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 we call BLAS directly, only inline up to the BLAS limit.  */
 392
 393   if (flag_external_blas && flag_inline_matmul_limit < 0)
 394     flag_inline_matmul_limit = flag_blas_matmul_limit;
 395
 396   /* Optimization implies front end optimization, unless the user
 397      specified it directly.  */
 398
 399   if (flag_frontend_optimize == -1)
 400     flag_frontend_optimize = optimize;
 401
 402   if (flag_max_array_constructor < 65535)
 403     flag_max_array_constructor = 65535;
 404
 405   if (flag_fixed_line_length != 0 && flag_fixed_line_length < 7)
 406     gfc_fatal_error ("Fixed line length must be at least seven");
 407
 408   if (flag_free_line_length != 0 && flag_free_line_length < 4)
 409     gfc_fatal_error ("Free line length must be at least three");
 410
 411   if (flag_max_subrecord_length > MAX_SUBRECORD_LENGTH)
 412     gfc_fatal_error ("Maximum subrecord length cannot exceed %d",
 413                      MAX_SUBRECORD_LENGTH);
 414
 415   gfc_cpp_post_options ();
 416
 417   if (gfc_option.allow_std & GFC_STD_F2008)
 418     lang_hooks.name = "GNU Fortran2008";
 419   else if (gfc_option.allow_std & GFC_STD_F2003)
 420     lang_hooks.name = "GNU Fortran2003";
 421
 422   return gfc_cpp_preprocess_only ();
 423 }
 424
 425
 426 static void
 427 gfc_handle_module_path_options (const char *arg)
 428 {
 429
 430   if (gfc_option.module_dir != NULL)
 431     gfc_fatal_error ("gfortran: Only one %<-J%> option allowed");
 432
 433   gfc_option.module_dir = XCNEWVEC (char, strlen (arg) + 2);
 434   strcpy (gfc_option.module_dir, arg);
 435
 436   gfc_add_include_path (gfc_option.module_dir, true, false, true);
 437
 438   strcat (gfc_option.module_dir, "/");
 439 }
 440
 441
 442 /* Handle options -ffpe-trap= and -ffpe-summary=.  */
 443
 444 static void
 445 gfc_handle_fpe_option (const char *arg, bool trap)
 446 {
 447   int result, pos = 0, n;
 448   /* precision is a backwards compatibility alias for inexact.  */
 449   static const char * const exception[] = { "invalid", "denormal", "zero",
 450                                             "overflow", "underflow",
 451                                             "inexact", "precision", NULL };
 452   static const int opt_exception[] = { GFC_FPE_INVALID, GFC_FPE_DENORMAL,
 453                                        GFC_FPE_ZERO, GFC_FPE_OVERFLOW,
 454                                        GFC_FPE_UNDERFLOW, GFC_FPE_INEXACT,
 455                                        GFC_FPE_INEXACT,
 456                                        0 };
 457
 458   /* As the default for -ffpe-summary= is nonzero, set it to 0.  */
 459   if (!trap)
 460     gfc_option.fpe_summary = 0;
 461
 462   while (*arg)
 463     {
 464       while (*arg == ',')
 465         arg++;
 466
 467       while (arg[pos] && arg[pos] != ',')
 468         pos++;
 469
 470       result = 0;
 471       if (!trap && strncmp ("none", arg, pos) == 0)
 472         {
 473           gfc_option.fpe_summary = 0;
 474           arg += pos;
 475           pos = 0;
 476           continue;
 477         }
 478       else if (!trap && strncmp ("all", arg, pos) == 0)
 479         {
 480           gfc_option.fpe_summary = GFC_FPE_INVALID | GFC_FPE_DENORMAL
 481                                    | GFC_FPE_ZERO | GFC_FPE_OVERFLOW
 482                                    | GFC_FPE_UNDERFLOW | GFC_FPE_INEXACT;
 483           arg += pos;
 484           pos = 0;
 485           continue;
 486         }
 487       else
 488         for (n = 0; exception[n] != NULL; n++)
 489           {
 490           if (exception[n] && strncmp (exception[n], arg, pos) == 0)
 491             {
 492               if (trap)
 493                 gfc_option.fpe |= opt_exception[n];
 494               else
 495                 gfc_option.fpe_summary |= opt_exception[n];
 496               arg += pos;
 497               pos = 0;
 498               result = 1;
 499               break;
 500             }
 501           }
 502       if (!result && !trap)
 503         gfc_fatal_error ("Argument to %<-ffpe-trap%> is not valid: %s", arg);
 504       else if (!result)
 505         gfc_fatal_error ("Argument to %<-ffpe-summary%> is not valid: %s", arg);
 506
 507     }
 508 }
 509
 510
 511 static void
 512 gfc_handle_runtime_check_option (const char *arg)
 513 {
 514   int result, pos = 0, n;
 515   static const char * const optname[] = { "all", "bounds", "array-temps",
 516                                           "recursion", "do", "pointer",
 517                                           "mem", NULL };
 518   static const int optmask[] = { GFC_RTCHECK_ALL, GFC_RTCHECK_BOUNDS,
 519                                  GFC_RTCHECK_ARRAY_TEMPS,
 520                                  GFC_RTCHECK_RECURSION, GFC_RTCHECK_DO,
 521                                  GFC_RTCHECK_POINTER, GFC_RTCHECK_MEM,
 522                                  0 };
 523
 524   while (*arg)
 525     {
 526       while (*arg == ',')
 527         arg++;
 528
 529       while (arg[pos] && arg[pos] != ',')
 530         pos++;
 531
 532       result = 0;
 533       for (n = 0; optname[n] != NULL; n++)
 534         {
 535           if (optname[n] && strncmp (optname[n], arg, pos) == 0)
 536             {
 537               gfc_option.rtcheck |= optmask[n];
 538               arg += pos;
 539               pos = 0;
 540               result = 1;
 541               break;
 542             }
 543           else if (optname[n] && pos > 3 && strncmp ("no-", arg, 3) == 0
 544                    && strncmp (optname[n], arg+3, pos-3) == 0)
 545             {
 546               gfc_option.rtcheck &= ~optmask[n];
 547               arg += pos;
 548               pos = 0;
 549               result = 1;
 550               break;
 551             }
 552         }
 553       if (!result)
 554         gfc_fatal_error ("Argument to %<-fcheck%> is not valid: %s", arg);
 555     }
 556 }
 557
 558
 559 /* Handle command-line options.  Returns 0 if unrecognized, 1 if
 560    recognized and handled.  */
 561
 562 bool
 563 gfc_handle_option (size_t scode, const char *arg, int value,
 564                    int kind ATTRIBUTE_UNUSED, location_t loc ATTRIBUTE_UNUSED,
 565                    const struct cl_option_handlers *handlers ATTRIBUTE_UNUSED)
 566 {
 567   bool result = true;
 568   enum opt_code code = (enum opt_code) scode;
 569
 570   if (gfc_cpp_handle_option (scode, arg, value) == 1)
 571     return true;
 572
 573   switch (code)
 574     {
 575     default:
 576       if (cl_options[code].flags & gfc_option_lang_mask ())
 577         break;
 578       result = false;
 579       break;
 580
 581     case OPT_fcheck_array_temporaries:
 582       gfc_option.rtcheck |= GFC_RTCHECK_ARRAY_TEMPS;
 583       break;
 584
 585     case OPT_fd_lines_as_code:
 586       gfc_option.flag_d_lines = 1;
 587       break;
 588
 589     case OPT_fd_lines_as_comments:
 590       gfc_option.flag_d_lines = 0;
 591       break;
 592
 593     case OPT_ffixed_form:
 594       gfc_option.source_form = FORM_FIXED;
 595       break;
 596
 597     case OPT_ffree_form:
 598       gfc_option.source_form = FORM_FREE;
 599       break;
 600
 601     case OPT_static_libgfortran:
 602 #ifndef HAVE_LD_STATIC_DYNAMIC
 603       gfc_fatal_error ("%<-static-libgfortran%> is not supported in this "
 604                        "configuration");
 605 #endif
 606       break;
 607
 608     case OPT_fintrinsic_modules_path:
 609     case OPT_fintrinsic_modules_path_:
 610
 611       /* This is needed because omp_lib.h is in a directory together
 612          with intrinsic modules.  Do no warn because during testing
 613          without an installed compiler, we would get lots of bogus
 614          warnings for a missing include directory.  */
 615       gfc_add_include_path (arg, false, false, false);
 616
 617       gfc_add_intrinsic_modules_path (arg);
 618       break;
 619
 620     case OPT_fpreprocessed:
 621       gfc_option.flag_preprocessed = value;
 622       break;
 623
 624     case OPT_fmax_identifier_length_:
 625       if (value > GFC_MAX_SYMBOL_LEN)
 626         gfc_fatal_error ("Maximum supported identifier length is %d",
 627                          GFC_MAX_SYMBOL_LEN);
 628       gfc_option.max_identifier_length = value;
 629       break;
 630
 631     case OPT_finit_local_zero:
 632       gfc_option.flag_init_integer = GFC_INIT_INTEGER_ON;
 633       gfc_option.flag_init_integer_value = 0;
 634       flag_init_real = GFC_INIT_REAL_ZERO;
 635       gfc_option.flag_init_logical = GFC_INIT_LOGICAL_FALSE;
 636       gfc_option.flag_init_character = GFC_INIT_CHARACTER_ON;
 637       gfc_option.flag_init_character_value = (char)0;
 638       break;
 639
 640     case OPT_finit_logical_:
 641       if (!strcasecmp (arg, "false"))
 642         gfc_option.flag_init_logical = GFC_INIT_LOGICAL_FALSE;
 643       else if (!strcasecmp (arg, "true"))
 644         gfc_option.flag_init_logical = GFC_INIT_LOGICAL_TRUE;
 645       else
 646         gfc_fatal_error ("Unrecognized option to %<-finit-logical%>: %s",
 647                          arg);
 648       break;
 649
 650     case OPT_finit_integer_:
 651       gfc_option.flag_init_integer = GFC_INIT_INTEGER_ON;
 652       gfc_option.flag_init_integer_value = atoi (arg);
 653       break;
 654
 655     case OPT_finit_character_:
 656       if (value >= 0 && value <= 127)
 657         {
 658           gfc_option.flag_init_character = GFC_INIT_CHARACTER_ON;
 659           gfc_option.flag_init_character_value = (char)value;
 660         }
 661       else
 662         gfc_fatal_error ("The value of n in %<-finit-character=n%> must be "
 663                          "between 0 and 127");
 664       break;
 665
 666     case OPT_I:
 667       gfc_add_include_path (arg, true, false, true);
 668       break;
 669
 670     case OPT_J:
 671       gfc_handle_module_path_options (arg);
 672       break;
 673
 674     case OPT_ffpe_trap_:
 675       gfc_handle_fpe_option (arg, true);
 676       break;
 677
 678     case OPT_ffpe_summary_:
 679       gfc_handle_fpe_option (arg, false);
 680       break;
 681
 682     case OPT_std_f95:
 683       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F95 | GFC_STD_F77
 684                              | GFC_STD_F2008_OBS;
 685       gfc_option.warn_std = GFC_STD_F95_OBS;
 686       gfc_option.max_continue_fixed = 19;
 687       gfc_option.max_continue_free = 39;
 688       gfc_option.max_identifier_length = 31;
 689       warn_ampersand = 1;
 690       warn_tabs = 1;
 691       break;
 692
 693     case OPT_std_f2003:
 694       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F77
 695         | GFC_STD_F2003 | GFC_STD_F95 | GFC_STD_F2008_OBS;
 696       gfc_option.warn_std = GFC_STD_F95_OBS;
 697       gfc_option.max_identifier_length = 63;
 698       warn_ampersand = 1;
 699       warn_tabs = 1;
 700       break;
 701
 702     case OPT_std_f2008:
 703       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F77
 704         | GFC_STD_F2003 | GFC_STD_F95 | GFC_STD_F2008 | GFC_STD_F2008_OBS;
 705       gfc_option.warn_std = GFC_STD_F95_OBS | GFC_STD_F2008_OBS;
 706       gfc_option.max_identifier_length = 63;
 707       warn_ampersand = 1;
 708       warn_tabs = 1;
 709       break;
 710
 711     case OPT_std_f2008ts:
 712       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F77
 713         | GFC_STD_F2003 | GFC_STD_F95 | GFC_STD_F2008 | GFC_STD_F2008_OBS
 714         | GFC_STD_F2008_TS;
 715       gfc_option.warn_std = GFC_STD_F95_OBS | GFC_STD_F2008_OBS;
 716       gfc_option.max_identifier_length = 63;
 717       warn_ampersand = 1;
 718       warn_tabs = 1;
 719       break;
 720
 721     case OPT_std_gnu:
 722       set_default_std_flags ();
 723       break;
 724
 725     case OPT_std_legacy:
 726       set_default_std_flags ();
 727       gfc_option.warn_std = 0;
 728       break;
 729
 730     case OPT_fshort_enums:
 731       /* Handled in language-independent code.  */
 732       break;
 733
 734     case OPT_fcheck_:
 735       gfc_handle_runtime_check_option (arg);
 736       break;
 737
 738     case OPT_fdec:
 739       /* Enable all DEC extensions.  */
 740       set_dec_flags (1);
 741       break;
 742
 743     case OPT_fdec_structure:
 744       flag_dec_structure = 1;
 745       break;
 746     }
 747
 748   Fortran_handle_option_auto (&global_options, &global_options_set,
 749                               scode, arg, value,
 750                               gfc_option_lang_mask (), kind,
 751                               loc, handlers, global_dc);
 752   return result;
 753 }
 754
 755
 756 /* Return a string with the options passed to the compiler; used for
 757    Fortran's compiler_options() intrinsic.  */
 758
 759 char *
 760 gfc_get_option_string (void)
 761 {
 762   unsigned j;
 763   size_t len, pos;
 764   char *result;
 765
 766   /* Allocate and return a one-character string with '\0'.  */
 767   if (!save_decoded_options_count)
 768     return XCNEWVEC (char, 1);
 769
 770   /* Determine required string length.  */
 771
 772   len = 0;
 773   for (j = 1; j < save_decoded_options_count; j++)
 774     {
 775       switch (save_decoded_options[j].opt_index)
 776         {
 777         case OPT_o:
 778         case OPT_d:
 779         case OPT_dumpbase:
 780         case OPT_dumpdir:
 781         case OPT_auxbase:
 782         case OPT_quiet:
 783         case OPT_version:
 784         case OPT_fintrinsic_modules_path:
 785         case OPT_fintrinsic_modules_path_:
 786           /* Ignore these.  */
 787           break;
 788         default:
 789           /* Ignore file names.  */
 790           if (save_decoded_options[j].orig_option_with_args_text[0] == '-')
 791             len += 1
 792                  + strlen (save_decoded_options[j].orig_option_with_args_text);
 793         }
 794     }
 795
 796   result = XCNEWVEC (char, len);
 797
 798   pos = 0;
 799   for (j = 1; j < save_decoded_options_count; j++)
 800     {
 801       switch (save_decoded_options[j].opt_index)
 802         {
 803         case OPT_o:
 804         case OPT_d:
 805         case OPT_dumpbase:
 806         case OPT_dumpdir:
 807         case OPT_auxbase:
 808         case OPT_quiet:
 809         case OPT_version:
 810         case OPT_fintrinsic_modules_path:
 811         case OPT_fintrinsic_modules_path_:
 812           /* Ignore these.  */
 813           continue;
 814
 815         case OPT_cpp_:
 816           /* Use "-cpp" rather than "-cpp=<temporary file>".  */
 817           len = 4;
 818           break;
 819
 820         default:
 821           /* Ignore file names.  */
 822           if (save_decoded_options[j].orig_option_with_args_text[0] != '-')
 823             continue;
 824
 825           len = strlen (save_decoded_options[j].orig_option_with_args_text);
 826         }
 827
 828       memcpy (&result[pos], save_decoded_options[j].orig_option_with_args_text, len);
 829       pos += len;
 830       result[pos++] = ' ';
 831     }
 832
 833   result[--pos] = '\0';
 834   return result;
 835 }