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 "hash-set.h"
  25 #include "machmode.h"
  26 #include "vec.h"
  27 #include "double-int.h"
  28 #include "input.h"
  29 #include "alias.h"
  30 #include "symtab.h"
  31 #include "options.h"
  32 #include "wide-int.h"
  33 #include "inchash.h"
  34 #include "tree.h"
  35 #include "flags.h"
  36 #include "intl.h"
  37 #include "opts.h"
  38 #include "toplev.h"  /* For save_decoded_options.  */
  39 #include "params.h"
  40 #include "tree-inline.h"
  41 #include "gfortran.h"
  42 #include "target.h"
  43 #include "cpp.h"
  44 #include "diagnostic.h" /* For global_dc.  */
  45 #include "tm.h"
  46 #include "langhooks.h"
  47
  48 gfc_option_t gfc_option;
  49
  50
  51 /* Set flags that control warnings and errors for different
  52    Fortran standards to their default values.  Keep in sync with
  53    libgfortran/runtime/compile_options.c (init_compile_options).  */
  54
  55 static void
  56 set_default_std_flags (void)
  57 {
  58   gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL
  59     | GFC_STD_F2003 | GFC_STD_F2008 | GFC_STD_F95 | GFC_STD_F77
  60     | GFC_STD_F2008_OBS | GFC_STD_F2008_TS | GFC_STD_GNU | GFC_STD_LEGACY;
  61   gfc_option.warn_std = GFC_STD_F95_DEL | GFC_STD_LEGACY;
  62 }
  63
  64
  65 /* Return language mask for Fortran options.  */
  66
  67 unsigned int
  68 gfc_option_lang_mask (void)
  69 {
  70   return CL_Fortran;
  71 }
  72
  73 /* Initialize options structure OPTS.  */
  74
  75 void
  76 gfc_init_options_struct (struct gcc_options *opts)
  77 {
  78   opts->x_flag_errno_math = 0;
  79   opts->frontend_set_flag_errno_math = true;
  80   opts->x_flag_associative_math = -1;
  81   opts->frontend_set_flag_associative_math = true;
  82 }
  83
  84 /* Get ready for options handling. Keep in sync with
  85    libgfortran/runtime/compile_options.c (init_compile_options).  */
  86
  87 void
  88 gfc_init_options (unsigned int decoded_options_count,
  89                   struct cl_decoded_option *decoded_options)
  90 {
  91   gfc_source_file = NULL;
  92   gfc_option.module_dir = NULL;
  93   gfc_option.source_form = FORM_UNKNOWN;
  94   gfc_option.max_continue_fixed = 255;
  95   gfc_option.max_continue_free = 255;
  96   gfc_option.max_identifier_length = GFC_MAX_SYMBOL_LEN;
  97   gfc_option.max_errors = 25;
  98
  99   gfc_option.flag_preprocessed = 0;
 100   gfc_option.flag_d_lines = -1;
 101   gfc_option.flag_init_integer = GFC_INIT_INTEGER_OFF;
 102   gfc_option.flag_init_integer_value = 0;
 103   gfc_option.flag_init_logical = GFC_INIT_LOGICAL_OFF;
 104   gfc_option.flag_init_character = GFC_INIT_CHARACTER_OFF;
 105   gfc_option.flag_init_character_value = (char)0;
 106
 107   gfc_option.fpe = 0;
 108   /* All except GFC_FPE_INEXACT.  */
 109   gfc_option.fpe_summary = GFC_FPE_INVALID | GFC_FPE_DENORMAL
 110                            | GFC_FPE_ZERO | GFC_FPE_OVERFLOW
 111                            | GFC_FPE_UNDERFLOW;
 112   gfc_option.rtcheck = 0;
 113
 114   /* ??? Wmissing-include-dirs is disabled by default in C/C++ but
 115      enabled by default in Fortran.  Ideally, we should express this
 116      in .opt, but that is not supported yet.  */
 117   if (!global_options_set.x_cpp_warn_missing_include_dirs)
 118     global_options.x_cpp_warn_missing_include_dirs = 1;;
 119
 120   set_default_std_flags ();
 121
 122   /* Initialize cpp-related options.  */
 123   gfc_cpp_init_options (decoded_options_count, decoded_options);
 124   gfc_diagnostics_init ();
 125 }
 126
 127
 128 /* Determine the source form from the filename extension.  We assume
 129    case insensitivity.  */
 130
 131 static gfc_source_form
 132 form_from_filename (const char *filename)
 133 {
 134   static const struct
 135   {
 136     const char *extension;
 137     gfc_source_form form;
 138   }
 139   exttype[] =
 140   {
 141     {
 142     ".f90", FORM_FREE}
 143     ,
 144     {
 145     ".f95", FORM_FREE}
 146     ,
 147     {
 148     ".f03", FORM_FREE}
 149     ,
 150     {
 151     ".f08", FORM_FREE}
 152     ,
 153     {
 154     ".f", FORM_FIXED}
 155     ,
 156     {
 157     ".for", FORM_FIXED}
 158     ,
 159     {
 160     ".ftn", FORM_FIXED}
 161     ,
 162     {
 163     "", FORM_UNKNOWN}
 164   };            /* sentinel value */
 165
 166   gfc_source_form f_form;
 167   const char *fileext;
 168   int i;
 169
 170   /* Find end of file name.  Note, filename is either a NULL pointer or
 171      a NUL terminated string.  */
 172   i = 0;
 173   while (filename[i] != '\0')
 174     i++;
 175
 176   /* Find last period.  */
 177   while (i >= 0 && (filename[i] != '.'))
 178     i--;
 179
 180   /* Did we see a file extension?  */
 181   if (i < 0)
 182     return FORM_UNKNOWN; /* Nope  */
 183
 184   /* Get file extension and compare it to others.  */
 185   fileext = &(filename[i]);
 186
 187   i = -1;
 188   f_form = FORM_UNKNOWN;
 189   do
 190     {
 191       i++;
 192       if (strcasecmp (fileext, exttype[i].extension) == 0)
 193         {
 194           f_form = exttype[i].form;
 195           break;
 196         }
 197     }
 198   while (exttype[i].form != FORM_UNKNOWN);
 199
 200   return f_form;
 201 }
 202
 203
 204 /* Finalize commandline options.  */
 205
 206 bool
 207 gfc_post_options (const char **pfilename)
 208 {
 209   const char *filename = *pfilename, *canon_source_file = NULL;
 210   char *source_path;
 211   int i;
 212
 213   /* Excess precision other than "fast" requires front-end
 214      support.  */
 215   if (flag_excess_precision_cmdline == EXCESS_PRECISION_STANDARD
 216       && TARGET_FLT_EVAL_METHOD_NON_DEFAULT)
 217     sorry ("-fexcess-precision=standard for Fortran");
 218   flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
 219
 220   /* Fortran allows associative math - but we cannot reassociate if
 221      we want traps or signed zeros. Cf. also flag_protect_parens.  */
 222   if (flag_associative_math == -1)
 223     flag_associative_math = (!flag_trapping_math && !flag_signed_zeros);
 224
 225   if (flag_protect_parens == -1)
 226     flag_protect_parens = !optimize_fast;
 227
 228   if (flag_stack_arrays == -1)
 229     flag_stack_arrays = optimize_fast;
 230
 231   /* By default, disable (re)allocation during assignment for -std=f95,
 232      and enable it for F2003/F2008/GNU/Legacy.  */
 233   if (flag_realloc_lhs == -1)
 234     {
 235       if (gfc_option.allow_std & GFC_STD_F2003)
 236         flag_realloc_lhs = 1;
 237       else
 238         flag_realloc_lhs = 0;
 239     }
 240
 241   /* -fbounds-check is equivalent to -fcheck=bounds */
 242   if (flag_bounds_check)
 243     gfc_option.rtcheck |= GFC_RTCHECK_BOUNDS;
 244
 245   if (flag_compare_debug)
 246     flag_dump_fortran_original = 0;
 247
 248   /* Make -fmax-errors visible to gfortran's diagnostic machinery.  */
 249   if (global_options_set.x_flag_max_errors)
 250     gfc_option.max_errors = flag_max_errors;
 251
 252   /* Verify the input file name.  */
 253   if (!filename || strcmp (filename, "-") == 0)
 254     {
 255       filename = "";
 256     }
 257
 258   if (gfc_option.flag_preprocessed)
 259     {
 260       /* For preprocessed files, if the first tokens are of the form # NUM.
 261          handle the directives so we know the original file name.  */
 262       gfc_source_file = gfc_read_orig_filename (filename, &canon_source_file);
 263       if (gfc_source_file == NULL)
 264         gfc_source_file = filename;
 265       else
 266         *pfilename = gfc_source_file;
 267     }
 268   else
 269     gfc_source_file = filename;
 270
 271   if (canon_source_file == NULL)
 272     canon_source_file = gfc_source_file;
 273
 274   /* Adds the path where the source file is to the list of include files.  */
 275
 276   i = strlen (canon_source_file);
 277   while (i > 0 && !IS_DIR_SEPARATOR (canon_source_file[i]))
 278     i--;
 279
 280   if (i != 0)
 281     {
 282       source_path = (char *) alloca (i + 1);
 283       memcpy (source_path, canon_source_file, i);
 284       source_path[i] = 0;
 285       gfc_add_include_path (source_path, true, true, true);
 286     }
 287   else
 288     gfc_add_include_path (".", true, true, true);
 289
 290   if (canon_source_file != gfc_source_file)
 291     free (CONST_CAST (char *, canon_source_file));
 292
 293   /* Decide which form the file will be read in as.  */
 294
 295   if (gfc_option.source_form != FORM_UNKNOWN)
 296     gfc_current_form = gfc_option.source_form;
 297   else
 298     {
 299       gfc_current_form = form_from_filename (filename);
 300
 301       if (gfc_current_form == FORM_UNKNOWN)
 302         {
 303           gfc_current_form = FORM_FREE;
 304           gfc_warning_now (0, "Reading file %qs as free form",
 305                            (filename[0] == '\0') ? "<stdin>" : filename);
 306         }
 307     }
 308
 309   /* If the user specified -fd-lines-as-{code|comments} verify that we're
 310      in fixed form.  */
 311   if (gfc_current_form == FORM_FREE)
 312     {
 313       if (gfc_option.flag_d_lines == 0)
 314         gfc_warning_now (0, "%<-fd-lines-as-comments%> has no effect "
 315                            "in free form");
 316       else if (gfc_option.flag_d_lines == 1)
 317         gfc_warning_now (0, "%<-fd-lines-as-code%> has no effect in free form");
 318
 319       if (warn_line_truncation == -1)
 320           warn_line_truncation = 1;
 321
 322       /* Enable -Werror=line-truncation when -Werror and -Wno-error have
 323          not been set.  */
 324       if (warn_line_truncation && !global_options_set.x_warnings_are_errors
 325           && (global_dc->classify_diagnostic[OPT_Wline_truncation] ==
 326               DK_UNSPECIFIED))
 327         diagnostic_classify_diagnostic (global_dc, OPT_Wline_truncation,
 328                                         DK_ERROR, UNKNOWN_LOCATION);
 329     }
 330   else if (warn_line_truncation == -1)
 331     warn_line_truncation = 0;
 332
 333   /* If -pedantic, warn about the use of GNU extensions.  */
 334   if (pedantic && (gfc_option.allow_std & GFC_STD_GNU) != 0)
 335     gfc_option.warn_std |= GFC_STD_GNU;
 336   /* -std=legacy -pedantic is effectively -std=gnu.  */
 337   if (pedantic && (gfc_option.allow_std & GFC_STD_LEGACY) != 0)
 338     gfc_option.warn_std |= GFC_STD_F95_OBS | GFC_STD_F95_DEL | GFC_STD_LEGACY;
 339
 340   /* If the user didn't explicitly specify -f(no)-second-underscore we
 341      use it if we're trying to be compatible with f2c, and not
 342      otherwise.  */
 343   if (flag_second_underscore == -1)
 344     flag_second_underscore = flag_f2c;
 345
 346   if (!flag_automatic && flag_max_stack_var_size != -2
 347       && flag_max_stack_var_size != 0)
 348     gfc_warning_now (0, "Flag %<-fno-automatic%> overwrites %<-fmax-stack-var-size=%d%>",
 349                      flag_max_stack_var_size);
 350   else if (!flag_automatic && flag_recursive)
 351     gfc_warning_now (0, "Flag %<-fno-automatic%> overwrites %<-frecursive%>");
 352   else if (!flag_automatic && flag_openmp)
 353     gfc_warning_now (0, "Flag %<-fno-automatic%> overwrites %<-frecursive%> implied by "
 354                      "%<-fopenmp%>");
 355   else if (flag_max_stack_var_size != -2 && flag_recursive)
 356     gfc_warning_now (0, "Flag %<-frecursive%> overwrites %<-fmax-stack-var-size=%d%>",
 357                      flag_max_stack_var_size);
 358   else if (flag_max_stack_var_size != -2 && flag_openmp)
 359     gfc_warning_now (0, "Flag %<-fmax-stack-var-size=%d%> overwrites %<-frecursive%> "
 360                      "implied by %<-fopenmp%>", flag_max_stack_var_size);
 361
 362   /* Implement -frecursive as -fmax-stack-var-size=-1.  */
 363   if (flag_recursive)
 364     flag_max_stack_var_size = -1;
 365
 366   /* Implied -frecursive; implemented as -fmax-stack-var-size=-1.  */
 367   if (flag_max_stack_var_size == -2 && flag_openmp && flag_automatic)
 368     {
 369       flag_recursive = 1;
 370       flag_max_stack_var_size = -1;
 371     }
 372
 373   /* Set default.  */
 374   if (flag_max_stack_var_size == -2)
 375     flag_max_stack_var_size = 32768;
 376
 377   /* Implement -fno-automatic as -fmax-stack-var-size=0.  */
 378   if (!flag_automatic)
 379     flag_max_stack_var_size = 0;
 380
 381   /* Optimization implies front end optimization, unless the user
 382      specified it directly.  */
 383
 384   if (flag_frontend_optimize == -1)
 385     flag_frontend_optimize = optimize;
 386
 387   if (flag_max_array_constructor < 65535)
 388     flag_max_array_constructor = 65535;
 389
 390   if (flag_fixed_line_length != 0 && flag_fixed_line_length < 7)
 391     gfc_fatal_error ("Fixed line length must be at least seven");
 392
 393   if (flag_free_line_length != 0 && flag_free_line_length < 4)
 394     gfc_fatal_error ("Free line length must be at least three");
 395
 396   if (flag_max_subrecord_length > MAX_SUBRECORD_LENGTH)
 397     gfc_fatal_error ("Maximum subrecord length cannot exceed %d",
 398                      MAX_SUBRECORD_LENGTH);
 399
 400   gfc_cpp_post_options ();
 401
 402   if (gfc_option.allow_std & GFC_STD_F2008)
 403     lang_hooks.name = "GNU Fortran2008";
 404   else if (gfc_option.allow_std & GFC_STD_F2003)
 405     lang_hooks.name = "GNU Fortran2003";
 406
 407   return gfc_cpp_preprocess_only ();
 408 }
 409
 410
 411 static void
 412 gfc_handle_module_path_options (const char *arg)
 413 {
 414
 415   if (gfc_option.module_dir != NULL)
 416     gfc_fatal_error ("gfortran: Only one %<-J%> option allowed");
 417
 418   gfc_option.module_dir = XCNEWVEC (char, strlen (arg) + 2);
 419   strcpy (gfc_option.module_dir, arg);
 420
 421   gfc_add_include_path (gfc_option.module_dir, true, false, true);
 422
 423   strcat (gfc_option.module_dir, "/");
 424 }
 425
 426
 427 /* Handle options -ffpe-trap= and -ffpe-summary=.  */
 428
 429 static void
 430 gfc_handle_fpe_option (const char *arg, bool trap)
 431 {
 432   int result, pos = 0, n;
 433   /* precision is a backwards compatibility alias for inexact.  */
 434   static const char * const exception[] = { "invalid", "denormal", "zero",
 435                                             "overflow", "underflow",
 436                                             "inexact", "precision", NULL };
 437   static const int opt_exception[] = { GFC_FPE_INVALID, GFC_FPE_DENORMAL,
 438                                        GFC_FPE_ZERO, GFC_FPE_OVERFLOW,
 439                                        GFC_FPE_UNDERFLOW, GFC_FPE_INEXACT,
 440                                        GFC_FPE_INEXACT,
 441                                        0 };
 442
 443   /* As the default for -ffpe-summary= is nonzero, set it to 0.  */
 444   if (!trap)
 445     gfc_option.fpe_summary = 0;
 446
 447   while (*arg)
 448     {
 449       while (*arg == ',')
 450         arg++;
 451
 452       while (arg[pos] && arg[pos] != ',')
 453         pos++;
 454
 455       result = 0;
 456       if (!trap && strncmp ("none", arg, pos) == 0)
 457         {
 458           gfc_option.fpe_summary = 0;
 459           arg += pos;
 460           pos = 0;
 461           continue;
 462         }
 463       else if (!trap && strncmp ("all", arg, pos) == 0)
 464         {
 465           gfc_option.fpe_summary = GFC_FPE_INVALID | GFC_FPE_DENORMAL
 466                                    | GFC_FPE_ZERO | GFC_FPE_OVERFLOW
 467                                    | GFC_FPE_UNDERFLOW | GFC_FPE_INEXACT;
 468           arg += pos;
 469           pos = 0;
 470           continue;
 471         }
 472       else
 473         for (n = 0; exception[n] != NULL; n++)
 474           {
 475           if (exception[n] && strncmp (exception[n], arg, pos) == 0)
 476             {
 477               if (trap)
 478                 gfc_option.fpe |= opt_exception[n];
 479               else
 480                 gfc_option.fpe_summary |= opt_exception[n];
 481               arg += pos;
 482               pos = 0;
 483               result = 1;
 484               break;
 485             }
 486           }
 487       if (!result && !trap)
 488         gfc_fatal_error ("Argument to %<-ffpe-trap%> is not valid: %s", arg);
 489       else if (!result)
 490         gfc_fatal_error ("Argument to %<-ffpe-summary%> is not valid: %s", arg);
 491
 492     }
 493 }
 494
 495
 496 static void
 497 gfc_handle_runtime_check_option (const char *arg)
 498 {
 499   int result, pos = 0, n;
 500   static const char * const optname[] = { "all", "bounds", "array-temps",
 501                                           "recursion", "do", "pointer",
 502                                           "mem", NULL };
 503   static const int optmask[] = { GFC_RTCHECK_ALL, GFC_RTCHECK_BOUNDS,
 504                                  GFC_RTCHECK_ARRAY_TEMPS,
 505                                  GFC_RTCHECK_RECURSION, GFC_RTCHECK_DO,
 506                                  GFC_RTCHECK_POINTER, GFC_RTCHECK_MEM,
 507                                  0 };
 508
 509   while (*arg)
 510     {
 511       while (*arg == ',')
 512         arg++;
 513
 514       while (arg[pos] && arg[pos] != ',')
 515         pos++;
 516
 517       result = 0;
 518       for (n = 0; optname[n] != NULL; n++)
 519         {
 520           if (optname[n] && strncmp (optname[n], arg, pos) == 0)
 521             {
 522               gfc_option.rtcheck |= optmask[n];
 523               arg += pos;
 524               pos = 0;
 525               result = 1;
 526               break;
 527             }
 528         }
 529       if (!result)
 530         gfc_fatal_error ("Argument to %<-fcheck%> is not valid: %s", arg);
 531     }
 532 }
 533
 534
 535 /* Handle command-line options.  Returns 0 if unrecognized, 1 if
 536    recognized and handled.  */
 537
 538 bool
 539 gfc_handle_option (size_t scode, const char *arg, int value,
 540                    int kind ATTRIBUTE_UNUSED, location_t loc ATTRIBUTE_UNUSED,
 541                    const struct cl_option_handlers *handlers ATTRIBUTE_UNUSED)
 542 {
 543   bool result = true;
 544   enum opt_code code = (enum opt_code) scode;
 545
 546   if (gfc_cpp_handle_option (scode, arg, value) == 1)
 547     return true;
 548
 549   switch (code)
 550     {
 551     default:
 552       if (cl_options[code].flags & gfc_option_lang_mask ())
 553         break;
 554       result = false;
 555       break;
 556
 557     case OPT_fcheck_array_temporaries:
 558       gfc_option.rtcheck |= GFC_RTCHECK_ARRAY_TEMPS;
 559       break;
 560
 561     case OPT_fd_lines_as_code:
 562       gfc_option.flag_d_lines = 1;
 563       break;
 564
 565     case OPT_fd_lines_as_comments:
 566       gfc_option.flag_d_lines = 0;
 567       break;
 568
 569     case OPT_ffixed_form:
 570       gfc_option.source_form = FORM_FIXED;
 571       break;
 572
 573     case OPT_ffree_form:
 574       gfc_option.source_form = FORM_FREE;
 575       break;
 576
 577     case OPT_static_libgfortran:
 578 #ifndef HAVE_LD_STATIC_DYNAMIC
 579       gfc_fatal_error ("%<-static-libgfortran%> is not supported in this "
 580                        "configuration");
 581 #endif
 582       break;
 583
 584     case OPT_fintrinsic_modules_path:
 585     case OPT_fintrinsic_modules_path_:
 586
 587       /* This is needed because omp_lib.h is in a directory together
 588          with intrinsic modules.  Do no warn because during testing
 589          without an installed compiler, we would get lots of bogus
 590          warnings for a missing include directory.  */
 591       gfc_add_include_path (arg, false, false, false);
 592
 593       gfc_add_intrinsic_modules_path (arg);
 594       break;
 595
 596     case OPT_fpreprocessed:
 597       gfc_option.flag_preprocessed = value;
 598       break;
 599
 600     case OPT_fmax_identifier_length_:
 601       if (value > GFC_MAX_SYMBOL_LEN)
 602         gfc_fatal_error ("Maximum supported identifier length is %d",
 603                          GFC_MAX_SYMBOL_LEN);
 604       gfc_option.max_identifier_length = value;
 605       break;
 606
 607     case OPT_finit_local_zero:
 608       gfc_option.flag_init_integer = GFC_INIT_INTEGER_ON;
 609       gfc_option.flag_init_integer_value = 0;
 610       flag_init_real = GFC_INIT_REAL_ZERO;
 611       gfc_option.flag_init_logical = GFC_INIT_LOGICAL_FALSE;
 612       gfc_option.flag_init_character = GFC_INIT_CHARACTER_ON;
 613       gfc_option.flag_init_character_value = (char)0;
 614       break;
 615
 616     case OPT_finit_logical_:
 617       if (!strcasecmp (arg, "false"))
 618         gfc_option.flag_init_logical = GFC_INIT_LOGICAL_FALSE;
 619       else if (!strcasecmp (arg, "true"))
 620         gfc_option.flag_init_logical = GFC_INIT_LOGICAL_TRUE;
 621       else
 622         gfc_fatal_error ("Unrecognized option to %<-finit-logical%>: %s",
 623                          arg);
 624       break;
 625
 626     case OPT_finit_integer_:
 627       gfc_option.flag_init_integer = GFC_INIT_INTEGER_ON;
 628       gfc_option.flag_init_integer_value = atoi (arg);
 629       break;
 630
 631     case OPT_finit_character_:
 632       if (value >= 0 && value <= 127)
 633         {
 634           gfc_option.flag_init_character = GFC_INIT_CHARACTER_ON;
 635           gfc_option.flag_init_character_value = (char)value;
 636         }
 637       else
 638         gfc_fatal_error ("The value of n in %<-finit-character=n%> must be "
 639                          "between 0 and 127");
 640       break;
 641
 642     case OPT_I:
 643       gfc_add_include_path (arg, true, false, true);
 644       break;
 645
 646     case OPT_J:
 647       gfc_handle_module_path_options (arg);
 648       break;
 649
 650     case OPT_ffpe_trap_:
 651       gfc_handle_fpe_option (arg, true);
 652       break;
 653
 654     case OPT_ffpe_summary_:
 655       gfc_handle_fpe_option (arg, false);
 656       break;
 657
 658     case OPT_std_f95:
 659       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F95 | GFC_STD_F77
 660                              | GFC_STD_F2008_OBS;
 661       gfc_option.warn_std = GFC_STD_F95_OBS;
 662       gfc_option.max_continue_fixed = 19;
 663       gfc_option.max_continue_free = 39;
 664       gfc_option.max_identifier_length = 31;
 665       warn_ampersand = 1;
 666       warn_tabs = 1;
 667       break;
 668
 669     case OPT_std_f2003:
 670       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F77
 671         | GFC_STD_F2003 | GFC_STD_F95 | GFC_STD_F2008_OBS;
 672       gfc_option.warn_std = GFC_STD_F95_OBS;
 673       gfc_option.max_identifier_length = 63;
 674       warn_ampersand = 1;
 675       warn_tabs = 1;
 676       break;
 677
 678     case OPT_std_f2008:
 679       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F77
 680         | GFC_STD_F2003 | GFC_STD_F95 | GFC_STD_F2008 | GFC_STD_F2008_OBS;
 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_f2008ts:
 688       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F77
 689         | GFC_STD_F2003 | GFC_STD_F95 | GFC_STD_F2008 | GFC_STD_F2008_OBS
 690         | GFC_STD_F2008_TS;
 691       gfc_option.warn_std = GFC_STD_F95_OBS | GFC_STD_F2008_OBS;
 692       gfc_option.max_identifier_length = 63;
 693       warn_ampersand = 1;
 694       warn_tabs = 1;
 695       break;
 696
 697     case OPT_std_gnu:
 698       set_default_std_flags ();
 699       break;
 700
 701     case OPT_std_legacy:
 702       set_default_std_flags ();
 703       gfc_option.warn_std = 0;
 704       break;
 705
 706     case OPT_fshort_enums:
 707       /* Handled in language-independent code.  */
 708       break;
 709
 710     case OPT_fcheck_:
 711       gfc_handle_runtime_check_option (arg);
 712       break;
 713     }
 714
 715   Fortran_handle_option_auto (&global_options, &global_options_set,
 716                               scode, arg, value,
 717                               gfc_option_lang_mask (), kind,
 718                               loc, handlers, global_dc);
 719   return result;
 720 }
 721
 722
 723 /* Return a string with the options passed to the compiler; used for
 724    Fortran's compiler_options() intrinsic.  */
 725
 726 char *
 727 gfc_get_option_string (void)
 728 {
 729   unsigned j;
 730   size_t len, pos;
 731   char *result;
 732
 733   /* Allocate and return a one-character string with '\0'.  */
 734   if (!save_decoded_options_count)
 735     return XCNEWVEC (char, 1);
 736
 737   /* Determine required string length.  */
 738
 739   len = 0;
 740   for (j = 1; j < save_decoded_options_count; j++)
 741     {
 742       switch (save_decoded_options[j].opt_index)
 743         {
 744         case OPT_o:
 745         case OPT_d:
 746         case OPT_dumpbase:
 747         case OPT_dumpdir:
 748         case OPT_auxbase:
 749         case OPT_quiet:
 750         case OPT_version:
 751         case OPT_fintrinsic_modules_path:
 752         case OPT_fintrinsic_modules_path_:
 753           /* Ignore these.  */
 754           break;
 755         default:
 756           /* Ignore file names.  */
 757           if (save_decoded_options[j].orig_option_with_args_text[0] == '-')
 758             len += 1
 759                  + strlen (save_decoded_options[j].orig_option_with_args_text);
 760         }
 761     }
 762
 763   result = XCNEWVEC (char, len);
 764
 765   pos = 0;
 766   for (j = 1; j < save_decoded_options_count; j++)
 767     {
 768       switch (save_decoded_options[j].opt_index)
 769         {
 770         case OPT_o:
 771         case OPT_d:
 772         case OPT_dumpbase:
 773         case OPT_dumpdir:
 774         case OPT_auxbase:
 775         case OPT_quiet:
 776         case OPT_version:
 777         case OPT_fintrinsic_modules_path:
 778         case OPT_fintrinsic_modules_path_:
 779           /* Ignore these.  */
 780           continue;
 781
 782         case OPT_cpp_:
 783           /* Use "-cpp" rather than "-cpp=<temporary file>".  */
 784           len = 4;
 785           break;
 786
 787         default:
 788           /* Ignore file names.  */
 789           if (save_decoded_options[j].orig_option_with_args_text[0] != '-')
 790             continue;
 791
 792           len = strlen (save_decoded_options[j].orig_option_with_args_text);
 793         }
 794
 795       memcpy (&result[pos], save_decoded_options[j].orig_option_with_args_text, len);
 796       pos += len;
 797       result[pos++] = ' ';
 798     }
 799
 800   result[--pos] = '\0';
 801   return result;
 802 }