X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/4c2a6e42ba8b6bc4e04985f5ef3ec8926048d4b1..ac3297d501e9b74a11095d966bb8e5aa6fcf0ff4:/NEWS

diff --git a/NEWS b/NEWS
index 3f102577..1b70a6ad 100644
--- a/NEWS
+++ b/NEWS
@@ -21,12 +21,12 @@ Bison News
   When no ambiguity is possible, original symbol names may be used
   as named references:
 
-    if_stmt : 'if' cond_expr 'then' then_stmt ';'
+    if_stmt : "if" cond_expr "then" then_stmt ';'
     { $if_stmt = mk_if_stmt($cond_expr, $then_stmt); }
 
   In the more common case, explicit names may be declared:
 
-    stmt[res] : 'if' expr[cond] 'then' stmt[then] 'else' stmt[else] ';'
+    stmt[res] : "if" expr[cond] "then" stmt[then] "else" stmt[else] ';'
     { $res = mk_if_stmt($cond, $then, $else); }
 
   Location information is also accessible using @name syntax.  When
@@ -125,7 +125,7 @@ Bison News
   except that the manner in which Bison processes multiple definitions
   for the same NAME differs.  Most importantly, -F and --force-define
   quietly override %define, but -D and --define do not.  For further
-  details, see the section "Bison Options" in the Bison manual.
+  details, see the section `Bison Options' in the Bison manual.
 
 *** Variables renamed:
 
@@ -183,8 +183,8 @@ Bison News
 
   Similarly to the C parsers, the C++ parsers now define the YYRHSLOC
   macro and use it in the default YYLLOC_DEFAULT.  You are encouraged
-  to use it.  If, for instance, your location structure has "first"
-  and "last" members, instead of
+  to use it.  If, for instance, your location structure has `first'
+  and `last' members, instead of
 
       # define YYLLOC_DEFAULT(Current, Rhs, N)                             \
         do                                                                 \
@@ -266,7 +266,7 @@ Bison News
     in order to detect a syntax error.  Because no unexpected token or
     expected tokens can then be reported, the verbose syntax error
     message described above is suppressed, and the parser instead
-    reports the simpler message, "syntax error".  Previously, this
+    reports the simpler message, `syntax error'.  Previously, this
     suppression was sometimes erroneously triggered by %nonassoc when a
     lookahead was actually required.  Now verbose messages are
     suppressed only when all previous lookaheads have already been
@@ -298,6 +298,51 @@ Bison News
 *** The top element of each of the value stack and location stack is now
     cleared when popped so that it can be garbage collected.
 
+*** Parser traces now print the top element of the stack.
+
+** -W/--warnings fixes:
+
+*** Bison now properly recognizes the `no-' versions of categories:
+
+  For example, given the following command line, Bison now enables all
+  warnings except warnings for incompatibilities with POSIX Yacc:
+
+    bison -Wall,no-yacc gram.y
+
+*** Bison now treats S/R and R/R conflicts like other warnings:
+
+  Previously, conflict reports were independent of Bison's normal
+  warning system.  Now, Bison recognizes the warning categories
+  `conflicts-sr' and `conflicts-rr'.  This change has important
+  consequences for the -W and --warnings command-line options.  For
+  example:
+
+    bison -Wno-conflicts-sr gram.y  # S/R conflicts not reported
+    bison -Wno-conflicts-rr gram.y  # R/R conflicts not reported
+    bison -Wnone            gram.y  # no conflicts are reported
+    bison -Werror           gram.y  # any conflict is an error
+
+  However, as before, if the %expect or %expect-rr directive is
+  specified, an unexpected number of conflicts is an error, and an
+  expected number of conflicts is not reported, so -W and --warning
+  then have no effect on the conflict report.
+
+*** The `none' category no longer disables a preceding `error':
+
+  For example, for the following command line, Bison now reports
+  errors instead of warnings for incompatibilities with POSIX Yacc:
+
+    bison -Werror,none,yacc gram.y
+
+*** The `none' category now disables all Bison warnings.
+
+  Previously, the `none' category disabled only Bison warnings for
+  which there existed a specific -W/--warning category.  However,
+  given the following command line, Bison is now guaranteed to
+  suppress all warnings:
+
+    bison -Wnone gram.y
+
 * Changes in version 2.4.3 (2010-08-05):
 
 ** Bison now obeys -Werror and --warnings=error for warnings about