rs6000.h (ASM_OUTPUT_DEF_FROM_DECLS): Handle DECL_WEAK for function descriptors.

        * config/rs6000/rs6000.h (ASM_OUTPUT_DEF_FROM_DECLS): Handle
        DECL_WEAK for function descriptors.
        * config/rs6000/xcoff.h (HANDLE_PRAGMA_WEAK): Define if assembler
        weak support present.
        (ASM_WEAKEN_LABEL): Same.

From-SVN: r48027

gcc/ChangeLog

+2001-12-14  David Edelsohn  <edelsohn@gnu.org>
+
+	* config/rs6000/rs6000.h (ASM_OUTPUT_DEF_FROM_DECLS): Handle
+	DECL_WEAK for function descriptors.
+	* config/rs6000/xcoff.h (HANDLE_PRAGMA_WEAK): Define if assembler
+	weak support present.
+	(ASM_WEAKEN_LABEL): Same.
+
 2001-12-14  Kazu Hirata  <kazu@hxi.com>
 
 	* config/h8300/h8300.md (anonymous pattern): Add a missing

gcc/config/rs6000/rs6000.h

@@ -2469,8 +2469,13 @@ extern int toc_initialized;
     }									  \
 }
 
-/* This implementes the `alias' attribute.  */
+#ifdef HAVE_GAS_WEAK
+#define RS6000_WEAK 1
+#else
+#define RS6000_WEAK 0
+#endif
 
+/* This implementes the `alias' attribute.  */
 #define ASM_OUTPUT_DEF_FROM_DECLS(FILE,decl,target)	\
 do {							\
   const char * alias = XSTR (XEXP (DECL_RTL (decl), 0), 0); \
@@ -2480,9 +2485,18 @@ do {							\
     {							\
       if (TREE_PUBLIC (decl))				\
 	{						\
-	  fputs ("\t.globl .", FILE);			\
-	  assemble_name (FILE, alias);			\
-	  putc ('\n', FILE);				\
+	  if (RS6000_WEAK && DECL_WEAK (decl))		\
+	    {						\
+	      fputs ("\t.weak .", FILE);		\
+	      assemble_name (FILE, alias);		\
+	      putc ('\n', FILE);			\
+	    }						\
+	  else						\
+	    {						\
+	      fputs ("\t.globl .", FILE);		\
+	      assemble_name (FILE, alias);		\
+	      putc ('\n', FILE);			\
+	    }						\
 	}						\
       else						\
 	{						\

gcc/config/rs6000/xcoff.h

@@ -438,9 +438,6 @@ toc_section ()						\
 	 fprintf ((FILE), ",%d\n", (SIZE));		\
   } while (0)
 
-/* Used by definition of ASM_OUTPUT_DOUBLE_INT */
-#define DOUBLE_INT_ASM_OP "\t.llong "
-
 /* This says how to output an assembler line
    to define a local common symbol.
    Alignment cannot be specified, but we can try to maintain
@@ -454,9 +451,25 @@ toc_section ()						\
 		xcoff_bss_section_name);		\
      } while (0)
 
+/* Output a weak symbol, if weak support present.  */
+#ifdef HAVE_GAS_WEAK
+#define HANDLE_PRAGMA_WEAK 1
+
+#define ASM_WEAKEN_LABEL(FILE, NAME)	\
+  do					\
+    {					\
+      fputs ("\t.weak ", (FILE));	\
+      assemble_name ((FILE), (NAME));	\
+      fputc ('\n', (FILE));		\
+    }					\
+  while (0)
+#endif /* HAVE_GAS_WEAK */
+
 /* This is how we tell the assembler that two symbols have the same value.  */
+#define SET_ASM_OP "\t.set "
 
-#define SET_ASM_OP "\t.set\t"
+/* Used by definition of ASM_OUTPUT_DOUBLE_INT */
+#define DOUBLE_INT_ASM_OP "\t.llong "
 
 /* These are various definitions for DWARF output.  They could just
    use '.long' or '.word', but that aligns to a 4-byte boundary which