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preserve parameter attributes during C++ decl smashing

I'm sending this patch on Dave's behalf.

class Foo {
 void foo (char __attribute__((user("param"))) c);

void Foo::foo(char c) {

In above example the attribute is not preserved. Since there is no way to obtain the forward declaration signature once Foo::foo implementation is parsed, the attribute should be preserved.

Attached patch fixes that.


2009-04-22  David Mandelin <>:
      * decl.c (duplicate_decls): Preserve parameter attributes

diff --git a/gcc/cp/decl.c b/gcc/cp/decl.c
--- a/gcc/cp/decl.c
+++ b/gcc/cp/decl.c
@@ -1982,6 +1982,16 @@ duplicate_decls (tree newdecl, tree oldd
       if (! types_match || new_defines_function)
+          /* Make sure parameter attributes
+             are retained from the initial declaration. */
+          tree oldarg, newarg;
+          for (oldarg = DECL_ARGUMENTS(olddecl), 
+                 newarg = DECL_ARGUMENTS(newdecl);
+               oldarg && newarg;
+               oldarg = TREE_CHAIN(oldarg), newarg = TREE_CHAIN(newarg)) {
+            DECL_ATTRIBUTES (newarg)
+              = (*targetm.merge_decl_attributes) (oldarg, newarg);
+          }
 	  /* These need to be copied so that the names are available.
 	     Note that if the types do match, we'll preserve inline
 	     info and other bits, but if not, we won't.  */

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