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