extern segT expr (int, expressionS *, enum expr_mode);
extern unsigned int get_single_number (void);
extern symbolS *make_expr_symbol (expressionS * expressionP);
-extern int expr_symbol_where (symbolS *, char **, unsigned int *);
+extern int expr_symbol_where (symbolS *, const char **, unsigned int *);
extern void current_location (expressionS *);
extern symbolS *expr_build_uconstant (offsetT);