tests/input.at

   1 # Checking the Bison scanner.                    -*- Autotest -*-
   2
   3 # Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
   4 # Free Software Foundation, Inc.
   5
   6 # This program is free software: you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation, either version 3 of the License, or
   9 # (at your option) any later version.
  10 #
  11 # This program is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 # GNU General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License
  17 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18
  19 AT_BANNER([[Input Processing.]])
  20
  21 # Mostly test that we are robust to mistakes.
  22
  23
  24 ## ------------ ##
  25 ## Invalid $n.  ##
  26 ## ------------ ##
  27
  28 AT_SETUP([Invalid $n and @n])
  29
  30 AT_DATA([input.y],
  31 [[%%
  32 exp: { $$ = $1 ; };
  33 exp: { @$ = @1 ; };
  34 ]])
  35
  36 AT_BISON_CHECK([input.y], [1], [],
  37 [[input.y:2.13-14: integer out of range: `$1'
  38 input.y:3.13-14: integer out of range: `@1'
  39 ]])
  40
  41 AT_CLEANUP
  42
  43
  44 ## -------------- ##
  45 ## Type Clashes.  ##
  46 ## -------------- ##
  47
  48 AT_SETUP([Type Clashes])
  49
  50 AT_DATA([input.y],
  51 [[%union { int bar; }
  52 %token foo
  53 %type <bar> exp
  54 %%
  55 exp: foo { $$; } foo { $2; } foo
  56    | foo
  57    | /* Empty. */
  58    ;
  59 ]])
  60
  61 AT_BISON_CHECK([input.y], [1], [],
  62 [[input.y:5.12-13: $$ for the midrule at $2 of `exp' has no declared type
  63 input.y:5.24-25: $2 of `exp' has no declared type
  64 input.y:5.6-32: warning: type clash on default action: <bar> != <>
  65 input.y:6.6-8: warning: type clash on default action: <bar> != <>
  66 input.y:7.5: warning: empty rule for typed nonterminal, and no action
  67 ]])
  68
  69 AT_CLEANUP
  70
  71
  72 # _AT_UNUSED_VALUES_DECLARATIONS()
  73 # --------------------------------
  74 # Generate the token, type, and destructor
  75 # declarations for the unused values tests.
  76 m4_define([_AT_UNUSED_VALUES_DECLARATIONS],
  77 [[[%token <integer> INT;
  78 %type <integer> a b c d e f g h i j k l;
  79 %destructor { destroy ($$); } INT a b c d e f g h i j k l;]]])
  80
  81
  82 # AT_CHECK_UNUSED_VALUES(DECLARATIONS_AFTER, CHECK_MIDRULE_VALUES)
  83 # ----------------------------------------------------------------
  84 # Generate a grammar to test unused values, compile it, run it.  If
  85 # DECLARATIONS_AFTER is set, then the token, type, and destructor
  86 # declarations are generated after the rules rather than before.  If
  87 # CHECK_MIDRULE_VALUES is set, then --warnings=midrule-values is set.
  88 m4_define([AT_CHECK_UNUSED_VALUES],
  89 [AT_DATA([input.y],
  90 m4_ifval($1, [
  91
  92
  93 ], [_AT_UNUSED_VALUES_DECLARATIONS
  94 ])[[%%
  95 start:
  96   'a' a { $]2[; } | 'b' b { $]2[; } | 'c' c { $]2[; } | 'd' d { $]2[; }
  97 | 'e' e { $]2[; } | 'f' f { $]2[; } | 'g' g { $]2[; } | 'h' h { $]2[; }
  98 | 'i' i { $]2[; } | 'j' j { $]2[; } | 'k' k { $]2[; } | 'l' l { $]2[; }
  99 ;
 100
 101 a: INT | INT { } INT { } INT { };
 102 b: INT | /* empty */;
 103 c: INT | INT { $]1[; } INT { $<integer>2; } INT { $<integer>4; };
 104 d: INT | INT { } INT { $]1[; } INT { $<integer>2; };
 105 e: INT | INT { } INT {  } INT { $]1[; };
 106 f: INT | INT { } INT {  } INT { $]$[ = $]1[ + $]3[ + $]5[; };
 107 g: INT | INT { $<integer>$; } INT { $<integer>$; } INT { };
 108 h: INT | INT { $<integer>$; } INT { $<integer>$ = $<integer>2; } INT { };
 109 i: INT | INT INT { } { $]$[ = $]1[ + $]2[; };
 110 j: INT | INT INT { $<integer>$ = 1; } { $]$[ = $]1[ + $]2[; };
 111 k: INT | INT INT { $<integer>$; } { $<integer>$ = $<integer>3; } { };
 112 l: INT | INT { $<integer>$ = $<integer>1; } INT { $<integer>$ = $<integer>2 + $<integer>3; } INT { $<integer>$ = $<integer>4 + $<integer>5; };]]m4_ifval($1, [
 113 _AT_UNUSED_VALUES_DECLARATIONS])
 114 )
 115
 116 AT_BISON_CHECK(m4_ifval($2, [ --warnings=midrule-values ])[ input.y], [0], [],
 117 [[input.y:11.10-32: warning: unset value: $]$[
 118 input.y:11.10-32: warning: unused value: $]1[
 119 input.y:11.10-32: warning: unused value: $]3[
 120 input.y:11.10-32: warning: unused value: $]5[
 121 input.y:12.9: warning: empty rule for typed nonterminal, and no action
 122 ]]m4_ifval($2, [[[input.y:13.14-20: warning: unset value: $$
 123 input.y:13.26-41: warning: unset value: $$
 124 ]]])[[input.y:13.10-62: warning: unset value: $]$[
 125 input.y:13.10-62: warning: unused value: $]3[
 126 input.y:13.10-62: warning: unused value: $]5[
 127 ]]m4_ifval($2, [[[input.y:14.14-16: warning: unset value: $$
 128 ]]])[[input.y:14.10-49: warning: unset value: $]$[
 129 input.y:14.10-49: warning: unused value: $]3[
 130 input.y:14.10-49: warning: unused value: $]5[
 131 input.y:15.10-37: warning: unset value: $]$[
 132 input.y:15.10-37: warning: unused value: $]3[
 133 input.y:15.10-37: warning: unused value: $]5[
 134 input.y:17.10-58: warning: unset value: $]$[
 135 input.y:17.10-58: warning: unused value: $]1[
 136 ]]m4_ifval($2, [[[input.y:17.10-58: warning: unused value: $]2[
 137 ]]])[[input.y:17.10-58: warning: unused value: $]3[
 138 ]]m4_ifval($2, [[[input.y:17.10-58: warning: unused value: $]4[
 139 ]]])[[input.y:17.10-58: warning: unused value: $]5[
 140 input.y:18.10-72: warning: unset value: $]$[
 141 input.y:18.10-72: warning: unused value: $]1[
 142 input.y:18.10-72: warning: unused value: $]3[
 143 ]]m4_ifval($2, [[[input.y:18.10-72: warning: unused value: $]4[
 144 ]]])[[input.y:18.10-72: warning: unused value: $]5[
 145 ]]m4_ifval($2, [[[input.y:20.10-55: warning: unused value: $]3[
 146 ]]])[[input.y:21.10-68: warning: unset value: $]$[
 147 input.y:21.10-68: warning: unused value: $]1[
 148 input.y:21.10-68: warning: unused value: $]2[
 149 ]]m4_ifval($2, [[[input.y:21.10-68: warning: unused value: $]4[
 150 ]]]))])
 151
 152
 153 ## --------------- ##
 154 ## Unused values.  ##
 155 ## --------------- ##
 156
 157 AT_SETUP([Unused values])
 158 AT_CHECK_UNUSED_VALUES
 159 AT_CHECK_UNUSED_VALUES(, [1])
 160 AT_CLEANUP
 161
 162
 163 ## ------------------------------------------ ##
 164 ## Unused values before symbol declarations.  ##
 165 ## ------------------------------------------ ##
 166
 167 AT_SETUP([Unused values before symbol declarations])
 168 AT_CHECK_UNUSED_VALUES([1])
 169 AT_CHECK_UNUSED_VALUES([1], [1])
 170 AT_CLEANUP
 171
 172
 173 ## --------------------------------------------- ##
 174 ## Default %printer and %destructor redeclared.  ##
 175 ## --------------------------------------------- ##
 176
 177 AT_SETUP([Default %printer and %destructor redeclared])
 178
 179 AT_DATA([[input.y]],
 180 [[%destructor { destroy ($$); } <*> <*>
 181 %printer { destroy ($$); } <*> <*>
 182
 183 %destructor { destroy ($$); } <*>
 184 %printer { destroy ($$); } <*>
 185
 186 %destructor { destroy ($$); } <> <>
 187 %printer { destroy ($$); } <> <>
 188
 189 %destructor { destroy ($$); } <>
 190 %printer { destroy ($$); } <>
 191
 192 %%
 193
 194 start: ;
 195
 196 %destructor { destroy ($$); } <*>;
 197 %printer { destroy ($$); } <*>;
 198
 199 %destructor { destroy ($$); } <>;
 200 %printer { destroy ($$); } <>;
 201 ]])
 202
 203 AT_BISON_CHECK([input.y], [1], [],
 204 [[input.y:1.13-29: redeclaration for default tagged %destructor
 205 input.y:1.13-29: previous declaration
 206 input.y:2.10-26: redeclaration for default tagged %printer
 207 input.y:2.10-26: previous declaration
 208 input.y:4.13-29: redeclaration for default tagged %destructor
 209 input.y:1.13-29: previous declaration
 210 input.y:5.10-26: redeclaration for default tagged %printer
 211 input.y:2.10-26: previous declaration
 212 input.y:7.13-29: redeclaration for default tagless %destructor
 213 input.y:7.13-29: previous declaration
 214 input.y:8.10-26: redeclaration for default tagless %printer
 215 input.y:8.10-26: previous declaration
 216 input.y:10.13-29: redeclaration for default tagless %destructor
 217 input.y:7.13-29: previous declaration
 218 input.y:11.10-26: redeclaration for default tagless %printer
 219 input.y:8.10-26: previous declaration
 220 input.y:17.13-29: redeclaration for default tagged %destructor
 221 input.y:4.13-29: previous declaration
 222 input.y:18.10-26: redeclaration for default tagged %printer
 223 input.y:5.10-26: previous declaration
 224 input.y:20.13-29: redeclaration for default tagless %destructor
 225 input.y:10.13-29: previous declaration
 226 input.y:21.10-26: redeclaration for default tagless %printer
 227 input.y:11.10-26: previous declaration
 228 ]])
 229
 230 AT_CLEANUP
 231
 232
 233 ## ---------------------------------------------- ##
 234 ## Per-type %printer and %destructor redeclared.  ##
 235 ## ---------------------------------------------- ##
 236
 237 AT_SETUP([Per-type %printer and %destructor redeclared])
 238
 239 AT_DATA([[input.y]],
 240 [[%destructor { destroy ($$); } <field1> <field2>
 241 %printer { destroy ($$); } <field1> <field2>
 242
 243 %destructor { destroy ($$); } <field1> <field1>
 244 %printer { destroy ($$); } <field2> <field2>
 245
 246 %%
 247
 248 start: ;
 249
 250 %destructor { destroy ($$); } <field2> <field1>;
 251 %printer { destroy ($$); } <field2> <field1>;
 252 ]])
 253
 254 AT_BISON_CHECK([input.y], [1], [],
 255 [[input.y:4.13-29: %destructor redeclaration for <field1>
 256 input.y:1.13-29: previous declaration
 257 input.y:4.13-29: %destructor redeclaration for <field1>
 258 input.y:4.13-29: previous declaration
 259 input.y:5.10-26: %printer redeclaration for <field2>
 260 input.y:2.10-26: previous declaration
 261 input.y:5.10-26: %printer redeclaration for <field2>
 262 input.y:5.10-26: previous declaration
 263 input.y:11.13-29: %destructor redeclaration for <field1>
 264 input.y:4.13-29: previous declaration
 265 input.y:11.13-29: %destructor redeclaration for <field2>
 266 input.y:1.13-29: previous declaration
 267 input.y:12.10-26: %printer redeclaration for <field1>
 268 input.y:2.10-26: previous declaration
 269 input.y:12.10-26: %printer redeclaration for <field2>
 270 input.y:5.10-26: previous declaration
 271 ]])
 272
 273 AT_CLEANUP
 274
 275
 276 ## ---------------------------------------- ##
 277 ## Unused values with default %destructor.  ##
 278 ## ---------------------------------------- ##
 279
 280 AT_SETUP([Unused values with default %destructor])
 281
 282 AT_DATA([[input.y]],
 283 [[%destructor { destroy ($$); } <>
 284 %type <tag> tagged
 285
 286 %%
 287
 288 start: end end tagged tagged { $<tag>1; $3; } ;
 289 end: { } ;
 290 tagged: { } ;
 291 ]])
 292
 293 AT_BISON_CHECK([input.y], [0], [],
 294 [[input.y:6.8-45: warning: unset value: $$
 295 input.y:6.8-45: warning: unused value: $2
 296 input.y:7.6-8: warning: unset value: $$
 297 ]])
 298
 299 AT_DATA([[input.y]],
 300 [[%destructor { destroy ($$); } <*>
 301 %type <tag> tagged
 302
 303 %%
 304
 305 start: end end tagged tagged { $<tag>1; $3; } ;
 306 end: { } ;
 307 tagged: { } ;
 308 ]])
 309
 310 AT_BISON_CHECK([input.y], [0], [],
 311 [[input.y:6.8-45: warning: unused value: $4
 312 input.y:8.9-11: warning: unset value: $$
 313 ]])
 314
 315 AT_CLEANUP
 316
 317
 318 ## ----------------------------------------- ##
 319 ## Unused values with per-type %destructor.  ##
 320 ## ----------------------------------------- ##
 321
 322 AT_SETUP([Unused values with per-type %destructor])
 323
 324 AT_DATA([[input.y]],
 325 [[%destructor { destroy ($$); } <field1>
 326 %type <field1> start end
 327
 328 %%
 329
 330 start: end end { $1; } ;
 331 end: { }  ;
 332 ]])
 333
 334 AT_BISON_CHECK([input.y], [0], [],
 335 [[input.y:6.8-22: warning: unset value: $$
 336 input.y:6.8-22: warning: unused value: $2
 337 input.y:7.6-8: warning: unset value: $$
 338 ]])
 339
 340 AT_CLEANUP
 341
 342
 343 ## ---------------------- ##
 344 ## Incompatible Aliases.  ##
 345 ## ---------------------- ##
 346
 347 AT_SETUP([Incompatible Aliases])
 348
 349 AT_DATA([input.y],
 350 [[%token foo "foo"
 351
 352 %type <bar>       foo
 353 %printer {bar}    foo
 354 %destructor {bar} foo
 355 %left             foo
 356
 357 %type <baz>       "foo"
 358 %printer {baz}    "foo"
 359 %destructor {baz} "foo"
 360 %left             "foo"
 361
 362 %%
 363 exp: foo;
 364 ]])
 365
 366 AT_BISON_CHECK([input.y], [1], [],
 367 [[input.y:8.7-11: %type redeclaration for foo
 368 input.y:3.7-11: previous declaration
 369 input.y:10.13-17: %destructor redeclaration for foo
 370 input.y:5.13-17: previous declaration
 371 input.y:9.10-14: %printer redeclaration for foo
 372 input.y:4.10-14: previous declaration
 373 input.y:11.1-5: %left redeclaration for foo
 374 input.y:6.1-5: previous declaration
 375 ]])
 376
 377 AT_CLEANUP
 378
 379
 380
 381 ## ----------------------- ##
 382 ## Torturing the Scanner.  ##
 383 ## ----------------------- ##
 384
 385 # Be sure to compile and run, so that the C compiler checks what
 386 # we do.
 387
 388 AT_SETUP([Torturing the Scanner])
 389
 390
 391 AT_DATA([input.y], [])
 392 AT_BISON_CHECK([input.y], [1], [],
 393 [[input.y:1.1: syntax error, unexpected end of file
 394 ]])
 395
 396
 397 AT_DATA([input.y],
 398 [{}
 399 ])
 400 AT_BISON_CHECK([input.y], [1], [],
 401 [[input.y:1.1-2: syntax error, unexpected {...}
 402 ]])
 403
 404
 405 AT_DATA_GRAMMAR([input.y],
 406 [[%{
 407 /* This is seen in GCC: a %{ and %} in middle of a comment. */
 408 const char *foo = "So %{ and %} can be here too.";
 409
 410 #if 0
 411 /* These examples test Bison while not stressing C compilers too much.
 412    Many C compilers mishandle backslash-newlines, so this part of the
 413    test is inside "#if 0".  The comment and string are written so that
 414    the "#endif" will be seen regardless of the C compiler bugs that we
 415    know about, namely:
 416
 417      HP C (as of late 2002) mishandles *\[newline]\[newline]/ within a
 418      comment.
 419
 420      The Apple Darwin compiler (as of late 2002) mishandles
 421      \\[newline]' within a character constant.
 422
 423    */
 424
 425 /\
 426 * A comment with backslash-newlines in it. %} *\
 427 \
 428 /
 429 /* { Close the above comment, if the C compiler mishandled it.  */
 430
 431 char str[] = "\\
 432 " A string with backslash-newlines in it %{ %} \\
 433 \
 434 "";
 435
 436 char apostrophe = '\'';
 437 #endif
 438
 439 #include <stdio.h>
 440 #include <stdlib.h>
 441 %}
 442 /* %{ and %} can be here too. */
 443
 444 %{
 445 /* Exercise pre-prologue dependency to %union.  */
 446 typedef int value;
 447 %}
 448
 449 /* Exercise M4 quoting: '@:>@@:>@', 0.  */
 450
 451 /* Also exercise %union. */
 452 %union
 453 {
 454   value ival; /* A comment to exercise an old bug. */
 455 };
 456
 457
 458 /* Exercise post-prologue dependency to %union.  */
 459 %{
 460 static YYSTYPE value_as_yystype (value val);
 461
 462 /* Exercise quotes in declarations.  */
 463 char quote[] = "@:>@@:>@,";
 464 %}
 465
 466 %{
 467 static void yyerror (const char *s);
 468 static int yylex (void);
 469 %}
 470
 471 %type <ival> '@<:@'
 472
 473 /* Exercise quotes in strings.  */
 474 %token FAKE "fake @<:@@:>@ \a\b\f\n\r\t\v\"\'\?\\\u005B\U0000005c ??!??'??(??)??-??/??<??=??> \x1\1"
 475
 476 %%
 477 /* Exercise M4 quoting: '@:>@@:>@', @<:@, 1.  */
 478 exp: '@<:@' '\1' two '$' '@' '{' oline output.or.oline.opt
 479   {
 480     /* Exercise quotes in braces.  */
 481     char tmp[] = "@<:@%c@:>@,\n";
 482     printf (tmp, $1);
 483   }
 484 ;
 485
 486 two: '\x000000000000000000000000000000000000000000000000000000000000000000002';
 487 oline: '@' 'o' 'l' 'i' 'n' 'e' '@' '_' '_' 'o' 'l' 'i' 'n' 'e' '_' '_';
 488 output.or.oline.opt: ;|oline;;|output;;;
 489 output: '#' 'o' 'u' 't' 'p' 'u' 't' ' ';
 490 %%
 491 /* Exercise M4 quoting: '@:>@@:>@', @<:@, 2.  */
 492
 493 static YYSTYPE
 494 value_as_yystype (value val)
 495 {
 496   YYSTYPE res;
 497   res.ival = val;
 498   return res;
 499 }
 500
 501 static int
 502 yylex (void)
 503 {
 504   static char const input[] = "@<:@\1\2$@{@oline@__@&t@oline__\
 505 #output "; /* "
 506   */
 507   static size_t toknum;
 508   if (! (toknum < sizeof input))
 509     abort ();
 510   yylval = value_as_yystype (input[toknum]);
 511   return input[toknum++];
 512 }
 513
 514 static void
 515 yyerror (const char *msg)
 516 {
 517   fprintf (stderr, "%s\n", msg);
 518 }
 519 ]])
 520
 521 # Pacify Emacs'font-lock-mode: "
 522
 523 AT_DATA([main.c],
 524 [[typedef int value;
 525 #include "input.h"
 526
 527 int yyparse (void);
 528
 529 int
 530 main (void)
 531 {
 532   return yyparse ();
 533 }
 534 ]])
 535
 536 AT_BISON_CHECK([-d -v -o input.c input.y])
 537 AT_COMPILE([input.o], [-c input.c])
 538 AT_COMPILE([main.o], [-c main.c])
 539 AT_COMPILE([input], [input.o main.o])
 540 AT_PARSER_CHECK([./input], 0,
 541 [[[@<:@],
 542 ]])
 543
 544 AT_CLEANUP
 545
 546
 547 ## ---------------------- ##
 548 ## Typed symbol aliases.  ##
 549 ## ---------------------- ##
 550
 551 AT_SETUP([Typed symbol aliases])
 552
 553 # Bison 2.0 broke typed symbol aliases - ensure they work.
 554
 555 AT_DATA_GRAMMAR([input.y],
 556 [[%union
 557 {
 558   int val;
 559 };
 560 %token <val> MY_TOKEN "MY TOKEN"
 561 %type <val> exp
 562 %%
 563 exp: "MY TOKEN";
 564 %%
 565 ]])
 566
 567 AT_BISON_CHECK([-o input.c input.y])
 568
 569 AT_CLEANUP
 570
 571
 572 ## --------- ##
 573 ## Require.  ##
 574 ## --------- ##
 575
 576 m4_define([AT_CHECK_REQUIRE],
 577 [AT_SETUP([Require $1])
 578 AT_DATA_GRAMMAR([input.y],
 579 [[%require "$1";
 580 %%
 581 empty_file:;
 582 ]])
 583 AT_BISON_CHECK([-o input.c input.y], $2, [], ignore)
 584 AT_CLEANUP
 585 ])
 586
 587 AT_CHECK_REQUIRE(1.0, 0)
 588 AT_CHECK_REQUIRE(AT_PACKAGE_VERSION, 0)
 589 ## FIXME: Some day augment this version number.
 590 AT_CHECK_REQUIRE(100.0, 63)
 591
 592
 593 ## ------------------------------------- ##
 594 ## String aliases for character tokens.  ##
 595 ## ------------------------------------- ##
 596
 597 AT_SETUP([String aliases for character tokens])
 598
 599 # Bison once thought a character token and its alias were different
 600 # symbols with the same user token number.
 601
 602 AT_DATA_GRAMMAR([input.y],
 603 [[%token 'a' "a"
 604 %%
 605 start: 'a';
 606 %%
 607 ]])
 608
 609 AT_BISON_CHECK([-o input.c input.y])
 610
 611 AT_CLEANUP
 612
 613
 614 ## -------------- ##
 615 ## Symbol names.  ##
 616 ## -------------- ##
 617
 618 AT_SETUP([Symbols])
 619
 620 AT_DATA_GRAMMAR([input.y],
 621 [[%token WITH-DASH
 622 %token WITHOUT_DASH "WITHOUT-DASH"
 623 %token WITH.PERIOD
 624 %token WITHOUT_PERIOD "WITHOUT.PERIOD"
 625 %code {
 626   void yyerror (char const *);
 627   int yylex (void);
 628 }
 629 %%
 630 start: with-dash without_dash with.period without_period;
 631 with-dash: WITH-DASH;
 632 without_dash: "WITHOUT-DASH";
 633 with.period: WITH.PERIOD;
 634 without_period: "WITHOUT.PERIOD";
 635 %%
 636 ]])
 637
 638 # POSIX Yacc accept periods, but not dashes.
 639 AT_BISON_CHECK([--yacc input.y], [1], [],
 640 [[input.y:9.8-16: POSIX Yacc forbids dashes in symbol names: WITH-DASH
 641 input.y:18.8-16: POSIX Yacc forbids dashes in symbol names: with-dash
 642 ]])
 643
 644 # So warn about them.
 645 AT_BISON_CHECK([-Wyacc input.y], [], [],
 646 [[input.y:9.8-16: warning: POSIX Yacc forbids dashes in symbol names: WITH-DASH
 647 input.y:18.8-16: warning: POSIX Yacc forbids dashes in symbol names: with-dash
 648 ]])
 649
 650 # Dashes are fine for GNU Bison.
 651 AT_BISON_CHECK([-o input.c input.y])
 652
 653 # Make sure we don't export silly token identifiers with periods or dashes.
 654 AT_COMPILE([input.o], [-c input.c])
 655
 656
 657 # Periods and dashes are genuine letters, they can start identifiers.
 658 # Digits cannot.
 659 AT_DATA_GRAMMAR([input.y],
 660 [[%token .GOOD
 661          -GOOD
 662          1NV4L1D
 663 %%
 664 start: .GOOD -GOOD
 665 ]])
 666 AT_BISON_CHECK([-o input.c input.y], [1], [],
 667 [[input.y:11.10-16: invalid identifier: `1NV4L1D'
 668 ]])
 669
 670 AT_CLEANUP
 671
 672
 673 ## ----------------- ##
 674 ## Numbered tokens.  ##
 675 ## ----------------- ##
 676
 677 AT_SETUP([Numbered tokens])
 678
 679 AT_DATA_GRAMMAR([redecl.y],
 680 [[%token DECIMAL_1     11259375
 681          HEXADECIMAL_1 0xabcdef
 682          HEXADECIMAL_2 0xFEDCBA
 683          DECIMAL_2     16702650
 684 %%
 685 start: DECIMAL_1 HEXADECIMAL_2;
 686 ]])
 687
 688 AT_BISON_CHECK([redecl.y], [1], [],
 689 [[redecl.y:10.10-22: user token number 11259375 redeclaration for HEXADECIMAL_1
 690 redecl.y:9.8-16: previous declaration for DECIMAL_1
 691 redecl.y:12.10-18: user token number 16702650 redeclaration for DECIMAL_2
 692 redecl.y:11.10-22: previous declaration for HEXADECIMAL_2
 693 ]])
 694
 695 AT_DATA_GRAMMAR([too-large.y],
 696 [[%token TOO_LARGE_DEC 999999999999999999999
 697          TOO_LARGE_HEX 0xFFFFFFFFFFFFFFFFFFF
 698 %%
 699 start: TOO_LARGE_DEC TOO_LARGE_HEX
 700 %%
 701 ]])
 702
 703 AT_BISON_CHECK([too-large.y], [1], [],
 704 [[too-large.y:9.22-42: integer out of range: `999999999999999999999'
 705 too-large.y:10.24-44: integer out of range: `0xFFFFFFFFFFFFFFFFFFF'
 706 ]])
 707
 708 AT_CLEANUP
 709
 710
 711 ## --------------------- ##
 712 ## Unclosed constructs.  ##
 713 ## --------------------- ##
 714
 715 AT_SETUP([Unclosed constructs])
 716
 717 # Bison's scan-gram.l once forgot to STRING_FINISH some unclosed
 718 # constructs, so they were prepended to whatever it STRING_GROW'ed
 719 # next.  It also threw them away rather than returning them to the
 720 # parser.  The effect was confusing subsequent error messages.
 721
 722 AT_DATA([input.y],
 723 [[%token A "a
 724 %token B "b"
 725 %token AB "ab" // Used to complain that "ab" was already used.
 726 %token C '1
 727 %token TWO "2"
 728 %token TICK_TWELVE "'12" // Used to complain that "'12" was already used.
 729
 730 %%
 731
 732 start: ;
 733
 734 // Used to report a syntax error because it didn't see any kind of symbol
 735 // identifier.
 736 %type <f> 'a
 737 ;
 738 %type <f> "a
 739 ;
 740 // Used to report a syntax error because it didn't see braced code.
 741 %destructor { free ($$)
 742 ]])
 743
 744 AT_BISON_CHECK([-o input.c input.y], 1, [],
 745 [[input.y:1.10-2.0: missing `"' at end of line
 746 input.y:4.10-5.0: missing `'' at end of line
 747 input.y:14.11-15.0: missing `'' at end of line
 748 input.y:16.11-17.0: missing `"' at end of line
 749 input.y:19.13-20.0: missing `}' at end of file
 750 input.y:20.1: syntax error, unexpected end of file
 751 ]])
 752
 753 AT_CLEANUP
 754
 755
 756 ## ------------------------- ##
 757 ## %start after first rule.  ##
 758 ## ------------------------- ##
 759
 760 AT_SETUP([%start after first rule])
 761
 762 # Bison once complained that a %start after the first rule was a
 763 # redeclaration of the start symbol.
 764
 765 AT_DATA([input.y],
 766 [[%%
 767 false_start: ;
 768 start: false_start ;
 769 %start start;
 770 ]])
 771
 772 AT_BISON_CHECK([-o input.c input.y])
 773
 774 AT_CLEANUP
 775
 776
 777 ## --------------------- ##
 778 ## %prec takes a token.  ##
 779 ## --------------------- ##
 780
 781 AT_SETUP([%prec takes a token])
 782
 783 # Bison once allowed %prec sym where sym was a nonterminal.
 784
 785 AT_DATA([input.y],
 786 [[%%
 787 start: PREC %prec PREC ;
 788 PREC: ;
 789 ]])
 790
 791 AT_BISON_CHECK([input.y], [1], [],
 792 [[input.y:3.1-4: rule given for PREC, which is a token
 793 ]])
 794
 795 AT_CLEANUP
 796
 797
 798 ## ------------------------------- ##
 799 ## %prec's token must be defined.  ##
 800 ## ------------------------------- ##
 801
 802 AT_SETUP([[%prec's token must be defined]])
 803
 804 # According to POSIX, a %prec token must be defined separately.
 805
 806 AT_DATA([[input.y]],
 807 [[%%
 808 start: %prec PREC ;
 809 ]])
 810
 811 AT_BISON_CHECK([[input.y]], [[0]], [],
 812 [[input.y:2.8-17: warning: token for %prec is not defined: PREC
 813 ]])
 814
 815 AT_CLEANUP
 816
 817
 818 ## -------------------------------- ##
 819 ## Reject unused %code qualifiers.  ##
 820 ## -------------------------------- ##
 821
 822 AT_SETUP([Reject unused %code qualifiers])
 823
 824 AT_DATA([input-c.y],
 825 [[%code q {}
 826 %code bad {}
 827 %code bad {}
 828 %code format {}
 829 %%
 830 start: ;
 831 ]])
 832 AT_BISON_CHECK([[input-c.y]], [[1]], [],
 833 [[input-c.y:1.7: %code qualifier `q' is not used
 834 input-c.y:2.7-9: %code qualifier `bad' is not used
 835 input-c.y:3.7-9: %code qualifier `bad' is not used
 836 input-c.y:4.7-12: %code qualifier `format' is not used
 837 ]])
 838
 839 AT_DATA([input-c-glr.y],
 840 [[%code q {}
 841 %code bad {}
 842  %code bad {}
 843 %%
 844 start: ;
 845 ]])
 846 AT_BISON_CHECK([[input-c-glr.y]], [[1]], [],
 847 [[input-c-glr.y:1.7: %code qualifier `q' is not used
 848 input-c-glr.y:2.7-9: %code qualifier `bad' is not used
 849 input-c-glr.y:3.8-10: %code qualifier `bad' is not used
 850 ]])
 851
 852 AT_DATA([input-c++.y],
 853 [[%code q {}
 854 %code bad {}
 855  %code q {}
 856 %%
 857 start: ;
 858 ]])
 859 AT_BISON_CHECK([[input-c++.y]], [[1]], [],
 860 [[input-c++.y:1.7: %code qualifier `q' is not used
 861 input-c++.y:2.7-9: %code qualifier `bad' is not used
 862 input-c++.y:3.8: %code qualifier `q' is not used
 863 ]])
 864
 865 AT_DATA([input-c++-glr.y],
 866 [[%code bad {}
 867 %code q {}
 868 %code q {}
 869 %%
 870 start: ;
 871 ]])
 872 AT_BISON_CHECK([[input-c++-glr.y]], [[1]], [],
 873 [[input-c++-glr.y:1.7-9: %code qualifier `bad' is not used
 874 input-c++-glr.y:2.7: %code qualifier `q' is not used
 875 input-c++-glr.y:3.7: %code qualifier `q' is not used
 876 ]])
 877
 878 AT_DATA([special-char-@@.y],
 879 [[%code bad {}
 880 %code q {}
 881 %code q {}
 882 %%
 883 start: ;
 884 ]])
 885 AT_BISON_CHECK([[special-char-@@.y]], [[1]], [],
 886 [[special-char-@@.y:1.7-9: %code qualifier `bad' is not used
 887 special-char-@@.y:2.7: %code qualifier `q' is not used
 888 special-char-@@.y:3.7: %code qualifier `q' is not used
 889 ]])
 890
 891 AT_DATA([special-char-@:>@.y],
 892 [[%code bad {}
 893 %code q {}
 894 %code q {}
 895 %%
 896 start: ;
 897 ]])
 898 AT_BISON_CHECK([[special-char-@:>@.y]], [[1]], [],
 899 [[special-char-@:>@.y:1.7-9: %code qualifier `bad' is not used
 900 special-char-@:>@.y:2.7: %code qualifier `q' is not used
 901 special-char-@:>@.y:3.7: %code qualifier `q' is not used
 902 ]])
 903
 904 AT_CLEANUP
 905
 906
 907 ## ---------------- ##
 908 ## %define errors.  ##
 909 ## ---------------- ##
 910
 911 AT_SETUP([%define errors])
 912
 913 AT_DATA([input-redefined.y],
 914 [[%define var "value1"
 915 %define var "value1"
 916  %define var "value2"
 917 %define special1 "@:>@"
 918 %define special2 "@<:@"
 919 %%
 920 start: ;
 921 ]])
 922
 923 AT_BISON_CHECK([[input-redefined.y]], [[1]], [],
 924 [[input-redefined.y:2.9-11: %define variable `var' redefined
 925 input-redefined.y:1.9-11: previous definition
 926 input-redefined.y:3.10-12: %define variable `var' redefined
 927 input-redefined.y:2.9-11: previous definition
 928 ]])
 929
 930 AT_DATA([input-unused.y],
 931 [[%define var "value"
 932 %%
 933 start: ;
 934 ]])
 935
 936 AT_BISON_CHECK([[input-unused.y]], [[1]], [],
 937 [[input-unused.y:1.9-11: %define variable `var' is not used
 938 ]])
 939
 940 AT_CLEANUP
 941
 942
 943 ## ----------------------------------- ##
 944 ## %define, --define, --force-define.  ##
 945 ## ----------------------------------- ##
 946
 947 AT_SETUP([[%define, --define, --force-define]])
 948
 949 AT_DATA([[skel.c]],
 950 [[m4@&t@_divert_push(0)@
 951 @output(b4_parser_file_name@)@
 952 [var-dd: ]b4_percent_define_get([[var-dd]])[
 953 var-ff: ]b4_percent_define_get([[var-ff]])[
 954 var-dfg: ]b4_percent_define_get([[var-dfg]])[
 955 var-fd: ]b4_percent_define_get([[var-fd]])
 956 m4@&t@_divert_pop(0)
 957 ]])
 958 AT_DATA([[input.y]],
 959 [[%define var-dfg "gram"
 960 %%
 961 start: ;
 962 ]])
 963 AT_BISON_CHECK([[-Dvar-dd=cmd-d1 -Dvar-dd=cmd-d2 \
 964                  -Fvar-ff=cmd-f1 -Fvar-ff=cmd-f2 \
 965                  -Dvar-dfg=cmd-d -Fvar-dfg=cmd-f \
 966                  -Fvar-fd=cmd-f -Dvar-fd=cmd-d   \
 967                  --skeleton ./skel.c input.y]])
 968 AT_CHECK([[cat input.tab.c]], [[0]],
 969 [[var-dd: cmd-d2
 970 var-ff: cmd-f2
 971 var-dfg: cmd-f
 972 var-fd: cmd-d
 973 ]])
 974
 975 AT_DATA([[input-dg.y]],
 976 [[%define var "gram"
 977 %%
 978 start: ;
 979 ]])
 980 AT_BISON_CHECK([[-Dvar=cmd-d input-dg.y]], [[1]], [],
 981 [[input-dg.y:1.9-11: %define variable `var' redefined
 982 <command line>:2: previous definition
 983 ]])
 984
 985 AT_DATA([[input-unused.y]],
 986 [[%%
 987 start: ;
 988 ]])
 989 AT_BISON_CHECK([[-Dunused-d -Funused-f input-unused.y]], [[1]], [],
 990 [[<command line>:2: %define variable `unused-d' is not used
 991 <command line>:3: %define variable `unused-f' is not used
 992 ]])
 993
 994 AT_CLEANUP
 995
 996 ## --------------------------- ##
 997 ## %define Boolean variables.  ##
 998 ## --------------------------- ##
 999
1000 AT_SETUP([[%define Boolean variables]])
1001
1002 AT_DATA([Input.y],
1003 [[%language "Java"
1004 %define public "maybe"
1005 %define parser_class_name "Input"
1006 %%
1007 start: ;
1008 ]])
1009
1010 AT_BISON_CHECK([[Input.y]], [1], [],
1011 [[Input.y:2.9-14: invalid value for %define Boolean variable `public'
1012 ]])
1013
1014 AT_CLEANUP
1015
1016 ## ------------------------ ##
1017 ## %define enum variables.  ##
1018 ## ------------------------ ##
1019
1020 AT_SETUP([[%define enum variables]])
1021
1022 # Front-end.
1023 AT_DATA([[input.y]],
1024 [[%define lr.default-reductions bogus
1025 %%
1026 start: ;
1027 ]])
1028 AT_BISON_CHECK([[input.y]], [[1]], [[]],
1029 [[input.y:1.9-29: invalid value for %define variable `lr.default-reductions': `bogus'
1030 input.y:1.9-29: accepted value: `all'
1031 input.y:1.9-29: accepted value: `consistent'
1032 input.y:1.9-29: accepted value: `accepting'
1033 ]])
1034
1035 # Back-end.
1036 AT_DATA([[input.y]],
1037 [[%define api.push-pull neither
1038 %%
1039 start: ;
1040 ]])
1041 AT_BISON_CHECK([[input.y]], [1], [],
1042 [[input.y:1.9-21: invalid value for %define variable `api.push-pull': `neither'
1043 input.y:1.9-21: accepted value: `pull'
1044 input.y:1.9-21: accepted value: `push'
1045 input.y:1.9-21: accepted value: `both'
1046 ]])
1047
1048 AT_CLEANUP
1049
1050 ## -------------------------------- ##
1051 ## %define backward compatibility.  ##
1052 ## -------------------------------- ##
1053
1054 AT_SETUP([[%define backward compatibility]])
1055
1056 # The error messages tell us whether underscores in these variables are
1057 # being converted to dashes.
1058
1059 AT_DATA([[input.y]],
1060 [[%define api.push_pull "neither"
1061 %%
1062 start: ;
1063 ]])
1064 AT_BISON_CHECK([[input.y]], [1], [],
1065 [[input.y:1.9-21: invalid value for %define variable `api.push-pull': `neither'
1066 input.y:1.9-21: accepted value: `pull'
1067 input.y:1.9-21: accepted value: `push'
1068 input.y:1.9-21: accepted value: `both'
1069 ]])
1070
1071 AT_DATA([[input.y]],
1072 [[%define lr.keep_unreachable_states maybe
1073 %%
1074 start: ;
1075 ]])
1076 AT_BISON_CHECK([[input.y]], [1], [],
1077 [[input.y:1.9-34: invalid value for %define Boolean variable `lr.keep-unreachable-states'
1078 ]])
1079
1080 AT_DATA([[input.y]],
1081 [[%define namespace "foo"
1082 %define api.namespace "foo"
1083 %%
1084 start: ;
1085 ]])
1086 AT_BISON_CHECK([[input.y]], [1], [],
1087 [[input.y:2.9-21: %define variable `api.namespace' redefined
1088 input.y:1.9-17: previous definition
1089 ]])
1090
1091 AT_DATA([[input.y]],
1092 [[%define foo_bar "baz"
1093 %%
1094 start: ;
1095 ]])
1096 AT_BISON_CHECK([[input.y]], [[1]], [],
1097 [[input.y:1.9-15: %define variable `foo_bar' is not used
1098 ]])
1099
1100 AT_CLEANUP
1101
1102 ## ------------------------- ##
1103 ## Unused %define api.pure.  ##
1104 ## ------------------------- ##
1105
1106 AT_SETUP([[Unused %define api.pure]])
1107
1108 # AT_CHECK_API_PURE(DECLS, VALUE)
1109 # -------------------------------
1110 # Make sure Bison reports that `%define api.pure VALUE' is unused when DECLS
1111 # are specified.
1112 m4_define([AT_CHECK_API_PURE],
1113 [
1114 AT_DATA([[input.y]],
1115 [[%define api.pure ]$2[
1116 ]$1[
1117 %%
1118 start: ;
1119 ]])
1120
1121 AT_BISON_CHECK([[input.y]], [[1]], [],
1122 [[input.y:1.9-16: %define variable `api.pure' is not used
1123 ]])
1124 ])
1125
1126 AT_CHECK_API_PURE([[%language "c++" %defines]], [[]])
1127 AT_CHECK_API_PURE([[%language "c++" %defines]], [[false]])
1128 AT_CHECK_API_PURE([[%language "c++" %defines %glr-parser]], [[""]])
1129 AT_CHECK_API_PURE([[%language "c++" %defines %glr-parser]], [[false]])
1130 AT_CHECK_API_PURE([[%language "java"]], [[true]])
1131 AT_CHECK_API_PURE([[%language "java"]], [[false]])
1132
1133 AT_CLEANUP
1134
1135 ## -------------------------------- ##
1136 ## C++ namespace reference errors.  ##
1137 ## -------------------------------- ##
1138
1139 AT_SETUP([[C++ namespace reference errors]])
1140
1141 # AT_CHECK_NAMESPACE_ERROR(NAMESPACE-DECL, ERROR, [ERROR], ...)
1142 # -------------------------------------------------------------
1143 # Make sure Bison reports all ERROR's for %define namespace "NAMESPACE-DECL".
1144 m4_define([AT_CHECK_NAMESPACE_ERROR],
1145 [
1146 AT_DATA([[input.y]],
1147 [[%language "C++"
1148 %defines
1149 %define api.namespace "]$1["
1150 %%
1151 start: ;
1152 ]])
1153
1154 AT_BISON_CHECK([[input.y]], [1], [],
1155 [m4_foreach([b4_arg], m4_dquote(m4_shift($@)),
1156 [[input.y:3.9-21: ]b4_arg[
1157 ]])])
1158 ])
1159
1160 AT_CHECK_NAMESPACE_ERROR([[]],
1161                          [[namespace reference is empty]])
1162 AT_CHECK_NAMESPACE_ERROR([[                             ]],
1163                          [[namespace reference is empty]])
1164 AT_CHECK_NAMESPACE_ERROR([[foo::::bar]],
1165                          [[namespace reference has consecutive "::"]])
1166 AT_CHECK_NAMESPACE_ERROR([[foo::        ::bar]],
1167                          [[namespace reference has consecutive "::"]])
1168 AT_CHECK_NAMESPACE_ERROR([[::::bar]],
1169                          [[namespace reference has consecutive "::"]])
1170 AT_CHECK_NAMESPACE_ERROR([[:: ::bar]],
1171                          [[namespace reference has consecutive "::"]])
1172 AT_CHECK_NAMESPACE_ERROR([[foo::bar::   ::]],
1173                          [[namespace reference has consecutive "::"]],
1174                          [[namespace reference has a trailing "::"]])
1175 AT_CHECK_NAMESPACE_ERROR([[foo::bar::]],
1176                          [[namespace reference has a trailing "::"]])
1177 AT_CHECK_NAMESPACE_ERROR([[foo::bar::   ]],
1178                          [[namespace reference has a trailing "::"]])
1179 AT_CHECK_NAMESPACE_ERROR([[::]],
1180                          [[namespace reference has a trailing "::"]])
1181
1182 AT_CLEANUP
1183
1184 ## ------------------------ ##
1185 ## Bad character literals.  ##
1186 ## ------------------------ ##
1187
1188 # Bison used to accept character literals that were empty or contained
1189 # too many characters.
1190
1191 # FIXME: AT_DATA or some variant of AT_DATA may eventually permit
1192 # the final newline to be omitted.  See the threads starting at
1193 # <http://lists.gnu.org/archive/html/bison-patches/2009-07/msg00019.html>.
1194
1195 AT_SETUP([[Bad character literals]])
1196
1197 AT_DATA([empty.y],
1198 [[%%
1199 start: '';
1200 start: '
1201 ]])
1202 AT_CHECK([[perl -e "print 'start: \'';" >> empty.y || exit 77]])
1203
1204 AT_BISON_CHECK([empty.y], [1], [],
1205 [[empty.y:2.8-9: warning: empty character literal
1206 empty.y:3.8-4.0: warning: empty character literal
1207 empty.y:3.8-4.0: missing `'' at end of line
1208 empty.y:4.8: warning: empty character literal
1209 empty.y:4.8: missing `'' at end of file
1210 ]])
1211
1212 AT_DATA([two.y],
1213 [[%%
1214 start: 'ab';
1215 start: 'ab
1216 ]])
1217 AT_CHECK([[perl -e "print 'start: \'ab';" >> two.y || exit 77]])
1218
1219 AT_BISON_CHECK([two.y], [1], [],
1220 [[two.y:2.8-11: warning: extra characters in character literal
1221 two.y:3.8-4.0: warning: extra characters in character literal
1222 two.y:3.8-4.0: missing `'' at end of line
1223 two.y:4.8-10: warning: extra characters in character literal
1224 two.y:4.8-10: missing `'' at end of file
1225 ]])
1226
1227 AT_DATA([three.y],
1228 [[%%
1229 start: 'abc';
1230 start: 'abc
1231 ]])
1232 AT_CHECK([[perl -e "print 'start: \'abc';" >> three.y || exit 77]])
1233
1234 AT_BISON_CHECK([three.y], [1], [],
1235 [[three.y:2.8-12: warning: extra characters in character literal
1236 three.y:3.8-4.0: warning: extra characters in character literal
1237 three.y:3.8-4.0: missing `'' at end of line
1238 three.y:4.8-11: warning: extra characters in character literal
1239 three.y:4.8-11: missing `'' at end of file
1240 ]])
1241
1242 AT_CLEANUP
1243
1244 ## ------------------------- ##
1245 ## Bad escapes in literals.  ##
1246 ## ------------------------- ##
1247
1248 AT_SETUP([[Bad escapes in literals]])
1249
1250 AT_DATA([input.y],
1251 [[%%
1252 start: '\777' '\0' '\xfff' '\x0'
1253        '\uffff' '\u0000' '\Uffffffff' '\U00000000'
1254        '\ ' '\A';
1255 ]])
1256
1257 # It is not easy to create special characters, we cannot even trust tr.
1258 # Beside we cannot even expect "echo '\0'" to output two characters
1259 # (well three with \n): at least Bash 3.2 converts the two-character
1260 # sequence "\0" into a single NUL character.
1261 AT_CHECK([[perl -e 'print "start: \"\\\t\\\f\\\0\\\1\" ;";' >> input.y \
1262            || exit 77]])
1263
1264 AT_BISON_CHECK([input.y], [1], [],
1265 [[input.y:2.9-12: invalid number after \-escape: 777
1266 input.y:2.8-13: warning: empty character literal
1267 input.y:2.16-17: invalid number after \-escape: 0
1268 input.y:2.15-18: warning: empty character literal
1269 input.y:2.21-25: invalid number after \-escape: xfff
1270 input.y:2.20-26: warning: empty character literal
1271 input.y:2.29-31: invalid number after \-escape: x0
1272 input.y:2.28-32: warning: empty character literal
1273 input.y:3.9-14: invalid number after \-escape: uffff
1274 input.y:3.8-15: warning: empty character literal
1275 input.y:3.18-23: invalid number after \-escape: u0000
1276 input.y:3.17-24: warning: empty character literal
1277 input.y:3.27-36: invalid number after \-escape: Uffffffff
1278 input.y:3.26-37: warning: empty character literal
1279 input.y:3.40-49: invalid number after \-escape: U00000000
1280 input.y:3.39-50: warning: empty character literal
1281 input.y:4.9-10: invalid character after \-escape: ` '
1282 input.y:4.8-11: warning: empty character literal
1283 input.y:4.14-15: invalid character after \-escape: A
1284 input.y:4.13-16: warning: empty character literal
1285 input.y:5.9-16: invalid character after \-escape: \t
1286 input.y:5.17: invalid character after \-escape: \f
1287 input.y:5.18: invalid character after \-escape: \0
1288 input.y:5.19: invalid character after \-escape: \001
1289 ]])
1290
1291 AT_CLEANUP
1292
1293 ## ------------------------- ##
1294 ## LAC: Errors for %define.  ##
1295 ## ------------------------- ##
1296
1297 AT_SETUP([[LAC: Errors for %define]])
1298
1299 AT_DATA([[input.y]],
1300 [[%%
1301 start: ;
1302 ]])
1303
1304 # parse.lac.* options are useless if LAC isn't actually activated.
1305 AT_BISON_CHECK([[-Dparse.lac.es-capacity-initial=1 input.y]],
1306                [[1]], [],
1307 [[<command line>:2: %define variable `parse.lac.es-capacity-initial' is not used
1308 ]])
1309
1310 AT_CLEANUP