tree.c (build_common_tree_nodes): Initialize ptrdiff_type_node.

2016-11-26  Prathamesh Kulkarni  <prathamesh.kulkarni@linaro.org>

	* tree.c (build_common_tree_nodes): Initialize ptrdiff_type_node.
	(free_lang_data): Remove assignment to ptrdiff_type_node.
c-family/
	* c-common.c (c_common_nodes_and_builtins): Remove initialization of
	ptrdiff_type_node.
lto/
	* lto-lang.c (lto_init): Remove initialization of ptrdiff_type_node.

From-SVN: r242888

gcc/ChangeLog

+2016-11-26  Prathamesh Kulkarni  <prathamesh.kulkarni@linaro.org>
+
+	* tree.c (build_common_tree_nodes): Initialize ptrdiff_type_node.
+	(free_lang_data): Remove assignment to ptrdiff_type_node.
+
 2016-11-25  Jakub Jelinek  <jakub@redhat.com>
 
 	PR rtl-optimization/78526

gcc/c-family/ChangeLog

+2016-11-26  Prathamesh Kulkarni  <prathamesh.kulkarni@linaro.org>
+
+	* c-common.c (c_common_nodes_and_builtins): Remove initialization of
+	ptrdiff_type_node;
+
 2016-11-23  James Greenhalgh  <james.greenhalgh@arm.com>
 
 	* c-common.c (excess_precision_mode_join): New.

gcc/c-family/c-common.c

@@ -4475,8 +4475,6 @@ c_common_nodes_and_builtins (void)
 
   default_function_type
     = build_varargs_function_type_list (integer_type_node, NULL_TREE);
-  ptrdiff_type_node
-    = TREE_TYPE (identifier_global_value (get_identifier (PTRDIFF_TYPE)));
   unsigned_ptrdiff_type_node = c_common_unsigned_type (ptrdiff_type_node);
 
   lang_hooks.decls.pushdecl

gcc/lto/ChangeLog

+2016-11-26  Prathamesh Kulkarni  <prathamesh.kulkarni@linaro.org>
+
+	* lto-lang.c (lto_init): Remove initialization of ptrdiff_type_node.
+
 2016-11-23  Richard Biener  <rguenther@suse.de>
 
 	PR lto/78472

gcc/lto/lto-lang.c

@@ -1271,8 +1271,6 @@ lto_init (void)
   gcc_assert (TYPE_MAIN_VARIANT (const_tm_ptr_type_node)
 	      == const_ptr_type_node);
 
-  ptrdiff_type_node = integer_type_node;
-
   lto_build_c_type_nodes ();
   gcc_assert (va_list_type_node);
 

gcc/tree.c

@@ -6006,7 +6006,6 @@ free_lang_data (void)
   free_lang_data_in_cgraph ();
 
   /* Create gimple variants for common types.  */
-  ptrdiff_type_node = integer_type_node;
   fileptr_type_node = ptr_type_node;
   const_tm_ptr_type_node = const_ptr_type_node;
 
@@ -10314,6 +10313,30 @@ build_common_tree_nodes (bool signed_char)
 	gcc_unreachable ();
     }
 
+  /* Define what type to use for ptrdiff_t.  */
+  if (strcmp (PTRDIFF_TYPE, "int") == 0)
+    ptrdiff_type_node = integer_type_node;
+  else if (strcmp (PTRDIFF_TYPE, "long int") == 0)
+    ptrdiff_type_node = long_integer_type_node;
+  else if (strcmp (PTRDIFF_TYPE, "long long int") == 0)
+    ptrdiff_type_node = long_long_integer_type_node;
+  else if (strcmp (PTRDIFF_TYPE, "short int") == 0)
+    ptrdiff_type_node = short_integer_type_node;
+  else
+    {
+      ptrdiff_type_node = NULL_TREE;
+      for (int i = 0; i < NUM_INT_N_ENTS; i++)
+	if (int_n_enabled_p[i])
+	  {
+	    char name[50];
+	    sprintf (name, "__int%d", int_n_data[i].bitsize);
+	    if (strcmp (name, PTRDIFF_TYPE) == 0)
+	      ptrdiff_type_node = int_n_trees[i].signed_type;
+	  }
+      if (ptrdiff_type_node == NULL_TREE)
+	gcc_unreachable ();
+    }
+
   /* Fill in the rest of the sized types.  Reuse existing type nodes
      when possible.  */
   intQI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (QImode), 0);