print-rtl.c (print_rtx_head): Constify.

        * print-rtl.c (print_rtx_head): Constify.
        * rtl.h (print_rtx_head): Similarly.

From-SVN: r36885

gcc/ChangeLog

 2000-10-16  Rodney Brown  <RodneyBrown@mynd.com>
 
+	* print-rtl.c (print_rtx_head): Constify.
+	* rtl.h (print_rtx_head): Similarly.
+
 	* config/pa/pa/pa-protos.h (output_64bit_and, output_64bit_ior):
 	Constify char * return value.
 	* config/pa/pa/pa.c

gcc/print-rtl.c

@@ -58,7 +58,7 @@ static void print_rtx		PARAMS ((rtx));
 /* String printed at beginning of each RTL when it is dumped.
    This string is set to ASM_COMMENT_START when the RTL is dumped in
    the assembly output file.  */
-char *print_rtx_head = "";
+const char *print_rtx_head = "";
 
 /* Nonzero means suppress output of instruction numbers and line number
    notes in debugging dumps.

gcc/rtl.h

@@ -1749,7 +1749,7 @@ extern void schedule_insns		PARAMS ((FILE *));
 extern void fix_sched_param		PARAMS ((const char *, const char *));
 
 /* In print-rtl.c */
-extern char *print_rtx_head;
+extern const char *print_rtx_head;
 extern void debug_rtx			PARAMS ((rtx));
 extern void debug_rtx_list		PARAMS ((rtx, int));
 extern void debug_rtx_range		PARAMS ((rtx, rtx));