* README: Mention m4 1.4.3. Remove obsolete advice about

[bison.git] / NEWS

diff --git a/NEWS b/NEWS
index 44b657902f92aa1dc90a806557361998154bcb59..05a472fa5854515587c5859e4db7b473c03a113e 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -1,73 +1,81 @@
 Bison News
 ----------
 
 Bison News
 ----------
 

-Changes in version 1.875f:
+Changes in version 2.0a, 2005-05-22:

 
 

-* Bison-generated parsers no longer default to using the alloca function
-  (when available) to extend the parser stack, due to widespread
-  problems in unchecked stack-overflow detection.  You can "#define
-  YYSTACK_USE_ALLOCA 1" to use alloca anyway, but please read the
-  manual to determine safe values for YYMAXDEPTH in that case.
+* Bison-generated C parsers use the _ macro to translate strings from
+  English to the user's language, e.g., _("syntax error").  By default,
+  _ is defined to be a no-op macro so the strings are not translated.

 
 

-Changes in version 1.875e, 2004-12-10:
+* When generating verbose diagnostics, Bison-generated C parsers no longer
+  quote the literal strings associated with tokens.  For example, for
+  a syntax error associated with '%token NUM "number"' they might
+  print 'syntax error, unexpected number' instead of 'syntax error,
+  unexpected "number"'.

 
 

-* New directive: %initial-action.
-  This directive allows the user to run arbitrary code (including
-  initializing @$) from yyparse before parsing starts.
+Changes in version 2.0, 2004-12-25:

 
 

-* The option `--report=lookahead' was changed to `--report=look-ahead'.
-  The old spelling still works, but is not documented and will be
-  removed.
+* Possibly-incompatible changes

 
 

-* Error token location.
-  During error recovery, the location of the syntax error is updated
-  to cover the whole sequence covered by the error token: it includes
-  the shifted symbols thrown away during the first part of the error
-  recovery, and the lookahead rejected during the second part.
+  - Bison-generated parsers no longer default to using the alloca function
+    (when available) to extend the parser stack, due to widespread
+    problems in unchecked stack-overflow detection.  You can "#define
+    YYSTACK_USE_ALLOCA 1" to require the use of alloca, but please read
+    the manual to determine safe values for YYMAXDEPTH in that case.

 
 

-* Goto numbers are no longer arbitrarily limited to 16-bit counts.
+  - Error token location.
+    During error recovery, the location of the syntax error is updated
+    to cover the whole sequence covered by the error token: it includes
+    the shifted symbols thrown away during the first part of the error
+    recovery, and the lookahead rejected during the second part.

 
 

-Changes in version 1.875d, 2004-05-21:
+  - Semicolon changes:
+    . Stray semicolons are no longer allowed at the start of a grammar.
+    . Semicolons are now required after in-grammar declarations.

 
 

-* Unescaped newlines are no longer allowed in character constants or
-  string literals.  They were never portable, and GCC 3.4.0 has
-  dropped support for them.  Better diagnostics are now generated if
-  forget a closing quote.
+  - Unescaped newlines are no longer allowed in character constants or
+    string literals.  They were never portable, and GCC 3.4.0 has
+    dropped support for them.  Better diagnostics are now generated if
+    forget a closing quote.

 
 

-* NUL bytes are no longer allowed in Bison string literals, unfortunately.
+  - NUL bytes are no longer allowed in Bison string literals, unfortunately.

 
 

-* %token numbers can now be hexadecimal integers, e.g., `%token FOO 0x12d'.
-  This is a GNU extension.
+* New features

 
 

-* A new directive "%expect-rr N" specifies the expected number of
-  reduce/reduce conflicts in GLR parsers.
+  - GLR grammars now support locations.

 
 

-* Experimental %destructor support has been added to lalr1.cc.
+  - New directive: %initial-action.
+    This directive allows the user to run arbitrary code (including
+    initializing @$) from yyparse before parsing starts.

 
 

-Changes in version 1.875c, 2003-08-25:
+  - A new directive "%expect-rr N" specifies the expected number of
+    reduce/reduce conflicts in GLR parsers.

 
 

-  (Just bug fixes.)
+  - %token numbers can now be hexadecimal integers, e.g., `%token FOO 0x12d'.
+    This is a GNU extension.

 
 

-Changes in version 1.875b, 2003-06-17:
+  - The option `--report=lookahead' was changed to `--report=look-ahead'.
+    The old spelling still works, but is not documented and will be
+    removed.

 
 

-* GLR grammars now support locations.
+  - Experimental %destructor support has been added to lalr1.cc.

 
 

-* Semicolon changes:
-  - Semicolons are now allowed before "|" in grammar rules, as POSIX requires.
-  - Stray semicolons are no longer allowed at the start of a grammar.
-  - Semicolons are now required after in-grammar declarations.
+  - New configure option --disable-yacc, to disable installation of the
+    yacc command and -ly library introduced in 1.875 for POSIX conformance.
+
+* Bug fixes

 
 

-Changes in version 1.875a, 2003-02-01:
+  - For now, %expect-count violations are now just warnings, not errors.
+    This is for compatibility with Bison 1.75 and earlier (when there are
+    reduce/reduce conflicts) and with Bison 1.30 and earlier (when there
+    are too many or too few shift/reduce conflicts).  However, in future
+    versions of Bison we plan to improve the %expect machinery so that
+    these violations will become errors again.

 
 

-* For now, %expect-count violations are now just warnings, not errors.
-  This is for compatibility with Bison 1.75 and earlier (when there are
-  reduce/reduce conflicts) and with Bison 1.30 and earlier (when there
-  are too many or too few shift/reduce conflicts).  However, in future
-  versions of Bison we plan to improve the %expect machinery so that
-  these violations will become errors again.
+  - Within Bison itself, numbers (e.g., goto numbers) are no longer
+    arbitrarily limited to 16-bit counts.

 
 

-* New configure option --disable-yacc, to disable installation of the
-  yacc command and -ly library introduced in 1.875 for POSIX conformance.
+  - Semicolons are now allowed before "|" in grammar rules, as POSIX requires.

 \f
 Changes in version 1.875, 2003-01-01:
 
 \f
 Changes in version 1.875, 2003-01-01:
 


@@ -597,7 +605,7 @@ End:
 
 -----
 
 
 -----
 

-Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
+Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005

 Free Software Foundation, Inc.
 
 This file is part of Bison, the GNU Compiler Compiler.
 Free Software Foundation, Inc.
 
 This file is part of Bison, the GNU Compiler Compiler.


@@ -614,5 +622,5 @@ GNU General Public License for more details.
 
 You should have received a copy of the GNU General Public License
 along with autoconf; see the file COPYING.  If not, write to
 
 You should have received a copy of the GNU General Public License
 along with autoconf; see the file COPYING.  If not, write to

-the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA.
+the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+Boston, MA 02110-1301, USA.