tree, tree, int, bool *);
+
 static tree handle_format_attribute (tree *, tree, tree, int, bool *);
 static tree handle_format_arg_attribute (tree *, tree, tree, int, bool *);
 
@@ -78,6 +80,10 @@
                              handle_type_generic_attribute, false },
   { "transaction_pure",              0, 0, false, true, true,
                              handle_transaction_pure_attribute, false },
+  /* For internal use only.  The leading '*' both prevents its usage in
+     source code and signals that it may be overridden by machine tables.  */
+  { "*tm regparm",            0, 0, false, true, true,
+                             ignore_attribute, false },
   { NULL,                     0, 0, false, false, false, NULL, false }
 };
 
@@ -419,6 +425,18 @@
   return NULL_TREE;
 }
 
+/* Ignore the given attribute.  Used when this attribute may be usefully
+   overridden by the target, but is not used generically.  */
+
+static tree
+ignore_attribute (tree * ARG_UNUSED (node), tree ARG_UNUSED (name),
+                 tree ARG_UNUSED (args), int ARG_UNUSED (flags),
+                 bool *no_add_attrs)
+{
+  *no_add_attrs = true;
+  return NULL_TREE;
+}
+
 /* Handle a "format" attribute; arguments as in
    struct attribute_spec.handler.  */