(abitset_and, abitset_and_cmp, abitset_and_or,

[bison.git] / NEWS

diff --git a/NEWS b/NEWS
index 0dc405427086f70fc03682821e6d498b71747fe0..adba8cf9aa10378423bfd4dc19ac986acfd8be29 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -1,22 +1,76 @@
 Bison News
 ----------
 
-Changes in version 1.49b:
+Changes in version 1.75:
+
+* Bison should now work on 64-bit hosts.
+
+* Indonesian translation thanks to Tedi Heriyanto.
+
+* GLR parsers
+  Fix spurious parse errors.
+
+* Pure parsers
+  Some people redefine yyerror to steal yyparse' private variables.
+  Reenable this trick until an official feature replaces it.
+
+* Type Clashes
+  In agreement with POSIX and with other Yaccs, leaving a default
+  action is valid when $$ is untyped, and $1 typed:
+
+       untyped: ... typed;
+
+  but the converse remains an error:
+
+       typed: ... untyped;
+
+* Values of mid-rule actions
+  The following code:
+
+       foo: { ... } { $$ = $1; } ...
+
+  was incorrectly rejected: $1 is defined in the second mid-rule
+  action, and is equal to the $$ of the first mid-rule action.
+
+Changes in version 1.50, 2002-10-04:
+
+* GLR parsing
+  The declaration
+     %glr-parser
+  causes Bison to produce a Generalized LR (GLR) parser, capable of handling
+  almost any context-free grammar, ambiguous or not.  The new declarations
+  %dprec and %merge on grammar rules allow parse-time resolution of
+  ambiguities.  Contributed by Paul Hilfinger.
+
+  Unfortunately Bison 1.50 does not work properly on 64-bit hosts
+  like the Alpha, so please stick to 32-bit hosts for now.
+
+* Output Directory
+  When not in Yacc compatibility mode, when the output file was not
+  specified, running `bison foo/bar.y' created `foo/bar.c'.  It
+  now creates `bar.c'.
 
 * Undefined token
   The undefined token was systematically mapped to 2 which prevented
-  the use of 2 from the user.  This is no longer the case.
+  the use of 2 by the user.  This is no longer the case.
 
 * Unknown token numbers
-  If yylex returned a code out of range, yyparse could die.  This is
+  If yylex returned an out of range value, yyparse could die.  This is
   no longer the case.
 
 * Error token
-  According to POSIX, the error token should be numbered as 256.
+  According to POSIX, the error token must be 256.
   Bison extends this requirement by making it a preference: *if* the
   user specified that one of her tokens is numbered 256, then error
   will be mapped onto another number.
 
+* Verbose error messages
+  They no longer report `..., expecting error or...' for states where
+  error recovery is possible.
+
+* End token
+  Defaults to `$end' instead of `$'.
+
 * Error recovery now conforms to documentation and to POSIX
   When a Bison-generated parser encounters a syntax error, it now pops
   the stack until it finds a state that allows shifting the error
@@ -29,9 +83,11 @@ Changes in version 1.49b:
 * Traces
   Popped tokens and nonterminals are now reported.
 
-* Large grammars
-  Large grammars are now supported (large token numbers, large grammar
-  size (= sum of the LHS and RHS lengths), large LALR tables).
+* Larger grammars
+  Larger grammars are now supported (larger token numbers, larger grammar
+  size (= sum of the LHS and RHS lengths), larger LALR tables).
+  Formerly, many of these numbers ran afoul of 16-bit limits;
+  now these limits are 32 bits on most hosts.
 
 * Explicit initial rule
   Bison used to play hacks with the initial rule, which the user does
@@ -45,6 +101,10 @@ Changes in version 1.49b:
 * Useless rules, useless nonterminals
   They are now reported, as a warning, with their locations.
 
+* Rules never reduced
+  Rules that can never be reduced because of conflicts are now
+  reported.
+
 * Incorrect `Token not used'
   On a grammar such as
 
@@ -67,7 +127,7 @@ Changes in version 1.49b:
 * Token end-of-file
   The token end of file may be specified by the user, in which case,
   the user symbol is used in the reports, the graphs, and the verbose
-  error messages instead of `$', which remains being the defaults.
+  error messages instead of `$end', which remains being the default.
   For instance
      %token YYEOF 0
   or
@@ -76,16 +136,17 @@ Changes in version 1.49b:
 * Semantic parser
   This old option, which has been broken for ages, is removed.
 
-* New translation
+* New translations
+  Brazilian Portuguese, thanks to Alexandre Folle de Menezes.
   Croatian, thanks to Denis Lackovic.
 
 * Incorrect token definitions
-  When fed with `%token 'a' "A"', Bison used to output `#define 'a' 65'.
+  When given `%token 'a' "A"', Bison used to output `#define 'a' 65'.
 
 * Token definitions as enums
   Tokens are output both as the traditional #define's, and, provided
   the compiler supports ANSI C or is a C++ compiler, as enums.
-  This helps debuggers producing symbols instead of values.
+  This lets debuggers display names instead of integers.
 
 * Reports
   In addition to --verbose, bison supports --report=THINGS, which
@@ -108,6 +169,8 @@ Changes in version 1.49b:
       bar: '0' {} '0';
 
   This is fixed.
+
+* GNU M4 is now required when using Bison.
 \f
 Changes in version 1.35, 2002-03-25:
 
@@ -123,7 +186,6 @@ Changes in version 1.35, 2002-03-25:
 
   This kludge also addresses some C++ problems when the stack was
   extended.
-
 \f
 Changes in version 1.34, 2002-03-12: