graphs: minor style changes

[bison.git] / NEWS

diff --git a/NEWS b/NEWS
index 81afe649c4691761f9958c65f9e09e2883d47dcd..a20898fc32eef65c5c0c57cedd6ee2472748f2fa 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -48,6 +48,38 @@ GNU Bison NEWS
   This feature is somewhat experimental.  User feedback would be
   appreciated.
 
+** Fix compiler warnings in the generated parser (yacc.c, glr.c)
+
+  The compilation of pure parsers (%define api.pure) can trigger GCC
+  warnings such as:
+
+    input.c: In function 'yyparse':
+    input.c:1503:12: warning: 'yylval' may be used uninitialized in this
+                              function [-Wmaybe-uninitialized]
+       *++yyvsp = yylval;
+                ^
+
+  This is now fixed; pragmas to avoid these warnings are no longer needed.
+
+  Warnings from clang ("equality comparison with extraneous parentheses" and
+  "function declared 'noreturn' should not return") have also been
+  addressed.
+
+** New %define variable: api.location.type (glr.cc, lalr1.cc)
+
+  The %define variable api.location.type defines the name of the type to use
+  for locations.  When defined, Bison no longer generates the position.hh
+  and location.hh files, nor does the parser will include them: the user is
+  then responsible to define her type.
+
+  This can be used in programs with several parsers to factor their location
+  and position files: let one of them generate them, and let the others
+  simply resue these types and files.
+
+  This feature was actually introduced, but not documented, in Bison 2.5,
+  under the name "location_type" (which is maintained for backward
+  compatibility).
+
 * Noteworthy changes in release 2.6.2 (2012-08-03) [stable]
 
 ** Bug fixes