*** Obsolete features
- Support for YYFAIL is removed, as announced since Bison 2.4.2.
+ Support for YYFAIL is removed (deprecated in Bison 2.4.2).
Support for yystype and yyltype (instead of YYSTYPE and YYLTYPE)
- is removed, as announced in Bison 1.875.
+ is removed (deprecated in Bison 1.875).
+ Support for YYPARSE_PARAM is removed (deprecated in Bison 1.875).
** Warnings
-*** Warning categories are now displayed in warnings
+*** Deprecated constructs
+
+ A new warning category, 'deprecated', is used to flag obsolete constructs
+ whose support will be discontinued. It is enabled by default. These
+ warnings used to be reported as 'other' warnings.
+
+*** Warning categories are now displayed
For instance:
3.28-34: warning: type <type3> is used, but is not associated to any symbol
4.28-34: warning: type <type4> is used, but is not associated to any symbol
-*** Undeclared symbols
+*** Undefined but unused symbols
- Bison used to raise an error for %printer and %destructor directives for
- undefined symbols.
+ Bison used to raise an error for undefined symbols that are not used in
+ the grammar. This is now only a warning.
%printer {} symbol1
%destructor {} symbol2
+ %type <type> symbol3
%%
exp: "a";
- This is now only a warning.
-
*** Useless destructors or printers
Bison now warns about useless destructors or printers. In the following
Also, it is possible to add code to the parser's constructors using
"%code init" and "%define init_throws".
-** C++ skeleton improvements
+** C++ skeletons improvements
+
+*** The parser header is no longer mandatory (lalr1.cc, glr.cc)
+
+ Using %defines is now optional. Without it, the needed support classes
+ are defined in the generated parser, instead of additional files (such as
+ location.hh, position.hh and stack.hh).
+
+*** Locations are no longer mandatory (lalr1.cc, glr.cc)
+
+ Both lalr1.cc and glr.cc no longer require %location.
+
+*** syntax_error exception (lalr1.cc)
The C++ parser features a syntax_error exception, which can be
thrown from the scanner or from user rules to raise syntax errors.
* Noteworthy changes in release ?.? (????-??-??) [?]
+* Noteworthy changes in release 2.6.2 (2012-08-03) [stable]
+
+** Bug fixes
+
+ Buffer overruns, complaints from Flex, and portability issues in the test
+ suite have been fixed.
+
+** Spaces in %lex- and %parse-param (lalr1.cc, glr.cc)
+
+ Trailing end-of-lines in %parse-param or %lex-param would result in
+ invalid C++. This is fixed.
+
+** Spurious spaces and end-of-lines
+
+ The generated files no longer end (nor start) with empty lines.
+
+* Noteworthy changes in release 2.6.1 (2012-07-30) [stable]
+
+ Bison no longer executes user-specified M4 code when processing a grammar.
+
+** Future Changes
+
+ In addition to the removal of the features announced in Bison 2.6, the
+ next major release will remove the "Temporary hack for adding a semicolon
+ to the user action", as announced in the release 2.5. Instead of:
+
+ exp: exp "+" exp { $$ = $1 + $3 };
+
+ write:
+
+ exp: exp "+" exp { $$ = $1 + $3; };
+
+** Bug fixes
+
+*** Type names are now properly escaped.
+
+*** glr.cc: set_debug_level and debug_level work as expected.
+
+*** Stray @ or $ in actions
+
+ While Bison used to warn about stray $ or @ in action rules, it did not
+ for other actions such as printers, destructors, or initial actions. It
+ now does.
+
+** Type names in actions
+
+ For consistency with rule actions, it is now possible to qualify $$ by a
+ type-name in destructors, printers, and initial actions. For instance:
+
+ %printer { fprintf (yyo, "(%d, %f)", $<ival>$, $<fval>$); } <*> <>;
+
+ will display two values for each typed and untyped symbol (provided
+ that YYSTYPE has both "ival" and "fval" fields).
+
* Noteworthy changes in release 2.6 (2012-07-19) [stable]
** Future changes:
The next major release of Bison will drop support for the following
deprecated features. Please report disagreements to bug-bison@gnu.org.
-*** K&C parsers
+*** K&R C parsers
Support for generating parsers in K&R C will be removed. Parsers
generated for C support ISO C90, and are tested with ISO C99 and ISO C11
projects / bison.git / blobdiff