Warn about undefined preprocessor symbols at expansion time, not parse time

This means that we can do

	#if defined(TOKEN) && TOKEN > 1

and we will _not_ warn even with -Wundef, since the "TOKEN > 1" test
will never even be expanded if TOKEN isn't defined.

Al Viro gets credit for the algorithm changes, I just did the actual coding.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/token.h b/token.h
index eb0180b..bbf193c 100644
--- a/token.h
+++ b/token.h
@@ -60,6 +60,7 @@ enum token_type {
 	TOKEN_EOF,
 	TOKEN_ERROR,
 	TOKEN_IDENT,
+	TOKEN_ZERO_IDENT,
 	TOKEN_NUMBER,
 	TOKEN_CHAR,
 	TOKEN_STRING,