* configure.in (AC_PROG_YACC): AC_DEFINE(OLD_YACC) if Yacc is found

  instead of Bison or byacc.

* parse.y: If OLD_YACC is defined, ensure that YYMAXDEPTH is at least
  10000 (Bison's default) since some old versions of Yacc define it as
  low as 150 by default, which is too low for Ruby to parse some files,
  such as date/format.rb.  Among other issues, the parse problem causes
  "make test" to fail.


git-svn-id: http://svn.ruby-lang.org/repos/ruby/trunk@5093 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 9 insertions, 0 deletions

diff --git a/parse.y b/parse.y
index 79bdc15db..a2c21aa25 100644
--- a/parse.y
+++ b/parse.y
@@ -177,6 +177,15 @@ static void top_local_setup();
 #define nd_paren(node) (char)((node)->u2.id >> CHAR_BIT*2)
 #define nd_nest u3.id
 
+/* Older versions of Yacc set YYMAXDEPTH to a very low value by default (150,
+   for instance).  This is too low for Ruby to parse some files, such as
+   date/format.rb, therefore bump the value up to at least Bison's default. */
+#ifdef OLD_YACC
+#ifndef YYMAXDEPTH
+#define YYMAXDEPTH 10000
+#endif
+#endif
+
 %}
 
 %union {