Bison News
----------
-Change in version 1.26:
+Changes in version 1.49a:
+
+* Undefined token
+ The undefined token was systematically mapped to 2 which prevented
+ the use of 2 from the user. This is no longer the case.
+
+* Undefined token
+ If yylex returned a code out of range, yyparse could die. This is
+ no longer the case.
+
+* Error token
+ According to POSIX, the error token should be numbered as 256.
+ Bison extends this requirement by making it a preference: *if* the
+ user specified that one of her tokens is numbered 256, then error
+ will be mapped onto another number.
+
+* Large grammars
+ Are now supported (large token numbers, large grammar size (= sum of
+ the LHS and RHS lengths), large LALR tables).
+
+* The initial rule is explicit.
+ Bison used to play hacks with the initial rule, which the user does
+ not write. It is now explicit, and visible in the reports and
+ graphs as rule 0.
+
+* Useless rules are actually removed.
+ Before, Bison reported the useless rules, but, although not used,
+ included them in the parsers.
+
+* False `Token not used' report fixed.
+ On a grammar such as
+
+ %token useless useful
+ %%
+ exp: '0' %prec useful;
+
+ where a token was used to set the precedence of the last rule,
+ bison reported both `useful' and `useless' as useless tokens.
+
+* Revert the C++ namespace changes introduced in 1.31, as they caused too
+ many portability hassles.
+
+* Items overflow
+ Bison no longer dumps core when there are too many items, it just
+ dies.
+
+* Token end-of-file
+ The token end of file may be specified by the user, in which case,
+ the user symbol is used in the reports, the graphs, and the verbose
+ error messages instead of `$', which remains being the defaults.
+ For instance
+ %token YYEOF 0
+ or
+ %token YYEOF 0 "end of file"
+\f
+Changes in version 1.31, 2002-01-14:
+
+* Many Bug Fixes
+
+* GNU Gettext and %expect
+ GNU Gettext asserts 10 s/r conflicts, but there are 7. Now that
+ Bison dies on incorrect %expectations, we fear there will be
+ too many bug reports for Gettext, so _for the time being_, %expect
+ does not trigger an error when the input file is named `plural.y'.
+
+* Use of alloca in parsers
+ If YYSTACK_USE_ALLOCA is defined to 0, then the parsers will use
+ malloc exclusively. Since 1.29, but was not NEWS'ed.
+
+ alloca is used only when compiled with GCC, to avoid portability
+ problems as on AIX.
+
+* When the generated parser lacks debugging code, YYDEBUG is now 0
+ (as POSIX requires) instead of being undefined.
+
+* User Actions
+ Bison has always permitted actions such as { $$ = $1 }: it adds the
+ ending semicolon. Now if in Yacc compatibility mode, the semicolon
+ is no longer output: one has to write { $$ = $1; }.
+
+* Better C++ compliance
+ The output parsers try to respect C++ namespaces.
+
+* Reduced Grammars
+ Fixed bugs when reporting useless nonterminals.
+
+* 64 bit hosts
+ The parsers work properly on 64 bit hosts.
+
+* Error messages
+ Some calls to strerror resulted in scrambled or missing error messages.
+
+* %expect
+ When the number of shift/reduce conflicts is correct, don't issue
+ any warning.
+
+* The verbose report includes the rule line numbers.
+
+* Rule line numbers are fixed in traces.
+
+* Swedish translation
+
+* Parse errors
+ Verbose parse error messages from the parsers are better looking.
+ Before: parse error: unexpected `'/'', expecting `"number"' or `'-'' or `'(''
+ Now: parse error: unexpected '/', expecting "number" or '-' or '('
+
+* Fixed parser memory leaks.
+ When the generated parser was using malloc to extend its stacks, the
+ previous allocations were not freed.
+
+* Fixed verbose output file.
+ Some newlines were missing.
+ Some conflicts in state descriptions were missing.
+
+* Fixed conflict report.
+ Option -v was needed to get the result.
+
+* %expect
+ Was not used.
+ Mismatches are errors, not warnings.
+
+* Fixed incorrect processing of some invalid input.
+
+* Fixed CPP guards: 9foo.h uses BISON_9FOO_H instead of 9FOO_H.
+
+* Fixed some typos in the documentation.
+
+* %token MY_EOF 0 is supported.
+ Before, MY_EOF was silently renumbered as 257.
+
+* doc/refcard.tex is updated.
+
+* %output, %file-prefix, %name-prefix.
+ New.
+
+* --output
+ New, aliasing `--output-file'.
+\f
+Changes in version 1.30:
+
+* `--defines' and `--graph' have now an optionnal argument which is the
+ output file name. `-d' and `-g' do not change, they do not take any
+ argument.
+
+* `%source_extension' and `%header_extension' are removed, failed
+ experiment.
+
+* Portability fixes.
+\f
+Changes in version 1.29, 2001-09-07:
+
+* The output file does not define const, as this caused problems when used
+ with common autoconfiguration schemes. If you still use ancient compilers
+ that lack const, compile with the equivalent of the C compiler option
+ `-Dconst='. autoconf's AC_C_CONST macro provides one way to do this.
+
+* Added `-g' and `--graph'.
+
+* The Bison manual is now distributed under the terms of the GNU FDL.
+
+* The input and the output files has automatically a similar extension.
+
+* Russian translation added.
+
+* NLS support updated; should hopefully be less troublesome.
+
+* Added the old Bison reference card.
+
+* Added `--locations' and `%locations'.
+
+* Added `-S' and `--skeleton'.
+
+* `%raw', `-r', `--raw' is disabled.
+
+* Special characters are escaped when output. This solves the problems
+ of the #line lines with path names including backslashes.
+
+* New directives.
+ `%yacc', `%fixed_output_files', `%defines', `%no_parser', `%verbose',
+ `%debug', `%source_extension' and `%header_extension'.
+
+* @$
+ Automatic location tracking.
+\f
+Changes in version 1.28, 1999-07-06:
+
+* Should compile better now with K&R compilers.
+
+* Added NLS.
+
+* Fixed a problem with escaping the double quote character.
+
+* There is now a FAQ.
+\f
+Changes in version 1.27:
+
+* The make rule which prevented bison.simple from being created on
+ some systems has been fixed.
+\f
+Changes in version 1.26:
* Bison now uses automake.
* Generated parsers should now work even on operating systems which do
not provide alloca().
\f
-Change in version 1.25:
+Changes in version 1.25, 1995-10-16:
* Errors in the input grammar are not fatal; Bison keeps reading
the grammar file, and reports all the errors found in it.
-
+
* Tokens can now be specified as multiple-character strings: for
example, you could use "<=" for a token which looks like <=, instead
of chosing a name like LESSEQ.
Changes in version 1.20:
Output file does not redefine const for C++.
+
+Local Variables:
+mode: outline
+End:
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