[Bug c++/64431] "-Wignored-qualifiers" warning gives misleading position in code

["manu at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64431

Manuel LÃpez-IbÃÃez <manu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |diagnostic
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2014-12-29
                 CC|                            |manu at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #2 from Manuel LÃpez-IbÃÃez <manu at gcc dot gnu.org> ---
This is a problem also in C, however, in C++ it is trivial to fix:

Index: gcc/cp/decl.c
===================================================================
--- gcc/cp/decl.c       (revision 218749)
+++ gcc/cp/decl.c       (working copy)
@@ -9686,11 +9686,11 @@ grokdeclarator (const cp_declarator *dec
               Make sure we have a valid type for the function to return.  */

            if (type_quals != TYPE_UNQUALIFIED)
              {
                if (SCALAR_TYPE_P (type) || VOID_TYPE_P (type))
-                 warning (OPT_Wignored_qualifiers,
+                 warning_at (declspecs->locations[ds_const],
OPT_Wignored_qualifiers,
                           "type qualifiers ignored on function return type");
                /* We now know that the TYPE_QUALS don't apply to the
                   decl, but to its return type.  */
                type_quals = TYPE_UNQUALIFIED;
              }

I would suggest to add a testcase with explicit column numbers.

I added this to the list of EasyHacks and I'll leave it to a new dev to fix it
(see
https://gcc.gnu.org/wiki/GettingStarted#Basics:_Contributing_to_GCC_in_10_easy_steps
if you want to be the one)