Add sane defaults for grep, egrep, fgrep and sed.

[bison.git] / NEWS

diff --git a/NEWS b/NEWS
index 784efeb7f389625a742ff18f44e00e102683c24a..4de67f10adceccd560b6d9499f275b2172ea48ad 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -1,11 +1,20 @@
 Bison News
 ----------
 
 Bison News
 ----------
 

-Changes in version 2.1a:
+Changes in version 2.1b:
+
+* %name-prefix changes the namespace name in C++ outputs.
+
+* The C++ parsers export their token_type.
+
+Changes in version 2.1a, 2006-02-13:
+
+* Bison now allows multiple %union declarations, and concatenates
+  their contents together.

 
 * New warning: unused values
 
 * New warning: unused values

-  Typed right-hand side symbols whose value are not used are reported.
-  For instance:
+  Right-hand side symbols whose values are not used are reported,
+  if the symbols have destructors.  For instance:

 
      exp: exp "?" exp ":" exp { $1 ? $1 : $3; }
        | exp "+" exp
 
      exp: exp "?" exp ":" exp { $1 ? $1 : $3; }
        | exp "+" exp


@@ -13,14 +22,17 @@ Changes in version 2.1a:
 
   will trigger a warning about $$ and $5 in the first rule, and $3 in
   the second ($1 is copied to $$ by the default rule).  This example
 
   will trigger a warning about $$ and $5 in the first rule, and $3 in
   the second ($1 is copied to $$ by the default rule).  This example

-  most likely contains three errors, and should be rewritten as:
+  most likely contains three errors, and could be rewritten as:

 
 

-     exp: exp "?" exp ":" exp { $$ = $1 ? $3 : $5; }
-       | exp "+" exp         { $$ = $1 + $3; }
+     exp: exp "?" exp ":" exp
+           { $$ = $1 ? $3 : $5; free ($1 ? $5 : $3); free ($1); }
+       | exp "+" exp
+           { $$ = $1 ? $1 : $3; if ($1) free ($3); }

        ;
 
        ;
 

-  However, if the original actions were really intended, the warnings
-  can be suppressed by letting Bison believe the values are used, e.g.:
+  However, if the original actions were really intended, memory leaks
+  and all, the warnings can be suppressed by letting Bison believe the
+  values are used, e.g.:

 
      exp: exp "?" exp ":" exp { $1 ? $1 : $3; (void) ($$, $5); }
        | exp "+" exp         { $$ = $1; (void) $3; }
 
      exp: exp "?" exp ":" exp { $1 ? $1 : $3; (void) ($$, $5); }
        | exp "+" exp         { $$ = $1; (void) $3; }


@@ -31,12 +43,6 @@ Changes in version 2.1a:
 
      exp: exp { push ($1); } '+' exp { push ($3); sum (); };
 
 
      exp: exp { push ($1); } '+' exp { push ($3); sum (); };
 

-  Mid-rule actions that use $$ cause the corresponding value to be
-  set, therefore the following action must use it.  The following rule
-  triggers a warning about $2.
-
-     exp: '1' { $$ = 1; } '+' exp { $$ = $1 + $4; };
-

   The warning is intended to help catching lost values and memory leaks.
   If a value is ignored, its associated memory typically is not reclaimed.
 
   The warning is intended to help catching lost values and memory leaks.
   If a value is ignored, its associated memory typically is not reclaimed.
 


@@ -50,14 +56,14 @@ Changes in version 2.1a:
   instead of warnings.
 
 * GLR, YACC parsers.
   instead of warnings.
 
 * GLR, YACC parsers.

-  The %parse-params are available in the %destructor's (and the
-  experimental %printer's) as per the documentation.
+  The %parse-params are available in the destructors (and the
+  experimental printers) as per the documentation.

 
 * Bison now warns if it finds a stray `$' or `@' in an action.
 
 * %require "VERSION"
 
 * 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.
+  This specifies 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 were defined as free form enums and cpp macros.  YYSTYPE
 
 * lalr1.cc: The token and value types are now class members.
   The tokens were defined as free form enums and cpp macros.  YYSTYPE


@@ -695,8 +701,8 @@ End:
 
 -----
 
 
 -----
 

-Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
-Free Software Foundation, Inc.
+Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
+2004, 2005, 2006 Free Software Foundation, Inc.

 
 This file is part of Bison, the GNU Compiler Compiler.
 
 
 This file is part of Bison, the GNU Compiler Compiler.