gcc/fortran/options.c

   1 /* Parse and display command line options.
   2    Copyright (C) 2000-2017 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_option.warn_std = GFC_STD_F95_DEL | GFC_STD_LEGACY;
  47 }
  48
  49
  50 /* Set all the DEC extension flags.  */
  51
  52 static void
  53 set_dec_flags (int value)
  54 {
  55   /* Allow legacy code without warnings.  */
  56   gfc_option.allow_std |= GFC_STD_F95_OBS | GFC_STD_F95_DEL
  57     | GFC_STD_GNU | GFC_STD_LEGACY;
  58   gfc_option.warn_std &= ~(GFC_STD_LEGACY | GFC_STD_F95_DEL);
  59
  60   /* Set -fd-lines-as-comments by default.  */
  61   if (value && gfc_current_form != FORM_FREE && gfc_option.flag_d_lines == -1)
  62     gfc_option.flag_d_lines = 0;
  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   if (flag_stack_arrays == -1)
 239     flag_stack_arrays = optimize_fast;
 240
 241   /* By default, disable (re)allocation during assignment for -std=f95,
 242      and enable it for F2003/F2008/GNU/Legacy.  */
 243   if (flag_realloc_lhs == -1)
 244     {
 245       if (gfc_option.allow_std & GFC_STD_F2003)
 246         flag_realloc_lhs = 1;
 247       else
 248         flag_realloc_lhs = 0;
 249     }
 250
 251   /* -fbounds-check is equivalent to -fcheck=bounds */
 252   if (flag_bounds_check)
 253     gfc_option.rtcheck |= GFC_RTCHECK_BOUNDS;
 254
 255   if (flag_compare_debug)
 256     flag_dump_fortran_original = 0;
 257
 258   /* Make -fmax-errors visible to gfortran's diagnostic machinery.  */
 259   if (global_options_set.x_flag_max_errors)
 260     gfc_option.max_errors = flag_max_errors;
 261
 262   /* Verify the input file name.  */
 263   if (!filename || strcmp (filename, "-") == 0)
 264     {
 265       filename = "";
 266     }
 267
 268   if (gfc_option.flag_preprocessed)
 269     {
 270       /* For preprocessed files, if the first tokens are of the form # NUM.
 271          handle the directives so we know the original file name.  */
 272       gfc_source_file = gfc_read_orig_filename (filename, &canon_source_file);
 273       if (gfc_source_file == NULL)
 274         gfc_source_file = filename;
 275       else
 276         *pfilename = gfc_source_file;
 277     }
 278   else
 279     gfc_source_file = filename;
 280
 281   if (canon_source_file == NULL)
 282     canon_source_file = gfc_source_file;
 283
 284   /* Adds the path where the source file is to the list of include files.  */
 285
 286   i = strlen (canon_source_file);
 287   while (i > 0 && !IS_DIR_SEPARATOR (canon_source_file[i]))
 288     i--;
 289
 290   if (i != 0)
 291     {
 292       source_path = (char *) alloca (i + 1);
 293       memcpy (source_path, canon_source_file, i);
 294       source_path[i] = 0;
 295       gfc_add_include_path (source_path, true, true, true);
 296     }
 297   else
 298     gfc_add_include_path (".", true, true, true);
 299
 300   if (canon_source_file != gfc_source_file)
 301     free (CONST_CAST (char *, canon_source_file));
 302
 303   /* Decide which form the file will be read in as.  */
 304
 305   if (gfc_option.source_form != FORM_UNKNOWN)
 306     gfc_current_form = gfc_option.source_form;
 307   else
 308     {
 309       gfc_current_form = form_from_filename (filename);
 310
 311       if (gfc_current_form == FORM_UNKNOWN)
 312         {
 313           gfc_current_form = FORM_FREE;
 314           gfc_warning_now (0, "Reading file %qs as free form",
 315                            (filename[0] == '\0') ? "<stdin>" : filename);
 316         }
 317     }
 318
 319   /* If the user specified -fd-lines-as-{code|comments} verify that we're
 320      in fixed form.  */
 321   if (gfc_current_form == FORM_FREE)
 322     {
 323       if (gfc_option.flag_d_lines == 0)
 324         gfc_warning_now (0, "%<-fd-lines-as-comments%> has no effect "
 325                            "in free form");
 326       else if (gfc_option.flag_d_lines == 1)
 327         gfc_warning_now (0, "%<-fd-lines-as-code%> has no effect in free form");
 328
 329       if (warn_line_truncation == -1)
 330           warn_line_truncation = 1;
 331
 332       /* Enable -Werror=line-truncation when -Werror and -Wno-error have
 333          not been set.  */
 334       if (warn_line_truncation && !global_options_set.x_warnings_are_errors
 335           && (global_dc->classify_diagnostic[OPT_Wline_truncation] ==
 336               DK_UNSPECIFIED))
 337         diagnostic_classify_diagnostic (global_dc, OPT_Wline_truncation,
 338                                         DK_ERROR, UNKNOWN_LOCATION);
 339     }
 340   else if (warn_line_truncation == -1)
 341     warn_line_truncation = 0;
 342
 343   /* If -pedantic, warn about the use of GNU extensions.  */
 344   if (pedantic && (gfc_option.allow_std & GFC_STD_GNU) != 0)
 345     gfc_option.warn_std |= GFC_STD_GNU;
 346   /* -std=legacy -pedantic is effectively -std=gnu.  */
 347   if (pedantic && (gfc_option.allow_std & GFC_STD_LEGACY) != 0)
 348     gfc_option.warn_std |= GFC_STD_F95_OBS | GFC_STD_F95_DEL | GFC_STD_LEGACY;
 349
 350   /* If the user didn't explicitly specify -f(no)-second-underscore we
 351      use it if we're trying to be compatible with f2c, and not
 352      otherwise.  */
 353   if (flag_second_underscore == -1)
 354     flag_second_underscore = flag_f2c;
 355
 356   if (!flag_automatic && flag_max_stack_var_size != -2
 357       && flag_max_stack_var_size != 0)
 358     gfc_warning_now (0, "Flag %<-fno-automatic%> overwrites %<-fmax-stack-var-size=%d%>",
 359                      flag_max_stack_var_size);
 360   else if (!flag_automatic && flag_recursive)
 361     gfc_warning_now (0, "Flag %<-fno-automatic%> overwrites %<-frecursive%>");
 362   else if (!flag_automatic && flag_openmp)
 363     gfc_warning_now (0, "Flag %<-fno-automatic%> overwrites %<-frecursive%> implied by "
 364                      "%<-fopenmp%>");
 365   else if (flag_max_stack_var_size != -2 && flag_recursive)
 366     gfc_warning_now (0, "Flag %<-frecursive%> overwrites %<-fmax-stack-var-size=%d%>",
 367                      flag_max_stack_var_size);
 368   else if (flag_max_stack_var_size != -2 && flag_openmp)
 369     gfc_warning_now (0, "Flag %<-fmax-stack-var-size=%d%> overwrites %<-frecursive%> "
 370                      "implied by %<-fopenmp%>", flag_max_stack_var_size);
 371
 372   /* Implement -frecursive as -fmax-stack-var-size=-1.  */
 373   if (flag_recursive)
 374     flag_max_stack_var_size = -1;
 375
 376   /* Implied -frecursive; implemented as -fmax-stack-var-size=-1.  */
 377   if (flag_max_stack_var_size == -2 && flag_openmp && flag_automatic)
 378     {
 379       flag_recursive = 1;
 380       flag_max_stack_var_size = -1;
 381     }
 382
 383   /* Set default.  */
 384   if (flag_max_stack_var_size == -2)
 385     flag_max_stack_var_size = 32768;
 386
 387   /* Implement -fno-automatic as -fmax-stack-var-size=0.  */
 388   if (!flag_automatic)
 389     flag_max_stack_var_size = 0;
 390
 391   /* If the user did not specify an inline matmul limit, inline up to the BLAS
 392      limit or up to 30 if no external BLAS is specified.  */
 393
 394   if (flag_inline_matmul_limit < 0)
 395     {
 396       if (flag_external_blas)
 397         flag_inline_matmul_limit = flag_blas_matmul_limit;
 398       else
 399         flag_inline_matmul_limit = 30;
 400     }
 401
 402   /* Optimization implies front end optimization, unless the user
 403      specified it directly.  */
 404
 405   if (flag_frontend_optimize == -1)
 406     flag_frontend_optimize = optimize;
 407
 408   if (flag_max_array_constructor < 65535)
 409     flag_max_array_constructor = 65535;
 410
 411   if (flag_fixed_line_length != 0 && flag_fixed_line_length < 7)
 412     gfc_fatal_error ("Fixed line length must be at least seven");
 413
 414   if (flag_free_line_length != 0 && flag_free_line_length < 4)
 415     gfc_fatal_error ("Free line length must be at least three");
 416
 417   if (flag_max_subrecord_length > MAX_SUBRECORD_LENGTH)
 418     gfc_fatal_error ("Maximum subrecord length cannot exceed %d",
 419                      MAX_SUBRECORD_LENGTH);
 420
 421   gfc_cpp_post_options ();
 422
 423   if (gfc_option.allow_std & GFC_STD_F2008)
 424     lang_hooks.name = "GNU Fortran2008";
 425   else if (gfc_option.allow_std & GFC_STD_F2003)
 426     lang_hooks.name = "GNU Fortran2003";
 427
 428   return gfc_cpp_preprocess_only ();
 429 }
 430
 431
 432 static void
 433 gfc_handle_module_path_options (const char *arg)
 434 {
 435
 436   if (gfc_option.module_dir != NULL)
 437     gfc_fatal_error ("gfortran: Only one %<-J%> option allowed");
 438
 439   gfc_option.module_dir = XCNEWVEC (char, strlen (arg) + 2);
 440   strcpy (gfc_option.module_dir, arg);
 441
 442   gfc_add_include_path (gfc_option.module_dir, true, false, true);
 443
 444   strcat (gfc_option.module_dir, "/");
 445 }
 446
 447
 448 /* Handle options -ffpe-trap= and -ffpe-summary=.  */
 449
 450 static void
 451 gfc_handle_fpe_option (const char *arg, bool trap)
 452 {
 453   int result, pos = 0, n;
 454   /* precision is a backwards compatibility alias for inexact.  */
 455   static const char * const exception[] = { "invalid", "denormal", "zero",
 456                                             "overflow", "underflow",
 457                                             "inexact", "precision", NULL };
 458   static const int opt_exception[] = { GFC_FPE_INVALID, GFC_FPE_DENORMAL,
 459                                        GFC_FPE_ZERO, GFC_FPE_OVERFLOW,
 460                                        GFC_FPE_UNDERFLOW, GFC_FPE_INEXACT,
 461                                        GFC_FPE_INEXACT,
 462                                        0 };
 463
 464   /* As the default for -ffpe-summary= is nonzero, set it to 0.  */
 465   if (!trap)
 466     gfc_option.fpe_summary = 0;
 467
 468   while (*arg)
 469     {
 470       while (*arg == ',')
 471         arg++;
 472
 473       while (arg[pos] && arg[pos] != ',')
 474         pos++;
 475
 476       result = 0;
 477       if (!trap && strncmp ("none", arg, pos) == 0)
 478         {
 479           gfc_option.fpe_summary = 0;
 480           arg += pos;
 481           pos = 0;
 482           continue;
 483         }
 484       else if (!trap && strncmp ("all", arg, pos) == 0)
 485         {
 486           gfc_option.fpe_summary = GFC_FPE_INVALID | GFC_FPE_DENORMAL
 487                                    | GFC_FPE_ZERO | GFC_FPE_OVERFLOW
 488                                    | GFC_FPE_UNDERFLOW | GFC_FPE_INEXACT;
 489           arg += pos;
 490           pos = 0;
 491           continue;
 492         }
 493       else
 494         for (n = 0; exception[n] != NULL; n++)
 495           {
 496           if (exception[n] && strncmp (exception[n], arg, pos) == 0)
 497             {
 498               if (trap)
 499                 gfc_option.fpe |= opt_exception[n];
 500               else
 501                 gfc_option.fpe_summary |= opt_exception[n];
 502               arg += pos;
 503               pos = 0;
 504               result = 1;
 505               break;
 506             }
 507           }
 508       if (!result && !trap)
 509         gfc_fatal_error ("Argument to %<-ffpe-trap%> is not valid: %s", arg);
 510       else if (!result)
 511         gfc_fatal_error ("Argument to %<-ffpe-summary%> is not valid: %s", arg);
 512
 513     }
 514 }
 515
 516
 517 static void
 518 gfc_handle_runtime_check_option (const char *arg)
 519 {
 520   int result, pos = 0, n;
 521   static const char * const optname[] = { "all", "bounds", "array-temps",
 522                                           "recursion", "do", "pointer",
 523                                           "mem", NULL };
 524   static const int optmask[] = { GFC_RTCHECK_ALL, GFC_RTCHECK_BOUNDS,
 525                                  GFC_RTCHECK_ARRAY_TEMPS,
 526                                  GFC_RTCHECK_RECURSION, GFC_RTCHECK_DO,
 527                                  GFC_RTCHECK_POINTER, GFC_RTCHECK_MEM,
 528                                  0 };
 529
 530   while (*arg)
 531     {
 532       while (*arg == ',')
 533         arg++;
 534
 535       while (arg[pos] && arg[pos] != ',')
 536         pos++;
 537
 538       result = 0;
 539       for (n = 0; optname[n] != NULL; n++)
 540         {
 541           if (optname[n] && strncmp (optname[n], arg, pos) == 0)
 542             {
 543               gfc_option.rtcheck |= optmask[n];
 544               arg += pos;
 545               pos = 0;
 546               result = 1;
 547               break;
 548             }
 549           else if (optname[n] && pos > 3 && strncmp ("no-", arg, 3) == 0
 550                    && strncmp (optname[n], arg+3, pos-3) == 0)
 551             {
 552               gfc_option.rtcheck &= ~optmask[n];
 553               arg += pos;
 554               pos = 0;
 555               result = 1;
 556               break;
 557             }
 558         }
 559       if (!result)
 560         gfc_fatal_error ("Argument to %<-fcheck%> is not valid: %s", arg);
 561     }
 562 }
 563
 564
 565 /* Handle command-line options.  Returns 0 if unrecognized, 1 if
 566    recognized and handled.  */
 567
 568 bool
 569 gfc_handle_option (size_t scode, const char *arg, int value,
 570                    int kind ATTRIBUTE_UNUSED, location_t loc ATTRIBUTE_UNUSED,
 571                    const struct cl_option_handlers *handlers ATTRIBUTE_UNUSED)
 572 {
 573   bool result = true;
 574   enum opt_code code = (enum opt_code) scode;
 575
 576   if (gfc_cpp_handle_option (scode, arg, value) == 1)
 577     return true;
 578
 579   switch (code)
 580     {
 581     default:
 582       if (cl_options[code].flags & gfc_option_lang_mask ())
 583         break;
 584       result = false;
 585       break;
 586
 587     case OPT_fcheck_array_temporaries:
 588       gfc_option.rtcheck |= GFC_RTCHECK_ARRAY_TEMPS;
 589       break;
 590
 591     case OPT_fd_lines_as_code:
 592       gfc_option.flag_d_lines = 1;
 593       break;
 594
 595     case OPT_fd_lines_as_comments:
 596       gfc_option.flag_d_lines = 0;
 597       break;
 598
 599     case OPT_ffixed_form:
 600       gfc_option.source_form = FORM_FIXED;
 601       break;
 602
 603     case OPT_ffree_form:
 604       gfc_option.source_form = FORM_FREE;
 605       break;
 606
 607     case OPT_static_libgfortran:
 608 #ifndef HAVE_LD_STATIC_DYNAMIC
 609       gfc_fatal_error ("%<-static-libgfortran%> is not supported in this "
 610                        "configuration");
 611 #endif
 612       break;
 613
 614     case OPT_fintrinsic_modules_path:
 615     case OPT_fintrinsic_modules_path_:
 616
 617       /* This is needed because omp_lib.h is in a directory together
 618          with intrinsic modules.  Do no warn because during testing
 619          without an installed compiler, we would get lots of bogus
 620          warnings for a missing include directory.  */
 621       gfc_add_include_path (arg, false, false, false);
 622
 623       gfc_add_intrinsic_modules_path (arg);
 624       break;
 625
 626     case OPT_fpreprocessed:
 627       gfc_option.flag_preprocessed = value;
 628       break;
 629
 630     case OPT_fmax_identifier_length_:
 631       if (value > GFC_MAX_SYMBOL_LEN)
 632         gfc_fatal_error ("Maximum supported identifier length is %d",
 633                          GFC_MAX_SYMBOL_LEN);
 634       gfc_option.max_identifier_length = value;
 635       break;
 636
 637     case OPT_finit_local_zero:
 638       gfc_option.flag_init_integer = GFC_INIT_INTEGER_ON;
 639       gfc_option.flag_init_integer_value = 0;
 640       flag_init_real = GFC_INIT_REAL_ZERO;
 641       gfc_option.flag_init_logical = GFC_INIT_LOGICAL_FALSE;
 642       gfc_option.flag_init_character = GFC_INIT_CHARACTER_ON;
 643       gfc_option.flag_init_character_value = (char)0;
 644       break;
 645
 646     case OPT_finit_logical_:
 647       if (!strcasecmp (arg, "false"))
 648         gfc_option.flag_init_logical = GFC_INIT_LOGICAL_FALSE;
 649       else if (!strcasecmp (arg, "true"))
 650         gfc_option.flag_init_logical = GFC_INIT_LOGICAL_TRUE;
 651       else
 652         gfc_fatal_error ("Unrecognized option to %<-finit-logical%>: %s",
 653                          arg);
 654       break;
 655
 656     case OPT_finit_integer_:
 657       gfc_option.flag_init_integer = GFC_INIT_INTEGER_ON;
 658       gfc_option.flag_init_integer_value = atoi (arg);
 659       break;
 660
 661     case OPT_finit_character_:
 662       if (value >= 0 && value <= 127)
 663         {
 664           gfc_option.flag_init_character = GFC_INIT_CHARACTER_ON;
 665           gfc_option.flag_init_character_value = (char)value;
 666         }
 667       else
 668         gfc_fatal_error ("The value of n in %<-finit-character=n%> must be "
 669                          "between 0 and 127");
 670       break;
 671
 672     case OPT_I:
 673       gfc_add_include_path (arg, true, false, true);
 674       break;
 675
 676     case OPT_J:
 677       gfc_handle_module_path_options (arg);
 678       break;
 679
 680     case OPT_ffpe_trap_:
 681       gfc_handle_fpe_option (arg, true);
 682       break;
 683
 684     case OPT_ffpe_summary_:
 685       gfc_handle_fpe_option (arg, false);
 686       break;
 687
 688     case OPT_std_f95:
 689       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F95 | GFC_STD_F77
 690                              | GFC_STD_F2008_OBS;
 691       gfc_option.warn_std = GFC_STD_F95_OBS;
 692       gfc_option.max_continue_fixed = 19;
 693       gfc_option.max_continue_free = 39;
 694       gfc_option.max_identifier_length = 31;
 695       warn_ampersand = 1;
 696       warn_tabs = 1;
 697       break;
 698
 699     case OPT_std_f2003:
 700       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F77
 701         | GFC_STD_F2003 | GFC_STD_F95 | GFC_STD_F2008_OBS;
 702       gfc_option.warn_std = GFC_STD_F95_OBS;
 703       gfc_option.max_identifier_length = 63;
 704       warn_ampersand = 1;
 705       warn_tabs = 1;
 706       break;
 707
 708     case OPT_std_f2008:
 709       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F77
 710         | GFC_STD_F2003 | GFC_STD_F95 | GFC_STD_F2008 | GFC_STD_F2008_OBS;
 711       gfc_option.warn_std = GFC_STD_F95_OBS | GFC_STD_F2008_OBS;
 712       gfc_option.max_identifier_length = 63;
 713       warn_ampersand = 1;
 714       warn_tabs = 1;
 715       break;
 716
 717     case OPT_std_f2008ts:
 718       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F77
 719         | GFC_STD_F2003 | GFC_STD_F95 | GFC_STD_F2008 | GFC_STD_F2008_OBS
 720         | GFC_STD_F2008_TS;
 721       gfc_option.warn_std = GFC_STD_F95_OBS | GFC_STD_F2008_OBS;
 722       gfc_option.max_identifier_length = 63;
 723       warn_ampersand = 1;
 724       warn_tabs = 1;
 725       break;
 726
 727     case OPT_std_gnu:
 728       set_default_std_flags ();
 729       break;
 730
 731     case OPT_std_legacy:
 732       set_default_std_flags ();
 733       gfc_option.warn_std = 0;
 734       break;
 735
 736     case OPT_fshort_enums:
 737       /* Handled in language-independent code.  */
 738       break;
 739
 740     case OPT_fcheck_:
 741       gfc_handle_runtime_check_option (arg);
 742       break;
 743
 744     case OPT_fdec:
 745       /* Enable all DEC extensions.  */
 746       set_dec_flags (1);
 747       break;
 748
 749     case OPT_fdec_structure:
 750       flag_dec_structure = 1;
 751       break;
 752     }
 753
 754   Fortran_handle_option_auto (&global_options, &global_options_set,
 755                               scode, arg, value,
 756                               gfc_option_lang_mask (), kind,
 757                               loc, handlers, global_dc);
 758   return result;
 759 }
 760
 761
 762 /* Return a string with the options passed to the compiler; used for
 763    Fortran's compiler_options() intrinsic.  */
 764
 765 char *
 766 gfc_get_option_string (void)
 767 {
 768   unsigned j;
 769   size_t len, pos;
 770   char *result;
 771
 772   /* Allocate and return a one-character string with '\0'.  */
 773   if (!save_decoded_options_count)
 774     return XCNEWVEC (char, 1);
 775
 776   /* Determine required string length.  */
 777
 778   len = 0;
 779   for (j = 1; j < save_decoded_options_count; j++)
 780     {
 781       switch (save_decoded_options[j].opt_index)
 782         {
 783         case OPT_o:
 784         case OPT_d:
 785         case OPT_dumpbase:
 786         case OPT_dumpdir:
 787         case OPT_auxbase:
 788         case OPT_quiet:
 789         case OPT_version:
 790         case OPT_fintrinsic_modules_path:
 791         case OPT_fintrinsic_modules_path_:
 792           /* Ignore these.  */
 793           break;
 794         default:
 795           /* Ignore file names.  */
 796           if (save_decoded_options[j].orig_option_with_args_text[0] == '-')
 797             len += 1
 798                  + strlen (save_decoded_options[j].orig_option_with_args_text);
 799         }
 800     }
 801
 802   result = XCNEWVEC (char, len);
 803
 804   pos = 0;
 805   for (j = 1; j < save_decoded_options_count; j++)
 806     {
 807       switch (save_decoded_options[j].opt_index)
 808         {
 809         case OPT_o:
 810         case OPT_d:
 811         case OPT_dumpbase:
 812         case OPT_dumpdir:
 813         case OPT_auxbase:
 814         case OPT_quiet:
 815         case OPT_version:
 816         case OPT_fintrinsic_modules_path:
 817         case OPT_fintrinsic_modules_path_:
 818           /* Ignore these.  */
 819           continue;
 820
 821         case OPT_cpp_:
 822           /* Use "-cpp" rather than "-cpp=<temporary file>".  */
 823           len = 4;
 824           break;
 825
 826         default:
 827           /* Ignore file names.  */
 828           if (save_decoded_options[j].orig_option_with_args_text[0] != '-')
 829             continue;
 830
 831           len = strlen (save_decoded_options[j].orig_option_with_args_text);
 832         }
 833
 834       memcpy (&result[pos], save_decoded_options[j].orig_option_with_args_text, len);
 835       pos += len;
 836       result[pos++] = ' ';
 837     }
 838
 839   result[--pos] = '\0';
 840   return result;
 841 }