[PATCH RFC 08/13] expression: recognize references to labels as address constants

[Nicolai Stange <nicstange@gmail.com>]

As an extension, GCC allows labels to be referenced a la
  label1:
  ...

  void *ptr = &&label1;

Tag these label references as being address constants allowing them
to be used as initializers for objects of static storage duration.

Signed-off-by: Nicolai Stange <nicstange@gmail.com>
---
 expression.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/expression.c b/expression.c
index 4d5edc8..19786e8 100644
--- a/expression.c
+++ b/expression.c
@@ -684,6 +684,8 @@ static struct token *unary_expression(struct token *token, struct expression **t
 				sym->ctype.modifiers |= MOD_ADDRESSABLE;
 				add_symbol(&function_computed_target_list, sym);
 			}
+			label->flags |=
+				expr_set_flag_mask(EXPR_FLAG_ADDR_CONST_EXPR);
 			label->label_symbol = sym;
 			*tree = label;
 			return token->next->next;
-- 
2.4.5