fix 'weak' attribute loss

When NS_MACRO symbol is used, sparse clears it's 'weak' flag.
This is bad for multifile parsing, and wrong:

	#weak_define FOO 1
	FOO
	#weak_define FOO 2	// silently ignored

After this patch sparse never writes to NS_MACRO symbols from
another scope (except ->used_in).

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>

1 files changed, 1 insertions, 0 deletions

diff --git a/symbol.h b/symbol.h
index e3b6b45..498e6e3 100644
--- a/symbol.h
+++ b/symbol.h
@@ -99,6 +99,7 @@ struct symbol {
 		struct /* NS_MACRO */ {
 			struct token *expansion;
 			struct token *arglist;
+			struct scope *used_in;
 		};
 		struct /* NS_PREPROCESSOR */ {
 			int (*handler)(struct stream *, struct token **, struct token *);