* Makefile.am: DJGPP specific files added to EXTRA_DIST.

[bison.git] / NEWS

diff --git a/NEWS b/NEWS
index 02b22d09646e2aeb3b1d056b23877f6e7bd390e1..a84a20ef7f491f3ee3c395588f1f68b64b44a260 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -1,7 +1,45 @@
 Bison News
 ----------
 
 Bison News
 ----------
 

-Changes in the next version (not yet released):
+Changes in version 2.1a:
+
+* GLR, C++ LALR(1) parsers.
+  These parser skeletons are now distributed with the same special
+  license exception that the C LALR(1) parser skeleton has had since
+  Bison 1.24.  Hence the FSF imposes no copyright restriction on the
+  output of Bison when it is generating such parsers.
+
+* %expect, %expect-rr
+  Incorrect numbers of expected conflicts are now actual errors,
+  instead of warnings.
+
+* GLR, YACC parsers.
+  The %parse-params are available in the %destructor's (and the
+  experimental %printer's) as per the documentation.
+
+* Bison now warns if it finds a stray `$' or `@' in an action.
+
+* %require "VERSION"
+  To specify that the grammar file depends on features implemented in
+  Bison version VERSION or higher.
+
+* lalr1.cc: The token and value types are now class members.
+  The tokens where defined as free form enums and cpp macros.  YYSTYPE
+  was defined as a free form union.  Both are now class members:
+  tokens are enumerations of the `yy::parser::token' struct, and the
+  semantic values have the `yy::parser::semantic_type' type.
+
+  If you do not want or can update to this scheme, the directive
+  `%define "global_tokens_and_yystype" "1"' triggers the global
+  definition of tokens and YYSTYPE.  This change is suitable both
+  for previous releases of Bison, and this one.
+
+  If you wish to update, then make sure older version of Bison will
+  fail using `%require "2.1a"'.
+
+* DJGPP support added.
+
+Changes in version 2.1, 2005-09-16:

 
 * Bison-generated parsers now support the translation of diagnostics like
   "syntax error" into languages other than English.  The default
 
 * Bison-generated parsers now support the translation of diagnostics like
   "syntax error" into languages other than English.  The default


@@ -10,7 +48,14 @@ Changes in the next version (not yet released):
   distributors should also see the new PACKAGING file.  Thanks to
   Bruno Haible for this new feature.
 
   distributors should also see the new PACKAGING file.  Thanks to
   Bruno Haible for this new feature.
 

-The following change was also in version 2.0a, 2005-05-22:
+* Wording in the Bison-generated parsers has been changed slightly to
+  simplify translation.  In particular, the message "memory exhausted"
+  has replaced "parser stack overflow", as the old message was not
+  always accurate for modern Bison-generated parsers.
+
+* Destructors are now called when the parser aborts, for all symbols left
+  behind on the stack.  Also, the start symbol is now destroyed after a
+  successful parse.  In both cases, the behavior was formerly inconsistent.

 
 * When generating verbose diagnostics, Bison-generated parsers no longer
   quote the literal strings associated with tokens.  For example, for
 
 * When generating verbose diagnostics, Bison-generated parsers no longer
   quote the literal strings associated with tokens.  For example, for


@@ -416,6 +461,8 @@ Changes in version 1.31, 2002-01-14:
   alloca is used only when compiled with GCC, to avoid portability
   problems as on AIX.
 
   alloca is used only when compiled with GCC, to avoid portability
   problems as on AIX.
 

+* yyparse now returns 2 if memory is exhausted; formerly it dumped core.
+

 * When the generated parser lacks debugging code, YYDEBUG is now 0
   (as POSIX requires) instead of being undefined.
 
 * When the generated parser lacks debugging code, YYDEBUG is now 0
   (as POSIX requires) instead of being undefined.