NEWS

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