Fix portability problem on OpenBSD 4.7.

[bison.git] / NEWS

diff --git a/NEWS b/NEWS
index e5ebfe4bca11d54bbd8286fdc428211111340b1d..177fbbb6288798c30e1190d0bbd2807710892929 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -51,6 +51,15 @@ Bison News
   use of the %error-verbose directive is deprecated in favor of
   %define parse.error "verbose".
 
   use of the %error-verbose directive is deprecated in favor of
   %define parse.error "verbose".
 

+** Semantic predicates
+
+  The new, experimental, semantic-predicate feature allows actions of
+  the form %?{ BOOLEAN-EXPRESSION }, which cause syntax errors (as for
+  YYERROR) if the expression evaluates to 0, and are evaluated immediately
+  in GLR parsers, rather than being deferred.  The result is that they
+  allow the programmer to prune possible parses based on the values of
+  runtime expressions.
+

 * Changes in version 2.5 (????-??-??):
 
 ** Named References Support
 * Changes in version 2.5 (????-??-??):
 
 ** Named References Support


@@ -272,7 +281,10 @@ Bison News
   the user %code sections so that its #ifndef guard does not try to
   override the user's YYLLOC_DEFAULT if provided.
 
   the user %code sections so that its #ifndef guard does not try to
   override the user's YYLLOC_DEFAULT if provided.
 

-* Changes in version 2.4.3 (????-??-??):
+* Changes in version 2.4.3 (2010-08-05):
+
+** Bison now obeys -Werror and --warnings=error for warnings about
+   grammar rules that are useless in the parser due to conflicts.

 
 ** Problems with spawning M4 on at least FreeBSD 8 and FreeBSD 9 have
    been fixed.
 
 ** Problems with spawning M4 on at least FreeBSD 8 and FreeBSD 9 have
    been fixed.


@@ -287,6 +299,8 @@ Bison News
    errors in Bison 2.5.  They will remain warnings, which should be
    sufficient for POSIX while avoiding backward compatibility issues.
 
    errors in Bison 2.5.  They will remain warnings, which should be
    sufficient for POSIX while avoiding backward compatibility issues.
 

+** Minor documentation fixes.
+

 * Changes in version 2.4.2 (2010-03-20):
 
 ** Some portability problems that resulted in failures and livelocks
 * Changes in version 2.4.2 (2010-03-20):
 
 ** Some portability problems that resulted in failures and livelocks