From 392202b07dd6733e8adf84fecf439fb317dfcc2a Mon Sep 17 00:00:00 2001
From: Tom Wood <wood@gnu.org>
Date: Thu, 22 Apr 1993 11:48:29 +0000
Subject: [PATCH] *** empty log message ***

From-SVN: r4192
---
 gcc/c-typeck.c      | 30 ++++++++----------------------
 gcc/objc/objc-act.c | 29 ++++++++++++++++++-----------
 2 files changed, 26 insertions(+), 33 deletions(-)

diff --git a/gcc/c-typeck.c b/gcc/c-typeck.c
index c0443de5f70..bf2e56be6f6 100644
--- a/gcc/c-typeck.c
+++ b/gcc/c-typeck.c
@@ -461,7 +461,8 @@ comptypes (type1, type2)
       }
 
     case RECORD_TYPE:
-      return maybe_objc_comptypes (t1, t2, 0);
+      if (maybe_objc_comptypes (t1, t2, 0) == 1)
+	return 1;
     }
   return 0;
 }
@@ -473,29 +474,14 @@ static int
 comp_target_types (ttl, ttr)
      tree ttl, ttr;
 {
-  int val = 0;
-
-  if (doing_objc_thang)
-    {
-      /* Give maybe_objc_comptypes a crack at letting these types through.  */
-      val = maybe_objc_comptypes (ttl, ttr, 1);
+  int val;
 
-      if (val != 1 && !pedantic)
-	{
-	  /* Ignore pointer qualifiers recursively.  This way char **
-	     and const char ** are compatible.  */
-	  if (TREE_CODE (ttl) == POINTER_TYPE
-	      && TREE_CODE (ttr) == POINTER_TYPE)
-	    return comp_target_types (TYPE_MAIN_VARIANT (TREE_TYPE (ttl)),
-				      TYPE_MAIN_VARIANT (TREE_TYPE (ttr)));
-	  else
-	    return comptypes (ttl, ttr);
-	}
-    }
+  /* Give maybe_objc_comptypes a crack at letting these types through.  */
+  if (val = maybe_objc_comptypes (ttl, ttr, 1) >= 0)
+    return val;
 
-  if (val != 1)
-    val = comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (ttl)),
-		     TYPE_MAIN_VARIANT (TREE_TYPE (ttr)));
+  val = comptypes (TYPE_MAIN_VARIANT (TREE_TYPE (ttl)),
+		   TYPE_MAIN_VARIANT (TREE_TYPE (ttr)));
 
   if (val == 2 && pedantic)
     pedwarn ("types are not quite compatible");
diff --git a/gcc/objc/objc-act.c b/gcc/objc/objc-act.c
index d2cb9609bac..ec4cf3c9238 100644
--- a/gcc/objc/objc-act.c
+++ b/gcc/objc/objc-act.c
@@ -577,15 +577,17 @@ define_decl (declarator, declspecs)
   return decl;
 }
 
-/* Rules for statically typed objects.  Called from comptypes,
-   convert_for_assignment, and comp_target_types.
+/* Return 1 if LHS and RHS are compatible types for assignment or
+   various other operations.  Return 0 if they are incompatible, and
+   return -1 if we choose to not decide.  When the operation is
+   REFLEXIVE, check for compatibility in either direction.
 
-   An assignment of the form `a' = `b' is permitted if:
+   For statically typed objects, an assignment of the form `a' = `b'
+   is permitted if:
 
-   - `a' is of type "id".
-   - `a' and `b' are the same class type.
-   - `a' and `b' are of class types A and B such that B is a descendant
-     of A.  */
+   `a' is of type "id",
+   `a' and `b' are the same class type, or
+   `a' and `b' are of class types A and B such that B is a descendant of A.  */
 
 int
 maybe_objc_comptypes (lhs, rhs, reflexive)
@@ -594,7 +596,7 @@ maybe_objc_comptypes (lhs, rhs, reflexive)
 {
   if (doing_objc_thang)
     return objc_comptypes (lhs, rhs, reflexive);
-  return 0;
+  return -1;
 }
 
 static tree
@@ -662,6 +664,11 @@ lookup_protocol_in_reflist (rproto_list, lproto)
    return 0;
 }
 
+/* Return 1 if LHS and RHS are compatible types for assignment
+   or various other operations.  Return 0 if they are incompatible,
+   and return -1 if we choose to not decide.  When the operation
+   is REFLEXIVE, check for compatibility in either direction.  */
+
 int
 objc_comptypes (lhs, rhs, reflexive)
      tree lhs;
@@ -752,12 +759,12 @@ objc_comptypes (lhs, rhs, reflexive)
 	    return 1;	/* one of the types is a protocol */
 	}
       else
-	return 2;	/* defer to comptypes */
+	return -1;	/* defer to comptypes */
     }
   else if (TREE_CODE (lhs) == RECORD_TYPE && TREE_CODE (rhs) == RECORD_TYPE)
     ; /* fall thru...this is the case we have been handling all along */
   else
-    return 2;	/* defer to comptypes */
+    return -1;	/* defer to comptypes */
 
   /* End of new protocol support.  */
 
@@ -803,7 +810,7 @@ objc_comptypes (lhs, rhs, reflexive)
       return 0;
     }
   else
-    return 0;
+    return -1;	/* defer to comptypes */
 }
 
 /* Called from c-decl.c before all calls to rest_of_decl_compilation.  */
-- 
2.30.2