gcc/fortran/options.c

   1 /* Parse and display command line options.
   2    Copyright (C) 2000-2014 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 "tree.h"
  25 #include "flags.h"
  26 #include "intl.h"
  27 #include "opts.h"
  28 #include "toplev.h"  /* For save_decoded_options.  */
  29 #include "options.h"
  30 #include "params.h"
  31 #include "tree-inline.h"
  32 #include "gfortran.h"
  33 #include "target.h"
  34 #include "cpp.h"
  35 #include "diagnostic.h" /* For global_dc.  */
  36 #include "tm.h"
  37
  38 gfc_option_t gfc_option;
  39
  40
  41 /* Set flags that control warnings and errors for different
  42    Fortran standards to their default values.  Keep in sync with
  43    libgfortran/runtime/compile_options.c (init_compile_options).  */
  44
  45 static void
  46 set_default_std_flags (void)
  47 {
  48   gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL
  49     | GFC_STD_F2003 | GFC_STD_F2008 | GFC_STD_F95 | GFC_STD_F77
  50     | GFC_STD_F2008_OBS | GFC_STD_F2008_TS | GFC_STD_GNU | GFC_STD_LEGACY;
  51   gfc_option.warn_std = GFC_STD_F95_DEL | GFC_STD_LEGACY;
  52 }
  53
  54
  55 /* Return language mask for Fortran options.  */
  56
  57 unsigned int
  58 gfc_option_lang_mask (void)
  59 {
  60   return CL_Fortran;
  61 }
  62
  63 /* Initialize options structure OPTS.  */
  64
  65 void
  66 gfc_init_options_struct (struct gcc_options *opts)
  67 {
  68   opts->x_flag_errno_math = 0;
  69   opts->frontend_set_flag_errno_math = true;
  70   opts->x_flag_associative_math = -1;
  71   opts->frontend_set_flag_associative_math = true;
  72 }
  73
  74 /* Get ready for options handling. Keep in sync with
  75    libgfortran/runtime/compile_options.c (init_compile_options).  */
  76
  77 void
  78 gfc_init_options (unsigned int decoded_options_count,
  79                   struct cl_decoded_option *decoded_options)
  80 {
  81   gfc_source_file = NULL;
  82   gfc_option.module_dir = NULL;
  83   gfc_option.source_form = FORM_UNKNOWN;
  84   gfc_option.max_continue_fixed = 255;
  85   gfc_option.max_continue_free = 255;
  86   gfc_option.max_identifier_length = GFC_MAX_SYMBOL_LEN;
  87   gfc_option.max_errors = 25;
  88
  89   gfc_option.flag_preprocessed = 0;
  90   gfc_option.flag_d_lines = -1;
  91   gfc_option.flag_init_integer = GFC_INIT_INTEGER_OFF;
  92   gfc_option.flag_init_integer_value = 0;
  93   gfc_option.flag_init_logical = GFC_INIT_LOGICAL_OFF;
  94   gfc_option.flag_init_character = GFC_INIT_CHARACTER_OFF;
  95   gfc_option.flag_init_character_value = (char)0;
  96
  97   gfc_option.fpe = 0;
  98   /* All except GFC_FPE_INEXACT.  */
  99   gfc_option.fpe_summary = GFC_FPE_INVALID | GFC_FPE_DENORMAL
 100                            | GFC_FPE_ZERO | GFC_FPE_OVERFLOW
 101                            | GFC_FPE_UNDERFLOW;
 102   gfc_option.rtcheck = 0;
 103
 104   /* ??? Wmissing-include-dirs is disabled by default in C/C++ but
 105      enabled by default in Fortran.  Ideally, we should express this
 106      in .opt, but that is not supported yet.  */
 107   if (!global_options_set.x_cpp_warn_missing_include_dirs)
 108     global_options.x_cpp_warn_missing_include_dirs = 1;;
 109
 110   set_default_std_flags ();
 111
 112   /* Initialize cpp-related options.  */
 113   gfc_cpp_init_options (decoded_options_count, decoded_options);
 114   gfc_diagnostics_init ();
 115 }
 116
 117
 118 /* Determine the source form from the filename extension.  We assume
 119    case insensitivity.  */
 120
 121 static gfc_source_form
 122 form_from_filename (const char *filename)
 123 {
 124   static const struct
 125   {
 126     const char *extension;
 127     gfc_source_form form;
 128   }
 129   exttype[] =
 130   {
 131     {
 132     ".f90", FORM_FREE}
 133     ,
 134     {
 135     ".f95", FORM_FREE}
 136     ,
 137     {
 138     ".f03", FORM_FREE}
 139     ,
 140     {
 141     ".f08", FORM_FREE}
 142     ,
 143     {
 144     ".f", FORM_FIXED}
 145     ,
 146     {
 147     ".for", FORM_FIXED}
 148     ,
 149     {
 150     ".ftn", FORM_FIXED}
 151     ,
 152     {
 153     "", FORM_UNKNOWN}
 154   };            /* sentinel value */
 155
 156   gfc_source_form f_form;
 157   const char *fileext;
 158   int i;
 159
 160   /* Find end of file name.  Note, filename is either a NULL pointer or
 161      a NUL terminated string.  */
 162   i = 0;
 163   while (filename[i] != '\0')
 164     i++;
 165
 166   /* Find last period.  */
 167   while (i >= 0 && (filename[i] != '.'))
 168     i--;
 169
 170   /* Did we see a file extension?  */
 171   if (i < 0)
 172     return FORM_UNKNOWN; /* Nope  */
 173
 174   /* Get file extension and compare it to others.  */
 175   fileext = &(filename[i]);
 176
 177   i = -1;
 178   f_form = FORM_UNKNOWN;
 179   do
 180     {
 181       i++;
 182       if (strcasecmp (fileext, exttype[i].extension) == 0)
 183         {
 184           f_form = exttype[i].form;
 185           break;
 186         }
 187     }
 188   while (exttype[i].form != FORM_UNKNOWN);
 189
 190   return f_form;
 191 }
 192
 193
 194 /* Finalize commandline options.  */
 195
 196 bool
 197 gfc_post_options (const char **pfilename)
 198 {
 199   const char *filename = *pfilename, *canon_source_file = NULL;
 200   char *source_path;
 201   int i;
 202
 203   /* Excess precision other than "fast" requires front-end
 204      support.  */
 205   if (flag_excess_precision_cmdline == EXCESS_PRECISION_STANDARD
 206       && TARGET_FLT_EVAL_METHOD_NON_DEFAULT)
 207     sorry ("-fexcess-precision=standard for Fortran");
 208   flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
 209
 210   /* Fortran allows associative math - but we cannot reassociate if
 211      we want traps or signed zeros. Cf. also flag_protect_parens.  */
 212   if (flag_associative_math == -1)
 213     flag_associative_math = (!flag_trapping_math && !flag_signed_zeros);
 214
 215   if (flag_protect_parens == -1)
 216     flag_protect_parens = !optimize_fast;
 217
 218   if (flag_stack_arrays == -1)
 219     flag_stack_arrays = optimize_fast;
 220
 221   /* By default, disable (re)allocation during assignment for -std=f95,
 222      and enable it for F2003/F2008/GNU/Legacy.  */
 223   if (flag_realloc_lhs == -1)
 224     {
 225       if (gfc_option.allow_std & GFC_STD_F2003)
 226         flag_realloc_lhs = 1;
 227       else
 228         flag_realloc_lhs = 0;
 229     }
 230
 231   /* -fbounds-check is equivalent to -fcheck=bounds */
 232   if (flag_bounds_check)
 233     gfc_option.rtcheck |= GFC_RTCHECK_BOUNDS;
 234
 235   if (flag_compare_debug)
 236     flag_dump_fortran_original = 0;
 237
 238   /* Make -fmax-errors visible to gfortran's diagnostic machinery.  */
 239   if (global_options_set.x_flag_max_errors)
 240     gfc_option.max_errors = flag_max_errors;
 241
 242   /* Verify the input file name.  */
 243   if (!filename || strcmp (filename, "-") == 0)
 244     {
 245       filename = "";
 246     }
 247
 248   if (gfc_option.flag_preprocessed)
 249     {
 250       /* For preprocessed files, if the first tokens are of the form # NUM.
 251          handle the directives so we know the original file name.  */
 252       gfc_source_file = gfc_read_orig_filename (filename, &canon_source_file);
 253       if (gfc_source_file == NULL)
 254         gfc_source_file = filename;
 255       else
 256         *pfilename = gfc_source_file;
 257     }
 258   else
 259     gfc_source_file = filename;
 260
 261   if (canon_source_file == NULL)
 262     canon_source_file = gfc_source_file;
 263
 264   /* Adds the path where the source file is to the list of include files.  */
 265
 266   i = strlen (canon_source_file);
 267   while (i > 0 && !IS_DIR_SEPARATOR (canon_source_file[i]))
 268     i--;
 269
 270   if (i != 0)
 271     {
 272       source_path = (char *) alloca (i + 1);
 273       memcpy (source_path, canon_source_file, i);
 274       source_path[i] = 0;
 275       gfc_add_include_path (source_path, true, true, true);
 276     }
 277   else
 278     gfc_add_include_path (".", true, true, true);
 279
 280   if (canon_source_file != gfc_source_file)
 281     free (CONST_CAST (char *, canon_source_file));
 282
 283   /* Decide which form the file will be read in as.  */
 284
 285   if (gfc_option.source_form != FORM_UNKNOWN)
 286     gfc_current_form = gfc_option.source_form;
 287   else
 288     {
 289       gfc_current_form = form_from_filename (filename);
 290
 291       if (gfc_current_form == FORM_UNKNOWN)
 292         {
 293           gfc_current_form = FORM_FREE;
 294           gfc_warning_now ("Reading file %qs as free form",
 295                            (filename[0] == '\0') ? "<stdin>" : filename);
 296         }
 297     }
 298
 299   /* If the user specified -fd-lines-as-{code|comments} verify that we're
 300      in fixed form.  */
 301   if (gfc_current_form == FORM_FREE)
 302     {
 303       if (gfc_option.flag_d_lines == 0)
 304         gfc_warning_now ("%<-fd-lines-as-comments%> has no effect "
 305                            "in free form");
 306       else if (gfc_option.flag_d_lines == 1)
 307         gfc_warning_now ("%<-fd-lines-as-code%> has no effect in free form");
 308     }
 309
 310   /* If -pedantic, warn about the use of GNU extensions.  */
 311   if (pedantic && (gfc_option.allow_std & GFC_STD_GNU) != 0)
 312     gfc_option.warn_std |= GFC_STD_GNU;
 313   /* -std=legacy -pedantic is effectively -std=gnu.  */
 314   if (pedantic && (gfc_option.allow_std & GFC_STD_LEGACY) != 0)
 315     gfc_option.warn_std |= GFC_STD_F95_OBS | GFC_STD_F95_DEL | GFC_STD_LEGACY;
 316
 317   /* If the user didn't explicitly specify -f(no)-second-underscore we
 318      use it if we're trying to be compatible with f2c, and not
 319      otherwise.  */
 320   if (flag_second_underscore == -1)
 321     flag_second_underscore = flag_f2c;
 322
 323   if (!flag_automatic && flag_max_stack_var_size != -2
 324       && flag_max_stack_var_size != 0)
 325     gfc_warning_now ("Flag %<-fno-automatic%> overwrites %<-fmax-stack-var-size=%d%>",
 326                      flag_max_stack_var_size);
 327   else if (!flag_automatic && flag_recursive)
 328     gfc_warning_now ("Flag %<-fno-automatic%> overwrites %<-frecursive%>");
 329   else if (!flag_automatic && flag_openmp)
 330     gfc_warning_now ("Flag %<-fno-automatic%> overwrites %<-frecursive%> implied by "
 331                      "%<-fopenmp%>");
 332   else if (flag_max_stack_var_size != -2 && flag_recursive)
 333     gfc_warning_now ("Flag %<-frecursive%> overwrites %<-fmax-stack-var-size=%d%>",
 334                      flag_max_stack_var_size);
 335   else if (flag_max_stack_var_size != -2 && flag_openmp)
 336     gfc_warning_now ("Flag %<-fmax-stack-var-size=%d%> overwrites %<-frecursive%> "
 337                      "implied by %<-fopenmp%>", flag_max_stack_var_size);
 338
 339   /* Implement -frecursive as -fmax-stack-var-size=-1.  */
 340   if (flag_recursive)
 341     flag_max_stack_var_size = -1;
 342
 343   /* Implied -frecursive; implemented as -fmax-stack-var-size=-1.  */
 344   if (flag_max_stack_var_size == -2 && flag_openmp && flag_automatic)
 345     {
 346       flag_recursive = 1;
 347       flag_max_stack_var_size = -1;
 348     }
 349
 350   /* Set default.  */
 351   if (flag_max_stack_var_size == -2)
 352     flag_max_stack_var_size = 32768;
 353
 354   /* Implement -fno-automatic as -fmax-stack-var-size=0.  */
 355   if (!flag_automatic)
 356     flag_max_stack_var_size = 0;
 357
 358   /* Optimization implies front end optimization, unless the user
 359      specified it directly.  */
 360
 361   if (flag_frontend_optimize == -1)
 362     flag_frontend_optimize = optimize;
 363
 364   if (flag_max_array_constructor < 65535)
 365     flag_max_array_constructor = 65535;
 366
 367   if (flag_fixed_line_length != 0 && flag_fixed_line_length < 7)
 368     gfc_fatal_error ("Fixed line length must be at least seven");
 369
 370   if (flag_free_line_length != 0 && flag_free_line_length < 4)
 371     gfc_fatal_error ("Free line length must be at least three");
 372
 373   if (flag_max_subrecord_length > MAX_SUBRECORD_LENGTH)
 374     gfc_fatal_error ("Maximum subrecord length cannot exceed %d",
 375                      MAX_SUBRECORD_LENGTH);
 376
 377   gfc_cpp_post_options ();
 378
 379   return gfc_cpp_preprocess_only ();
 380 }
 381
 382
 383 static void
 384 gfc_handle_module_path_options (const char *arg)
 385 {
 386
 387   if (gfc_option.module_dir != NULL)
 388     gfc_fatal_error ("gfortran: Only one %<-J%> option allowed");
 389
 390   gfc_option.module_dir = XCNEWVEC (char, strlen (arg) + 2);
 391   strcpy (gfc_option.module_dir, arg);
 392
 393   gfc_add_include_path (gfc_option.module_dir, true, false, true);
 394
 395   strcat (gfc_option.module_dir, "/");
 396 }
 397
 398
 399 /* Handle options -ffpe-trap= and -ffpe-summary=.  */
 400
 401 static void
 402 gfc_handle_fpe_option (const char *arg, bool trap)
 403 {
 404   int result, pos = 0, n;
 405   /* precision is a backwards compatibility alias for inexact.  */
 406   static const char * const exception[] = { "invalid", "denormal", "zero",
 407                                             "overflow", "underflow",
 408                                             "inexact", "precision", NULL };
 409   static const int opt_exception[] = { GFC_FPE_INVALID, GFC_FPE_DENORMAL,
 410                                        GFC_FPE_ZERO, GFC_FPE_OVERFLOW,
 411                                        GFC_FPE_UNDERFLOW, GFC_FPE_INEXACT,
 412                                        GFC_FPE_INEXACT,
 413                                        0 };
 414
 415   /* As the default for -ffpe-summary= is nonzero, set it to 0.  */
 416   if (!trap)
 417     gfc_option.fpe_summary = 0;
 418
 419   while (*arg)
 420     {
 421       while (*arg == ',')
 422         arg++;
 423
 424       while (arg[pos] && arg[pos] != ',')
 425         pos++;
 426
 427       result = 0;
 428       if (!trap && strncmp ("none", arg, pos) == 0)
 429         {
 430           gfc_option.fpe_summary = 0;
 431           arg += pos;
 432           pos = 0;
 433           continue;
 434         }
 435       else if (!trap && strncmp ("all", arg, pos) == 0)
 436         {
 437           gfc_option.fpe_summary = GFC_FPE_INVALID | GFC_FPE_DENORMAL
 438                                    | GFC_FPE_ZERO | GFC_FPE_OVERFLOW
 439                                    | GFC_FPE_UNDERFLOW | GFC_FPE_INEXACT;
 440           arg += pos;
 441           pos = 0;
 442           continue;
 443         }
 444       else
 445         for (n = 0; exception[n] != NULL; n++)
 446           {
 447           if (exception[n] && strncmp (exception[n], arg, pos) == 0)
 448             {
 449               if (trap)
 450                 gfc_option.fpe |= opt_exception[n];
 451               else
 452                 gfc_option.fpe_summary |= opt_exception[n];
 453               arg += pos;
 454               pos = 0;
 455               result = 1;
 456               break;
 457             }
 458           }
 459       if (!result && !trap)
 460         gfc_fatal_error ("Argument to %<-ffpe-trap%> is not valid: %s", arg);
 461       else if (!result)
 462         gfc_fatal_error ("Argument to %<-ffpe-summary%> is not valid: %s", arg);
 463
 464     }
 465 }
 466
 467
 468 static void
 469 gfc_handle_runtime_check_option (const char *arg)
 470 {
 471   int result, pos = 0, n;
 472   static const char * const optname[] = { "all", "bounds", "array-temps",
 473                                           "recursion", "do", "pointer",
 474                                           "mem", NULL };
 475   static const int optmask[] = { GFC_RTCHECK_ALL, GFC_RTCHECK_BOUNDS,
 476                                  GFC_RTCHECK_ARRAY_TEMPS,
 477                                  GFC_RTCHECK_RECURSION, GFC_RTCHECK_DO,
 478                                  GFC_RTCHECK_POINTER, GFC_RTCHECK_MEM,
 479                                  0 };
 480
 481   while (*arg)
 482     {
 483       while (*arg == ',')
 484         arg++;
 485
 486       while (arg[pos] && arg[pos] != ',')
 487         pos++;
 488
 489       result = 0;
 490       for (n = 0; optname[n] != NULL; n++)
 491         {
 492           if (optname[n] && strncmp (optname[n], arg, pos) == 0)
 493             {
 494               gfc_option.rtcheck |= optmask[n];
 495               arg += pos;
 496               pos = 0;
 497               result = 1;
 498               break;
 499             }
 500         }
 501       if (!result)
 502         gfc_fatal_error ("Argument to %<-fcheck%> is not valid: %s", arg);
 503     }
 504 }
 505
 506
 507 /* Handle command-line options.  Returns 0 if unrecognized, 1 if
 508    recognized and handled.  */
 509
 510 bool
 511 gfc_handle_option (size_t scode, const char *arg, int value,
 512                    int kind ATTRIBUTE_UNUSED, location_t loc ATTRIBUTE_UNUSED,
 513                    const struct cl_option_handlers *handlers ATTRIBUTE_UNUSED)
 514 {
 515   bool result = true;
 516   enum opt_code code = (enum opt_code) scode;
 517
 518   if (gfc_cpp_handle_option (scode, arg, value) == 1)
 519     return true;
 520
 521   switch (code)
 522     {
 523     default:
 524       if (cl_options[code].flags & gfc_option_lang_mask ())
 525         break;
 526       result = false;
 527       break;
 528
 529     case OPT_fcheck_array_temporaries:
 530       gfc_option.rtcheck |= GFC_RTCHECK_ARRAY_TEMPS;
 531       break;
 532
 533     case OPT_fd_lines_as_code:
 534       gfc_option.flag_d_lines = 1;
 535       break;
 536
 537     case OPT_fd_lines_as_comments:
 538       gfc_option.flag_d_lines = 0;
 539       break;
 540
 541     case OPT_ffixed_form:
 542       gfc_option.source_form = FORM_FIXED;
 543       break;
 544
 545     case OPT_ffree_form:
 546       gfc_option.source_form = FORM_FREE;
 547       break;
 548
 549     case OPT_static_libgfortran:
 550 #ifndef HAVE_LD_STATIC_DYNAMIC
 551       gfc_fatal_error ("%<-static-libgfortran%> is not supported in this "
 552                        "configuration");
 553 #endif
 554       break;
 555
 556     case OPT_fintrinsic_modules_path:
 557     case OPT_fintrinsic_modules_path_:
 558
 559       /* This is needed because omp_lib.h is in a directory together
 560          with intrinsic modules.  Do no warn because during testing
 561          without an installed compiler, we would get lots of bogus
 562          warnings for a missing include directory.  */
 563       gfc_add_include_path (arg, false, false, false);
 564
 565       gfc_add_intrinsic_modules_path (arg);
 566       break;
 567
 568     case OPT_fpreprocessed:
 569       gfc_option.flag_preprocessed = value;
 570       break;
 571
 572     case OPT_fmax_identifier_length_:
 573       if (value > GFC_MAX_SYMBOL_LEN)
 574         gfc_fatal_error ("Maximum supported identifier length is %d",
 575                          GFC_MAX_SYMBOL_LEN);
 576       gfc_option.max_identifier_length = value;
 577       break;
 578
 579     case OPT_finit_local_zero:
 580       gfc_option.flag_init_integer = GFC_INIT_INTEGER_ON;
 581       gfc_option.flag_init_integer_value = 0;
 582       flag_init_real = GFC_INIT_REAL_ZERO;
 583       gfc_option.flag_init_logical = GFC_INIT_LOGICAL_FALSE;
 584       gfc_option.flag_init_character = GFC_INIT_CHARACTER_ON;
 585       gfc_option.flag_init_character_value = (char)0;
 586       break;
 587
 588     case OPT_finit_logical_:
 589       if (!strcasecmp (arg, "false"))
 590         gfc_option.flag_init_logical = GFC_INIT_LOGICAL_FALSE;
 591       else if (!strcasecmp (arg, "true"))
 592         gfc_option.flag_init_logical = GFC_INIT_LOGICAL_TRUE;
 593       else
 594         gfc_fatal_error ("Unrecognized option to %<-finit-logical%>: %s",
 595                          arg);
 596       break;
 597
 598     case OPT_finit_integer_:
 599       gfc_option.flag_init_integer = GFC_INIT_INTEGER_ON;
 600       gfc_option.flag_init_integer_value = atoi (arg);
 601       break;
 602
 603     case OPT_finit_character_:
 604       if (value >= 0 && value <= 127)
 605         {
 606           gfc_option.flag_init_character = GFC_INIT_CHARACTER_ON;
 607           gfc_option.flag_init_character_value = (char)value;
 608         }
 609       else
 610         gfc_fatal_error ("The value of n in %<-finit-character=n%> must be "
 611                          "between 0 and 127");
 612       break;
 613
 614     case OPT_I:
 615       gfc_add_include_path (arg, true, false, true);
 616       break;
 617
 618     case OPT_J:
 619       gfc_handle_module_path_options (arg);
 620       break;
 621
 622     case OPT_ffpe_trap_:
 623       gfc_handle_fpe_option (arg, true);
 624       break;
 625
 626     case OPT_ffpe_summary_:
 627       gfc_handle_fpe_option (arg, false);
 628       break;
 629
 630     case OPT_std_f95:
 631       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F95 | GFC_STD_F77
 632                              | GFC_STD_F2008_OBS;
 633       gfc_option.warn_std = GFC_STD_F95_OBS;
 634       gfc_option.max_continue_fixed = 19;
 635       gfc_option.max_continue_free = 39;
 636       gfc_option.max_identifier_length = 31;
 637       warn_ampersand = 1;
 638       warn_tabs = 1;
 639       break;
 640
 641     case OPT_std_f2003:
 642       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F77
 643         | GFC_STD_F2003 | GFC_STD_F95 | GFC_STD_F2008_OBS;
 644       gfc_option.warn_std = GFC_STD_F95_OBS;
 645       gfc_option.max_identifier_length = 63;
 646       warn_ampersand = 1;
 647       warn_tabs = 1;
 648       break;
 649
 650     case OPT_std_f2008:
 651       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F77
 652         | GFC_STD_F2003 | GFC_STD_F95 | GFC_STD_F2008 | GFC_STD_F2008_OBS;
 653       gfc_option.warn_std = GFC_STD_F95_OBS | GFC_STD_F2008_OBS;
 654       gfc_option.max_identifier_length = 63;
 655       warn_ampersand = 1;
 656       warn_tabs = 1;
 657       break;
 658
 659     case OPT_std_f2008ts:
 660       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F77
 661         | GFC_STD_F2003 | GFC_STD_F95 | GFC_STD_F2008 | GFC_STD_F2008_OBS
 662         | GFC_STD_F2008_TS;
 663       gfc_option.warn_std = GFC_STD_F95_OBS | GFC_STD_F2008_OBS;
 664       gfc_option.max_identifier_length = 63;
 665       warn_ampersand = 1;
 666       warn_tabs = 1;
 667       break;
 668
 669     case OPT_std_gnu:
 670       set_default_std_flags ();
 671       break;
 672
 673     case OPT_std_legacy:
 674       set_default_std_flags ();
 675       gfc_option.warn_std = 0;
 676       break;
 677
 678     case OPT_fshort_enums:
 679       /* Handled in language-independent code.  */
 680       break;
 681
 682     case OPT_fcheck_:
 683       gfc_handle_runtime_check_option (arg);
 684       break;
 685     }
 686
 687   Fortran_handle_option_auto (&global_options, &global_options_set,
 688                               scode, arg, value,
 689                               gfc_option_lang_mask (), kind,
 690                               loc, handlers, global_dc);
 691   return result;
 692 }
 693
 694
 695 /* Return a string with the options passed to the compiler; used for
 696    Fortran's compiler_options() intrinsic.  */
 697
 698 char *
 699 gfc_get_option_string (void)
 700 {
 701   unsigned j;
 702   size_t len, pos;
 703   char *result;
 704
 705   /* Allocate and return a one-character string with '\0'.  */
 706   if (!save_decoded_options_count)
 707     return XCNEWVEC (char, 1);
 708
 709   /* Determine required string length.  */
 710
 711   len = 0;
 712   for (j = 1; j < save_decoded_options_count; j++)
 713     {
 714       switch (save_decoded_options[j].opt_index)
 715         {
 716         case OPT_o:
 717         case OPT_d:
 718         case OPT_dumpbase:
 719         case OPT_dumpdir:
 720         case OPT_auxbase:
 721         case OPT_quiet:
 722         case OPT_version:
 723         case OPT_fintrinsic_modules_path:
 724         case OPT_fintrinsic_modules_path_:
 725           /* Ignore these.  */
 726           break;
 727         default:
 728           /* Ignore file names.  */
 729           if (save_decoded_options[j].orig_option_with_args_text[0] == '-')
 730             len += 1
 731                  + strlen (save_decoded_options[j].orig_option_with_args_text);
 732         }
 733     }
 734
 735   result = XCNEWVEC (char, len);
 736
 737   pos = 0;
 738   for (j = 1; j < save_decoded_options_count; j++)
 739     {
 740       switch (save_decoded_options[j].opt_index)
 741         {
 742         case OPT_o:
 743         case OPT_d:
 744         case OPT_dumpbase:
 745         case OPT_dumpdir:
 746         case OPT_auxbase:
 747         case OPT_quiet:
 748         case OPT_version:
 749         case OPT_fintrinsic_modules_path:
 750         case OPT_fintrinsic_modules_path_:
 751           /* Ignore these.  */
 752           continue;
 753
 754         case OPT_cpp_:
 755           /* Use "-cpp" rather than "-cpp=<temporary file>".  */
 756           len = 4;
 757           break;
 758
 759         default:
 760           /* Ignore file names.  */
 761           if (save_decoded_options[j].orig_option_with_args_text[0] != '-')
 762             continue;
 763
 764           len = strlen (save_decoded_options[j].orig_option_with_args_text);
 765         }
 766
 767       memcpy (&result[pos], save_decoded_options[j].orig_option_with_args_text, len);
 768       pos += len;
 769       result[pos++] = ' ';
 770     }
 771
 772   result[--pos] = '\0';
 773   return result;
 774 }