glcpp: Fix "dangerous trailing context" warning.

Flex couldn't be sure whether "def" and "ndef" were part of the #ifdef
and #ifndef patterns or the trailing context of the #if pattern.

diff --git a/glcpp/glcpp-lex.l b/glcpp/glcpp-lex.l
index fabe756..afddd7d 100644 (file)
--- a/glcpp/glcpp-lex.l
+++ b/glcpp/glcpp-lex.l
@@ -97,7 +97,7 @@ HEXADECIMAL_INTEGER   0[xX][0-9a-fA-F]+[uU]?
        return HASH_IFNDEF;
 }
 
-{HASH}if/.*\n {
+{HASH}if{HSPACE}/.*\n {
        yyextra->lexing_if = 1;
        yyextra->space_tokens = 0;
        return HASH_IF;