objc-act.c (handle_class_ref): Rewrite to flush target specific code and use new macro...

        * objc/objc-act.c (handle_class_ref): Rewrite to flush target
        specific code and use new macro ASM_DECLARE_UNRESOLVED_REFERENCE.
        * config/darwin.h (ASM_DECLARE_UNRESOLVED_REFERENCE): Define.
        * tm.texi (ASM_DECLARE_UNRESOLVED_REFERENCE): Document.

From-SVN: r41666

gcc/ChangeLog

 2001-04-28  Stan Shebs  <shebs@apple.com>
 
+	* objc/objc-act.c (handle_class_ref): Rewrite to flush target
+	specific code and use new macro ASM_DECLARE_UNRESOLVED_REFERENCE.
+	* config/darwin.h (ASM_DECLARE_UNRESOLVED_REFERENCE): Define.
+	* tm.texi (ASM_DECLARE_UNRESOLVED_REFERENCE): Document.
+
 	* config/darwin.h (STANDARD_EXEC_PREFIX): Don't define.
 	(NEXT_OBJC_RUNTIME): Define.
 	

gcc/config/darwin.h

@@ -648,15 +648,15 @@ void alias_section (name, alias)			\
     }									\
   while (0)
 
-#define DECLARE_UNRESOLVED_REFERENCE(NAME)				\
-    do { extern FILE* asm_out_file; 					\
-	 if (asm_out_file) {						\
+#define ASM_DECLARE_UNRESOLVED_REFERENCE(FILE,NAME)			\
+    do { 								\
+	 if (FILE) {							\
 	   if (flag_pic)						\
-	     fprintf (asm_out_file, "\t.lazy_reference ");		\
+	     fprintf (FILE, "\t.lazy_reference ");			\
 	   else								\
-	     fprintf (asm_out_file, "\t.reference ");			\
-	   assemble_name (asm_out_file, NAME);				\
-	   fprintf (asm_out_file, "\n");				\
+	     fprintf (FILE, "\t.reference ");				\
+	   assemble_name (FILE, NAME);					\
+	   fprintf (FILE, "\n");					\
 	 }                                                              \
        } while (0)
 

gcc/objc/objc-act.c

@@ -8355,46 +8355,43 @@ handle_class_ref (chain)
      tree chain;
 {
   const char *name = IDENTIFIER_POINTER (TREE_VALUE (chain));
-  if (! flag_next_runtime)
-    {
-      tree decl;
-      char *string = (char *) alloca (strlen (name) + 30);
-      tree exp;
+  char *string = (char *) alloca (strlen (name) + 30);
+  tree decl;
+  tree exp;
 
-      sprintf (string, "%sobjc_class_name_%s",
-	       (flag_next_runtime ? "." : "__"), name);
+  sprintf (string, "%sobjc_class_name_%s",
+	   (flag_next_runtime ? "." : "__"), name);
 
-      /* Make a decl for this name, so we can use its address in a tree.  */
-      decl = build_decl (VAR_DECL, get_identifier (string), char_type_node);
-      DECL_EXTERNAL (decl) = 1;
-      TREE_PUBLIC (decl) = 1;
+#ifdef ASM_DECLARE_UNRESOLVED_REFERENCE
+  if (flag_next_runtime)
+    {
+      ASM_DECLARE_UNRESOLVED_REFERENCE (asm_out_file, string);
+      return;
+    }
+#endif
 
-      pushdecl (decl);
-      rest_of_decl_compilation (decl, 0, 0, 0);
+  /* Make a decl for this name, so we can use its address in a tree.  */
+  decl = build_decl (VAR_DECL, get_identifier (string), char_type_node);
+  DECL_EXTERNAL (decl) = 1;
+  TREE_PUBLIC (decl) = 1;
+
+  pushdecl (decl);
+  rest_of_decl_compilation (decl, 0, 0, 0);
 
-      /* Make following constant read-only (why not)?  */
-      readonly_data_section ();
+  /* Make following constant read-only, but only for GNU runtime.  */
+  if (!flag_next_runtime)
+    readonly_data_section ();
 
-      exp = build1 (ADDR_EXPR, string_type_node, decl);
+  exp = build1 (ADDR_EXPR, string_type_node, decl);
 
-      /* Align the section properly.  */
-      assemble_constant_align (exp);
+  /* Align the section properly.  */
+  assemble_constant_align (exp);
 
-      /* Inform the assembler about this new external thing.  */
-      assemble_external (decl);
+  /* Inform the assembler about this new external thing.  */
+  assemble_external (decl);
 
-      /* Output a constant to reference this address.  */
-      output_constant (exp, int_size_in_bytes (string_type_node));
-    }
-  else
-    {
-      /* This overreliance on our assembler (i.e. lack of portability)
-	 should be dealt with at some point.  The GNU strategy (above)
-	 won't work either, but it is a start.  */
-      char *string = (char *) alloca (strlen (name) + 30);
-      sprintf (string, ".reference .objc_class_name_%s", name);
-      assemble_asm (my_build_string (strlen (string) + 1, string));
-    }
+  /* Output a constant to reference this address.  */
+  output_constant (exp, int_size_in_bytes (string_type_node));
 }
 
 static void

gcc/tm.texi

@@ -6270,6 +6270,13 @@ in a category); and @var{sel_name} is the name of the selector.
 
 On systems where the assembler can handle quoted names, you can use this
 macro to provide more human-readable names.
+
+@findex ASM_DECLARE_UNRESOLVED_REFERENCE
+@item ASM_DECLARE_UNRESOLVED_REFERENCE (@var{stream}, @var{name})
+A C statement (sans semicolon) to output to the stdio stream
+@var{stream} commands to declare that the label @var{name} is an
+unresolved Objective-C class reference.  This is only needed for targets
+whose linkers have special support for NeXT-style runtimes.
 @end table
 
 @node Initialization