gcc/fortran/options.c

   1 /* Parse and display command line options.
   2    Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
   3    Free Software Foundation, Inc.
   4    Contributed by Andy Vaught
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 3, or (at your option) any later
  11 version.
  12
  13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  21
  22 #include "config.h"
  23 #include "system.h"
  24 #include "coretypes.h"
  25 #include "tree.h"
  26 #include "flags.h"
  27 #include "intl.h"
  28 #include "opts.h"
  29 #include "options.h"
  30 #include "params.h"
  31 #include "tree-inline.h"
  32 #include "gfortran.h"
  33 #include "target.h"
  34
  35 gfc_option_t gfc_option;
  36
  37
  38 /* Set flags that control warnings and errors for different
  39    Fortran standards to their default values.  */
  40
  41 static void
  42 set_default_std_flags (void)
  43 {
  44   gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL
  45     | GFC_STD_F2003 | GFC_STD_F95 | GFC_STD_F77 | GFC_STD_GNU
  46     | GFC_STD_LEGACY;
  47   gfc_option.warn_std = GFC_STD_F95_DEL | GFC_STD_LEGACY;
  48 }
  49
  50 /* Get ready for options handling.  */
  51
  52 unsigned int
  53 gfc_init_options (unsigned int argc ATTRIBUTE_UNUSED,
  54                   const char **argv ATTRIBUTE_UNUSED)
  55 {
  56   gfc_source_file = NULL;
  57   gfc_option.module_dir = NULL;
  58   gfc_option.source_form = FORM_UNKNOWN;
  59   gfc_option.fixed_line_length = 72;
  60   gfc_option.free_line_length = 132;
  61   gfc_option.max_continue_fixed = 19;
  62   gfc_option.max_continue_free = 39;
  63   gfc_option.max_identifier_length = GFC_MAX_SYMBOL_LEN;
  64   gfc_option.max_subrecord_length = 0;
  65   gfc_option.convert = GFC_CONVERT_NATIVE;
  66   gfc_option.record_marker = 0;
  67   gfc_option.verbose = 0;
  68
  69   gfc_option.warn_aliasing = 0;
  70   gfc_option.warn_ampersand = 0;
  71   gfc_option.warn_character_truncation = 0;
  72   gfc_option.warn_conversion = 0;
  73   gfc_option.warn_implicit_interface = 0;
  74   gfc_option.warn_line_truncation = 0;
  75   gfc_option.warn_surprising = 0;
  76   gfc_option.warn_tabs = 1;
  77   gfc_option.warn_underflow = 1;
  78   gfc_option.max_errors = 25;
  79
  80   gfc_option.flag_all_intrinsics = 0;
  81   gfc_option.flag_default_double = 0;
  82   gfc_option.flag_default_integer = 0;
  83   gfc_option.flag_default_real = 0;
  84   gfc_option.flag_dollar_ok = 0;
  85   gfc_option.flag_underscoring = 1;
  86   gfc_option.flag_f2c = 0;
  87   gfc_option.flag_second_underscore = -1;
  88   gfc_option.flag_implicit_none = 0;
  89
  90   /* Default value of flag_max_stack_var_size is set in gfc_post_options.  */
  91   gfc_option.flag_max_stack_var_size = -2;
  92
  93   gfc_option.flag_range_check = 1;
  94   gfc_option.flag_pack_derived = 0;
  95   gfc_option.flag_repack_arrays = 0;
  96   gfc_option.flag_preprocessed = 0;
  97   gfc_option.flag_automatic = 1;
  98   gfc_option.flag_backslash = 1;
  99   gfc_option.flag_module_private = 0;
 100   gfc_option.flag_backtrace = 0;
 101   gfc_option.flag_allow_leading_underscore = 0;
 102   gfc_option.flag_dump_core = 0;
 103   gfc_option.flag_external_blas = 0;
 104   gfc_option.blas_matmul_limit = 30;
 105   gfc_option.flag_cray_pointer = 0;
 106   gfc_option.flag_d_lines = -1;
 107   gfc_option.flag_openmp = 0;
 108   gfc_option.flag_sign_zero = 1;
 109   gfc_option.flag_recursive = 0;
 110
 111   gfc_option.fpe = 0;
 112
 113   /* Argument pointers cannot point to anything but their argument.  */
 114   flag_argument_noalias = 3;
 115
 116   flag_errno_math = 0;
 117
 118   set_default_std_flags ();
 119
 120   gfc_option.warn_nonstd_intrinsics = 0;
 121
 122   /* -fshort-enums can be default on some targets.  */
 123   gfc_option.fshort_enums = targetm.default_short_enums ();
 124
 125   return CL_Fortran;
 126 }
 127
 128
 129 /* Determine the source form from the filename extension.  We assume
 130    case insensitivity.  */
 131
 132 static gfc_source_form
 133 form_from_filename (const char *filename)
 134 {
 135   static const struct
 136   {
 137     const char *extension;
 138     gfc_source_form form;
 139   }
 140   exttype[] =
 141   {
 142     {
 143     ".f90", FORM_FREE}
 144     ,
 145     {
 146     ".f95", FORM_FREE}
 147     ,
 148     {
 149     ".f03", FORM_FREE}
 150     ,
 151     {
 152     ".f", FORM_FIXED}
 153     ,
 154     {
 155     ".for", FORM_FIXED}
 156     ,
 157     {
 158     "", FORM_UNKNOWN}
 159   };            /* sentinel value */
 160
 161   gfc_source_form f_form;
 162   const char *fileext;
 163   int i;
 164
 165   /* Find end of file name.  Note, filename is either a NULL pointer or
 166      a NUL terminated string.  */
 167   i = 0;
 168   while (filename[i] != '\0')
 169     i++;
 170
 171   /* Find last period.  */
 172   while (i >= 0 && (filename[i] != '.'))
 173     i--;
 174
 175   /* Did we see a file extension?  */
 176   if (i < 0)
 177     return FORM_UNKNOWN; /* Nope  */
 178
 179   /* Get file extension and compare it to others.  */
 180   fileext = &(filename[i]);
 181
 182   i = -1;
 183   f_form = FORM_UNKNOWN;
 184   do
 185     {
 186       i++;
 187       if (strcasecmp (fileext, exttype[i].extension) == 0)
 188         {
 189           f_form = exttype[i].form;
 190           break;
 191         }
 192     }
 193   while (exttype[i].form != FORM_UNKNOWN);
 194
 195   return f_form;
 196 }
 197
 198
 199 /* Finalize commandline options.  */
 200
 201 bool
 202 gfc_post_options (const char **pfilename)
 203 {
 204   const char *filename = *pfilename, *canon_source_file = NULL;
 205   char *source_path;
 206   int i;
 207
 208   /* Verify the input file name.  */
 209   if (!filename || strcmp (filename, "-") == 0)
 210     {
 211       filename = "";
 212     }
 213
 214   if (gfc_option.flag_preprocessed)
 215     {
 216       /* For preprocessed files, if the first tokens are of the form # NUM.
 217          handle the directives so we know the original file name.  */
 218       gfc_source_file = gfc_read_orig_filename (filename, &canon_source_file);
 219       if (gfc_source_file == NULL)
 220         gfc_source_file = filename;
 221       else
 222         *pfilename = gfc_source_file;
 223     }
 224   else
 225     gfc_source_file = filename;
 226
 227   if (canon_source_file == NULL)
 228     canon_source_file = gfc_source_file;
 229
 230   /* Adds the path where the source file is to the list of include files.  */
 231
 232   i = strlen (canon_source_file);
 233   while (i > 0 && !IS_DIR_SEPARATOR (canon_source_file[i]))
 234     i--;
 235
 236   if (i != 0)
 237     {
 238       source_path = alloca (i + 1);
 239       memcpy (source_path, canon_source_file, i);
 240       source_path[i] = 0;
 241       gfc_add_include_path (source_path, true);
 242     }
 243   else
 244     gfc_add_include_path (".", true);
 245
 246   if (canon_source_file != gfc_source_file)
 247     gfc_free (CONST_CAST (canon_source_file));
 248
 249   /* Decide which form the file will be read in as.  */
 250
 251   if (gfc_option.source_form != FORM_UNKNOWN)
 252     gfc_current_form = gfc_option.source_form;
 253   else
 254     {
 255       gfc_current_form = form_from_filename (filename);
 256
 257       if (gfc_current_form == FORM_UNKNOWN)
 258         {
 259           gfc_current_form = FORM_FREE;
 260           gfc_warning_now ("Reading file '%s' as free form",
 261                            (filename[0] == '\0') ? "<stdin>" : filename);
 262         }
 263     }
 264
 265   /* If the user specified -fd-lines-as-{code|comments} verify that we're
 266      in fixed form.  */
 267   if (gfc_current_form == FORM_FREE)
 268     {
 269       if (gfc_option.flag_d_lines == 0)
 270         gfc_warning_now ("'-fd-lines-as-comments' has no effect "
 271                          "in free form");
 272       else if (gfc_option.flag_d_lines == 1)
 273         gfc_warning_now ("'-fd-lines-as-code' has no effect in free form");
 274     }
 275
 276   flag_inline_trees = 1;
 277
 278   /* Use tree inlining.  */
 279   if (!flag_no_inline)
 280     flag_no_inline = 1;
 281   if (flag_inline_functions)
 282     flag_inline_trees = 2;
 283
 284   /* If -pedantic, warn about the use of GNU extensions.  */
 285   if (pedantic && (gfc_option.allow_std & GFC_STD_GNU) != 0)
 286     gfc_option.warn_std |= GFC_STD_GNU;
 287   /* -std=legacy -pedantic is effectively -std=gnu.  */
 288   if (pedantic && (gfc_option.allow_std & GFC_STD_LEGACY) != 0)
 289     gfc_option.warn_std |= GFC_STD_F95_OBS | GFC_STD_F95_DEL | GFC_STD_LEGACY;
 290
 291   /* If the user didn't explicitly specify -f(no)-second-underscore we
 292      use it if we're trying to be compatible with f2c, and not
 293      otherwise.  */
 294   if (gfc_option.flag_second_underscore == -1)
 295     gfc_option.flag_second_underscore = gfc_option.flag_f2c;
 296
 297   if (!gfc_option.flag_automatic && gfc_option.flag_max_stack_var_size != -2
 298       && gfc_option.flag_max_stack_var_size != 0)
 299     gfc_warning_now ("Flag -fno-automatic overwrites -fmax-stack-var-size=%d",
 300                      gfc_option.flag_max_stack_var_size);
 301   else if (!gfc_option.flag_automatic && gfc_option.flag_recursive)
 302     gfc_warning_now ("Flag -fno-automatic overwrites -frecursive");
 303   else if (!gfc_option.flag_automatic && gfc_option.flag_openmp)
 304     gfc_warning_now ("Flag -fno-automatic overwrites -frecursive implied by "
 305                      "-fopenmp");
 306   else if (gfc_option.flag_max_stack_var_size != -2
 307            && gfc_option.flag_recursive)
 308     gfc_warning_now ("Flag -frecursive overwrites -fmax-stack-var-size=%d",
 309                      gfc_option.flag_max_stack_var_size);
 310   else if (gfc_option.flag_max_stack_var_size != -2
 311            && gfc_option.flag_openmp)
 312     gfc_warning_now ("Flag -fmax-stack-var-size=%d overwrites -frecursive "
 313                      "implied by -fopenmp",
 314                      gfc_option.flag_max_stack_var_size);
 315
 316   /* Implied -frecursive; implemented as -fmax-stack-var-size=-1.  */
 317   if (gfc_option.flag_max_stack_var_size == -2 && gfc_option.flag_openmp)
 318     gfc_option.flag_max_stack_var_size = -1;
 319
 320   /* Set default.  */
 321   if (gfc_option.flag_max_stack_var_size == -2)
 322     gfc_option.flag_max_stack_var_size = 32768;
 323
 324   /* Implement -frecursive as -fmax-stack-var-size=-1.  */
 325   if (gfc_option.flag_recursive)
 326     gfc_option.flag_max_stack_var_size = -1;
 327
 328   /* Implement -fno-automatic as -fmax-stack-var-size=0.  */
 329   if (!gfc_option.flag_automatic)
 330     gfc_option.flag_max_stack_var_size = 0;
 331
 332   if (pedantic)
 333     {
 334       gfc_option.warn_ampersand = 1;
 335       gfc_option.warn_tabs = 0;
 336     }
 337
 338   if (gfc_option.flag_all_intrinsics)
 339     gfc_option.warn_nonstd_intrinsics = 0;
 340
 341   return false;
 342 }
 343
 344
 345 /* Set the options for -Wall.  */
 346
 347 static void
 348 set_Wall (int setting)
 349 {
 350   gfc_option.warn_aliasing = setting;
 351   gfc_option.warn_ampersand = setting;
 352   gfc_option.warn_line_truncation = setting;
 353   gfc_option.warn_nonstd_intrinsics = setting;
 354   gfc_option.warn_surprising = setting;
 355   gfc_option.warn_tabs = !setting;
 356   gfc_option.warn_underflow = setting;
 357   gfc_option.warn_character_truncation = setting;
 358
 359   set_Wunused (setting);
 360   warn_return_type = setting;
 361   warn_switch = setting;
 362
 363   /* We save the value of warn_uninitialized, since if they put
 364      -Wuninitialized on the command line, we need to generate a
 365      warning about not using it without also specifying -O.  */
 366   if (setting == 0)
 367     warn_uninitialized = 0;
 368   else if (warn_uninitialized != 1)
 369     warn_uninitialized = 2;
 370 }
 371
 372
 373 static void
 374 gfc_handle_module_path_options (const char *arg)
 375 {
 376
 377   if (gfc_option.module_dir != NULL)
 378     {
 379       gfc_status ("gfortran: Only one -M option allowed\n");
 380       exit (3);
 381     }
 382
 383   if (arg == NULL)
 384     {
 385       gfc_status ("gfortran: Directory required after -M\n");
 386       exit (3);
 387     }
 388
 389   gfc_option.module_dir = (char *) gfc_getmem (strlen (arg) + 2);
 390   strcpy (gfc_option.module_dir, arg);
 391   strcat (gfc_option.module_dir, "/");
 392
 393   gfc_add_include_path (gfc_option.module_dir, true);
 394 }
 395
 396
 397 static void
 398 gfc_handle_fpe_trap_option (const char *arg)
 399 {
 400   int result, pos = 0, n;
 401   static const char * const exception[] = { "invalid", "denormal", "zero",
 402                                             "overflow", "underflow",
 403                                             "precision", NULL };
 404   static const int opt_exception[] = { GFC_FPE_INVALID, GFC_FPE_DENORMAL,
 405                                        GFC_FPE_ZERO, GFC_FPE_OVERFLOW,
 406                                        GFC_FPE_UNDERFLOW, GFC_FPE_PRECISION,
 407                                        0 };
 408
 409   while (*arg)
 410     {
 411       while (*arg == ',')
 412         arg++;
 413
 414       while (arg[pos] && arg[pos] != ',')
 415         pos++;
 416
 417       result = 0;
 418       for (n = 0; exception[n] != NULL; n++)
 419         {
 420           if (exception[n] && strncmp (exception[n], arg, pos) == 0)
 421             {
 422               gfc_option.fpe |= opt_exception[n];
 423               arg += pos;
 424               pos = 0;
 425               result = 1;
 426               break;
 427             }
 428         }
 429       if (!result)
 430         gfc_fatal_error ("Argument to -ffpe-trap is not valid: %s", arg);
 431     }
 432 }
 433
 434
 435 /* Handle command-line options.  Returns 0 if unrecognized, 1 if
 436    recognized and handled.  */
 437
 438 int
 439 gfc_handle_option (size_t scode, const char *arg, int value)
 440 {
 441   int result = 1;
 442   enum opt_code code = (enum opt_code) scode;
 443
 444   /* Ignore file names.  */
 445   if (code == N_OPTS)
 446     return 1;
 447
 448   switch (code)
 449     {
 450     default:
 451       result = 0;
 452       break;
 453
 454     case OPT_Wall:
 455       set_Wall (value);
 456       break;
 457
 458     case OPT_Waliasing:
 459       gfc_option.warn_aliasing = value;
 460       break;
 461
 462     case OPT_Wampersand:
 463       gfc_option.warn_ampersand = value;
 464       break;
 465
 466     case OPT_Wcharacter_truncation:
 467       gfc_option.warn_character_truncation = value;
 468       break;
 469
 470     case OPT_Wconversion:
 471       gfc_option.warn_conversion = value;
 472       break;
 473
 474     case OPT_Wimplicit_interface:
 475       gfc_option.warn_implicit_interface = value;
 476       break;
 477
 478     case OPT_Wline_truncation:
 479       gfc_option.warn_line_truncation = value;
 480       break;
 481
 482     case OPT_Wsurprising:
 483       gfc_option.warn_surprising = value;
 484       break;
 485
 486     case OPT_Wtabs:
 487       gfc_option.warn_tabs = value;
 488       break;
 489
 490     case OPT_Wunderflow:
 491       gfc_option.warn_underflow = value;
 492       break;
 493
 494     case OPT_fall_intrinsics:
 495       gfc_option.flag_all_intrinsics = 1;
 496       break;
 497
 498     case OPT_fautomatic:
 499       gfc_option.flag_automatic = value;
 500       break;
 501
 502     case OPT_fallow_leading_underscore:
 503       gfc_option.flag_allow_leading_underscore = value;
 504       break;
 505
 506     case OPT_fbackslash:
 507       gfc_option.flag_backslash = value;
 508       break;
 509
 510     case OPT_fbacktrace:
 511       gfc_option.flag_backtrace = value;
 512       break;
 513
 514     case OPT_fdump_core:
 515       gfc_option.flag_dump_core = value;
 516       break;
 517
 518     case OPT_fcray_pointer:
 519       gfc_option.flag_cray_pointer = value;
 520       break;
 521
 522     case OPT_ff2c:
 523       gfc_option.flag_f2c = value;
 524       break;
 525
 526     case OPT_fdollar_ok:
 527       gfc_option.flag_dollar_ok = value;
 528       break;
 529
 530     case OPT_fexternal_blas:
 531       gfc_option.flag_external_blas = value;
 532       break;
 533
 534     case OPT_fblas_matmul_limit_:
 535       gfc_option.blas_matmul_limit = value;
 536       break;
 537
 538     case OPT_fd_lines_as_code:
 539       gfc_option.flag_d_lines = 1;
 540       break;
 541
 542     case OPT_fd_lines_as_comments:
 543       gfc_option.flag_d_lines = 0;
 544       break;
 545
 546     case OPT_fdump_parse_tree:
 547       gfc_option.verbose = value;
 548       break;
 549
 550     case OPT_ffixed_form:
 551       gfc_option.source_form = FORM_FIXED;
 552       break;
 553
 554     case OPT_ffixed_line_length_none:
 555       gfc_option.fixed_line_length = 0;
 556       break;
 557
 558     case OPT_ffixed_line_length_:
 559       if (value != 0 && value < 7)
 560         gfc_fatal_error ("Fixed line length must be at least seven.");
 561       gfc_option.fixed_line_length = value;
 562       break;
 563
 564     case OPT_ffree_form:
 565       gfc_option.source_form = FORM_FREE;
 566       break;
 567
 568     case OPT_fopenmp:
 569       gfc_option.flag_openmp = value;
 570       break;
 571
 572     case OPT_ffree_line_length_none:
 573       gfc_option.free_line_length = 0;
 574       break;
 575
 576     case OPT_ffree_line_length_:
 577       if (value != 0 && value < 4)
 578         gfc_fatal_error ("Free line length must be at least three.");
 579       gfc_option.free_line_length = value;
 580       break;
 581
 582     case OPT_funderscoring:
 583       gfc_option.flag_underscoring = value;
 584       break;
 585
 586     case OPT_fsecond_underscore:
 587       gfc_option.flag_second_underscore = value;
 588       break;
 589
 590     case OPT_static_libgfortran:
 591 #ifndef HAVE_LD_STATIC_DYNAMIC
 592       gfc_fatal_error ("-static-libgfortran is not supported in this "
 593                        "configuration");
 594 #endif
 595       break;
 596
 597     case OPT_fimplicit_none:
 598       gfc_option.flag_implicit_none = value;
 599       break;
 600
 601     case OPT_fintrinsic_modules_path:
 602       gfc_add_include_path (arg, false);
 603       gfc_add_intrinsic_modules_path (arg);
 604       break;
 605
 606     case OPT_fmax_errors_:
 607       gfc_option.max_errors = value;
 608       break;
 609
 610     case OPT_fmax_stack_var_size_:
 611       gfc_option.flag_max_stack_var_size = value;
 612       break;
 613
 614     case OPT_fmodule_private:
 615       gfc_option.flag_module_private = value;
 616       break;
 617
 618     case OPT_frange_check:
 619       gfc_option.flag_range_check = value;
 620       break;
 621
 622     case OPT_fpack_derived:
 623       gfc_option.flag_pack_derived = value;
 624       break;
 625
 626     case OPT_frepack_arrays:
 627       gfc_option.flag_repack_arrays = value;
 628       break;
 629
 630     case OPT_fpreprocessed:
 631       gfc_option.flag_preprocessed = value;
 632       break;
 633
 634     case OPT_fmax_identifier_length_:
 635       if (value > GFC_MAX_SYMBOL_LEN)
 636         gfc_fatal_error ("Maximum supported identifier length is %d",
 637                          GFC_MAX_SYMBOL_LEN);
 638       gfc_option.max_identifier_length = value;
 639       break;
 640
 641     case OPT_fdefault_integer_8:
 642       gfc_option.flag_default_integer = value;
 643       break;
 644
 645     case OPT_fdefault_real_8:
 646       gfc_option.flag_default_real = value;
 647       break;
 648
 649     case OPT_fdefault_double_8:
 650       gfc_option.flag_default_double = value;
 651       break;
 652
 653     case OPT_I:
 654       gfc_add_include_path (arg, true);
 655       break;
 656
 657     case OPT_J:
 658     case OPT_M:
 659       gfc_handle_module_path_options (arg);
 660       break;
 661
 662     case OPT_fsign_zero:
 663       gfc_option.flag_sign_zero = value;
 664       break;
 665
 666     case OPT_ffpe_trap_:
 667       gfc_handle_fpe_trap_option (arg);
 668       break;
 669
 670     case OPT_std_f95:
 671       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F95 | GFC_STD_F77;
 672       gfc_option.warn_std = GFC_STD_F95_OBS;
 673       gfc_option.max_identifier_length = 31;
 674       gfc_option.warn_ampersand = 1;
 675       gfc_option.warn_tabs = 0;
 676       break;
 677
 678     case OPT_std_f2003:
 679       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F77
 680         | GFC_STD_F2003 | GFC_STD_F95;
 681       gfc_option.warn_std = GFC_STD_F95_OBS;
 682       gfc_option.max_continue_fixed = 255;
 683       gfc_option.max_continue_free = 255;
 684       gfc_option.max_identifier_length = 63;
 685       gfc_option.warn_ampersand = 1;
 686       gfc_option.warn_tabs = 0;
 687       break;
 688
 689     case OPT_std_gnu:
 690       set_default_std_flags ();
 691       break;
 692
 693     case OPT_std_legacy:
 694       set_default_std_flags ();
 695       gfc_option.warn_std = 0;
 696       break;
 697
 698     case OPT_Wnonstd_intrinsics:
 699       gfc_option.warn_nonstd_intrinsics = value;
 700       break;
 701
 702     case OPT_fshort_enums:
 703       gfc_option.fshort_enums = 1;
 704       break;
 705
 706     case OPT_fconvert_little_endian:
 707       gfc_option.convert = GFC_CONVERT_LITTLE;
 708       break;
 709
 710     case OPT_fconvert_big_endian:
 711       gfc_option.convert = GFC_CONVERT_BIG;
 712       break;
 713
 714     case OPT_fconvert_native:
 715       gfc_option.convert = GFC_CONVERT_NATIVE;
 716       break;
 717
 718     case OPT_fconvert_swap:
 719       gfc_option.convert = GFC_CONVERT_SWAP;
 720       break;
 721
 722     case OPT_frecord_marker_4:
 723       gfc_option.record_marker = 4;
 724       break;
 725
 726     case OPT_frecord_marker_8:
 727       gfc_option.record_marker = 8;
 728       break;
 729
 730     case OPT_fmax_subrecord_length_:
 731       if (value > MAX_SUBRECORD_LENGTH)
 732         gfc_fatal_error ("Maximum subrecord length cannot exceed %d",
 733                          MAX_SUBRECORD_LENGTH);
 734
 735       gfc_option.max_subrecord_length = value;
 736       break;
 737
 738     case OPT_frecursive:
 739       gfc_option.flag_recursive = 1;
 740       break;
 741     }
 742
 743   return result;
 744 }