errors: introduce the -Werror=CATEGORY option

[bison.git] / NEWS

diff --git a/NEWS b/NEWS
index f6e6a8c679071b4c3d8907dc095e90ff372c2a92..7e5bda2d42a127866022083b5c56ac0a31ed7ee9 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -67,6 +67,52 @@ GNU Bison NEWS
     %printer    {} token1 <type1> <type3>
     %destructor {} token2 <type2> <type4>
 
+*** Conflicts
+
+  The warnings and error messages about shift/reduce and reduce/reduce
+  conflicts have been normalized.  For instance on the following foo.y file:
+
+    %glr-parser
+    %%
+    exp: exp '+' exp | '0' | '0';
+
+  compare the previous version of bison:
+
+    $ bison foo.y
+    foo.y: conflicts: 1 shift/reduce, 2 reduce/reduce
+    $ bison -Werror foo.y
+    bison: warnings being treated as errors
+    foo.y: conflicts: 1 shift/reduce, 2 reduce/reduce
+
+  with the new behavior:
+
+    $ bison foo.y
+    foo.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
+    foo.y: warning: 2 reduce/reduce conflicts [-Wconflicts-rr]
+    $ bison -Werror foo.y
+    foo.y: error: 1 shift/reduce conflict [-Werror=conflicts-sr]
+    foo.y: error: 2 reduce/reduce conflicts [-Werror=conflicts-rr]
+
+  When %expect or %expect-rr is used, such as with bar.y:
+
+    %expect 0
+    %glr-parser
+    %%
+    exp: exp '+' exp | '0' | '0';
+
+  Former behavior:
+
+    $ bison bar.y
+    bar.y: conflicts: 1 shift/reduce, 2 reduce/reduce
+    bar.y: expected 0 shift/reduce conflicts
+    bar.y: expected 0 reduce/reduce conflicts
+
+  New one:
+
+    $ bison bar.y
+    bar.y: error: shift/reduce conflicts: 1 found, 0 expected
+    bar.y: error: reduce/reduce conflicts: 2 found, 0 expected
+
 ** Additional yylex/yyparse arguments
 
   The new directive %param declares additional arguments to both yylex and
@@ -145,8 +191,36 @@ GNU Bison NEWS
   the programmer to prune possible parses based on the values of run-time
   expressions.
 
+** The directive %expect-rr is now an error in non GLR mode
+
+  It used to be an error only if used in non GLR mode, _and_ if there are
+  reduce/reduce conflicts.
+
 * Noteworthy changes in release ?.? (????-??-??) [?]
 
+** Bug fixes
+
+  Bugs in the test suite have been fixed.
+
+  Some errors in translations have been addressed, and --help now directs
+  users to the appropriate place to report them.
+
+  Stray Info files shipped by accident are removed.
+
+  Incorrect definitions of YY_, issued by yacc.c when no parser header is
+  generated, are removed.
+
+** Changes in the format of errors and exceptions output
+
+  This used to be the format of many error reports:
+
+    foo.y:5.10-24: result type clash on merge function 'merge': <t3> != <t2>
+    foo.y:4.13-27: previous declaration
+
+  It is now:
+
+    foo.y:5.10-25: result type clash on merge function 'merge': <t3> != <t2>
+    foo.y:4.13-27:     previous declaration
 
 * Noteworthy changes in release 2.6.2 (2012-08-03) [stable]