New --yydebug option.

* parser.y (have_yydebug): New global constant.
(yydebug_onoff): New function.

* parser.h (have_yydebug, yydebug_onof): Declared.
(yydebug_onoff): New function.

* txr.c (help): List --yydebug option.
(txr_main): --yydebug option implemented.

1 files changed, 2 insertions, 0 deletions

diff --git a/parser.h b/parser.h
index 3e45e32d..9d4d857c 100644
--- a/parser.h
+++ b/parser.h
@@ -57,10 +57,12 @@ struct parser {
 
 enum prime_parser { prime_lisp, prime_regex };
 
+extern const int have_yydebug;
 extern const wchar_t *spec_file;
 extern val form_to_ln_hash;
 extern val parser_s;
 extern val unique_s;
+void yydebug_onoff(int);
 void yyerror(scanner_t *scanner, parser_t *, const char *s);
 void yyerr(scanner_t *scanner, const char *s);
 void yyerrorf(scanner_t *scanner, val s, ...);