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