cleanup FLT_CHARS and EXP_CHARS

Providing declarations in tc.h points out that alpha wasn't properly marking
FLT_CHARS as const.  We can also get rid of the confusing redefinition of
X_CHARS to mmix_x_chars.  Finally we can get rid of some now redundant
declarations of these constants.

gas/ChangeLog:

2016-04-03  Trevor Saunders  <tbsaunde+binutils@tbsaunde.org>

	* config/tc-alpha.c: Const qualify FLT_CHARS.
	* config/atof-ieee.c: Remove declarations of FLT_CHARS and EXP_CHARS.
	* config/tc-cris.h: Likewise.
	* expr.c: Likewise.
	* config/tc-mmix.c (md_atof): Adjust comment.
	* config/tc-mmix.h: Stop defining FLT_CHARS and EXP_CHARS as macros.
	* tc.h: Declare FLT_CHARS and EXP_CHARS.

1 files changed, 0 insertions, 2 deletions

diff --git a/gas/expr.c b/gas/expr.c
index 777504f..ddf0bc2 100644
--- a/gas/expr.c
+++ b/gas/expr.c
@@ -46,8 +46,6 @@ static void clean_up_expression (expressionS * expressionP);
 static segT operand (expressionS *, enum expr_mode);
 static operatorT operatorf (int *);
 
-extern const char EXP_CHARS[], FLT_CHARS[];
-
 /* We keep a mapping of expression symbols to file positions, so that
    we can provide better error messages.  */