Implement #undef.
Which is as simple as copying the former action back from the git
history.
Now all tests through test 11 pass.
diff --git a/glcpp-parse.y b/glcpp-parse.y
index b3ef177..830a623 100644
--- a/glcpp-parse.y
+++ b/glcpp-parse.y
@@ -171,7 +171,17 @@
}
| HASH_DEFINE_FUNC IDENTIFIER '(' ')' replacement_list NEWLINE
| HASH_DEFINE_FUNC IDENTIFIER '(' identifier_list ')' replacement_list NEWLINE
-| HASH_UNDEF IDENTIFIER NEWLINE
+| HASH_UNDEF IDENTIFIER NEWLINE {
+ string_list_t *macro = hash_table_find (parser->defines, $2);
+ if (macro) {
+ /* XXX: Need hash table to support a real way
+ * to remove an element rather than prefixing
+ * a new node with data of NULL like this. */
+ hash_table_insert (parser->defines, NULL, $2);
+ talloc_free (macro);
+ }
+ talloc_free ($2);
+ }
| HASH NEWLINE
;