gcc/fortran/options.c

   1 /* Parse and display command line options.
   2    Copyright (C) 2000-2015 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 /* Return language mask for Fortran options.  */
  51
  52 unsigned int
  53 gfc_option_lang_mask (void)
  54 {
  55   return CL_Fortran;
  56 }
  57
  58 /* Initialize options structure OPTS.  */
  59
  60 void
  61 gfc_init_options_struct (struct gcc_options *opts)
  62 {
  63   opts->x_flag_errno_math = 0;
  64   opts->frontend_set_flag_errno_math = true;
  65   opts->x_flag_associative_math = -1;
  66   opts->frontend_set_flag_associative_math = true;
  67 }
  68
  69 /* Get ready for options handling. Keep in sync with
  70    libgfortran/runtime/compile_options.c (init_compile_options).  */
  71
  72 void
  73 gfc_init_options (unsigned int decoded_options_count,
  74                   struct cl_decoded_option *decoded_options)
  75 {
  76   gfc_source_file = NULL;
  77   gfc_option.module_dir = NULL;
  78   gfc_option.source_form = FORM_UNKNOWN;
  79   gfc_option.max_continue_fixed = 255;
  80   gfc_option.max_continue_free = 255;
  81   gfc_option.max_identifier_length = GFC_MAX_SYMBOL_LEN;
  82   gfc_option.max_errors = 25;
  83
  84   gfc_option.flag_preprocessed = 0;
  85   gfc_option.flag_d_lines = -1;
  86   gfc_option.flag_init_integer = GFC_INIT_INTEGER_OFF;
  87   gfc_option.flag_init_integer_value = 0;
  88   gfc_option.flag_init_logical = GFC_INIT_LOGICAL_OFF;
  89   gfc_option.flag_init_character = GFC_INIT_CHARACTER_OFF;
  90   gfc_option.flag_init_character_value = (char)0;
  91
  92   gfc_option.fpe = 0;
  93   /* All except GFC_FPE_INEXACT.  */
  94   gfc_option.fpe_summary = GFC_FPE_INVALID | GFC_FPE_DENORMAL
  95                            | GFC_FPE_ZERO | GFC_FPE_OVERFLOW
  96                            | GFC_FPE_UNDERFLOW;
  97   gfc_option.rtcheck = 0;
  98
  99   /* ??? Wmissing-include-dirs is disabled by default in C/C++ but
 100      enabled by default in Fortran.  Ideally, we should express this
 101      in .opt, but that is not supported yet.  */
 102   if (!global_options_set.x_cpp_warn_missing_include_dirs)
 103     global_options.x_cpp_warn_missing_include_dirs = 1;
 104
 105   set_default_std_flags ();
 106
 107   /* Initialize cpp-related options.  */
 108   gfc_cpp_init_options (decoded_options_count, decoded_options);
 109   gfc_diagnostics_init ();
 110 }
 111
 112
 113 /* Determine the source form from the filename extension.  We assume
 114    case insensitivity.  */
 115
 116 static gfc_source_form
 117 form_from_filename (const char *filename)
 118 {
 119   static const struct
 120   {
 121     const char *extension;
 122     gfc_source_form form;
 123   }
 124   exttype[] =
 125   {
 126     {
 127     ".f90", FORM_FREE}
 128     ,
 129     {
 130     ".f95", FORM_FREE}
 131     ,
 132     {
 133     ".f03", FORM_FREE}
 134     ,
 135     {
 136     ".f08", FORM_FREE}
 137     ,
 138     {
 139     ".f", FORM_FIXED}
 140     ,
 141     {
 142     ".for", FORM_FIXED}
 143     ,
 144     {
 145     ".ftn", FORM_FIXED}
 146     ,
 147     {
 148     "", FORM_UNKNOWN}
 149   };            /* sentinel value */
 150
 151   gfc_source_form f_form;
 152   const char *fileext;
 153   int i;
 154
 155   /* Find end of file name.  Note, filename is either a NULL pointer or
 156      a NUL terminated string.  */
 157   i = 0;
 158   while (filename[i] != '\0')
 159     i++;
 160
 161   /* Find last period.  */
 162   while (i >= 0 && (filename[i] != '.'))
 163     i--;
 164
 165   /* Did we see a file extension?  */
 166   if (i < 0)
 167     return FORM_UNKNOWN; /* Nope  */
 168
 169   /* Get file extension and compare it to others.  */
 170   fileext = &(filename[i]);
 171
 172   i = -1;
 173   f_form = FORM_UNKNOWN;
 174   do
 175     {
 176       i++;
 177       if (strcasecmp (fileext, exttype[i].extension) == 0)
 178         {
 179           f_form = exttype[i].form;
 180           break;
 181         }
 182     }
 183   while (exttype[i].form != FORM_UNKNOWN);
 184
 185   return f_form;
 186 }
 187
 188
 189 /* Finalize commandline options.  */
 190
 191 bool
 192 gfc_post_options (const char **pfilename)
 193 {
 194   const char *filename = *pfilename, *canon_source_file = NULL;
 195   char *source_path;
 196   int i;
 197
 198   /* Excess precision other than "fast" requires front-end
 199      support.  */
 200   if (flag_excess_precision_cmdline == EXCESS_PRECISION_STANDARD
 201       && TARGET_FLT_EVAL_METHOD_NON_DEFAULT)
 202     sorry ("-fexcess-precision=standard for Fortran");
 203   flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
 204
 205   /* Fortran allows associative math - but we cannot reassociate if
 206      we want traps or signed zeros. Cf. also flag_protect_parens.  */
 207   if (flag_associative_math == -1)
 208     flag_associative_math = (!flag_trapping_math && !flag_signed_zeros);
 209
 210   if (flag_protect_parens == -1)
 211     flag_protect_parens = !optimize_fast;
 212
 213   if (flag_stack_arrays == -1)
 214     flag_stack_arrays = optimize_fast;
 215
 216   /* By default, disable (re)allocation during assignment for -std=f95,
 217      and enable it for F2003/F2008/GNU/Legacy.  */
 218   if (flag_realloc_lhs == -1)
 219     {
 220       if (gfc_option.allow_std & GFC_STD_F2003)
 221         flag_realloc_lhs = 1;
 222       else
 223         flag_realloc_lhs = 0;
 224     }
 225
 226   /* -fbounds-check is equivalent to -fcheck=bounds */
 227   if (flag_bounds_check)
 228     gfc_option.rtcheck |= GFC_RTCHECK_BOUNDS;
 229
 230   if (flag_compare_debug)
 231     flag_dump_fortran_original = 0;
 232
 233   /* Make -fmax-errors visible to gfortran's diagnostic machinery.  */
 234   if (global_options_set.x_flag_max_errors)
 235     gfc_option.max_errors = flag_max_errors;
 236
 237   /* Verify the input file name.  */
 238   if (!filename || strcmp (filename, "-") == 0)
 239     {
 240       filename = "";
 241     }
 242
 243   if (gfc_option.flag_preprocessed)
 244     {
 245       /* For preprocessed files, if the first tokens are of the form # NUM.
 246          handle the directives so we know the original file name.  */
 247       gfc_source_file = gfc_read_orig_filename (filename, &canon_source_file);
 248       if (gfc_source_file == NULL)
 249         gfc_source_file = filename;
 250       else
 251         *pfilename = gfc_source_file;
 252     }
 253   else
 254     gfc_source_file = filename;
 255
 256   if (canon_source_file == NULL)
 257     canon_source_file = gfc_source_file;
 258
 259   /* Adds the path where the source file is to the list of include files.  */
 260
 261   i = strlen (canon_source_file);
 262   while (i > 0 && !IS_DIR_SEPARATOR (canon_source_file[i]))
 263     i--;
 264
 265   if (i != 0)
 266     {
 267       source_path = (char *) alloca (i + 1);
 268       memcpy (source_path, canon_source_file, i);
 269       source_path[i] = 0;
 270       gfc_add_include_path (source_path, true, true, true);
 271     }
 272   else
 273     gfc_add_include_path (".", true, true, true);
 274
 275   if (canon_source_file != gfc_source_file)
 276     free (CONST_CAST (char *, canon_source_file));
 277
 278   /* Decide which form the file will be read in as.  */
 279
 280   if (gfc_option.source_form != FORM_UNKNOWN)
 281     gfc_current_form = gfc_option.source_form;
 282   else
 283     {
 284       gfc_current_form = form_from_filename (filename);
 285
 286       if (gfc_current_form == FORM_UNKNOWN)
 287         {
 288           gfc_current_form = FORM_FREE;
 289           gfc_warning_now (0, "Reading file %qs as free form",
 290                            (filename[0] == '\0') ? "<stdin>" : filename);
 291         }
 292     }
 293
 294   /* If the user specified -fd-lines-as-{code|comments} verify that we're
 295      in fixed form.  */
 296   if (gfc_current_form == FORM_FREE)
 297     {
 298       if (gfc_option.flag_d_lines == 0)
 299         gfc_warning_now (0, "%<-fd-lines-as-comments%> has no effect "
 300                            "in free form");
 301       else if (gfc_option.flag_d_lines == 1)
 302         gfc_warning_now (0, "%<-fd-lines-as-code%> has no effect in free form");
 303
 304       if (warn_line_truncation == -1)
 305           warn_line_truncation = 1;
 306
 307       /* Enable -Werror=line-truncation when -Werror and -Wno-error have
 308          not been set.  */
 309       if (warn_line_truncation && !global_options_set.x_warnings_are_errors
 310           && (global_dc->classify_diagnostic[OPT_Wline_truncation] ==
 311               DK_UNSPECIFIED))
 312         diagnostic_classify_diagnostic (global_dc, OPT_Wline_truncation,
 313                                         DK_ERROR, UNKNOWN_LOCATION);
 314     }
 315   else if (warn_line_truncation == -1)
 316     warn_line_truncation = 0;
 317
 318   /* If -pedantic, warn about the use of GNU extensions.  */
 319   if (pedantic && (gfc_option.allow_std & GFC_STD_GNU) != 0)
 320     gfc_option.warn_std |= GFC_STD_GNU;
 321   /* -std=legacy -pedantic is effectively -std=gnu.  */
 322   if (pedantic && (gfc_option.allow_std & GFC_STD_LEGACY) != 0)
 323     gfc_option.warn_std |= GFC_STD_F95_OBS | GFC_STD_F95_DEL | GFC_STD_LEGACY;
 324
 325   /* If the user didn't explicitly specify -f(no)-second-underscore we
 326      use it if we're trying to be compatible with f2c, and not
 327      otherwise.  */
 328   if (flag_second_underscore == -1)
 329     flag_second_underscore = flag_f2c;
 330
 331   if (!flag_automatic && flag_max_stack_var_size != -2
 332       && flag_max_stack_var_size != 0)
 333     gfc_warning_now (0, "Flag %<-fno-automatic%> overwrites %<-fmax-stack-var-size=%d%>",
 334                      flag_max_stack_var_size);
 335   else if (!flag_automatic && flag_recursive)
 336     gfc_warning_now (0, "Flag %<-fno-automatic%> overwrites %<-frecursive%>");
 337   else if (!flag_automatic && flag_openmp)
 338     gfc_warning_now (0, "Flag %<-fno-automatic%> overwrites %<-frecursive%> implied by "
 339                      "%<-fopenmp%>");
 340   else if (flag_max_stack_var_size != -2 && flag_recursive)
 341     gfc_warning_now (0, "Flag %<-frecursive%> overwrites %<-fmax-stack-var-size=%d%>",
 342                      flag_max_stack_var_size);
 343   else if (flag_max_stack_var_size != -2 && flag_openmp)
 344     gfc_warning_now (0, "Flag %<-fmax-stack-var-size=%d%> overwrites %<-frecursive%> "
 345                      "implied by %<-fopenmp%>", flag_max_stack_var_size);
 346
 347   /* Implement -frecursive as -fmax-stack-var-size=-1.  */
 348   if (flag_recursive)
 349     flag_max_stack_var_size = -1;
 350
 351   /* Implied -frecursive; implemented as -fmax-stack-var-size=-1.  */
 352   if (flag_max_stack_var_size == -2 && flag_openmp && flag_automatic)
 353     {
 354       flag_recursive = 1;
 355       flag_max_stack_var_size = -1;
 356     }
 357
 358   /* Set default.  */
 359   if (flag_max_stack_var_size == -2)
 360     flag_max_stack_var_size = 32768;
 361
 362   /* Implement -fno-automatic as -fmax-stack-var-size=0.  */
 363   if (!flag_automatic)
 364     flag_max_stack_var_size = 0;
 365
 366   /* If we call BLAS directly, only inline up to the BLAS limit.  */
 367
 368   if (flag_external_blas && flag_inline_matmul_limit < 0)
 369     flag_inline_matmul_limit = flag_blas_matmul_limit;
 370
 371   /* Optimization implies front end optimization, unless the user
 372      specified it directly.  */
 373
 374   if (flag_frontend_optimize == -1)
 375     flag_frontend_optimize = optimize;
 376
 377   if (flag_max_array_constructor < 65535)
 378     flag_max_array_constructor = 65535;
 379
 380   if (flag_fixed_line_length != 0 && flag_fixed_line_length < 7)
 381     gfc_fatal_error ("Fixed line length must be at least seven");
 382
 383   if (flag_free_line_length != 0 && flag_free_line_length < 4)
 384     gfc_fatal_error ("Free line length must be at least three");
 385
 386   if (flag_max_subrecord_length > MAX_SUBRECORD_LENGTH)
 387     gfc_fatal_error ("Maximum subrecord length cannot exceed %d",
 388                      MAX_SUBRECORD_LENGTH);
 389
 390   gfc_cpp_post_options ();
 391
 392   if (gfc_option.allow_std & GFC_STD_F2008)
 393     lang_hooks.name = "GNU Fortran2008";
 394   else if (gfc_option.allow_std & GFC_STD_F2003)
 395     lang_hooks.name = "GNU Fortran2003";
 396
 397   return gfc_cpp_preprocess_only ();
 398 }
 399
 400
 401 static void
 402 gfc_handle_module_path_options (const char *arg)
 403 {
 404
 405   if (gfc_option.module_dir != NULL)
 406     gfc_fatal_error ("gfortran: Only one %<-J%> option allowed");
 407
 408   gfc_option.module_dir = XCNEWVEC (char, strlen (arg) + 2);
 409   strcpy (gfc_option.module_dir, arg);
 410
 411   gfc_add_include_path (gfc_option.module_dir, true, false, true);
 412
 413   strcat (gfc_option.module_dir, "/");
 414 }
 415
 416
 417 /* Handle options -ffpe-trap= and -ffpe-summary=.  */
 418
 419 static void
 420 gfc_handle_fpe_option (const char *arg, bool trap)
 421 {
 422   int result, pos = 0, n;
 423   /* precision is a backwards compatibility alias for inexact.  */
 424   static const char * const exception[] = { "invalid", "denormal", "zero",
 425                                             "overflow", "underflow",
 426                                             "inexact", "precision", NULL };
 427   static const int opt_exception[] = { GFC_FPE_INVALID, GFC_FPE_DENORMAL,
 428                                        GFC_FPE_ZERO, GFC_FPE_OVERFLOW,
 429                                        GFC_FPE_UNDERFLOW, GFC_FPE_INEXACT,
 430                                        GFC_FPE_INEXACT,
 431                                        0 };
 432
 433   /* As the default for -ffpe-summary= is nonzero, set it to 0.  */
 434   if (!trap)
 435     gfc_option.fpe_summary = 0;
 436
 437   while (*arg)
 438     {
 439       while (*arg == ',')
 440         arg++;
 441
 442       while (arg[pos] && arg[pos] != ',')
 443         pos++;
 444
 445       result = 0;
 446       if (!trap && strncmp ("none", arg, pos) == 0)
 447         {
 448           gfc_option.fpe_summary = 0;
 449           arg += pos;
 450           pos = 0;
 451           continue;
 452         }
 453       else if (!trap && strncmp ("all", arg, pos) == 0)
 454         {
 455           gfc_option.fpe_summary = GFC_FPE_INVALID | GFC_FPE_DENORMAL
 456                                    | GFC_FPE_ZERO | GFC_FPE_OVERFLOW
 457                                    | GFC_FPE_UNDERFLOW | GFC_FPE_INEXACT;
 458           arg += pos;
 459           pos = 0;
 460           continue;
 461         }
 462       else
 463         for (n = 0; exception[n] != NULL; n++)
 464           {
 465           if (exception[n] && strncmp (exception[n], arg, pos) == 0)
 466             {
 467               if (trap)
 468                 gfc_option.fpe |= opt_exception[n];
 469               else
 470                 gfc_option.fpe_summary |= opt_exception[n];
 471               arg += pos;
 472               pos = 0;
 473               result = 1;
 474               break;
 475             }
 476           }
 477       if (!result && !trap)
 478         gfc_fatal_error ("Argument to %<-ffpe-trap%> is not valid: %s", arg);
 479       else if (!result)
 480         gfc_fatal_error ("Argument to %<-ffpe-summary%> is not valid: %s", arg);
 481
 482     }
 483 }
 484
 485
 486 static void
 487 gfc_handle_runtime_check_option (const char *arg)
 488 {
 489   int result, pos = 0, n;
 490   static const char * const optname[] = { "all", "bounds", "array-temps",
 491                                           "recursion", "do", "pointer",
 492                                           "mem", NULL };
 493   static const int optmask[] = { GFC_RTCHECK_ALL, GFC_RTCHECK_BOUNDS,
 494                                  GFC_RTCHECK_ARRAY_TEMPS,
 495                                  GFC_RTCHECK_RECURSION, GFC_RTCHECK_DO,
 496                                  GFC_RTCHECK_POINTER, GFC_RTCHECK_MEM,
 497                                  0 };
 498
 499   while (*arg)
 500     {
 501       while (*arg == ',')
 502         arg++;
 503
 504       while (arg[pos] && arg[pos] != ',')
 505         pos++;
 506
 507       result = 0;
 508       for (n = 0; optname[n] != NULL; n++)
 509         {
 510           if (optname[n] && strncmp (optname[n], arg, pos) == 0)
 511             {
 512               gfc_option.rtcheck |= optmask[n];
 513               arg += pos;
 514               pos = 0;
 515               result = 1;
 516               break;
 517             }
 518         }
 519       if (!result)
 520         gfc_fatal_error ("Argument to %<-fcheck%> is not valid: %s", arg);
 521     }
 522 }
 523
 524
 525 /* Handle command-line options.  Returns 0 if unrecognized, 1 if
 526    recognized and handled.  */
 527
 528 bool
 529 gfc_handle_option (size_t scode, const char *arg, int value,
 530                    int kind ATTRIBUTE_UNUSED, location_t loc ATTRIBUTE_UNUSED,
 531                    const struct cl_option_handlers *handlers ATTRIBUTE_UNUSED)
 532 {
 533   bool result = true;
 534   enum opt_code code = (enum opt_code) scode;
 535
 536   if (gfc_cpp_handle_option (scode, arg, value) == 1)
 537     return true;
 538
 539   switch (code)
 540     {
 541     default:
 542       if (cl_options[code].flags & gfc_option_lang_mask ())
 543         break;
 544       result = false;
 545       break;
 546
 547     case OPT_fcheck_array_temporaries:
 548       gfc_option.rtcheck |= GFC_RTCHECK_ARRAY_TEMPS;
 549       break;
 550
 551     case OPT_fd_lines_as_code:
 552       gfc_option.flag_d_lines = 1;
 553       break;
 554
 555     case OPT_fd_lines_as_comments:
 556       gfc_option.flag_d_lines = 0;
 557       break;
 558
 559     case OPT_ffixed_form:
 560       gfc_option.source_form = FORM_FIXED;
 561       break;
 562
 563     case OPT_ffree_form:
 564       gfc_option.source_form = FORM_FREE;
 565       break;
 566
 567     case OPT_static_libgfortran:
 568 #ifndef HAVE_LD_STATIC_DYNAMIC
 569       gfc_fatal_error ("%<-static-libgfortran%> is not supported in this "
 570                        "configuration");
 571 #endif
 572       break;
 573
 574     case OPT_fintrinsic_modules_path:
 575     case OPT_fintrinsic_modules_path_:
 576
 577       /* This is needed because omp_lib.h is in a directory together
 578          with intrinsic modules.  Do no warn because during testing
 579          without an installed compiler, we would get lots of bogus
 580          warnings for a missing include directory.  */
 581       gfc_add_include_path (arg, false, false, false);
 582
 583       gfc_add_intrinsic_modules_path (arg);
 584       break;
 585
 586     case OPT_fpreprocessed:
 587       gfc_option.flag_preprocessed = value;
 588       break;
 589
 590     case OPT_fmax_identifier_length_:
 591       if (value > GFC_MAX_SYMBOL_LEN)
 592         gfc_fatal_error ("Maximum supported identifier length is %d",
 593                          GFC_MAX_SYMBOL_LEN);
 594       gfc_option.max_identifier_length = value;
 595       break;
 596
 597     case OPT_finit_local_zero:
 598       gfc_option.flag_init_integer = GFC_INIT_INTEGER_ON;
 599       gfc_option.flag_init_integer_value = 0;
 600       flag_init_real = GFC_INIT_REAL_ZERO;
 601       gfc_option.flag_init_logical = GFC_INIT_LOGICAL_FALSE;
 602       gfc_option.flag_init_character = GFC_INIT_CHARACTER_ON;
 603       gfc_option.flag_init_character_value = (char)0;
 604       break;
 605
 606     case OPT_finit_logical_:
 607       if (!strcasecmp (arg, "false"))
 608         gfc_option.flag_init_logical = GFC_INIT_LOGICAL_FALSE;
 609       else if (!strcasecmp (arg, "true"))
 610         gfc_option.flag_init_logical = GFC_INIT_LOGICAL_TRUE;
 611       else
 612         gfc_fatal_error ("Unrecognized option to %<-finit-logical%>: %s",
 613                          arg);
 614       break;
 615
 616     case OPT_finit_integer_:
 617       gfc_option.flag_init_integer = GFC_INIT_INTEGER_ON;
 618       gfc_option.flag_init_integer_value = atoi (arg);
 619       break;
 620
 621     case OPT_finit_character_:
 622       if (value >= 0 && value <= 127)
 623         {
 624           gfc_option.flag_init_character = GFC_INIT_CHARACTER_ON;
 625           gfc_option.flag_init_character_value = (char)value;
 626         }
 627       else
 628         gfc_fatal_error ("The value of n in %<-finit-character=n%> must be "
 629                          "between 0 and 127");
 630       break;
 631
 632     case OPT_I:
 633       gfc_add_include_path (arg, true, false, true);
 634       break;
 635
 636     case OPT_J:
 637       gfc_handle_module_path_options (arg);
 638       break;
 639
 640     case OPT_ffpe_trap_:
 641       gfc_handle_fpe_option (arg, true);
 642       break;
 643
 644     case OPT_ffpe_summary_:
 645       gfc_handle_fpe_option (arg, false);
 646       break;
 647
 648     case OPT_std_f95:
 649       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F95 | GFC_STD_F77
 650                              | GFC_STD_F2008_OBS;
 651       gfc_option.warn_std = GFC_STD_F95_OBS;
 652       gfc_option.max_continue_fixed = 19;
 653       gfc_option.max_continue_free = 39;
 654       gfc_option.max_identifier_length = 31;
 655       warn_ampersand = 1;
 656       warn_tabs = 1;
 657       break;
 658
 659     case OPT_std_f2003:
 660       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F77
 661         | GFC_STD_F2003 | GFC_STD_F95 | GFC_STD_F2008_OBS;
 662       gfc_option.warn_std = GFC_STD_F95_OBS;
 663       gfc_option.max_identifier_length = 63;
 664       warn_ampersand = 1;
 665       warn_tabs = 1;
 666       break;
 667
 668     case OPT_std_f2008:
 669       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F77
 670         | GFC_STD_F2003 | GFC_STD_F95 | GFC_STD_F2008 | GFC_STD_F2008_OBS;
 671       gfc_option.warn_std = GFC_STD_F95_OBS | GFC_STD_F2008_OBS;
 672       gfc_option.max_identifier_length = 63;
 673       warn_ampersand = 1;
 674       warn_tabs = 1;
 675       break;
 676
 677     case OPT_std_f2008ts:
 678       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F77
 679         | GFC_STD_F2003 | GFC_STD_F95 | GFC_STD_F2008 | GFC_STD_F2008_OBS
 680         | GFC_STD_F2008_TS;
 681       gfc_option.warn_std = GFC_STD_F95_OBS | GFC_STD_F2008_OBS;
 682       gfc_option.max_identifier_length = 63;
 683       warn_ampersand = 1;
 684       warn_tabs = 1;
 685       break;
 686
 687     case OPT_std_gnu:
 688       set_default_std_flags ();
 689       break;
 690
 691     case OPT_std_legacy:
 692       set_default_std_flags ();
 693       gfc_option.warn_std = 0;
 694       break;
 695
 696     case OPT_fshort_enums:
 697       /* Handled in language-independent code.  */
 698       break;
 699
 700     case OPT_fcheck_:
 701       gfc_handle_runtime_check_option (arg);
 702       break;
 703     }
 704
 705   Fortran_handle_option_auto (&global_options, &global_options_set,
 706                               scode, arg, value,
 707                               gfc_option_lang_mask (), kind,
 708                               loc, handlers, global_dc);
 709   return result;
 710 }
 711
 712
 713 /* Return a string with the options passed to the compiler; used for
 714    Fortran's compiler_options() intrinsic.  */
 715
 716 char *
 717 gfc_get_option_string (void)
 718 {
 719   unsigned j;
 720   size_t len, pos;
 721   char *result;
 722
 723   /* Allocate and return a one-character string with '\0'.  */
 724   if (!save_decoded_options_count)
 725     return XCNEWVEC (char, 1);
 726
 727   /* Determine required string length.  */
 728
 729   len = 0;
 730   for (j = 1; j < save_decoded_options_count; j++)
 731     {
 732       switch (save_decoded_options[j].opt_index)
 733         {
 734         case OPT_o:
 735         case OPT_d:
 736         case OPT_dumpbase:
 737         case OPT_dumpdir:
 738         case OPT_auxbase:
 739         case OPT_quiet:
 740         case OPT_version:
 741         case OPT_fintrinsic_modules_path:
 742         case OPT_fintrinsic_modules_path_:
 743           /* Ignore these.  */
 744           break;
 745         default:
 746           /* Ignore file names.  */
 747           if (save_decoded_options[j].orig_option_with_args_text[0] == '-')
 748             len += 1
 749                  + strlen (save_decoded_options[j].orig_option_with_args_text);
 750         }
 751     }
 752
 753   result = XCNEWVEC (char, len);
 754
 755   pos = 0;
 756   for (j = 1; j < save_decoded_options_count; j++)
 757     {
 758       switch (save_decoded_options[j].opt_index)
 759         {
 760         case OPT_o:
 761         case OPT_d:
 762         case OPT_dumpbase:
 763         case OPT_dumpdir:
 764         case OPT_auxbase:
 765         case OPT_quiet:
 766         case OPT_version:
 767         case OPT_fintrinsic_modules_path:
 768         case OPT_fintrinsic_modules_path_:
 769           /* Ignore these.  */
 770           continue;
 771
 772         case OPT_cpp_:
 773           /* Use "-cpp" rather than "-cpp=<temporary file>".  */
 774           len = 4;
 775           break;
 776
 777         default:
 778           /* Ignore file names.  */
 779           if (save_decoded_options[j].orig_option_with_args_text[0] != '-')
 780             continue;
 781
 782           len = strlen (save_decoded_options[j].orig_option_with_args_text);
 783         }
 784
 785       memcpy (&result[pos], save_decoded_options[j].orig_option_with_args_text, len);
 786       pos += len;
 787       result[pos++] = ' ';
 788     }
 789
 790   result[--pos] = '\0';
 791   return result;
 792 }