c-pragma.h (HANDLE_PRAGMA_WEAK): Define iff ASM_WEAKEN_LABEL and ASM_OUTPUT_WEAK_ALIAS are defined.

	* c-pragma.h (HANDLE_PRAGMA_WEAK): Define iff ASM_WEAKEN_LABEL and
	ASM_OUTPUT_WEAK_ALIAS are defined.
	* defaults.h (ASM_OUTPUT_WEAK_ALIAS): Define if possible.
	* config/mips/iris6.h (ASM_OUTPUT_WEAK_ALIAS, ASM_WEAKEN_LABEL):
	Moved ...
	* config/mips/iris5.h: ... here.
	(HANDLE_SYSV_PRAGMA): Defined as 1.
	* varasm.c (weak_finish): Use ASM_OUTPUT_WEAK_ALIAS.
	* doc/tm.texi (ASM_OUTPUT_WEAK_ALIAS): Support the undefined weak
	symbol.

Co-Authored-By: Rainer Orth <ro@TechFak.Uni-Bielefeld.DE>

From-SVN: r44072

gcc/ChangeLog

+2001-07-17  H.J. Lu <hjl@gnu.org>
+	    Rainer Orth <ro@TechFak.Uni-Bielefeld.DE>
+
+	* c-pragma.h (HANDLE_PRAGMA_WEAK): Define iff ASM_WEAKEN_LABEL and
+	ASM_OUTPUT_WEAK_ALIAS are defined.
+	* defaults.h (ASM_OUTPUT_WEAK_ALIAS): Define if possible.
+	* config/mips/iris6.h (ASM_OUTPUT_WEAK_ALIAS, ASM_WEAKEN_LABEL):
+	Moved ...
+	* config/mips/iris5.h: ... here.
+	(HANDLE_SYSV_PRAGMA): Defined as 1.
+	* varasm.c (weak_finish): Use ASM_OUTPUT_WEAK_ALIAS.
+	* doc/tm.texi (ASM_OUTPUT_WEAK_ALIAS): Support the undefined weak
+	symbol.
+
 2001-07-17  Joseph S. Myers  <jsm28@cam.ac.uk>
 
 	* c-parse.in (all_prefix_attributes): New variable.

gcc/c-pragma.h

 /* Pragma related interfaces.
-   Copyright (C) 1995, 1998, 1999, 2000 Free Software Foundation, Inc.
+   Copyright (C) 1995, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
 
 This file is part of GNU CC.
 
@@ -22,9 +22,9 @@ Boston, MA 02111-1307, USA.  */
 #define GCC_C_PRAGMA_H
 
 #ifdef HANDLE_SYSV_PRAGMA
-/* Support #pragma weak iff ASM_WEAKEN_LABEL and ASM_OUTPUT_DEF are
+/* Support #pragma weak iff ASM_WEAKEN_LABEL and ASM_OUTPUT_WEAK_ALIAS are
    defined.  */
-#if defined (ASM_WEAKEN_LABEL) && defined (ASM_OUTPUT_DEF)
+#if defined (ASM_WEAKEN_LABEL) && defined (ASM_OUTPUT_WEAK_ALIAS)
 #define HANDLE_PRAGMA_WEAK SUPPORTS_WEAK
 #endif
 

gcc/config/mips/iris5.h

@@ -170,3 +170,26 @@ do {							\
   tree name_tree = get_identifier (NAME);		\
   TREE_ASM_WRITTEN (name_tree) = 1;			\
 } while (0)
+
+/* This is how we tell the assembler that a symbol is weak.  */
+
+#define ASM_OUTPUT_WEAK_ALIAS(FILE, NAME, VALUE)	\
+  do							\
+    {							\
+      ASM_GLOBALIZE_LABEL (FILE, NAME);			\
+      fputs ("\t.weakext\t", FILE);			\
+      assemble_name (FILE, NAME);			\
+      if (VALUE)					\
+        {						\
+          fputc (' ', FILE);				\
+          assemble_name (FILE, VALUE);			\
+        }						\
+      fputc ('\n', FILE);				\
+    }							\
+  while (0)
+
+#define ASM_WEAKEN_LABEL(FILE, NAME) ASM_OUTPUT_WEAK_ALIAS(FILE, NAME, 0)
+
+/* Handle #pragma weak and #pragma pack.  */
+#undef HANDLE_SYSV_PRAGMA
+#define HANDLE_SYSV_PRAGMA 1

gcc/config/mips/iris6.h

@@ -207,23 +207,6 @@ Boston, MA 02111-1307, USA.  */
 #define TYPE_ASM_OP	"\t.type\t"
 #define SIZE_ASM_OP	"\t.size\t"
 
-/* This is how we tell the assembler that a symbol is weak.  */
-
-#define ASM_OUTPUT_WEAK_ALIAS(FILE,NAME,VALUE)	\
- do {						\
-  ASM_GLOBALIZE_LABEL (FILE, NAME);		\
-  fputs ("\t.weakext\t", FILE);			\
-  assemble_name (FILE, NAME);			\
-  if (VALUE)					\
-    {						\
-      fputc (' ', FILE);			\
-      assemble_name (FILE, VALUE);		\
-    }						\
-  fputc ('\n', FILE);				\
- } while (0)
-
-#define ASM_WEAKEN_LABEL(FILE,NAME) ASM_OUTPUT_WEAK_ALIAS(FILE,NAME,0)
-
 /* Irix assembler does not support the init_priority C++ attribute.  */
 #undef SUPPORTS_INIT_PRIORITY
 #define SUPPORTS_INIT_PRIORITY 0

gcc/defaults.h

@@ -142,6 +142,18 @@ do { ASM_OUTPUT_LABEL(FILE,LABEL_ALTERNATE_NAME (INSN)); } while (0)
   ASM_OUTPUT_INTERNAL_LABEL (FILE, PREFIX, NUM)
 #endif
 
+/* This is how we tell the assembler that a symbol is weak.  */
+#if !defined (ASM_OUTPUT_WEAK_ALIAS) && defined (ASM_OUTPUT_DEF)
+#define ASM_OUTPUT_WEAK_ALIAS(STREAM, NAME, VALUE)	\
+  do							\
+    {							\
+      ASM_WEAKEN_LABEL (STREAM, NAME);			\
+      if (VALUE)					\
+        ASM_OUTPUT_DEF (STREAM, NAME, VALUE);		\
+    }							\
+  while (0)
+#endif
+
 /* This determines whether or not we support weak symbols.  */
 #ifndef SUPPORTS_WEAK
 #ifdef ASM_WEAKEN_LABEL

gcc/doc/tm.texi

@@ -6423,7 +6423,8 @@ correct for most systems.
 @item ASM_OUTPUT_WEAK_ALIAS (@var{stream}, @var{name}, @var{value})
 A C statement to output to the stdio stream @var{stream} assembler code
 which defines (equates) the weak symbol @var{name} to have the value
-@var{value}.
+@var{value}.  If @var{value} is @code{NULL}, it defines @var{name} as
+an undefined weak symbol.
 
 Define this macro if the target only supports weak aliases; define
 @code{ASM_OUTPUT_DEF} instead if possible.

gcc/varasm.c

@@ -4773,11 +4773,7 @@ weak_finish ()
       for (t = weak_decls; t; t = t->next)
 	{
 	  if (t->name)
-	    {
-	      ASM_WEAKEN_LABEL (asm_out_file, t->name);
-	      if (t->value)
-		ASM_OUTPUT_DEF (asm_out_file, t->name, t->value);
-	    }
+	    ASM_OUTPUT_WEAK_ALIAS (asm_out_file, t->name, t->value);
 	}
     }
 #endif