[PATCH 2/4] PR c++/13403 and PR c++/15154: Fix gnuv3_pass_by_reference to lookup copy c-tors with qualified args

[Siva Chandra <sivachandra@google.com>]

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Before this, a copy constructor declared as in the following snippet was
not being treated as a copy constructor.

class A
{
public:
  A (A &); // OK.
  A (const A &); // Not being treated as a copy constructor because of the
                 // 'const' qualifier.
};

gdb/ChangeLog:

2014-09-11  Siva Chandra Reddy  <sivachandra@google.com>

        PR c++/13403
        PR c++/15154
        * gdbtypes.c (make_qualified_type): Make non-static.
        * gdbtypes.h (make_qualified_type): Declare.
        * gnu-v3-abi.c (gnuv3_pass_by_reference): Lookup copy
        constructors with qualified args

[-- Attachment #2: fix_gnuv3_abi_fix1.txt --]
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diff --git a/gdb/gdbtypes.c b/gdb/gdbtypes.c
index 1326f85..0f5093d 100644
--- a/gdb/gdbtypes.c
+++ b/gdb/gdbtypes.c
@@ -568,7 +568,7 @@ address_space_int_to_name (struct gdbarch *gdbarch, int space_flag)
    If STORAGE is non-NULL, create the new type instance there.
    STORAGE must be in the same obstack as TYPE.  */
 
-static struct type *
+struct type *
 make_qualified_type (struct type *type, int new_flags,
 		     struct type *storage)
 {
diff --git a/gdb/gdbtypes.h b/gdb/gdbtypes.h
index bd1a0ab..80ed725 100644
--- a/gdb/gdbtypes.h
+++ b/gdb/gdbtypes.h
@@ -1647,6 +1647,9 @@ extern int address_space_name_to_int (struct gdbarch *, char *);
 
 extern const char *address_space_int_to_name (struct gdbarch *, int);
 
+extern struct type *make_qualified_type (struct type *type, int new_flags,
+					 struct type *storage);
+
 extern struct type *make_type_with_address_space (struct type *type, 
 						  int space_identifier);
 
diff --git a/gdb/gnu-v3-abi.c b/gdb/gnu-v3-abi.c
index d5ed355..a79a6a9 100644
--- a/gdb/gnu-v3-abi.c
+++ b/gdb/gnu-v3-abi.c
@@ -1313,11 +1313,19 @@ gnuv3_pass_by_reference (struct type *type)
 
 	/* If this method takes two arguments, and the second argument is
 	   a reference to this class, then it is a copy constructor.  */
-	if (TYPE_NFIELDS (fieldtype) == 2
-	    && TYPE_CODE (TYPE_FIELD_TYPE (fieldtype, 1)) == TYPE_CODE_REF
-	    && check_typedef (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (fieldtype,
-								 1))) == type)
-	  return 1;
+	if (TYPE_NFIELDS (fieldtype) == 2)
+	  {
+	    struct type *arg_type = TYPE_FIELD_TYPE (fieldtype, 1);
+	    struct type *arg_target_type;
+	    int flags;
+
+	    arg_target_type = check_typedef (TYPE_TARGET_TYPE (arg_type));
+	    flags = TYPE_INSTANCE_FLAGS (arg_target_type);
+
+	    if (TYPE_CODE (arg_type) == TYPE_CODE_REF
+		&& arg_target_type == make_qualified_type (type, flags, NULL))
+	      return 1;
+	  }
       }
 
   /* Even if all the constructors and destructors were artificial, one