gas: apply md_register_arithmetic also to unary '+'

Even a unary '+' has to be considered arithmetic; at least on x86 in
Intel Syntax mode otherwise bogus insn operands may be accepted.
Convert this specific case to binary + (i.e. 0 + <register>). (An
implication is that md_operator(,1,) would need to deal with arch-
specific equivalents of unary '+' is a similar way, if such an arch-
specific variant would be specified in the first place.)

To avoid duplicating what make_expr_symbol() does to construct a
constant-zero expression, simply make its previously local variable a
file-scope static one. This way there's also no need to invoke
clean_up_expression().

1 files changed, 1 insertions, 1 deletions

diff --git a/gas/expr.h b/gas/expr.h
index 8de272f..52574bd 100644
--- a/gas/expr.h
+++ b/gas/expr.h
@@ -182,7 +182,7 @@ extern void add_to_result (expressionS *, offsetT, int);
 extern void subtract_from_result (expressionS *, offsetT, int);
 extern segT expr (int, expressionS *, enum expr_mode);
 extern unsigned int get_single_number (void);
-extern symbolS *make_expr_symbol (expressionS * expressionP);
+extern symbolS *make_expr_symbol (const expressionS * expressionP);
 extern int expr_symbol_where (symbolS *, const char **, unsigned int *);
 extern void current_location (expressionS *);
 extern symbolS *expr_build_uconstant (offsetT);