NEWS

   1 Bison News
   2 ----------
   3
   4 Changes in version 1.32, 2002-01-23:
   5
   6 * Fix Yacc output file names
   7
   8 * Portability fixes
   9
  10 * Italian, Dutch translations
  11 \f
  12 Changes in version 1.31, 2002-01-14:
  13
  14 * Many Bug Fixes
  15
  16 * GNU Gettext and %expect
  17   GNU Gettext asserts 10 s/r conflicts, but there are 7.  Now that
  18   Bison dies on incorrect %expectations, we fear there will be
  19   too many bug reports for Gettext, so _for the time being_, %expect
  20   does not trigger an error when the input file is named `plural.y'.
  21
  22 * Use of alloca in parsers
  23   If YYSTACK_USE_ALLOCA is defined to 0, then the parsers will use
  24   malloc exclusively.  Since 1.29, but was not NEWS'ed.
  25
  26   alloca is used only when compiled with GCC, to avoid portability
  27   problems as on AIX.
  28
  29 * When the generated parser lacks debugging code, YYDEBUG is now 0
  30   (as POSIX requires) instead of being undefined.
  31
  32 * User Actions
  33   Bison has always permitted actions such as { $$ = $1 }: it adds the
  34   ending semicolon.  Now if in Yacc compatibility mode, the semicolon
  35   is no longer output: one has to write { $$ = $1; }.
  36
  37 * Better C++ compliance
  38   The output parsers try to respect C++ namespaces.
  39
  40 * Reduced Grammars
  41   Fixed bugs when reporting useless nonterminals.
  42
  43 * 64 bit hosts
  44   The parsers work properly on 64 bit hosts.
  45
  46 * Error messages
  47   Some calls to strerror resulted in scrambled or missing error messages.
  48
  49 * %expect
  50   When the number of shift/reduce conflicts is correct, don't issue
  51   any warning.
  52
  53 * The verbose report includes the rule line numbers.
  54
  55 * Rule line numbers are fixed in traces.
  56
  57 * Swedish translation
  58
  59 * Parse errors
  60   Verbose parse error messages from the parsers are better looking.
  61   Before: parse error: unexpected `'/'', expecting `"number"' or `'-'' or `'(''
  62      Now: parse error: unexpected '/', expecting "number" or '-' or '('
  63
  64 * Fixed parser memory leaks.
  65   When the generated parser was using malloc to extend its stacks, the
  66   previous allocations were not freed.
  67
  68 * Fixed verbose output file.
  69   Some newlines were missing.
  70   Some conflicts in state descriptions were missing.
  71
  72 * Fixed conflict report.
  73   Option -v was needed to get the result.
  74
  75 * %expect
  76   Was not used.
  77   Mismatches are errors, not warnings.
  78
  79 * Fixed incorrect processing of some invalid input.
  80
  81 * Fixed CPP guards: 9foo.h uses BISON_9FOO_H instead of 9FOO_H.
  82
  83 * Fixed some typos in the documentation.
  84
  85 * %token MY_EOF 0 is supported.
  86   Before, MY_EOF was silently renumbered as 257.
  87
  88 * doc/refcard.tex is updated.
  89
  90 * %output, %file-prefix, %name-prefix.
  91   New.
  92
  93 * --output
  94   New, aliasing `--output-file'.
  95 \f
  96 Changes in version 1.30, 2001-10-26:
  97
  98 * `--defines' and `--graph' have now an optionnal argument which is the
  99   output file name. `-d' and `-g' do not change, they do not take any
 100   argument.
 101
 102 * `%source_extension' and `%header_extension' are removed, failed
 103   experiment.
 104
 105 * Portability fixes.
 106 \f
 107 Changes in version 1.29, 2001-09-07:
 108
 109 * The output file does not define const, as this caused problems when used
 110   with common autoconfiguration schemes.  If you still use ancient compilers
 111   that lack const, compile with the equivalent of the C compiler option
 112   `-Dconst='.  autoconf's AC_C_CONST macro provides one way to do this.
 113
 114 * Added `-g' and `--graph'.
 115
 116 * The Bison manual is now distributed under the terms of the GNU FDL.
 117
 118 * The input and the output files has automatically a similar extension.
 119
 120 * Russian translation added.
 121
 122 * NLS support updated; should hopefully be less troublesome.
 123
 124 * Added the old Bison reference card.
 125
 126 * Added `--locations' and `%locations'.
 127
 128 * Added `-S' and `--skeleton'.
 129
 130 * `%raw', `-r', `--raw' is disabled.
 131
 132 * Special characters are escaped when output.  This solves the problems
 133   of the #line lines with path names including backslashes.
 134
 135 * New directives.
 136   `%yacc', `%fixed_output_files', `%defines', `%no_parser', `%verbose',
 137   `%debug', `%source_extension' and `%header_extension'.
 138
 139 * @$
 140   Automatic location tracking.
 141 \f
 142 Changes in version 1.28, 1999-07-06:
 143
 144 * Should compile better now with K&R compilers.
 145
 146 * Added NLS.
 147
 148 * Fixed a problem with escaping the double quote character.
 149
 150 * There is now a FAQ.
 151 \f
 152 Changes in version 1.27:
 153
 154 * The make rule which prevented bison.simple from being created on
 155   some systems has been fixed.
 156 \f
 157 Changes in version 1.26:
 158
 159 * Bison now uses automake.
 160
 161 * New mailing lists: <bug-bison@gnu.org> and <help-bison@gnu.org>.
 162
 163 * Token numbers now start at 257 as previously documented, not 258.
 164
 165 * Bison honors the TMPDIR environment variable.
 166
 167 * A couple of buffer overruns have been fixed.
 168
 169 * Problems when closing files should now be reported.
 170
 171 * Generated parsers should now work even on operating systems which do
 172   not provide alloca().
 173 \f
 174 Changes in version 1.25, 1995-10-16:
 175
 176 * Errors in the input grammar are not fatal; Bison keeps reading
 177 the grammar file, and reports all the errors found in it.
 178
 179 * Tokens can now be specified as multiple-character strings: for
 180 example, you could use "<=" for a token which looks like <=, instead
 181 of chosing a name like LESSEQ.
 182
 183 * The %token_table declaration says to write a table of tokens (names
 184 and numbers) into the parser file.  The yylex function can use this
 185 table to recognize multiple-character string tokens, or for other
 186 purposes.
 187
 188 * The %no_lines declaration says not to generate any #line preprocessor
 189 directives in the parser file.
 190
 191 * The %raw declaration says to use internal Bison token numbers, not
 192 Yacc-compatible token numbers, when token names are defined as macros.
 193
 194 * The --no-parser option produces the parser tables without including
 195 the parser engine; a project can now use its own parser engine.
 196 The actions go into a separate file called NAME.act, in the form of
 197 a switch statement body.
 198 \f
 199 Changes in version 1.23:
 200
 201 The user can define YYPARSE_PARAM as the name of an argument to be
 202 passed into yyparse.  The argument should have type void *.  It should
 203 actually point to an object.  Grammar actions can access the variable
 204 by casting it to the proper pointer type.
 205
 206 Line numbers in output file corrected.
 207 \f
 208 Changes in version 1.22:
 209
 210 --help option added.
 211 \f
 212 Changes in version 1.20:
 213
 214 Output file does not redefine const for C++.
 215
 216 Local Variables:
 217 mode: outline
 218 End: