[PATCH] make microblaze build with -Wwrite-strings

[tbsaunde+binutils@tbsaunde.org]

From: Trevor Saunders <tbsaunde+binutils@tbsaunde.org>

Hi,

frag_var () assigns its last argument to frag::fr_opcode, and it turns out
some targets modify the string that points to.  However it appears niether the
generic code or the microblaze code modifies what fr_opcode points to, so this
code should be safe.  So we unfortunately need to cast to char * when passing
an argument to frag_var () but otherwise microblaze can itself point to these
strings with const char *.

tested a cross to microblaze-elf still builds, ok?

Trev

gas/ChangeLog:

2016-03-22  Trevor Saunders  <tbsaunde+binutils@tbsaunde.org>

	* config/tc-microblaze.c (md_assemble): Cast opc to char * when calling
	frag_var ().
---
 gas/config/tc-microblaze.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/gas/config/tc-microblaze.c b/gas/config/tc-microblaze.c
index 70ceb21..0895ae9 100644
--- a/gas/config/tc-microblaze.c
+++ b/gas/config/tc-microblaze.c
@@ -840,8 +840,8 @@ parse_cons_expression_microblaze (expressionS *exp, int size)
    machine dependent instruction.  This function is supposed to emit
    the frags/bytes it assembles to.  */
 
-static char * str_microblaze_ro_anchor = "RO";
-static char * str_microblaze_rw_anchor = "RW";
+static const char * str_microblaze_ro_anchor = "RO";
+static const char * str_microblaze_rw_anchor = "RW";
 
 static bfd_boolean
 check_spl_reg (unsigned * reg)
@@ -1014,7 +1014,7 @@ md_assemble (char * str)
 
       if (exp.X_op != O_constant)
 	{
-          char *opc;
+          const char *opc;
 	  relax_substateT subtype;
 
           if (streq (name, "lmi"))
@@ -1039,7 +1039,7 @@ md_assemble (char * str)
 			     subtype,   /* PC-relative or not.  */
 			     exp.X_add_symbol,
 			     exp.X_add_number,
-			     opc);
+			     (char *) opc);
 	  immed = 0;
         }
       else
-- 
2.1.4