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->x_flag_associative_math = -1;
  70 }
  71
  72 /* Get ready for options handling. Keep in sync with
  73    libgfortran/runtime/compile_options.c (init_compile_options). */
  74
  75 void
  76 gfc_init_options (unsigned int decoded_options_count,
  77                   struct cl_decoded_option *decoded_options)
  78 {
  79   gfc_source_file = NULL;
  80   gfc_option.module_dir = NULL;
  81   gfc_option.source_form = FORM_UNKNOWN;
  82   gfc_option.fixed_line_length = 72;
  83   gfc_option.free_line_length = 132;
  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_subrecord_length = 0;
  88   gfc_option.flag_max_array_constructor = 65535;
  89   gfc_option.convert = GFC_CONVERT_NATIVE;
  90   gfc_option.record_marker = 0;
  91   gfc_option.dump_fortran_original = 0;
  92   gfc_option.dump_fortran_optimized = 0;
  93
  94   gfc_option.warn_aliasing = 0;
  95   gfc_option.warn_ampersand = 0;
  96   gfc_option.warn_character_truncation = 0;
  97   gfc_option.warn_array_temp = 0;
  98   gfc_option.warn_c_binding_type = 0;
  99   gfc_option.gfc_warn_conversion = 0;
 100   gfc_option.warn_conversion_extra = 0;
 101   gfc_option.warn_function_elimination = 0;
 102   gfc_option.warn_implicit_interface = 0;
 103   gfc_option.warn_line_truncation = 0;
 104   gfc_option.warn_surprising = 0;
 105   gfc_option.warn_tabs = 1;
 106   gfc_option.warn_underflow = 1;
 107   gfc_option.warn_intrinsic_shadow = 0;
 108   gfc_option.warn_intrinsics_std = 0;
 109   gfc_option.warn_align_commons = 1;
 110   gfc_option.warn_real_q_constant = 0;
 111   gfc_option.warn_unused_dummy_argument = 0;
 112   gfc_option.warn_zerotrip = 0;
 113   gfc_option.warn_realloc_lhs = 0;
 114   gfc_option.warn_realloc_lhs_all = 0;
 115   gfc_option.warn_compare_reals = 0;
 116   gfc_option.warn_target_lifetime = 0;
 117   gfc_option.max_errors = 25;
 118
 119   gfc_option.flag_all_intrinsics = 0;
 120   gfc_option.flag_default_double = 0;
 121   gfc_option.flag_default_integer = 0;
 122   gfc_option.flag_default_real = 0;
 123   gfc_option.flag_integer4_kind = 0;
 124   gfc_option.flag_real4_kind = 0;
 125   gfc_option.flag_real8_kind = 0;
 126   gfc_option.flag_dollar_ok = 0;
 127   gfc_option.flag_underscoring = 1;
 128   gfc_option.flag_f2c = 0;
 129   gfc_option.flag_second_underscore = -1;
 130   gfc_option.flag_implicit_none = 0;
 131
 132   /* Default value of flag_max_stack_var_size is set in gfc_post_options.  */
 133   gfc_option.flag_max_stack_var_size = -2;
 134   gfc_option.flag_stack_arrays = -1;
 135
 136   gfc_option.flag_range_check = 1;
 137   gfc_option.flag_pack_derived = 0;
 138   gfc_option.flag_repack_arrays = 0;
 139   gfc_option.flag_preprocessed = 0;
 140   gfc_option.flag_automatic = 1;
 141   gfc_option.flag_backslash = 0;
 142   gfc_option.flag_module_private = 0;
 143   gfc_option.flag_backtrace = 1;
 144   gfc_option.flag_allow_leading_underscore = 0;
 145   gfc_option.flag_external_blas = 0;
 146   gfc_option.blas_matmul_limit = 30;
 147   gfc_option.flag_cray_pointer = 0;
 148   gfc_option.flag_d_lines = -1;
 149   gfc_option.gfc_flag_openmp = 0;
 150   gfc_option.flag_sign_zero = 1;
 151   gfc_option.flag_recursive = 0;
 152   gfc_option.flag_init_integer = GFC_INIT_INTEGER_OFF;
 153   gfc_option.flag_init_integer_value = 0;
 154   gfc_option.flag_init_real = GFC_INIT_REAL_OFF;
 155   gfc_option.flag_init_logical = GFC_INIT_LOGICAL_OFF;
 156   gfc_option.flag_init_character = GFC_INIT_CHARACTER_OFF;
 157   gfc_option.flag_init_character_value = (char)0;
 158   gfc_option.flag_align_commons = 1;
 159   gfc_option.flag_protect_parens = -1;
 160   gfc_option.flag_realloc_lhs = -1;
 161   gfc_option.flag_aggressive_function_elimination = 0;
 162   gfc_option.flag_frontend_optimize = -1;
 163
 164   gfc_option.fpe = 0;
 165   /* All except GFC_FPE_INEXACT.  */
 166   gfc_option.fpe_summary = GFC_FPE_INVALID | GFC_FPE_DENORMAL
 167                            | GFC_FPE_ZERO | GFC_FPE_OVERFLOW
 168                            | GFC_FPE_UNDERFLOW;
 169   gfc_option.rtcheck = 0;
 170   gfc_option.coarray = GFC_FCOARRAY_NONE;
 171
 172   set_default_std_flags ();
 173
 174   /* Initialize cpp-related options.  */
 175   gfc_cpp_init_options (decoded_options_count, decoded_options);
 176 }
 177
 178
 179 /* Determine the source form from the filename extension.  We assume
 180    case insensitivity.  */
 181
 182 static gfc_source_form
 183 form_from_filename (const char *filename)
 184 {
 185   static const struct
 186   {
 187     const char *extension;
 188     gfc_source_form form;
 189   }
 190   exttype[] =
 191   {
 192     {
 193     ".f90", FORM_FREE}
 194     ,
 195     {
 196     ".f95", FORM_FREE}
 197     ,
 198     {
 199     ".f03", FORM_FREE}
 200     ,
 201     {
 202     ".f08", FORM_FREE}
 203     ,
 204     {
 205     ".f", FORM_FIXED}
 206     ,
 207     {
 208     ".for", FORM_FIXED}
 209     ,
 210     {
 211     ".ftn", FORM_FIXED}
 212     ,
 213     {
 214     "", FORM_UNKNOWN}
 215   };            /* sentinel value */
 216
 217   gfc_source_form f_form;
 218   const char *fileext;
 219   int i;
 220
 221   /* Find end of file name.  Note, filename is either a NULL pointer or
 222      a NUL terminated string.  */
 223   i = 0;
 224   while (filename[i] != '\0')
 225     i++;
 226
 227   /* Find last period.  */
 228   while (i >= 0 && (filename[i] != '.'))
 229     i--;
 230
 231   /* Did we see a file extension?  */
 232   if (i < 0)
 233     return FORM_UNKNOWN; /* Nope  */
 234
 235   /* Get file extension and compare it to others.  */
 236   fileext = &(filename[i]);
 237
 238   i = -1;
 239   f_form = FORM_UNKNOWN;
 240   do
 241     {
 242       i++;
 243       if (strcasecmp (fileext, exttype[i].extension) == 0)
 244         {
 245           f_form = exttype[i].form;
 246           break;
 247         }
 248     }
 249   while (exttype[i].form != FORM_UNKNOWN);
 250
 251   return f_form;
 252 }
 253
 254
 255 /* Finalize commandline options.  */
 256
 257 bool
 258 gfc_post_options (const char **pfilename)
 259 {
 260   const char *filename = *pfilename, *canon_source_file = NULL;
 261   char *source_path;
 262   int i;
 263
 264   /* Excess precision other than "fast" requires front-end
 265      support.  */
 266   if (flag_excess_precision_cmdline == EXCESS_PRECISION_STANDARD
 267       && TARGET_FLT_EVAL_METHOD_NON_DEFAULT)
 268     sorry ("-fexcess-precision=standard for Fortran");
 269   flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
 270
 271   /* Fortran allows associative math - but we cannot reassociate if
 272      we want traps or signed zeros. Cf. also flag_protect_parens.  */
 273   if (flag_associative_math == -1)
 274     flag_associative_math = (!flag_trapping_math && !flag_signed_zeros);
 275
 276   if (gfc_option.flag_protect_parens == -1)
 277     gfc_option.flag_protect_parens = !optimize_fast;
 278
 279   if (gfc_option.flag_stack_arrays == -1)
 280     gfc_option.flag_stack_arrays = optimize_fast;
 281
 282   /* By default, disable (re)allocation during assignment for -std=f95,
 283      and enable it for F2003/F2008/GNU/Legacy. */
 284   if (gfc_option.flag_realloc_lhs == -1)
 285     {
 286       if (gfc_option.allow_std & GFC_STD_F2003)
 287         gfc_option.flag_realloc_lhs = 1;
 288       else
 289         gfc_option.flag_realloc_lhs = 0;
 290     }
 291
 292   /* -fbounds-check is equivalent to -fcheck=bounds */
 293   if (flag_bounds_check)
 294     gfc_option.rtcheck |= GFC_RTCHECK_BOUNDS;
 295
 296   if (flag_compare_debug)
 297     gfc_option.dump_fortran_original = 0;
 298
 299   /* Make -fmax-errors visible to gfortran's diagnostic machinery.  */
 300   if (global_options_set.x_flag_max_errors)
 301     gfc_option.max_errors = flag_max_errors;
 302
 303   /* Verify the input file name.  */
 304   if (!filename || strcmp (filename, "-") == 0)
 305     {
 306       filename = "";
 307     }
 308
 309   if (gfc_option.flag_preprocessed)
 310     {
 311       /* For preprocessed files, if the first tokens are of the form # NUM.
 312          handle the directives so we know the original file name.  */
 313       gfc_source_file = gfc_read_orig_filename (filename, &canon_source_file);
 314       if (gfc_source_file == NULL)
 315         gfc_source_file = filename;
 316       else
 317         *pfilename = gfc_source_file;
 318     }
 319   else
 320     gfc_source_file = filename;
 321
 322   if (canon_source_file == NULL)
 323     canon_source_file = gfc_source_file;
 324
 325   /* Adds the path where the source file is to the list of include files.  */
 326
 327   i = strlen (canon_source_file);
 328   while (i > 0 && !IS_DIR_SEPARATOR (canon_source_file[i]))
 329     i--;
 330
 331   if (i != 0)
 332     {
 333       source_path = (char *) alloca (i + 1);
 334       memcpy (source_path, canon_source_file, i);
 335       source_path[i] = 0;
 336       gfc_add_include_path (source_path, true, true, true);
 337     }
 338   else
 339     gfc_add_include_path (".", true, true, true);
 340
 341   if (canon_source_file != gfc_source_file)
 342     free (CONST_CAST (char *, canon_source_file));
 343
 344   /* Decide which form the file will be read in as.  */
 345
 346   if (gfc_option.source_form != FORM_UNKNOWN)
 347     gfc_current_form = gfc_option.source_form;
 348   else
 349     {
 350       gfc_current_form = form_from_filename (filename);
 351
 352       if (gfc_current_form == FORM_UNKNOWN)
 353         {
 354           gfc_current_form = FORM_FREE;
 355           gfc_warning_now ("Reading file '%s' as free form",
 356                            (filename[0] == '\0') ? "<stdin>" : filename);
 357         }
 358     }
 359
 360   /* If the user specified -fd-lines-as-{code|comments} verify that we're
 361      in fixed form.  */
 362   if (gfc_current_form == FORM_FREE)
 363     {
 364       if (gfc_option.flag_d_lines == 0)
 365         gfc_warning_now ("'-fd-lines-as-comments' has no effect "
 366                          "in free form");
 367       else if (gfc_option.flag_d_lines == 1)
 368         gfc_warning_now ("'-fd-lines-as-code' has no effect in free form");
 369     }
 370
 371   /* If -pedantic, warn about the use of GNU extensions.  */
 372   if (pedantic && (gfc_option.allow_std & GFC_STD_GNU) != 0)
 373     gfc_option.warn_std |= GFC_STD_GNU;
 374   /* -std=legacy -pedantic is effectively -std=gnu.  */
 375   if (pedantic && (gfc_option.allow_std & GFC_STD_LEGACY) != 0)
 376     gfc_option.warn_std |= GFC_STD_F95_OBS | GFC_STD_F95_DEL | GFC_STD_LEGACY;
 377
 378   /* If the user didn't explicitly specify -f(no)-second-underscore we
 379      use it if we're trying to be compatible with f2c, and not
 380      otherwise.  */
 381   if (gfc_option.flag_second_underscore == -1)
 382     gfc_option.flag_second_underscore = gfc_option.flag_f2c;
 383
 384   if (!gfc_option.flag_automatic && gfc_option.flag_max_stack_var_size != -2
 385       && gfc_option.flag_max_stack_var_size != 0)
 386     gfc_warning_now ("Flag -fno-automatic overwrites -fmax-stack-var-size=%d",
 387                      gfc_option.flag_max_stack_var_size);
 388   else if (!gfc_option.flag_automatic && gfc_option.flag_recursive)
 389     gfc_warning_now ("Flag -fno-automatic overwrites -frecursive");
 390   else if (!gfc_option.flag_automatic && gfc_option.gfc_flag_openmp)
 391     gfc_warning_now ("Flag -fno-automatic overwrites -frecursive implied by "
 392                      "-fopenmp");
 393   else if (gfc_option.flag_max_stack_var_size != -2
 394            && gfc_option.flag_recursive)
 395     gfc_warning_now ("Flag -frecursive overwrites -fmax-stack-var-size=%d",
 396                      gfc_option.flag_max_stack_var_size);
 397   else if (gfc_option.flag_max_stack_var_size != -2
 398            && gfc_option.gfc_flag_openmp)
 399     gfc_warning_now ("Flag -fmax-stack-var-size=%d overwrites -frecursive "
 400                      "implied by -fopenmp",
 401                      gfc_option.flag_max_stack_var_size);
 402
 403   /* Implement -frecursive as -fmax-stack-var-size=-1.  */
 404   if (gfc_option.flag_recursive)
 405     gfc_option.flag_max_stack_var_size = -1;
 406
 407   /* Implied -frecursive; implemented as -fmax-stack-var-size=-1.  */
 408   if (gfc_option.flag_max_stack_var_size == -2 && gfc_option.gfc_flag_openmp
 409       && gfc_option.flag_automatic)
 410     {
 411       gfc_option.flag_recursive = 1;
 412       gfc_option.flag_max_stack_var_size = -1;
 413     }
 414
 415   /* Set default.  */
 416   if (gfc_option.flag_max_stack_var_size == -2)
 417     gfc_option.flag_max_stack_var_size = 32768;
 418
 419   /* Implement -fno-automatic as -fmax-stack-var-size=0.  */
 420   if (!gfc_option.flag_automatic)
 421     gfc_option.flag_max_stack_var_size = 0;
 422
 423   if (pedantic)
 424     {
 425       gfc_option.warn_ampersand = 1;
 426       gfc_option.warn_tabs = 0;
 427     }
 428
 429   /* Optimization implies front end optimization, unless the user
 430      specified it directly.  */
 431
 432   if (gfc_option.flag_frontend_optimize == -1)
 433     gfc_option.flag_frontend_optimize = optimize;
 434
 435   if (gfc_option.warn_realloc_lhs_all)
 436     gfc_option.warn_realloc_lhs = 1;
 437
 438   gfc_cpp_post_options ();
 439
 440   return gfc_cpp_preprocess_only ();
 441 }
 442
 443
 444 /* Set the options for -Wall.  */
 445
 446 static void
 447 set_Wall (int setting)
 448 {
 449   gfc_option.warn_aliasing = setting;
 450   gfc_option.warn_ampersand = setting;
 451   gfc_option.warn_c_binding_type = setting;
 452   gfc_option.gfc_warn_conversion = setting;
 453   gfc_option.warn_line_truncation = setting;
 454   gfc_option.warn_surprising = setting;
 455   gfc_option.warn_tabs = !setting;
 456   gfc_option.warn_underflow = setting;
 457   gfc_option.warn_intrinsic_shadow = setting;
 458   gfc_option.warn_intrinsics_std = setting;
 459   gfc_option.warn_character_truncation = setting;
 460   gfc_option.warn_real_q_constant = setting;
 461   gfc_option.warn_unused_dummy_argument = setting;
 462   gfc_option.warn_target_lifetime = setting;
 463   gfc_option.warn_zerotrip = setting;
 464
 465   warn_return_type = setting;
 466   warn_uninitialized = setting;
 467   warn_maybe_uninitialized = setting;
 468 }
 469
 470 /* Set the options for -Wextra.  */
 471
 472 static void
 473 set_Wextra (int setting)
 474 {
 475   gfc_option.warn_compare_reals = setting;
 476 }
 477
 478 static void
 479 gfc_handle_module_path_options (const char *arg)
 480 {
 481
 482   if (gfc_option.module_dir != NULL)
 483     gfc_fatal_error ("gfortran: Only one -J option allowed");
 484
 485   gfc_option.module_dir = XCNEWVEC (char, strlen (arg) + 2);
 486   strcpy (gfc_option.module_dir, arg);
 487
 488   gfc_add_include_path (gfc_option.module_dir, true, false, true);
 489
 490   strcat (gfc_option.module_dir, "/");
 491 }
 492
 493
 494 /* Handle options -ffpe-trap= and -ffpe-summary=.  */
 495
 496 static void
 497 gfc_handle_fpe_option (const char *arg, bool trap)
 498 {
 499   int result, pos = 0, n;
 500   /* precision is a backwards compatibility alias for inexact.  */
 501   static const char * const exception[] = { "invalid", "denormal", "zero",
 502                                             "overflow", "underflow",
 503                                             "inexact", "precision", NULL };
 504   static const int opt_exception[] = { GFC_FPE_INVALID, GFC_FPE_DENORMAL,
 505                                        GFC_FPE_ZERO, GFC_FPE_OVERFLOW,
 506                                        GFC_FPE_UNDERFLOW, GFC_FPE_INEXACT,
 507                                        GFC_FPE_INEXACT,
 508                                        0 };
 509
 510   /* As the default for -ffpe-summary= is nonzero, set it to 0. */
 511   if (!trap)
 512     gfc_option.fpe_summary = 0;
 513
 514   while (*arg)
 515     {
 516       while (*arg == ',')
 517         arg++;
 518
 519       while (arg[pos] && arg[pos] != ',')
 520         pos++;
 521
 522       result = 0;
 523       if (!trap && strncmp ("none", arg, pos) == 0)
 524         {
 525           gfc_option.fpe_summary = 0;
 526           arg += pos;
 527           pos = 0;
 528           continue;
 529         }
 530       else if (!trap && strncmp ("all", arg, pos) == 0)
 531         {
 532           gfc_option.fpe_summary = GFC_FPE_INVALID | GFC_FPE_DENORMAL
 533                                    | GFC_FPE_ZERO | GFC_FPE_OVERFLOW
 534                                    | GFC_FPE_UNDERFLOW | GFC_FPE_INEXACT;
 535           arg += pos;
 536           pos = 0;
 537           continue;
 538         }
 539       else
 540         for (n = 0; exception[n] != NULL; n++)
 541           {
 542           if (exception[n] && strncmp (exception[n], arg, pos) == 0)
 543             {
 544               if (trap)
 545                 gfc_option.fpe |= opt_exception[n];
 546               else
 547                 gfc_option.fpe_summary |= opt_exception[n];
 548               arg += pos;
 549               pos = 0;
 550               result = 1;
 551               break;
 552             }
 553           }
 554       if (!result && !trap)
 555         gfc_fatal_error ("Argument to -ffpe-trap is not valid: %s", arg);
 556       else if (!result)
 557         gfc_fatal_error ("Argument to -ffpe-summary is not valid: %s", arg);
 558
 559     }
 560 }
 561
 562
 563 static void
 564 gfc_handle_coarray_option (const char *arg)
 565 {
 566   if (strcmp (arg, "none") == 0)
 567     gfc_option.coarray = GFC_FCOARRAY_NONE;
 568   else if (strcmp (arg, "single") == 0)
 569     gfc_option.coarray = GFC_FCOARRAY_SINGLE;
 570   else if (strcmp (arg, "lib") == 0)
 571     gfc_option.coarray = GFC_FCOARRAY_LIB;
 572   else
 573     gfc_fatal_error ("Argument to -fcoarray is not valid: %s", arg);
 574 }
 575
 576
 577 static void
 578 gfc_handle_runtime_check_option (const char *arg)
 579 {
 580   int result, pos = 0, n;
 581   static const char * const optname[] = { "all", "bounds", "array-temps",
 582                                           "recursion", "do", "pointer",
 583                                           "mem", NULL };
 584   static const int optmask[] = { GFC_RTCHECK_ALL, GFC_RTCHECK_BOUNDS,
 585                                  GFC_RTCHECK_ARRAY_TEMPS,
 586                                  GFC_RTCHECK_RECURSION, GFC_RTCHECK_DO,
 587                                  GFC_RTCHECK_POINTER, GFC_RTCHECK_MEM,
 588                                  0 };
 589
 590   while (*arg)
 591     {
 592       while (*arg == ',')
 593         arg++;
 594
 595       while (arg[pos] && arg[pos] != ',')
 596         pos++;
 597
 598       result = 0;
 599       for (n = 0; optname[n] != NULL; n++)
 600         {
 601           if (optname[n] && strncmp (optname[n], arg, pos) == 0)
 602             {
 603               gfc_option.rtcheck |= optmask[n];
 604               arg += pos;
 605               pos = 0;
 606               result = 1;
 607               break;
 608             }
 609         }
 610       if (!result)
 611         gfc_fatal_error ("Argument to -fcheck is not valid: %s", arg);
 612     }
 613 }
 614
 615
 616 /* Handle command-line options.  Returns 0 if unrecognized, 1 if
 617    recognized and handled.  */
 618
 619 bool
 620 gfc_handle_option (size_t scode, const char *arg, int value,
 621                    int kind ATTRIBUTE_UNUSED, location_t loc ATTRIBUTE_UNUSED,
 622                    const struct cl_option_handlers *handlers ATTRIBUTE_UNUSED)
 623 {
 624   bool result = true;
 625   enum opt_code code = (enum opt_code) scode;
 626
 627   if (gfc_cpp_handle_option (scode, arg, value) == 1)
 628     return true;
 629
 630   switch (code)
 631     {
 632     default:
 633       result = false;
 634       break;
 635
 636     case OPT_Wall:
 637       handle_generated_option (&global_options, &global_options_set,
 638                                OPT_Wunused, NULL, value,
 639                                gfc_option_lang_mask (), kind, loc,
 640                                handlers, global_dc);
 641       set_Wall (value);
 642       break;
 643
 644     case OPT_Waliasing:
 645       gfc_option.warn_aliasing = value;
 646       break;
 647
 648     case OPT_Wampersand:
 649       gfc_option.warn_ampersand = value;
 650       break;
 651
 652     case OPT_Warray_temporaries:
 653       gfc_option.warn_array_temp = value;
 654       break;
 655
 656     case OPT_Wc_binding_type:
 657       gfc_option.warn_c_binding_type = value;
 658       break;
 659
 660     case OPT_Wcharacter_truncation:
 661       gfc_option.warn_character_truncation = value;
 662       break;
 663
 664     case OPT_Wcompare_reals:
 665       gfc_option.warn_compare_reals = value;
 666       break;
 667
 668     case OPT_Wconversion:
 669       gfc_option.gfc_warn_conversion = value;
 670       break;
 671
 672     case OPT_Wconversion_extra:
 673       gfc_option.warn_conversion_extra = value;
 674       break;
 675
 676     case OPT_Wextra:
 677       set_Wextra (value);
 678       break;
 679
 680     case OPT_Wfunction_elimination:
 681       gfc_option.warn_function_elimination = value;
 682       break;
 683
 684     case OPT_Wimplicit_interface:
 685       gfc_option.warn_implicit_interface = value;
 686       break;
 687
 688     case OPT_Wimplicit_procedure:
 689       gfc_option.warn_implicit_procedure = value;
 690       break;
 691
 692     case OPT_Wline_truncation:
 693       gfc_option.warn_line_truncation = value;
 694       break;
 695
 696     case OPT_Wrealloc_lhs:
 697       gfc_option.warn_realloc_lhs = value;
 698       break;
 699
 700     case OPT_Wrealloc_lhs_all:
 701       gfc_option.warn_realloc_lhs_all = value;
 702       break;
 703
 704     case OPT_Wreturn_type:
 705       warn_return_type = value;
 706       break;
 707
 708     case OPT_Wsurprising:
 709       gfc_option.warn_surprising = value;
 710       break;
 711
 712     case OPT_Wtabs:
 713       gfc_option.warn_tabs = value;
 714       break;
 715
 716     case OPT_Wtarget_lifetime:
 717       gfc_option.warn_target_lifetime = value;
 718       break;
 719
 720     case OPT_Wunderflow:
 721       gfc_option.warn_underflow = value;
 722       break;
 723
 724     case OPT_Wintrinsic_shadow:
 725       gfc_option.warn_intrinsic_shadow = value;
 726       break;
 727
 728     case OPT_Walign_commons:
 729       gfc_option.warn_align_commons = value;
 730       break;
 731
 732     case OPT_Wreal_q_constant:
 733       gfc_option.warn_real_q_constant = value;
 734       break;
 735
 736     case OPT_Wunused_dummy_argument:
 737       gfc_option.warn_unused_dummy_argument = value;
 738       break;
 739
 740     case OPT_Wzerotrip:
 741       gfc_option.warn_zerotrip = value;
 742       break;
 743
 744     case OPT_fall_intrinsics:
 745       gfc_option.flag_all_intrinsics = 1;
 746       break;
 747
 748     case OPT_fautomatic:
 749       gfc_option.flag_automatic = value;
 750       break;
 751
 752     case OPT_fallow_leading_underscore:
 753       gfc_option.flag_allow_leading_underscore = value;
 754       break;
 755
 756     case OPT_fbackslash:
 757       gfc_option.flag_backslash = value;
 758       break;
 759
 760     case OPT_fbacktrace:
 761       gfc_option.flag_backtrace = value;
 762       break;
 763
 764     case OPT_fcheck_array_temporaries:
 765       gfc_option.rtcheck |= GFC_RTCHECK_ARRAY_TEMPS;
 766       break;
 767
 768     case OPT_fcray_pointer:
 769       gfc_option.flag_cray_pointer = value;
 770       break;
 771
 772     case OPT_ff2c:
 773       gfc_option.flag_f2c = value;
 774       break;
 775
 776     case OPT_fdollar_ok:
 777       gfc_option.flag_dollar_ok = value;
 778       break;
 779
 780     case OPT_fexternal_blas:
 781       gfc_option.flag_external_blas = value;
 782       break;
 783
 784     case OPT_fblas_matmul_limit_:
 785       gfc_option.blas_matmul_limit = value;
 786       break;
 787
 788     case OPT_fd_lines_as_code:
 789       gfc_option.flag_d_lines = 1;
 790       break;
 791
 792     case OPT_fd_lines_as_comments:
 793       gfc_option.flag_d_lines = 0;
 794       break;
 795
 796     case OPT_fdump_fortran_original:
 797     case OPT_fdump_parse_tree:
 798       gfc_option.dump_fortran_original = value;
 799       break;
 800
 801     case OPT_fdump_fortran_optimized:
 802       gfc_option.dump_fortran_optimized = value;
 803       break;
 804
 805     case OPT_ffixed_form:
 806       gfc_option.source_form = FORM_FIXED;
 807       break;
 808
 809     case OPT_ffixed_line_length_none:
 810       gfc_option.fixed_line_length = 0;
 811       break;
 812
 813     case OPT_ffixed_line_length_:
 814       if (value != 0 && value < 7)
 815         gfc_fatal_error ("Fixed line length must be at least seven.");
 816       gfc_option.fixed_line_length = value;
 817       break;
 818
 819     case OPT_ffree_form:
 820       gfc_option.source_form = FORM_FREE;
 821       break;
 822
 823     case OPT_fopenmp:
 824       gfc_option.gfc_flag_openmp = value;
 825       break;
 826
 827     case OPT_fopenmp_simd:
 828       gfc_option.gfc_flag_openmp_simd = value;
 829       break;
 830
 831     case OPT_ffree_line_length_none:
 832       gfc_option.free_line_length = 0;
 833       break;
 834
 835     case OPT_ffree_line_length_:
 836       if (value != 0 && value < 4)
 837         gfc_fatal_error ("Free line length must be at least three.");
 838       gfc_option.free_line_length = value;
 839       break;
 840
 841     case OPT_funderscoring:
 842       gfc_option.flag_underscoring = value;
 843       break;
 844
 845     case OPT_fsecond_underscore:
 846       gfc_option.flag_second_underscore = value;
 847       break;
 848
 849     case OPT_static_libgfortran:
 850 #ifndef HAVE_LD_STATIC_DYNAMIC
 851       gfc_fatal_error ("-static-libgfortran is not supported in this "
 852                        "configuration");
 853 #endif
 854       break;
 855
 856     case OPT_fimplicit_none:
 857       gfc_option.flag_implicit_none = value;
 858       break;
 859
 860     case OPT_fintrinsic_modules_path:
 861     case OPT_fintrinsic_modules_path_:
 862
 863       /* This is needed because omp_lib.h is in a directory together
 864          with intrinsic modules.  Do no warn because during testing
 865          without an installed compiler, we would get lots of bogus
 866          warnings for a missing include directory.  */
 867       gfc_add_include_path (arg, false, false, false);
 868
 869       gfc_add_intrinsic_modules_path (arg);
 870       break;
 871
 872     case OPT_fmax_array_constructor_:
 873       gfc_option.flag_max_array_constructor = value > 65535 ? value : 65535;
 874       break;
 875
 876     case OPT_fmax_stack_var_size_:
 877       gfc_option.flag_max_stack_var_size = value;
 878       break;
 879
 880     case OPT_fstack_arrays:
 881       gfc_option.flag_stack_arrays = value;
 882       break;
 883
 884     case OPT_fmodule_private:
 885       gfc_option.flag_module_private = value;
 886       break;
 887
 888     case OPT_frange_check:
 889       gfc_option.flag_range_check = value;
 890       break;
 891
 892     case OPT_fpack_derived:
 893       gfc_option.flag_pack_derived = value;
 894       break;
 895
 896     case OPT_frepack_arrays:
 897       gfc_option.flag_repack_arrays = value;
 898       break;
 899
 900     case OPT_fpreprocessed:
 901       gfc_option.flag_preprocessed = value;
 902       break;
 903
 904     case OPT_fmax_identifier_length_:
 905       if (value > GFC_MAX_SYMBOL_LEN)
 906         gfc_fatal_error ("Maximum supported identifier length is %d",
 907                          GFC_MAX_SYMBOL_LEN);
 908       gfc_option.max_identifier_length = value;
 909       break;
 910
 911     case OPT_fdefault_integer_8:
 912       gfc_option.flag_default_integer = value;
 913       break;
 914
 915     case OPT_fdefault_real_8:
 916       gfc_option.flag_default_real = value;
 917       break;
 918
 919     case OPT_fdefault_double_8:
 920       gfc_option.flag_default_double = value;
 921       break;
 922
 923     case OPT_finteger_4_integer_8:
 924       gfc_option.flag_integer4_kind = 8;
 925       break;
 926
 927     case OPT_freal_4_real_8:
 928       gfc_option.flag_real4_kind = 8;
 929       break;
 930
 931     case OPT_freal_4_real_10:
 932       gfc_option.flag_real4_kind = 10;
 933       break;
 934
 935     case OPT_freal_4_real_16:
 936       gfc_option.flag_real4_kind = 16;
 937       break;
 938
 939     case OPT_freal_8_real_4:
 940       gfc_option.flag_real8_kind = 4;
 941       break;
 942
 943     case OPT_freal_8_real_10:
 944       gfc_option.flag_real8_kind = 10;
 945       break;
 946
 947     case OPT_freal_8_real_16:
 948       gfc_option.flag_real8_kind = 16;
 949       break;
 950
 951     case OPT_finit_local_zero:
 952       gfc_option.flag_init_integer = GFC_INIT_INTEGER_ON;
 953       gfc_option.flag_init_integer_value = 0;
 954       gfc_option.flag_init_real = GFC_INIT_REAL_ZERO;
 955       gfc_option.flag_init_logical = GFC_INIT_LOGICAL_FALSE;
 956       gfc_option.flag_init_character = GFC_INIT_CHARACTER_ON;
 957       gfc_option.flag_init_character_value = (char)0;
 958       break;
 959
 960     case OPT_finit_logical_:
 961       if (!strcasecmp (arg, "false"))
 962         gfc_option.flag_init_logical = GFC_INIT_LOGICAL_FALSE;
 963       else if (!strcasecmp (arg, "true"))
 964         gfc_option.flag_init_logical = GFC_INIT_LOGICAL_TRUE;
 965       else
 966         gfc_fatal_error ("Unrecognized option to -finit-logical: %s",
 967                          arg);
 968       break;
 969
 970     case OPT_finit_real_:
 971       if (!strcasecmp (arg, "zero"))
 972         gfc_option.flag_init_real = GFC_INIT_REAL_ZERO;
 973       else if (!strcasecmp (arg, "nan"))
 974         gfc_option.flag_init_real = GFC_INIT_REAL_NAN;
 975       else if (!strcasecmp (arg, "snan"))
 976         gfc_option.flag_init_real = GFC_INIT_REAL_SNAN;
 977       else if (!strcasecmp (arg, "inf"))
 978         gfc_option.flag_init_real = GFC_INIT_REAL_INF;
 979       else if (!strcasecmp (arg, "-inf"))
 980         gfc_option.flag_init_real = GFC_INIT_REAL_NEG_INF;
 981       else
 982         gfc_fatal_error ("Unrecognized option to -finit-real: %s",
 983                          arg);
 984       break;
 985
 986     case OPT_finit_integer_:
 987       gfc_option.flag_init_integer = GFC_INIT_INTEGER_ON;
 988       gfc_option.flag_init_integer_value = atoi (arg);
 989       break;
 990
 991     case OPT_finit_character_:
 992       if (value >= 0 && value <= 127)
 993         {
 994           gfc_option.flag_init_character = GFC_INIT_CHARACTER_ON;
 995           gfc_option.flag_init_character_value = (char)value;
 996         }
 997       else
 998         gfc_fatal_error ("The value of n in -finit-character=n must be "
 999                          "between 0 and 127");
1000       break;
1001
1002     case OPT_I:
1003       gfc_add_include_path (arg, true, false, true);
1004       break;
1005
1006     case OPT_J:
1007       gfc_handle_module_path_options (arg);
1008       break;
1009
1010     case OPT_fsign_zero:
1011       gfc_option.flag_sign_zero = value;
1012       break;
1013
1014     case OPT_ffpe_trap_:
1015       gfc_handle_fpe_option (arg, true);
1016       break;
1017
1018     case OPT_ffpe_summary_:
1019       gfc_handle_fpe_option (arg, false);
1020       break;
1021
1022     case OPT_std_f95:
1023       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F95 | GFC_STD_F77
1024                              | GFC_STD_F2008_OBS;
1025       gfc_option.warn_std = GFC_STD_F95_OBS;
1026       gfc_option.max_continue_fixed = 19;
1027       gfc_option.max_continue_free = 39;
1028       gfc_option.max_identifier_length = 31;
1029       gfc_option.warn_ampersand = 1;
1030       gfc_option.warn_tabs = 0;
1031       break;
1032
1033     case OPT_std_f2003:
1034       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F77
1035         | GFC_STD_F2003 | GFC_STD_F95 | GFC_STD_F2008_OBS;
1036       gfc_option.warn_std = GFC_STD_F95_OBS;
1037       gfc_option.max_identifier_length = 63;
1038       gfc_option.warn_ampersand = 1;
1039       gfc_option.warn_tabs = 0;
1040       break;
1041
1042     case OPT_std_f2008:
1043       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F77
1044         | GFC_STD_F2003 | GFC_STD_F95 | GFC_STD_F2008 | GFC_STD_F2008_OBS;
1045       gfc_option.warn_std = GFC_STD_F95_OBS | GFC_STD_F2008_OBS;
1046       gfc_option.max_identifier_length = 63;
1047       gfc_option.warn_ampersand = 1;
1048       gfc_option.warn_tabs = 0;
1049       break;
1050
1051     case OPT_std_f2008ts:
1052       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F77
1053         | GFC_STD_F2003 | GFC_STD_F95 | GFC_STD_F2008 | GFC_STD_F2008_OBS
1054         | GFC_STD_F2008_TS;
1055       gfc_option.warn_std = GFC_STD_F95_OBS | GFC_STD_F2008_OBS;
1056       gfc_option.max_identifier_length = 63;
1057       gfc_option.warn_ampersand = 1;
1058       gfc_option.warn_tabs = 0;
1059       break;
1060
1061     case OPT_std_gnu:
1062       set_default_std_flags ();
1063       break;
1064
1065     case OPT_std_legacy:
1066       set_default_std_flags ();
1067       gfc_option.warn_std = 0;
1068       break;
1069
1070     case OPT_Wintrinsics_std:
1071       gfc_option.warn_intrinsics_std = value;
1072       break;
1073
1074     case OPT_fshort_enums:
1075       /* Handled in language-independent code.  */
1076       break;
1077
1078     case OPT_fconvert_little_endian:
1079       gfc_option.convert = GFC_CONVERT_LITTLE;
1080       break;
1081
1082     case OPT_fconvert_big_endian:
1083       gfc_option.convert = GFC_CONVERT_BIG;
1084       break;
1085
1086     case OPT_fconvert_native:
1087       gfc_option.convert = GFC_CONVERT_NATIVE;
1088       break;
1089
1090     case OPT_fconvert_swap:
1091       gfc_option.convert = GFC_CONVERT_SWAP;
1092       break;
1093
1094     case OPT_frecord_marker_4:
1095       gfc_option.record_marker = 4;
1096       break;
1097
1098     case OPT_frecord_marker_8:
1099       gfc_option.record_marker = 8;
1100       break;
1101
1102     case OPT_fmax_subrecord_length_:
1103       if (value > MAX_SUBRECORD_LENGTH)
1104         gfc_fatal_error ("Maximum subrecord length cannot exceed %d",
1105                          MAX_SUBRECORD_LENGTH);
1106
1107       gfc_option.max_subrecord_length = value;
1108       break;
1109
1110     case OPT_frecursive:
1111       gfc_option.flag_recursive = value;
1112       break;
1113
1114     case OPT_falign_commons:
1115       gfc_option.flag_align_commons = value;
1116       break;
1117
1118     case  OPT_faggressive_function_elimination:
1119       gfc_option.flag_aggressive_function_elimination = value;
1120       break;
1121
1122     case OPT_ffrontend_optimize:
1123       gfc_option.flag_frontend_optimize = value;
1124       break;
1125
1126     case OPT_fprotect_parens:
1127       gfc_option.flag_protect_parens = value;
1128       break;
1129
1130     case OPT_frealloc_lhs:
1131       gfc_option.flag_realloc_lhs = value;
1132       break;
1133
1134     case OPT_fcheck_:
1135       gfc_handle_runtime_check_option (arg);
1136       break;
1137
1138     case OPT_fcoarray_:
1139       gfc_handle_coarray_option (arg);
1140       break;
1141     }
1142
1143   Fortran_handle_option_auto (&global_options, &global_options_set,
1144                               scode, arg, value,
1145                               gfc_option_lang_mask (), kind,
1146                               loc, handlers, global_dc);
1147   return result;
1148 }
1149
1150
1151 /* Return a string with the options passed to the compiler; used for
1152    Fortran's compiler_options() intrinsic.  */
1153
1154 char *
1155 gfc_get_option_string (void)
1156 {
1157   unsigned j;
1158   size_t len, pos;
1159   char *result;
1160
1161   /* Allocate and return a one-character string with '\0'.  */
1162   if (!save_decoded_options_count)
1163     return XCNEWVEC (char, 1);
1164
1165   /* Determine required string length.  */
1166
1167   len = 0;
1168   for (j = 1; j < save_decoded_options_count; j++)
1169     {
1170       switch (save_decoded_options[j].opt_index)
1171         {
1172         case OPT_o:
1173         case OPT_d:
1174         case OPT_dumpbase:
1175         case OPT_dumpdir:
1176         case OPT_auxbase:
1177         case OPT_quiet:
1178         case OPT_version:
1179         case OPT_fintrinsic_modules_path:
1180         case OPT_fintrinsic_modules_path_:
1181           /* Ignore these.  */
1182           break;
1183         default:
1184           /* Ignore file names. */
1185           if (save_decoded_options[j].orig_option_with_args_text[0] == '-')
1186             len += 1
1187                  + strlen (save_decoded_options[j].orig_option_with_args_text);
1188         }
1189     }
1190
1191   result = XCNEWVEC (char, len);
1192
1193   pos = 0;
1194   for (j = 1; j < save_decoded_options_count; j++)
1195     {
1196       switch (save_decoded_options[j].opt_index)
1197         {
1198         case OPT_o:
1199         case OPT_d:
1200         case OPT_dumpbase:
1201         case OPT_dumpdir:
1202         case OPT_auxbase:
1203         case OPT_quiet:
1204         case OPT_version:
1205         case OPT_fintrinsic_modules_path:
1206         case OPT_fintrinsic_modules_path_:
1207           /* Ignore these.  */
1208           continue;
1209
1210         case OPT_cpp_:
1211           /* Use "-cpp" rather than "-cpp=<temporary file>".  */
1212           len = 4;
1213           break;
1214
1215         default:
1216           /* Ignore file names. */
1217           if (save_decoded_options[j].orig_option_with_args_text[0] != '-')
1218             continue;
1219
1220           len = strlen (save_decoded_options[j].orig_option_with_args_text);
1221         }
1222
1223       memcpy (&result[pos], save_decoded_options[j].orig_option_with_args_text, len);
1224       pos += len;
1225       result[pos++] = ' ';
1226     }
1227
1228   result[--pos] = '\0';
1229   return result;
1230 }