gcc/fortran/options.c

   1 /* Parse and display command line options.
   2    Copyright (C) 2000-2018 Free Software Foundation, Inc.
   3    Contributed by Andy Vaught
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 3, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 #include "config.h"
  22 #include "system.h"
  23 #include "coretypes.h"
  24 #include "target.h"
  25 #include "tree.h"
  26 #include "gfortran.h"
  27 #include "diagnostic.h" /* For global_dc.  */
  28 #include "opts.h"
  29 #include "toplev.h"  /* For save_decoded_options.  */
  30 #include "cpp.h"
  31 #include "langhooks.h"
  32
  33 gfc_option_t gfc_option;
  34
  35
  36 /* Set flags that control warnings and errors for different
  37    Fortran standards to their default values.  Keep in sync with
  38    libgfortran/runtime/compile_options.c (init_compile_options).  */
  39
  40 static void
  41 set_default_std_flags (void)
  42 {
  43   gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL
  44     | GFC_STD_F2003 | GFC_STD_F2008 | GFC_STD_F95 | GFC_STD_F77
  45     | GFC_STD_F2008_OBS | GFC_STD_F2008_TS | GFC_STD_GNU | GFC_STD_LEGACY
  46     | GFC_STD_F2018 | GFC_STD_F2018_DEL | GFC_STD_F2018_OBS;
  47   gfc_option.warn_std = GFC_STD_F95_DEL | GFC_STD_LEGACY;
  48 }
  49
  50
  51 /* Set all the DEC extension flags.  */
  52
  53 static void
  54 set_dec_flags (int value)
  55 {
  56   if (value)
  57     {
  58       /* Allow legacy code without warnings.  */
  59       gfc_option.allow_std |= GFC_STD_F95_OBS | GFC_STD_F95_DEL
  60         | GFC_STD_GNU | GFC_STD_LEGACY;
  61       gfc_option.warn_std &= ~(GFC_STD_LEGACY | GFC_STD_F95_DEL);
  62     }
  63
  64   /* Set other DEC compatibility extensions.  */
  65   flag_dollar_ok |= value;
  66   flag_cray_pointer |= value;
  67   flag_dec_structure |= value;
  68   flag_dec_intrinsic_ints |= value;
  69   flag_dec_static |= value;
  70   flag_dec_math |= value;
  71 }
  72
  73
  74 /* Return language mask for Fortran options.  */
  75
  76 unsigned int
  77 gfc_option_lang_mask (void)
  78 {
  79   return CL_Fortran;
  80 }
  81
  82 /* Initialize options structure OPTS.  */
  83
  84 void
  85 gfc_init_options_struct (struct gcc_options *opts)
  86 {
  87   opts->x_flag_errno_math = 0;
  88   opts->frontend_set_flag_errno_math = true;
  89   opts->x_flag_associative_math = -1;
  90   opts->frontend_set_flag_associative_math = true;
  91 }
  92
  93 /* Get ready for options handling. Keep in sync with
  94    libgfortran/runtime/compile_options.c (init_compile_options).  */
  95
  96 void
  97 gfc_init_options (unsigned int decoded_options_count,
  98                   struct cl_decoded_option *decoded_options)
  99 {
 100   gfc_source_file = NULL;
 101   gfc_option.module_dir = NULL;
 102   gfc_option.source_form = FORM_UNKNOWN;
 103   gfc_option.max_continue_fixed = 255;
 104   gfc_option.max_continue_free = 255;
 105   gfc_option.max_identifier_length = GFC_MAX_SYMBOL_LEN;
 106   gfc_option.max_errors = 25;
 107
 108   gfc_option.flag_preprocessed = 0;
 109   gfc_option.flag_d_lines = -1;
 110   gfc_option.flag_init_integer = GFC_INIT_INTEGER_OFF;
 111   gfc_option.flag_init_integer_value = 0;
 112   gfc_option.flag_init_logical = GFC_INIT_LOGICAL_OFF;
 113   gfc_option.flag_init_character = GFC_INIT_CHARACTER_OFF;
 114   gfc_option.flag_init_character_value = (char)0;
 115
 116   gfc_option.fpe = 0;
 117   /* All except GFC_FPE_INEXACT.  */
 118   gfc_option.fpe_summary = GFC_FPE_INVALID | GFC_FPE_DENORMAL
 119                            | GFC_FPE_ZERO | GFC_FPE_OVERFLOW
 120                            | GFC_FPE_UNDERFLOW;
 121   gfc_option.rtcheck = 0;
 122
 123   /* ??? Wmissing-include-dirs is disabled by default in C/C++ but
 124      enabled by default in Fortran.  Ideally, we should express this
 125      in .opt, but that is not supported yet.  */
 126   if (!global_options_set.x_cpp_warn_missing_include_dirs)
 127     global_options.x_cpp_warn_missing_include_dirs = 1;
 128
 129   set_dec_flags (0);
 130
 131   set_default_std_flags ();
 132
 133   /* Initialize cpp-related options.  */
 134   gfc_cpp_init_options (decoded_options_count, decoded_options);
 135   gfc_diagnostics_init ();
 136 }
 137
 138
 139 /* Determine the source form from the filename extension.  We assume
 140    case insensitivity.  */
 141
 142 static gfc_source_form
 143 form_from_filename (const char *filename)
 144 {
 145   static const struct
 146   {
 147     const char *extension;
 148     gfc_source_form form;
 149   }
 150   exttype[] =
 151   {
 152     {
 153     ".f90", FORM_FREE}
 154     ,
 155     {
 156     ".f95", FORM_FREE}
 157     ,
 158     {
 159     ".f03", FORM_FREE}
 160     ,
 161     {
 162     ".f08", FORM_FREE}
 163     ,
 164     {
 165     ".f", FORM_FIXED}
 166     ,
 167     {
 168     ".for", FORM_FIXED}
 169     ,
 170     {
 171     ".ftn", FORM_FIXED}
 172     ,
 173     {
 174     "", FORM_UNKNOWN}
 175   };            /* sentinel value */
 176
 177   gfc_source_form f_form;
 178   const char *fileext;
 179   int i;
 180
 181   /* Find end of file name.  Note, filename is either a NULL pointer or
 182      a NUL terminated string.  */
 183   i = 0;
 184   while (filename[i] != '\0')
 185     i++;
 186
 187   /* Find last period.  */
 188   while (i >= 0 && (filename[i] != '.'))
 189     i--;
 190
 191   /* Did we see a file extension?  */
 192   if (i < 0)
 193     return FORM_UNKNOWN; /* Nope  */
 194
 195   /* Get file extension and compare it to others.  */
 196   fileext = &(filename[i]);
 197
 198   i = -1;
 199   f_form = FORM_UNKNOWN;
 200   do
 201     {
 202       i++;
 203       if (strcasecmp (fileext, exttype[i].extension) == 0)
 204         {
 205           f_form = exttype[i].form;
 206           break;
 207         }
 208     }
 209   while (exttype[i].form != FORM_UNKNOWN);
 210
 211   return f_form;
 212 }
 213
 214
 215 /* Finalize commandline options.  */
 216
 217 bool
 218 gfc_post_options (const char **pfilename)
 219 {
 220   const char *filename = *pfilename, *canon_source_file = NULL;
 221   char *source_path;
 222   int i;
 223
 224   /* Excess precision other than "fast" requires front-end
 225      support.  */
 226   if (flag_excess_precision_cmdline == EXCESS_PRECISION_STANDARD)
 227     sorry ("-fexcess-precision=standard for Fortran");
 228   flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
 229
 230   /* Fortran allows associative math - but we cannot reassociate if
 231      we want traps or signed zeros. Cf. also flag_protect_parens.  */
 232   if (flag_associative_math == -1)
 233     flag_associative_math = (!flag_trapping_math && !flag_signed_zeros);
 234
 235   if (flag_protect_parens == -1)
 236     flag_protect_parens = !optimize_fast;
 237
 238   /* -Ofast sets implies -fstack-arrays unless an explicit size is set for
 239      stack arrays.  */
 240   if (flag_stack_arrays == -1 && flag_max_stack_var_size == -2)
 241     flag_stack_arrays = optimize_fast;
 242
 243   /* By default, disable (re)allocation during assignment for -std=f95,
 244      and enable it for F2003/F2008/GNU/Legacy.  */
 245   if (flag_realloc_lhs == -1)
 246     {
 247       if (gfc_option.allow_std & GFC_STD_F2003)
 248         flag_realloc_lhs = 1;
 249       else
 250         flag_realloc_lhs = 0;
 251     }
 252
 253   /* -fbounds-check is equivalent to -fcheck=bounds */
 254   if (flag_bounds_check)
 255     gfc_option.rtcheck |= GFC_RTCHECK_BOUNDS;
 256
 257   if (flag_compare_debug)
 258     flag_dump_fortran_original = 0;
 259
 260   /* Make -fmax-errors visible to gfortran's diagnostic machinery.  */
 261   if (global_options_set.x_flag_max_errors)
 262     gfc_option.max_errors = flag_max_errors;
 263
 264   /* Verify the input file name.  */
 265   if (!filename || strcmp (filename, "-") == 0)
 266     {
 267       filename = "";
 268     }
 269
 270   if (gfc_option.flag_preprocessed)
 271     {
 272       /* For preprocessed files, if the first tokens are of the form # NUM.
 273          handle the directives so we know the original file name.  */
 274       gfc_source_file = gfc_read_orig_filename (filename, &canon_source_file);
 275       if (gfc_source_file == NULL)
 276         gfc_source_file = filename;
 277       else
 278         *pfilename = gfc_source_file;
 279     }
 280   else
 281     gfc_source_file = filename;
 282
 283   if (canon_source_file == NULL)
 284     canon_source_file = gfc_source_file;
 285
 286   /* Adds the path where the source file is to the list of include files.  */
 287
 288   i = strlen (canon_source_file);
 289   while (i > 0 && !IS_DIR_SEPARATOR (canon_source_file[i]))
 290     i--;
 291
 292   if (i != 0)
 293     {
 294       source_path = (char *) alloca (i + 1);
 295       memcpy (source_path, canon_source_file, i);
 296       source_path[i] = 0;
 297       gfc_add_include_path (source_path, true, true, true);
 298     }
 299   else
 300     gfc_add_include_path (".", true, true, true);
 301
 302   if (canon_source_file != gfc_source_file)
 303     free (CONST_CAST (char *, canon_source_file));
 304
 305   /* Decide which form the file will be read in as.  */
 306
 307   if (gfc_option.source_form != FORM_UNKNOWN)
 308     gfc_current_form = gfc_option.source_form;
 309   else
 310     {
 311       gfc_current_form = form_from_filename (filename);
 312
 313       if (gfc_current_form == FORM_UNKNOWN)
 314         {
 315           gfc_current_form = FORM_FREE;
 316           gfc_warning_now (0, "Reading file %qs as free form",
 317                            (filename[0] == '\0') ? "<stdin>" : filename);
 318         }
 319     }
 320
 321   /* If the user specified -fd-lines-as-{code|comments} verify that we're
 322      in fixed form.  */
 323   if (gfc_current_form == FORM_FREE)
 324     {
 325       if (gfc_option.flag_d_lines == 0)
 326         gfc_warning_now (0, "%<-fd-lines-as-comments%> has no effect "
 327                            "in free form");
 328       else if (gfc_option.flag_d_lines == 1)
 329         gfc_warning_now (0, "%<-fd-lines-as-code%> has no effect in free form");
 330
 331       if (warn_line_truncation == -1)
 332           warn_line_truncation = 1;
 333
 334       /* Enable -Werror=line-truncation when -Werror and -Wno-error have
 335          not been set.  */
 336       if (warn_line_truncation && !global_options_set.x_warnings_are_errors
 337           && (global_dc->classify_diagnostic[OPT_Wline_truncation] ==
 338               DK_UNSPECIFIED))
 339         diagnostic_classify_diagnostic (global_dc, OPT_Wline_truncation,
 340                                         DK_ERROR, UNKNOWN_LOCATION);
 341     }
 342   else
 343     {
 344       /* With -fdec, set -fd-lines-as-comments by default in fixed form.  */
 345       if (flag_dec && gfc_option.flag_d_lines == -1)
 346         gfc_option.flag_d_lines = 0;
 347
 348       if (warn_line_truncation == -1)
 349         warn_line_truncation = 0;
 350     }
 351
 352   /* If -pedantic, warn about the use of GNU extensions.  */
 353   if (pedantic && (gfc_option.allow_std & GFC_STD_GNU) != 0)
 354     gfc_option.warn_std |= GFC_STD_GNU;
 355   /* -std=legacy -pedantic is effectively -std=gnu.  */
 356   if (pedantic && (gfc_option.allow_std & GFC_STD_LEGACY) != 0)
 357     gfc_option.warn_std |= GFC_STD_F95_OBS | GFC_STD_F95_DEL | GFC_STD_LEGACY;
 358
 359   /* If the user didn't explicitly specify -f(no)-second-underscore we
 360      use it if we're trying to be compatible with f2c, and not
 361      otherwise.  */
 362   if (flag_second_underscore == -1)
 363     flag_second_underscore = flag_f2c;
 364
 365   if (!flag_automatic && flag_max_stack_var_size != -2
 366       && flag_max_stack_var_size != 0)
 367     gfc_warning_now (0, "Flag %<-fno-automatic%> overwrites %<-fmax-stack-var-size=%d%>",
 368                      flag_max_stack_var_size);
 369   else if (!flag_automatic && flag_recursive)
 370     gfc_warning_now (0, "Flag %<-fno-automatic%> overwrites %<-frecursive%>");
 371   else if (!flag_automatic && flag_openmp)
 372     gfc_warning_now (0, "Flag %<-fno-automatic%> overwrites %<-frecursive%> implied by "
 373                      "%<-fopenmp%>");
 374   else if (flag_max_stack_var_size != -2 && flag_recursive)
 375     gfc_warning_now (0, "Flag %<-frecursive%> overwrites %<-fmax-stack-var-size=%d%>",
 376                      flag_max_stack_var_size);
 377   else if (flag_max_stack_var_size != -2 && flag_openmp)
 378     gfc_warning_now (0, "Flag %<-fmax-stack-var-size=%d%> overwrites %<-frecursive%> "
 379                      "implied by %<-fopenmp%>", flag_max_stack_var_size);
 380
 381   /* Implement -frecursive as -fmax-stack-var-size=-1.  */
 382   if (flag_recursive)
 383     flag_max_stack_var_size = -1;
 384
 385   /* Implied -frecursive; implemented as -fmax-stack-var-size=-1.  */
 386   if (flag_max_stack_var_size == -2 && flag_openmp && flag_automatic)
 387     {
 388       flag_recursive = 1;
 389       flag_max_stack_var_size = -1;
 390     }
 391
 392   /* Set flag_stack_arrays correctly.  */
 393   if (flag_stack_arrays == -1)
 394     flag_stack_arrays = 0;
 395
 396   /* Set default.  */
 397   if (flag_max_stack_var_size == -2)
 398     flag_max_stack_var_size = 32768;
 399
 400   /* Implement -fno-automatic as -fmax-stack-var-size=0.  */
 401   if (!flag_automatic)
 402     flag_max_stack_var_size = 0;
 403
 404   /* If the user did not specify an inline matmul limit, inline up to the BLAS
 405      limit or up to 30 if no external BLAS is specified.  */
 406
 407   if (flag_inline_matmul_limit < 0)
 408     {
 409       if (flag_external_blas)
 410         flag_inline_matmul_limit = flag_blas_matmul_limit;
 411       else
 412         flag_inline_matmul_limit = 30;
 413     }
 414
 415   /* Optimization implies front end optimization, unless the user
 416      specified it directly.  */
 417
 418   if (flag_frontend_optimize == -1)
 419     flag_frontend_optimize = optimize;
 420
 421   /* Same for front end loop interchange.  */
 422
 423   if (flag_frontend_loop_interchange == -1)
 424     flag_frontend_loop_interchange = optimize;
 425
 426   if (flag_max_array_constructor < 65535)
 427     flag_max_array_constructor = 65535;
 428
 429   if (flag_fixed_line_length != 0 && flag_fixed_line_length < 7)
 430     gfc_fatal_error ("Fixed line length must be at least seven");
 431
 432   if (flag_free_line_length != 0 && flag_free_line_length < 4)
 433     gfc_fatal_error ("Free line length must be at least three");
 434
 435   if (flag_max_subrecord_length > MAX_SUBRECORD_LENGTH)
 436     gfc_fatal_error ("Maximum subrecord length cannot exceed %d",
 437                      MAX_SUBRECORD_LENGTH);
 438
 439   gfc_cpp_post_options ();
 440
 441   if (gfc_option.allow_std & GFC_STD_F2008)
 442     lang_hooks.name = "GNU Fortran2008";
 443   else if (gfc_option.allow_std & GFC_STD_F2003)
 444     lang_hooks.name = "GNU Fortran2003";
 445
 446   return gfc_cpp_preprocess_only ();
 447 }
 448
 449
 450 static void
 451 gfc_handle_module_path_options (const char *arg)
 452 {
 453
 454   if (gfc_option.module_dir != NULL)
 455     gfc_fatal_error ("gfortran: Only one %<-J%> option allowed");
 456
 457   gfc_option.module_dir = XCNEWVEC (char, strlen (arg) + 2);
 458   strcpy (gfc_option.module_dir, arg);
 459
 460   gfc_add_include_path (gfc_option.module_dir, true, false, true);
 461
 462   strcat (gfc_option.module_dir, "/");
 463 }
 464
 465
 466 /* Handle options -ffpe-trap= and -ffpe-summary=.  */
 467
 468 static void
 469 gfc_handle_fpe_option (const char *arg, bool trap)
 470 {
 471   int result, pos = 0, n;
 472   /* precision is a backwards compatibility alias for inexact.  */
 473   static const char * const exception[] = { "invalid", "denormal", "zero",
 474                                             "overflow", "underflow",
 475                                             "inexact", "precision", NULL };
 476   static const int opt_exception[] = { GFC_FPE_INVALID, GFC_FPE_DENORMAL,
 477                                        GFC_FPE_ZERO, GFC_FPE_OVERFLOW,
 478                                        GFC_FPE_UNDERFLOW, GFC_FPE_INEXACT,
 479                                        GFC_FPE_INEXACT,
 480                                        0 };
 481
 482   /* As the default for -ffpe-summary= is nonzero, set it to 0.  */
 483   if (!trap)
 484     gfc_option.fpe_summary = 0;
 485
 486   while (*arg)
 487     {
 488       while (*arg == ',')
 489         arg++;
 490
 491       while (arg[pos] && arg[pos] != ',')
 492         pos++;
 493
 494       result = 0;
 495       if (!trap && strncmp ("none", arg, pos) == 0)
 496         {
 497           gfc_option.fpe_summary = 0;
 498           arg += pos;
 499           pos = 0;
 500           continue;
 501         }
 502       else if (!trap && strncmp ("all", arg, pos) == 0)
 503         {
 504           gfc_option.fpe_summary = GFC_FPE_INVALID | GFC_FPE_DENORMAL
 505                                    | GFC_FPE_ZERO | GFC_FPE_OVERFLOW
 506                                    | GFC_FPE_UNDERFLOW | GFC_FPE_INEXACT;
 507           arg += pos;
 508           pos = 0;
 509           continue;
 510         }
 511       else
 512         for (n = 0; exception[n] != NULL; n++)
 513           {
 514           if (exception[n] && strncmp (exception[n], arg, pos) == 0)
 515             {
 516               if (trap)
 517                 gfc_option.fpe |= opt_exception[n];
 518               else
 519                 gfc_option.fpe_summary |= opt_exception[n];
 520               arg += pos;
 521               pos = 0;
 522               result = 1;
 523               break;
 524             }
 525           }
 526       if (!result && !trap)
 527         gfc_fatal_error ("Argument to %<-ffpe-trap%> is not valid: %s", arg);
 528       else if (!result)
 529         gfc_fatal_error ("Argument to %<-ffpe-summary%> is not valid: %s", arg);
 530
 531     }
 532 }
 533
 534
 535 static void
 536 gfc_handle_runtime_check_option (const char *arg)
 537 {
 538   int result, pos = 0, n;
 539   static const char * const optname[] = { "all", "bounds", "array-temps",
 540                                           "recursion", "do", "pointer",
 541                                           "mem", NULL };
 542   static const int optmask[] = { GFC_RTCHECK_ALL, GFC_RTCHECK_BOUNDS,
 543                                  GFC_RTCHECK_ARRAY_TEMPS,
 544                                  GFC_RTCHECK_RECURSION, GFC_RTCHECK_DO,
 545                                  GFC_RTCHECK_POINTER, GFC_RTCHECK_MEM,
 546                                  0 };
 547
 548   while (*arg)
 549     {
 550       while (*arg == ',')
 551         arg++;
 552
 553       while (arg[pos] && arg[pos] != ',')
 554         pos++;
 555
 556       result = 0;
 557       for (n = 0; optname[n] != NULL; n++)
 558         {
 559           if (optname[n] && strncmp (optname[n], arg, pos) == 0)
 560             {
 561               gfc_option.rtcheck |= optmask[n];
 562               arg += pos;
 563               pos = 0;
 564               result = 1;
 565               break;
 566             }
 567           else if (optname[n] && pos > 3 && strncmp ("no-", arg, 3) == 0
 568                    && strncmp (optname[n], arg+3, pos-3) == 0)
 569             {
 570               gfc_option.rtcheck &= ~optmask[n];
 571               arg += pos;
 572               pos = 0;
 573               result = 1;
 574               break;
 575             }
 576         }
 577       if (!result)
 578         gfc_fatal_error ("Argument to %<-fcheck%> is not valid: %s", arg);
 579     }
 580 }
 581
 582
 583 /* Handle command-line options.  Returns 0 if unrecognized, 1 if
 584    recognized and handled.  */
 585
 586 bool
 587 gfc_handle_option (size_t scode, const char *arg, int value,
 588                    int kind ATTRIBUTE_UNUSED, location_t loc ATTRIBUTE_UNUSED,
 589                    const struct cl_option_handlers *handlers ATTRIBUTE_UNUSED)
 590 {
 591   bool result = true;
 592   enum opt_code code = (enum opt_code) scode;
 593
 594   if (gfc_cpp_handle_option (scode, arg, value) == 1)
 595     return true;
 596
 597   switch (code)
 598     {
 599     default:
 600       if (cl_options[code].flags & gfc_option_lang_mask ())
 601         break;
 602       result = false;
 603       break;
 604
 605     case OPT_fcheck_array_temporaries:
 606       gfc_option.rtcheck |= GFC_RTCHECK_ARRAY_TEMPS;
 607       break;
 608
 609     case OPT_fd_lines_as_code:
 610       gfc_option.flag_d_lines = 1;
 611       break;
 612
 613     case OPT_fd_lines_as_comments:
 614       gfc_option.flag_d_lines = 0;
 615       break;
 616
 617     case OPT_ffixed_form:
 618       gfc_option.source_form = FORM_FIXED;
 619       break;
 620
 621     case OPT_ffree_form:
 622       gfc_option.source_form = FORM_FREE;
 623       break;
 624
 625     case OPT_static_libgfortran:
 626 #ifndef HAVE_LD_STATIC_DYNAMIC
 627       gfc_fatal_error ("%<-static-libgfortran%> is not supported in this "
 628                        "configuration");
 629 #endif
 630       break;
 631
 632     case OPT_fintrinsic_modules_path:
 633     case OPT_fintrinsic_modules_path_:
 634
 635       /* This is needed because omp_lib.h is in a directory together
 636          with intrinsic modules.  Do no warn because during testing
 637          without an installed compiler, we would get lots of bogus
 638          warnings for a missing include directory.  */
 639       gfc_add_include_path (arg, false, false, false);
 640
 641       gfc_add_intrinsic_modules_path (arg);
 642       break;
 643
 644     case OPT_fpreprocessed:
 645       gfc_option.flag_preprocessed = value;
 646       break;
 647
 648     case OPT_fmax_identifier_length_:
 649       if (value > GFC_MAX_SYMBOL_LEN)
 650         gfc_fatal_error ("Maximum supported identifier length is %d",
 651                          GFC_MAX_SYMBOL_LEN);
 652       gfc_option.max_identifier_length = value;
 653       break;
 654
 655     case OPT_finit_local_zero:
 656       gfc_option.flag_init_integer = GFC_INIT_INTEGER_ON;
 657       gfc_option.flag_init_integer_value = 0;
 658       flag_init_real = GFC_INIT_REAL_ZERO;
 659       gfc_option.flag_init_logical = GFC_INIT_LOGICAL_FALSE;
 660       gfc_option.flag_init_character = GFC_INIT_CHARACTER_ON;
 661       gfc_option.flag_init_character_value = (char)0;
 662       break;
 663
 664     case OPT_finit_logical_:
 665       if (!strcasecmp (arg, "false"))
 666         gfc_option.flag_init_logical = GFC_INIT_LOGICAL_FALSE;
 667       else if (!strcasecmp (arg, "true"))
 668         gfc_option.flag_init_logical = GFC_INIT_LOGICAL_TRUE;
 669       else
 670         gfc_fatal_error ("Unrecognized option to %<-finit-logical%>: %s",
 671                          arg);
 672       break;
 673
 674     case OPT_finit_integer_:
 675       gfc_option.flag_init_integer = GFC_INIT_INTEGER_ON;
 676       gfc_option.flag_init_integer_value = atoi (arg);
 677       break;
 678
 679     case OPT_finit_character_:
 680       if (value >= 0 && value <= 127)
 681         {
 682           gfc_option.flag_init_character = GFC_INIT_CHARACTER_ON;
 683           gfc_option.flag_init_character_value = (char)value;
 684         }
 685       else
 686         gfc_fatal_error ("The value of n in %<-finit-character=n%> must be "
 687                          "between 0 and 127");
 688       break;
 689
 690     case OPT_I:
 691       gfc_add_include_path (arg, true, false, true);
 692       break;
 693
 694     case OPT_J:
 695       gfc_handle_module_path_options (arg);
 696       break;
 697
 698     case OPT_ffpe_trap_:
 699       gfc_handle_fpe_option (arg, true);
 700       break;
 701
 702     case OPT_ffpe_summary_:
 703       gfc_handle_fpe_option (arg, false);
 704       break;
 705
 706     case OPT_std_f95:
 707       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F95 | GFC_STD_F77
 708                              | GFC_STD_F2008_OBS;
 709       gfc_option.warn_std = GFC_STD_F95_OBS;
 710       gfc_option.max_continue_fixed = 19;
 711       gfc_option.max_continue_free = 39;
 712       gfc_option.max_identifier_length = 31;
 713       warn_ampersand = 1;
 714       warn_tabs = 1;
 715       break;
 716
 717     case OPT_std_f2003:
 718       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F77
 719         | GFC_STD_F2003 | GFC_STD_F95 | GFC_STD_F2008_OBS;
 720       gfc_option.warn_std = GFC_STD_F95_OBS;
 721       gfc_option.max_identifier_length = 63;
 722       warn_ampersand = 1;
 723       warn_tabs = 1;
 724       break;
 725
 726     case OPT_std_f2008:
 727       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F77
 728         | GFC_STD_F2003 | GFC_STD_F95 | GFC_STD_F2008 | GFC_STD_F2008_OBS;
 729       gfc_option.warn_std = GFC_STD_F95_OBS | GFC_STD_F2008_OBS;
 730       gfc_option.max_identifier_length = 63;
 731       warn_ampersand = 1;
 732       warn_tabs = 1;
 733       break;
 734
 735     case OPT_std_f2008ts:
 736       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F77
 737         | GFC_STD_F2003 | GFC_STD_F95 | GFC_STD_F2008 | GFC_STD_F2008_OBS
 738         | GFC_STD_F2008_TS;
 739       gfc_option.warn_std = GFC_STD_F95_OBS | GFC_STD_F2008_OBS;
 740       gfc_option.max_identifier_length = 63;
 741       warn_ampersand = 1;
 742       warn_tabs = 1;
 743       break;
 744
 745     case OPT_std_f2018:
 746       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F77
 747         | GFC_STD_F2003 | GFC_STD_F95 | GFC_STD_F2008 | GFC_STD_F2008_OBS
 748         | GFC_STD_F2008_TS | GFC_STD_F2018 | GFC_STD_F2018_OBS;
 749       gfc_option.warn_std = GFC_STD_F95_OBS | GFC_STD_F2008_OBS
 750         | GFC_STD_F2018_OBS;
 751       gfc_option.max_identifier_length = 63;
 752       warn_ampersand = 1;
 753       warn_tabs = 1;
 754       break;
 755
 756     case OPT_std_gnu:
 757       set_default_std_flags ();
 758       break;
 759
 760     case OPT_std_legacy:
 761       set_default_std_flags ();
 762       gfc_option.warn_std = 0;
 763       break;
 764
 765     case OPT_fshort_enums:
 766       /* Handled in language-independent code.  */
 767       break;
 768
 769     case OPT_fcheck_:
 770       gfc_handle_runtime_check_option (arg);
 771       break;
 772
 773     case OPT_fdec:
 774       /* Enable all DEC extensions.  */
 775       set_dec_flags (1);
 776       break;
 777
 778     case OPT_fdec_structure:
 779       flag_dec_structure = 1;
 780       break;
 781     }
 782
 783   Fortran_handle_option_auto (&global_options, &global_options_set,
 784                               scode, arg, value,
 785                               gfc_option_lang_mask (), kind,
 786                               loc, handlers, global_dc);
 787   return result;
 788 }
 789
 790
 791 /* Return a string with the options passed to the compiler; used for
 792    Fortran's compiler_options() intrinsic.  */
 793
 794 char *
 795 gfc_get_option_string (void)
 796 {
 797   unsigned j;
 798   size_t len, pos;
 799   char *result;
 800
 801   /* Allocate and return a one-character string with '\0'.  */
 802   if (!save_decoded_options_count)
 803     return XCNEWVEC (char, 1);
 804
 805   /* Determine required string length.  */
 806
 807   len = 0;
 808   for (j = 1; j < save_decoded_options_count; j++)
 809     {
 810       switch (save_decoded_options[j].opt_index)
 811         {
 812         case OPT_o:
 813         case OPT_d:
 814         case OPT_dumpbase:
 815         case OPT_dumpdir:
 816         case OPT_auxbase:
 817         case OPT_quiet:
 818         case OPT_version:
 819         case OPT_fintrinsic_modules_path:
 820         case OPT_fintrinsic_modules_path_:
 821           /* Ignore these.  */
 822           break;
 823         default:
 824           /* Ignore file names.  */
 825           if (save_decoded_options[j].orig_option_with_args_text[0] == '-')
 826             len += 1
 827                  + strlen (save_decoded_options[j].orig_option_with_args_text);
 828         }
 829     }
 830
 831   result = XCNEWVEC (char, len);
 832
 833   pos = 0;
 834   for (j = 1; j < save_decoded_options_count; j++)
 835     {
 836       switch (save_decoded_options[j].opt_index)
 837         {
 838         case OPT_o:
 839         case OPT_d:
 840         case OPT_dumpbase:
 841         case OPT_dumpdir:
 842         case OPT_auxbase:
 843         case OPT_quiet:
 844         case OPT_version:
 845         case OPT_fintrinsic_modules_path:
 846         case OPT_fintrinsic_modules_path_:
 847           /* Ignore these.  */
 848           continue;
 849
 850         case OPT_cpp_:
 851           /* Use "-cpp" rather than "-cpp=<temporary file>".  */
 852           len = 4;
 853           break;
 854
 855         default:
 856           /* Ignore file names.  */
 857           if (save_decoded_options[j].orig_option_with_args_text[0] != '-')
 858             continue;
 859
 860           len = strlen (save_decoded_options[j].orig_option_with_args_text);
 861         }
 862
 863       memcpy (&result[pos], save_decoded_options[j].orig_option_with_args_text, len);
 864       pos += len;
 865       result[pos++] = ' ';
 866     }
 867
 868   result[--pos] = '\0';
 869   return result;
 870 }