build: avoid concurrent extraction of calc++.

[bison.git] / NEWS

diff --git a/NEWS b/NEWS
index b3ba74fa814f6b5093e6961256544596c8e5abfc..7d401ad51049e2023459c8e59a583432f9e79b45 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -33,19 +33,26 @@ Bison News
   These features are experimental.  More user feedback will help to
   stabilize them.
 
+** Multiple %define's for any variable is now an error not a warning.
+
 ** %define can now be invoked via the command line.
 
-  Each of these bison command-line options
+  Each of these command-line options
+
+    -D NAME[=VALUE]
+    --define=NAME[=VALUE]
 
-    -D NAME=VALUE
-    --define=NAME=VALUE
+    -F NAME[=VALUE]
+    --force-define=NAME[=VALUE]
 
   is equivalent to this grammar file declaration
 
-    %define NAME "VALUE"
+    %define NAME ["VALUE"]
 
-  for any NAME and VALUE.  Omitting `=VALUE' on the command line is
-  equivalent to omitting `"VALUE"' in the declaration.
+  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.
 
 ** %define variables renamed.
 
@@ -62,6 +69,14 @@ Bison News
   The old names are now deprecated but will be maintained indefinitely
   for backward compatibility.
 
+** Symbols names
+
+  Consistently with directives (such as %error-verbose) and variables
+  (e.g. push-pull), symbol names may include dashes in any position,
+  similarly to periods and underscores.  This is GNU extension over
+  POSIX Yacc whose use is reported by -Wyacc, and rejected in Yacc
+  mode (--yacc).
+
 ** Temporary hack for adding a semicolon to the user action.
 
   Previously, Bison appended a semicolon to every user action for