GAS: Replace macro LITERAL_PREFIXDOLLAR_HEX with a runtime value.

In an upcoming commit, I need to be able to set the prefix used
to introduce hexadecimal literal constants using a command line
flag.   This is not currently possible, because the switch which
determines this (LITERAL_PREFIXDOLLAR_HEX) is a macro set at
build time.

This change substitutes it for a variable to be set at start up.

gas/ChangeLog:
* expr.c (literal_prefix_dollar_hex): New variable.
(operand)[case '$']: Use the new variable instead of the old macro.
* expr.h (literal_prefix_dollar_hex): Declare it.
* config/tc-epiphany.c (md_begin): Assign literal_prefix_dollar_hex.
* config/tc-ip2k.c:      ditto
* config/tc-mt.c:        ditto
* config/tc-epiphany.h (LITERAL_PREFIXDOLLAR_HEX): Remove macro definition.
* config/tc-ip2k.h:      ditto
* config/tc-mt.h:        ditto

1 files changed, 13 insertions, 6 deletions

diff --git a/gas/expr.c b/gas/expr.c
index 3efde88..0fab955 100644
--- a/gas/expr.c
+++ b/gas/expr.c
@@ -35,6 +35,8 @@
 #define CHAR_BIT 8
 #endif
 
+bfd_boolean literal_prefix_dollar_hex = FALSE;
+
 static void floating_constant (expressionS * expressionP);
 static valueT generic_bignum_to_int32 (void);
 #ifdef BFD64
@@ -778,14 +780,19 @@ operand (expressionS *expressionP, enum expr_mode mode)
 			expressionP);
       break;
 
-#ifdef LITERAL_PREFIXDOLLAR_HEX
     case '$':
-      /* $L is the start of a local label, not a hex constant.  */
-      if (* input_line_pointer == 'L')
-      goto isname;
-      integer_constant (16, expressionP);
+      if (literal_prefix_dollar_hex)
+        {
+          /* $L is the start of a local label, not a hex constant.  */
+          if (* input_line_pointer == 'L')
+            goto isname;
+          integer_constant (16, expressionP);
+        }
+      else
+        {
+          goto isname;
+        }
       break;
-#endif
 
 #ifdef LITERAL_PREFIXPERCENT_BIN
     case '%':