Reverted commit 143546 related to PR c++/26693

From-SVN: r143562

1 files changed, 0 insertions, 69 deletions

diff --git a/gcc/c-common.c b/gcc/c-common.c
index f398cf8..5eed1dc 100644
--- a/gcc/c-common.c
+++ b/gcc/c-common.c
@@ -8363,73 +8363,4 @@ warn_for_sign_compare (location_t location,
     }
 }
 
-/* Setup a TYPE_DECL node as a typedef representation.
-
-   X is a TYPE_DECL for a typedef statement.  Create a brand new
-   ..._TYPE node (which will be just a variant of the existing
-   ..._TYPE node with identical properties) and then install X
-   as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
-
-   The whole point here is to end up with a situation where each
-   and every ..._TYPE node the compiler creates will be uniquely
-   associated with AT MOST one node representing a typedef name.
-   This way, even though the compiler substitutes corresponding
-   ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
-   early on, later parts of the compiler can always do the reverse
-   translation and get back the corresponding typedef name.  For
-   example, given:
-
-	typedef struct S MY_TYPE;
-	MY_TYPE object;
-
-   Later parts of the compiler might only know that `object' was of
-   type `struct S' if it were not for code just below.  With this
-   code however, later parts of the compiler see something like:
-
-	struct S' == struct S
-	typedef struct S' MY_TYPE;
-	struct S' object;
-
-    And they can then deduce (from the node for type struct S') that
-    the original object declaration was:
-
-		MY_TYPE object;
-
-    Being able to do this is important for proper support of protoize,
-    and also for generating precise symbolic debugging information
-    which takes full account of the programmer's (typedef) vocabulary.
-
-    Obviously, we don't want to generate a duplicate ..._TYPE node if
-    the TYPE_DECL node that we are now processing really represents a
-    standard built-in type.  */
-
-void
-set_underlying_type (tree x)
-{
-  if (DECL_IS_BUILTIN (x))
-    {
-      if (TYPE_NAME (TREE_TYPE (x)) == 0)
-	TYPE_NAME (TREE_TYPE (x)) = x;
-    }
-  else if (TREE_TYPE (x) != error_mark_node
-	   && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
-    {
-      tree tt = TREE_TYPE (x);
-      DECL_ORIGINAL_TYPE (x) = tt;
-      tt = build_variant_type_copy (tt);
-      TYPE_STUB_DECL (tt) = TYPE_STUB_DECL (DECL_ORIGINAL_TYPE (x));
-      TYPE_NAME (tt) = x;
-      TREE_USED (tt) = TREE_USED (x);
-      TREE_TYPE (x) = tt;
-    }
-}
-
-/* Returns true if X is a typedef type.  */
-bool
-is_typedef_decl (tree x)
-{
-  return (x && TREE_CODE (x) == TYPE_DECL
-          && DECL_ORIGINAL_TYPE (x) != NULL_TREE);
-}
-
 #include "gt-c-common.h"