--- gcc/objc/hash.h	2018/04/24 18:10:18	1.1.1.2
+++ gcc/objc/hash.h	2018/04/24 18:26:56	1.1.1.5
@@ -1,5 +1,5 @@
 /* Hash tables for Objective C method dispatch.
-   Copyright (C) 1993 Free Software Foundation, Inc.
+   Copyright (C) 1993, 1995 Free Software Foundation, Inc.
 
 This file is part of GNU CC.
 
@@ -15,7 +15,8 @@ GNU General Public License for more deta
 
 You should have received a copy of the GNU General Public License
 along with GNU CC; see the file COPYING.  If not, write to
-the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+the Free Software Foundation, 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
 
 /* As a special exception, if you link this library with files
    compiled with GCC to produce an executable, this does not cause
@@ -27,11 +28,7 @@ the Free Software Foundation, 675 Mass A
 #ifndef __hash_INCLUDE_GNU
 #define __hash_INCLUDE_GNU
 
-#ifdef IN_GCC
-#include "gstddef.h"
-#else
-#include "stddef.h"
-#endif
+#include <stddef.h>
 
 /*
  * This data structure is used to hold items
@@ -66,7 +63,7 @@ typedef unsigned int (*hash_func_type)(v
 /*
  * This data type is the function that compares two hash keys and returns an
  * integer greater than, equal to, or less than 0, according as the first
- * parameter is lexico-graphically greater than, equal to, or less than the
+ * parameter is lexicographically greater than, equal to, or less than the
  * second. 
  */
 
@@ -117,7 +114,7 @@ cache_ptr hash_new (unsigned int size,
 void hash_delete (cache_ptr cache);
 
 /* Add the key/value pair to the hash table.  If the
-   hash table reaches a level of fullnes then it will be resized. 
+   hash table reaches a level of fullness then it will be resized. 
                                                    
    assert if the key is already in the hash.  */
 
@@ -193,7 +190,12 @@ compare_ptrs (const void *k1, const void
 static inline int 
 compare_strings (const void *k1, const void *k2)
 {
-  return !strcmp (k1, k2);
+  if (k1 == k2)
+    return 1;
+  else if (k1 == 0 || k2 == 0)
+    return 0;
+  else
+    return !strcmp (k1, k2);
 }