gcc/fortran/options.c

   1 /* Parse and display command line options.
   2    Copyright (C) 2000-2016 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     gfc_option.flag_dec_structure  = value;
  56 }
  57
  58
  59 /* Return language mask for Fortran options.  */
  60
  61 unsigned int
  62 gfc_option_lang_mask (void)
  63 {
  64   return CL_Fortran;
  65 }
  66
  67 /* Initialize options structure OPTS.  */
  68
  69 void
  70 gfc_init_options_struct (struct gcc_options *opts)
  71 {
  72   opts->x_flag_errno_math = 0;
  73   opts->frontend_set_flag_errno_math = true;
  74   opts->x_flag_associative_math = -1;
  75   opts->frontend_set_flag_associative_math = true;
  76 }
  77
  78 /* Get ready for options handling. Keep in sync with
  79    libgfortran/runtime/compile_options.c (init_compile_options).  */
  80
  81 void
  82 gfc_init_options (unsigned int decoded_options_count,
  83                   struct cl_decoded_option *decoded_options)
  84 {
  85   gfc_source_file = NULL;
  86   gfc_option.module_dir = NULL;
  87   gfc_option.source_form = FORM_UNKNOWN;
  88   gfc_option.max_continue_fixed = 255;
  89   gfc_option.max_continue_free = 255;
  90   gfc_option.max_identifier_length = GFC_MAX_SYMBOL_LEN;
  91   gfc_option.max_errors = 25;
  92
  93   gfc_option.flag_preprocessed = 0;
  94   gfc_option.flag_d_lines = -1;
  95   gfc_option.flag_init_integer = GFC_INIT_INTEGER_OFF;
  96   gfc_option.flag_init_integer_value = 0;
  97   gfc_option.flag_init_logical = GFC_INIT_LOGICAL_OFF;
  98   gfc_option.flag_init_character = GFC_INIT_CHARACTER_OFF;
  99   gfc_option.flag_init_character_value = (char)0;
 100
 101   gfc_option.fpe = 0;
 102   /* All except GFC_FPE_INEXACT.  */
 103   gfc_option.fpe_summary = GFC_FPE_INVALID | GFC_FPE_DENORMAL
 104                            | GFC_FPE_ZERO | GFC_FPE_OVERFLOW
 105                            | GFC_FPE_UNDERFLOW;
 106   gfc_option.rtcheck = 0;
 107
 108   /* ??? Wmissing-include-dirs is disabled by default in C/C++ but
 109      enabled by default in Fortran.  Ideally, we should express this
 110      in .opt, but that is not supported yet.  */
 111   if (!global_options_set.x_cpp_warn_missing_include_dirs)
 112     global_options.x_cpp_warn_missing_include_dirs = 1;
 113
 114   set_dec_flags (0);
 115
 116   set_default_std_flags ();
 117
 118   /* Initialize cpp-related options.  */
 119   gfc_cpp_init_options (decoded_options_count, decoded_options);
 120   gfc_diagnostics_init ();
 121 }
 122
 123
 124 /* Determine the source form from the filename extension.  We assume
 125    case insensitivity.  */
 126
 127 static gfc_source_form
 128 form_from_filename (const char *filename)
 129 {
 130   static const struct
 131   {
 132     const char *extension;
 133     gfc_source_form form;
 134   }
 135   exttype[] =
 136   {
 137     {
 138     ".f90", FORM_FREE}
 139     ,
 140     {
 141     ".f95", FORM_FREE}
 142     ,
 143     {
 144     ".f03", FORM_FREE}
 145     ,
 146     {
 147     ".f08", FORM_FREE}
 148     ,
 149     {
 150     ".f", FORM_FIXED}
 151     ,
 152     {
 153     ".for", FORM_FIXED}
 154     ,
 155     {
 156     ".ftn", FORM_FIXED}
 157     ,
 158     {
 159     "", FORM_UNKNOWN}
 160   };            /* sentinel value */
 161
 162   gfc_source_form f_form;
 163   const char *fileext;
 164   int i;
 165
 166   /* Find end of file name.  Note, filename is either a NULL pointer or
 167      a NUL terminated string.  */
 168   i = 0;
 169   while (filename[i] != '\0')
 170     i++;
 171
 172   /* Find last period.  */
 173   while (i >= 0 && (filename[i] != '.'))
 174     i--;
 175
 176   /* Did we see a file extension?  */
 177   if (i < 0)
 178     return FORM_UNKNOWN; /* Nope  */
 179
 180   /* Get file extension and compare it to others.  */
 181   fileext = &(filename[i]);
 182
 183   i = -1;
 184   f_form = FORM_UNKNOWN;
 185   do
 186     {
 187       i++;
 188       if (strcasecmp (fileext, exttype[i].extension) == 0)
 189         {
 190           f_form = exttype[i].form;
 191           break;
 192         }
 193     }
 194   while (exttype[i].form != FORM_UNKNOWN);
 195
 196   return f_form;
 197 }
 198
 199
 200 /* Finalize commandline options.  */
 201
 202 bool
 203 gfc_post_options (const char **pfilename)
 204 {
 205   const char *filename = *pfilename, *canon_source_file = NULL;
 206   char *source_path;
 207   int i;
 208
 209   /* Excess precision other than "fast" requires front-end
 210      support.  */
 211   if (flag_excess_precision_cmdline == EXCESS_PRECISION_STANDARD
 212       && TARGET_FLT_EVAL_METHOD_NON_DEFAULT)
 213     sorry ("-fexcess-precision=standard for Fortran");
 214   flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
 215
 216   /* Fortran allows associative math - but we cannot reassociate if
 217      we want traps or signed zeros. Cf. also flag_protect_parens.  */
 218   if (flag_associative_math == -1)
 219     flag_associative_math = (!flag_trapping_math && !flag_signed_zeros);
 220
 221   if (flag_protect_parens == -1)
 222     flag_protect_parens = !optimize_fast;
 223
 224   if (flag_stack_arrays == -1)
 225     flag_stack_arrays = optimize_fast;
 226
 227   /* By default, disable (re)allocation during assignment for -std=f95,
 228      and enable it for F2003/F2008/GNU/Legacy.  */
 229   if (flag_realloc_lhs == -1)
 230     {
 231       if (gfc_option.allow_std & GFC_STD_F2003)
 232         flag_realloc_lhs = 1;
 233       else
 234         flag_realloc_lhs = 0;
 235     }
 236
 237   /* -fbounds-check is equivalent to -fcheck=bounds */
 238   if (flag_bounds_check)
 239     gfc_option.rtcheck |= GFC_RTCHECK_BOUNDS;
 240
 241   if (flag_compare_debug)
 242     flag_dump_fortran_original = 0;
 243
 244   /* Make -fmax-errors visible to gfortran's diagnostic machinery.  */
 245   if (global_options_set.x_flag_max_errors)
 246     gfc_option.max_errors = flag_max_errors;
 247
 248   /* Verify the input file name.  */
 249   if (!filename || strcmp (filename, "-") == 0)
 250     {
 251       filename = "";
 252     }
 253
 254   if (gfc_option.flag_preprocessed)
 255     {
 256       /* For preprocessed files, if the first tokens are of the form # NUM.
 257          handle the directives so we know the original file name.  */
 258       gfc_source_file = gfc_read_orig_filename (filename, &canon_source_file);
 259       if (gfc_source_file == NULL)
 260         gfc_source_file = filename;
 261       else
 262         *pfilename = gfc_source_file;
 263     }
 264   else
 265     gfc_source_file = filename;
 266
 267   if (canon_source_file == NULL)
 268     canon_source_file = gfc_source_file;
 269
 270   /* Adds the path where the source file is to the list of include files.  */
 271
 272   i = strlen (canon_source_file);
 273   while (i > 0 && !IS_DIR_SEPARATOR (canon_source_file[i]))
 274     i--;
 275
 276   if (i != 0)
 277     {
 278       source_path = (char *) alloca (i + 1);
 279       memcpy (source_path, canon_source_file, i);
 280       source_path[i] = 0;
 281       gfc_add_include_path (source_path, true, true, true);
 282     }
 283   else
 284     gfc_add_include_path (".", true, true, true);
 285
 286   if (canon_source_file != gfc_source_file)
 287     free (CONST_CAST (char *, canon_source_file));
 288
 289   /* Decide which form the file will be read in as.  */
 290
 291   if (gfc_option.source_form != FORM_UNKNOWN)
 292     gfc_current_form = gfc_option.source_form;
 293   else
 294     {
 295       gfc_current_form = form_from_filename (filename);
 296
 297       if (gfc_current_form == FORM_UNKNOWN)
 298         {
 299           gfc_current_form = FORM_FREE;
 300           gfc_warning_now (0, "Reading file %qs as free form",
 301                            (filename[0] == '\0') ? "<stdin>" : filename);
 302         }
 303     }
 304
 305   /* If the user specified -fd-lines-as-{code|comments} verify that we're
 306      in fixed form.  */
 307   if (gfc_current_form == FORM_FREE)
 308     {
 309       if (gfc_option.flag_d_lines == 0)
 310         gfc_warning_now (0, "%<-fd-lines-as-comments%> has no effect "
 311                            "in free form");
 312       else if (gfc_option.flag_d_lines == 1)
 313         gfc_warning_now (0, "%<-fd-lines-as-code%> has no effect in free form");
 314
 315       if (warn_line_truncation == -1)
 316           warn_line_truncation = 1;
 317
 318       /* Enable -Werror=line-truncation when -Werror and -Wno-error have
 319          not been set.  */
 320       if (warn_line_truncation && !global_options_set.x_warnings_are_errors
 321           && (global_dc->classify_diagnostic[OPT_Wline_truncation] ==
 322               DK_UNSPECIFIED))
 323         diagnostic_classify_diagnostic (global_dc, OPT_Wline_truncation,
 324                                         DK_ERROR, UNKNOWN_LOCATION);
 325     }
 326   else if (warn_line_truncation == -1)
 327     warn_line_truncation = 0;
 328
 329   /* If -pedantic, warn about the use of GNU extensions.  */
 330   if (pedantic && (gfc_option.allow_std & GFC_STD_GNU) != 0)
 331     gfc_option.warn_std |= GFC_STD_GNU;
 332   /* -std=legacy -pedantic is effectively -std=gnu.  */
 333   if (pedantic && (gfc_option.allow_std & GFC_STD_LEGACY) != 0)
 334     gfc_option.warn_std |= GFC_STD_F95_OBS | GFC_STD_F95_DEL | GFC_STD_LEGACY;
 335
 336   /* If the user didn't explicitly specify -f(no)-second-underscore we
 337      use it if we're trying to be compatible with f2c, and not
 338      otherwise.  */
 339   if (flag_second_underscore == -1)
 340     flag_second_underscore = flag_f2c;
 341
 342   if (!flag_automatic && flag_max_stack_var_size != -2
 343       && flag_max_stack_var_size != 0)
 344     gfc_warning_now (0, "Flag %<-fno-automatic%> overwrites %<-fmax-stack-var-size=%d%>",
 345                      flag_max_stack_var_size);
 346   else if (!flag_automatic && flag_recursive)
 347     gfc_warning_now (0, "Flag %<-fno-automatic%> overwrites %<-frecursive%>");
 348   else if (!flag_automatic && flag_openmp)
 349     gfc_warning_now (0, "Flag %<-fno-automatic%> overwrites %<-frecursive%> implied by "
 350                      "%<-fopenmp%>");
 351   else if (flag_max_stack_var_size != -2 && flag_recursive)
 352     gfc_warning_now (0, "Flag %<-frecursive%> overwrites %<-fmax-stack-var-size=%d%>",
 353                      flag_max_stack_var_size);
 354   else if (flag_max_stack_var_size != -2 && flag_openmp)
 355     gfc_warning_now (0, "Flag %<-fmax-stack-var-size=%d%> overwrites %<-frecursive%> "
 356                      "implied by %<-fopenmp%>", flag_max_stack_var_size);
 357
 358   /* Implement -frecursive as -fmax-stack-var-size=-1.  */
 359   if (flag_recursive)
 360     flag_max_stack_var_size = -1;
 361
 362   /* Implied -frecursive; implemented as -fmax-stack-var-size=-1.  */
 363   if (flag_max_stack_var_size == -2 && flag_openmp && flag_automatic)
 364     {
 365       flag_recursive = 1;
 366       flag_max_stack_var_size = -1;
 367     }
 368
 369   /* Set default.  */
 370   if (flag_max_stack_var_size == -2)
 371     flag_max_stack_var_size = 32768;
 372
 373   /* Implement -fno-automatic as -fmax-stack-var-size=0.  */
 374   if (!flag_automatic)
 375     flag_max_stack_var_size = 0;
 376
 377   /* If we call BLAS directly, only inline up to the BLAS limit.  */
 378
 379   if (flag_external_blas && flag_inline_matmul_limit < 0)
 380     flag_inline_matmul_limit = flag_blas_matmul_limit;
 381
 382   /* Optimization implies front end optimization, unless the user
 383      specified it directly.  */
 384
 385   if (flag_frontend_optimize == -1)
 386     flag_frontend_optimize = optimize;
 387
 388   if (flag_max_array_constructor < 65535)
 389     flag_max_array_constructor = 65535;
 390
 391   if (flag_fixed_line_length != 0 && flag_fixed_line_length < 7)
 392     gfc_fatal_error ("Fixed line length must be at least seven");
 393
 394   if (flag_free_line_length != 0 && flag_free_line_length < 4)
 395     gfc_fatal_error ("Free line length must be at least three");
 396
 397   if (flag_max_subrecord_length > MAX_SUBRECORD_LENGTH)
 398     gfc_fatal_error ("Maximum subrecord length cannot exceed %d",
 399                      MAX_SUBRECORD_LENGTH);
 400
 401   gfc_cpp_post_options ();
 402
 403   if (gfc_option.allow_std & GFC_STD_F2008)
 404     lang_hooks.name = "GNU Fortran2008";
 405   else if (gfc_option.allow_std & GFC_STD_F2003)
 406     lang_hooks.name = "GNU Fortran2003";
 407
 408   return gfc_cpp_preprocess_only ();
 409 }
 410
 411
 412 static void
 413 gfc_handle_module_path_options (const char *arg)
 414 {
 415
 416   if (gfc_option.module_dir != NULL)
 417     gfc_fatal_error ("gfortran: Only one %<-J%> option allowed");
 418
 419   gfc_option.module_dir = XCNEWVEC (char, strlen (arg) + 2);
 420   strcpy (gfc_option.module_dir, arg);
 421
 422   gfc_add_include_path (gfc_option.module_dir, true, false, true);
 423
 424   strcat (gfc_option.module_dir, "/");
 425 }
 426
 427
 428 /* Handle options -ffpe-trap= and -ffpe-summary=.  */
 429
 430 static void
 431 gfc_handle_fpe_option (const char *arg, bool trap)
 432 {
 433   int result, pos = 0, n;
 434   /* precision is a backwards compatibility alias for inexact.  */
 435   static const char * const exception[] = { "invalid", "denormal", "zero",
 436                                             "overflow", "underflow",
 437                                             "inexact", "precision", NULL };
 438   static const int opt_exception[] = { GFC_FPE_INVALID, GFC_FPE_DENORMAL,
 439                                        GFC_FPE_ZERO, GFC_FPE_OVERFLOW,
 440                                        GFC_FPE_UNDERFLOW, GFC_FPE_INEXACT,
 441                                        GFC_FPE_INEXACT,
 442                                        0 };
 443
 444   /* As the default for -ffpe-summary= is nonzero, set it to 0.  */
 445   if (!trap)
 446     gfc_option.fpe_summary = 0;
 447
 448   while (*arg)
 449     {
 450       while (*arg == ',')
 451         arg++;
 452
 453       while (arg[pos] && arg[pos] != ',')
 454         pos++;
 455
 456       result = 0;
 457       if (!trap && strncmp ("none", arg, pos) == 0)
 458         {
 459           gfc_option.fpe_summary = 0;
 460           arg += pos;
 461           pos = 0;
 462           continue;
 463         }
 464       else if (!trap && strncmp ("all", arg, pos) == 0)
 465         {
 466           gfc_option.fpe_summary = GFC_FPE_INVALID | GFC_FPE_DENORMAL
 467                                    | GFC_FPE_ZERO | GFC_FPE_OVERFLOW
 468                                    | GFC_FPE_UNDERFLOW | GFC_FPE_INEXACT;
 469           arg += pos;
 470           pos = 0;
 471           continue;
 472         }
 473       else
 474         for (n = 0; exception[n] != NULL; n++)
 475           {
 476           if (exception[n] && strncmp (exception[n], arg, pos) == 0)
 477             {
 478               if (trap)
 479                 gfc_option.fpe |= opt_exception[n];
 480               else
 481                 gfc_option.fpe_summary |= opt_exception[n];
 482               arg += pos;
 483               pos = 0;
 484               result = 1;
 485               break;
 486             }
 487           }
 488       if (!result && !trap)
 489         gfc_fatal_error ("Argument to %<-ffpe-trap%> is not valid: %s", arg);
 490       else if (!result)
 491         gfc_fatal_error ("Argument to %<-ffpe-summary%> is not valid: %s", arg);
 492
 493     }
 494 }
 495
 496
 497 static void
 498 gfc_handle_runtime_check_option (const char *arg)
 499 {
 500   int result, pos = 0, n;
 501   static const char * const optname[] = { "all", "bounds", "array-temps",
 502                                           "recursion", "do", "pointer",
 503                                           "mem", NULL };
 504   static const int optmask[] = { GFC_RTCHECK_ALL, GFC_RTCHECK_BOUNDS,
 505                                  GFC_RTCHECK_ARRAY_TEMPS,
 506                                  GFC_RTCHECK_RECURSION, GFC_RTCHECK_DO,
 507                                  GFC_RTCHECK_POINTER, GFC_RTCHECK_MEM,
 508                                  0 };
 509
 510   while (*arg)
 511     {
 512       while (*arg == ',')
 513         arg++;
 514
 515       while (arg[pos] && arg[pos] != ',')
 516         pos++;
 517
 518       result = 0;
 519       for (n = 0; optname[n] != NULL; n++)
 520         {
 521           if (optname[n] && strncmp (optname[n], arg, pos) == 0)
 522             {
 523               gfc_option.rtcheck |= optmask[n];
 524               arg += pos;
 525               pos = 0;
 526               result = 1;
 527               break;
 528             }
 529           else if (optname[n] && pos > 3 && strncmp ("no-", arg, 3) == 0
 530                    && strncmp (optname[n], arg+3, pos-3) == 0)
 531             {
 532               gfc_option.rtcheck &= ~optmask[n];
 533               arg += pos;
 534               pos = 0;
 535               result = 1;
 536               break;
 537             }
 538         }
 539       if (!result)
 540         gfc_fatal_error ("Argument to %<-fcheck%> is not valid: %s", arg);
 541     }
 542 }
 543
 544
 545 /* Handle command-line options.  Returns 0 if unrecognized, 1 if
 546    recognized and handled.  */
 547
 548 bool
 549 gfc_handle_option (size_t scode, const char *arg, int value,
 550                    int kind ATTRIBUTE_UNUSED, location_t loc ATTRIBUTE_UNUSED,
 551                    const struct cl_option_handlers *handlers ATTRIBUTE_UNUSED)
 552 {
 553   bool result = true;
 554   enum opt_code code = (enum opt_code) scode;
 555
 556   if (gfc_cpp_handle_option (scode, arg, value) == 1)
 557     return true;
 558
 559   switch (code)
 560     {
 561     default:
 562       if (cl_options[code].flags & gfc_option_lang_mask ())
 563         break;
 564       result = false;
 565       break;
 566
 567     case OPT_fcheck_array_temporaries:
 568       gfc_option.rtcheck |= GFC_RTCHECK_ARRAY_TEMPS;
 569       break;
 570
 571     case OPT_fd_lines_as_code:
 572       gfc_option.flag_d_lines = 1;
 573       break;
 574
 575     case OPT_fd_lines_as_comments:
 576       gfc_option.flag_d_lines = 0;
 577       break;
 578
 579     case OPT_ffixed_form:
 580       gfc_option.source_form = FORM_FIXED;
 581       break;
 582
 583     case OPT_ffree_form:
 584       gfc_option.source_form = FORM_FREE;
 585       break;
 586
 587     case OPT_static_libgfortran:
 588 #ifndef HAVE_LD_STATIC_DYNAMIC
 589       gfc_fatal_error ("%<-static-libgfortran%> is not supported in this "
 590                        "configuration");
 591 #endif
 592       break;
 593
 594     case OPT_fintrinsic_modules_path:
 595     case OPT_fintrinsic_modules_path_:
 596
 597       /* This is needed because omp_lib.h is in a directory together
 598          with intrinsic modules.  Do no warn because during testing
 599          without an installed compiler, we would get lots of bogus
 600          warnings for a missing include directory.  */
 601       gfc_add_include_path (arg, false, false, false);
 602
 603       gfc_add_intrinsic_modules_path (arg);
 604       break;
 605
 606     case OPT_fpreprocessed:
 607       gfc_option.flag_preprocessed = value;
 608       break;
 609
 610     case OPT_fmax_identifier_length_:
 611       if (value > GFC_MAX_SYMBOL_LEN)
 612         gfc_fatal_error ("Maximum supported identifier length is %d",
 613                          GFC_MAX_SYMBOL_LEN);
 614       gfc_option.max_identifier_length = value;
 615       break;
 616
 617     case OPT_finit_local_zero:
 618       gfc_option.flag_init_integer = GFC_INIT_INTEGER_ON;
 619       gfc_option.flag_init_integer_value = 0;
 620       flag_init_real = GFC_INIT_REAL_ZERO;
 621       gfc_option.flag_init_logical = GFC_INIT_LOGICAL_FALSE;
 622       gfc_option.flag_init_character = GFC_INIT_CHARACTER_ON;
 623       gfc_option.flag_init_character_value = (char)0;
 624       break;
 625
 626     case OPT_finit_logical_:
 627       if (!strcasecmp (arg, "false"))
 628         gfc_option.flag_init_logical = GFC_INIT_LOGICAL_FALSE;
 629       else if (!strcasecmp (arg, "true"))
 630         gfc_option.flag_init_logical = GFC_INIT_LOGICAL_TRUE;
 631       else
 632         gfc_fatal_error ("Unrecognized option to %<-finit-logical%>: %s",
 633                          arg);
 634       break;
 635
 636     case OPT_finit_integer_:
 637       gfc_option.flag_init_integer = GFC_INIT_INTEGER_ON;
 638       gfc_option.flag_init_integer_value = atoi (arg);
 639       break;
 640
 641     case OPT_finit_character_:
 642       if (value >= 0 && value <= 127)
 643         {
 644           gfc_option.flag_init_character = GFC_INIT_CHARACTER_ON;
 645           gfc_option.flag_init_character_value = (char)value;
 646         }
 647       else
 648         gfc_fatal_error ("The value of n in %<-finit-character=n%> must be "
 649                          "between 0 and 127");
 650       break;
 651
 652     case OPT_I:
 653       gfc_add_include_path (arg, true, false, true);
 654       break;
 655
 656     case OPT_J:
 657       gfc_handle_module_path_options (arg);
 658       break;
 659
 660     case OPT_ffpe_trap_:
 661       gfc_handle_fpe_option (arg, true);
 662       break;
 663
 664     case OPT_ffpe_summary_:
 665       gfc_handle_fpe_option (arg, false);
 666       break;
 667
 668     case OPT_std_f95:
 669       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F95 | GFC_STD_F77
 670                              | GFC_STD_F2008_OBS;
 671       gfc_option.warn_std = GFC_STD_F95_OBS;
 672       gfc_option.max_continue_fixed = 19;
 673       gfc_option.max_continue_free = 39;
 674       gfc_option.max_identifier_length = 31;
 675       warn_ampersand = 1;
 676       warn_tabs = 1;
 677       break;
 678
 679     case OPT_std_f2003:
 680       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F77
 681         | GFC_STD_F2003 | GFC_STD_F95 | GFC_STD_F2008_OBS;
 682       gfc_option.warn_std = GFC_STD_F95_OBS;
 683       gfc_option.max_identifier_length = 63;
 684       warn_ampersand = 1;
 685       warn_tabs = 1;
 686       break;
 687
 688     case OPT_std_f2008:
 689       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F77
 690         | GFC_STD_F2003 | GFC_STD_F95 | GFC_STD_F2008 | GFC_STD_F2008_OBS;
 691       gfc_option.warn_std = GFC_STD_F95_OBS | GFC_STD_F2008_OBS;
 692       gfc_option.max_identifier_length = 63;
 693       warn_ampersand = 1;
 694       warn_tabs = 1;
 695       break;
 696
 697     case OPT_std_f2008ts:
 698       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F77
 699         | GFC_STD_F2003 | GFC_STD_F95 | GFC_STD_F2008 | GFC_STD_F2008_OBS
 700         | GFC_STD_F2008_TS;
 701       gfc_option.warn_std = GFC_STD_F95_OBS | GFC_STD_F2008_OBS;
 702       gfc_option.max_identifier_length = 63;
 703       warn_ampersand = 1;
 704       warn_tabs = 1;
 705       break;
 706
 707     case OPT_std_gnu:
 708       set_default_std_flags ();
 709       break;
 710
 711     case OPT_std_legacy:
 712       set_default_std_flags ();
 713       gfc_option.warn_std = 0;
 714       break;
 715
 716     case OPT_fshort_enums:
 717       /* Handled in language-independent code.  */
 718       break;
 719
 720     case OPT_fcheck_:
 721       gfc_handle_runtime_check_option (arg);
 722       break;
 723
 724     case OPT_fdec:
 725       /* Enable all DEC extensions.  */
 726       set_dec_flags (1);
 727       break;
 728
 729     case OPT_fdec_structure:
 730       gfc_option.flag_dec_structure = 1;
 731       break;
 732     }
 733
 734   Fortran_handle_option_auto (&global_options, &global_options_set,
 735                               scode, arg, value,
 736                               gfc_option_lang_mask (), kind,
 737                               loc, handlers, global_dc);
 738   return result;
 739 }
 740
 741
 742 /* Return a string with the options passed to the compiler; used for
 743    Fortran's compiler_options() intrinsic.  */
 744
 745 char *
 746 gfc_get_option_string (void)
 747 {
 748   unsigned j;
 749   size_t len, pos;
 750   char *result;
 751
 752   /* Allocate and return a one-character string with '\0'.  */
 753   if (!save_decoded_options_count)
 754     return XCNEWVEC (char, 1);
 755
 756   /* Determine required string length.  */
 757
 758   len = 0;
 759   for (j = 1; j < save_decoded_options_count; j++)
 760     {
 761       switch (save_decoded_options[j].opt_index)
 762         {
 763         case OPT_o:
 764         case OPT_d:
 765         case OPT_dumpbase:
 766         case OPT_dumpdir:
 767         case OPT_auxbase:
 768         case OPT_quiet:
 769         case OPT_version:
 770         case OPT_fintrinsic_modules_path:
 771         case OPT_fintrinsic_modules_path_:
 772           /* Ignore these.  */
 773           break;
 774         default:
 775           /* Ignore file names.  */
 776           if (save_decoded_options[j].orig_option_with_args_text[0] == '-')
 777             len += 1
 778                  + strlen (save_decoded_options[j].orig_option_with_args_text);
 779         }
 780     }
 781
 782   result = XCNEWVEC (char, len);
 783
 784   pos = 0;
 785   for (j = 1; j < save_decoded_options_count; j++)
 786     {
 787       switch (save_decoded_options[j].opt_index)
 788         {
 789         case OPT_o:
 790         case OPT_d:
 791         case OPT_dumpbase:
 792         case OPT_dumpdir:
 793         case OPT_auxbase:
 794         case OPT_quiet:
 795         case OPT_version:
 796         case OPT_fintrinsic_modules_path:
 797         case OPT_fintrinsic_modules_path_:
 798           /* Ignore these.  */
 799           continue;
 800
 801         case OPT_cpp_:
 802           /* Use "-cpp" rather than "-cpp=<temporary file>".  */
 803           len = 4;
 804           break;
 805
 806         default:
 807           /* Ignore file names.  */
 808           if (save_decoded_options[j].orig_option_with_args_text[0] != '-')
 809             continue;
 810
 811           len = strlen (save_decoded_options[j].orig_option_with_args_text);
 812         }
 813
 814       memcpy (&result[pos], save_decoded_options[j].orig_option_with_args_text, len);
 815       pos += len;
 816       result[pos++] = ' ';
 817     }
 818
 819   result[--pos] = '\0';
 820   return result;
 821 }