warnings: used but undeclared symbols are warnings

[bison.git] / NEWS

diff --git a/NEWS b/NEWS
index 7b75972c4ace5457e59ee46acdc29c20c208ab9e..2b4ef26eeedcd22a3d89f1c4486cf9f764ffab4e 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -2,6 +2,18 @@ GNU Bison NEWS
 
 * Noteworthy changes in release ?.? (????-??-??) [?]
 
+** Warnings about undeclared symbols
+
+  Bison used to raise an error for %printer and %destructor directives for
+  undefined symbols.
+
+    %printer    {} symbol1
+    %destructor {} symbol2
+    %%
+    exp: "a";
+
+  This is now only a warning.
+
 ** Additional yylex/yyparse arguments
 
   The new directive %param declare additional argument to both yylex