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[bison.git] / NEWS

diff --git a/NEWS b/NEWS
index 6123e57a797e8b411be059b3133bfec82ac05142..681a2bde89454ed0b2ce21bd4c3c670e615b8947 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -1,7 +1,45 @@
 Bison News
 ----------
 
 Bison News
 ----------
 

-Changes in version 1.49b:
+Changes in version 1.75a, 2002-10-24:
+
+* Bison can no longer be built by a K&R C compiler; it requires C89 or
+  later to be built.  This change originally took place a few versions
+  ago, but nobody noticed until we recently asked someone to try
+  building Bison with a K&R C compiler.
+
+Changes in version 1.75, 2002-10-14:
+
+* 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 parsing
   The declaration


@@ -11,25 +49,35 @@ Changes in version 1.49b:
   %dprec and %merge on grammar rules allow parse-time resolution of
   ambiguities.  Contributed by Paul Hilfinger.
 
   %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
 * Output Directory
   When not in Yacc compatibility mode, when the output file was not

-  specified, runnning `bison foo/bar.y' created `foo/bar.c'.  It
+  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
   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
 
 * 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
   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.
 
   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
 * 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


@@ -42,9 +90,11 @@ Changes in version 1.49b:
 * Traces
   Popped tokens and nonterminals are now reported.
 
 * 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
 
 * Explicit initial rule
   Bison used to play hacks with the initial rule, which the user does


@@ -84,7 +134,7 @@ 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
 * 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
   For instance
      %token YYEOF 0
   or


@@ -93,16 +143,17 @@ Changes in version 1.49b:
 * Semantic parser
   This old option, which has been broken for ages, is removed.
 
 * 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
   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.
 
 * 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
 
 * Reports
   In addition to --verbose, bison supports --report=THINGS, which


@@ -125,6 +176,8 @@ Changes in version 1.49b:
       bar: '0' {} '0';
 
   This is fixed.
       bar: '0' {} '0';
 
   This is fixed.

+
+* GNU M4 is now required when using Bison.

 \f
 Changes in version 1.35, 2002-03-25:
 
 \f
 Changes in version 1.35, 2002-03-25:
 


@@ -140,7 +193,6 @@ Changes in version 1.35, 2002-03-25:
 
   This kludge also addresses some C++ problems when the stack was
   extended.
 
   This kludge also addresses some C++ problems when the stack was
   extended.

-

 \f
 Changes in version 1.34, 2002-03-12:
 
 \f
 Changes in version 1.34, 2002-03-12: