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.fixed_line_length = 72;
  85   gfc_option.free_line_length = 132;
  86   gfc_option.max_continue_fixed = 255;
  87   gfc_option.max_continue_free = 255;
  88   gfc_option.max_identifier_length = GFC_MAX_SYMBOL_LEN;
  89   gfc_option.max_subrecord_length = 0;
  90   gfc_option.flag_max_array_constructor = 65535;
  91   gfc_option.convert = GFC_CONVERT_NATIVE;
  92   gfc_option.record_marker = 0;
  93   gfc_option.dump_fortran_original = 0;
  94   gfc_option.dump_fortran_optimized = 0;
  95
  96   gfc_option.warn_aliasing = 0;
  97   gfc_option.warn_ampersand = 0;
  98   gfc_option.warn_character_truncation = 0;
  99   gfc_option.warn_array_temp = 0;
 100   gfc_option.warn_c_binding_type = 0;
 101   gfc_option.gfc_warn_conversion = 0;
 102   gfc_option.warn_conversion_extra = 0;
 103   gfc_option.warn_function_elimination = 0;
 104   gfc_option.warn_implicit_interface = 0;
 105   gfc_option.warn_line_truncation = 0;
 106   gfc_option.warn_surprising = 0;
 107   gfc_option.warn_tabs = 1;
 108   gfc_option.warn_underflow = 1;
 109   gfc_option.warn_intrinsic_shadow = 0;
 110   gfc_option.warn_intrinsics_std = 0;
 111   gfc_option.warn_align_commons = 1;
 112   gfc_option.warn_real_q_constant = 0;
 113   gfc_option.warn_unused_dummy_argument = 0;
 114   gfc_option.warn_zerotrip = 0;
 115   gfc_option.warn_realloc_lhs = 0;
 116   gfc_option.warn_realloc_lhs_all = 0;
 117   gfc_option.warn_compare_reals = 0;
 118   gfc_option.warn_target_lifetime = 0;
 119   gfc_option.max_errors = 25;
 120
 121   gfc_option.flag_all_intrinsics = 0;
 122   gfc_option.flag_default_double = 0;
 123   gfc_option.flag_default_integer = 0;
 124   gfc_option.flag_default_real = 0;
 125   gfc_option.flag_integer4_kind = 0;
 126   gfc_option.flag_real4_kind = 0;
 127   gfc_option.flag_real8_kind = 0;
 128   gfc_option.flag_dollar_ok = 0;
 129   gfc_option.flag_underscoring = 1;
 130   gfc_option.flag_f2c = 0;
 131   gfc_option.flag_second_underscore = -1;
 132   gfc_option.flag_implicit_none = 0;
 133
 134   /* Default value of flag_max_stack_var_size is set in gfc_post_options.  */
 135   gfc_option.flag_max_stack_var_size = -2;
 136   gfc_option.flag_stack_arrays = -1;
 137
 138   gfc_option.flag_range_check = 1;
 139   gfc_option.flag_pack_derived = 0;
 140   gfc_option.flag_repack_arrays = 0;
 141   gfc_option.flag_preprocessed = 0;
 142   gfc_option.flag_automatic = 1;
 143   gfc_option.flag_backslash = 0;
 144   gfc_option.flag_module_private = 0;
 145   gfc_option.flag_backtrace = 1;
 146   gfc_option.flag_allow_leading_underscore = 0;
 147   gfc_option.flag_external_blas = 0;
 148   gfc_option.blas_matmul_limit = 30;
 149   gfc_option.flag_cray_pointer = 0;
 150   gfc_option.flag_d_lines = -1;
 151   gfc_option.gfc_flag_openmp = 0;
 152   gfc_option.flag_sign_zero = 1;
 153   gfc_option.flag_recursive = 0;
 154   gfc_option.flag_init_integer = GFC_INIT_INTEGER_OFF;
 155   gfc_option.flag_init_integer_value = 0;
 156   gfc_option.flag_init_real = GFC_INIT_REAL_OFF;
 157   gfc_option.flag_init_logical = GFC_INIT_LOGICAL_OFF;
 158   gfc_option.flag_init_character = GFC_INIT_CHARACTER_OFF;
 159   gfc_option.flag_init_character_value = (char)0;
 160   gfc_option.flag_align_commons = 1;
 161   gfc_option.flag_protect_parens = -1;
 162   gfc_option.flag_realloc_lhs = -1;
 163   gfc_option.flag_aggressive_function_elimination = 0;
 164   gfc_option.flag_frontend_optimize = -1;
 165
 166   gfc_option.fpe = 0;
 167   /* All except GFC_FPE_INEXACT.  */
 168   gfc_option.fpe_summary = GFC_FPE_INVALID | GFC_FPE_DENORMAL
 169                            | GFC_FPE_ZERO | GFC_FPE_OVERFLOW
 170                            | GFC_FPE_UNDERFLOW;
 171   gfc_option.rtcheck = 0;
 172   gfc_option.coarray = GFC_FCOARRAY_NONE;
 173
 174   /* ??? Wmissing-include-dirs is disabled by default in C/C++ but
 175      enabled by default in Fortran.  Ideally, we should express this
 176      in .opt, but that is not supported yet.  */
 177   if (!global_options_set.x_cpp_warn_missing_include_dirs)
 178     global_options.x_cpp_warn_missing_include_dirs = 1;;
 179
 180   set_default_std_flags ();
 181
 182   /* Initialize cpp-related options.  */
 183   gfc_cpp_init_options (decoded_options_count, decoded_options);
 184   gfc_diagnostics_init ();
 185 }
 186
 187
 188 /* Determine the source form from the filename extension.  We assume
 189    case insensitivity.  */
 190
 191 static gfc_source_form
 192 form_from_filename (const char *filename)
 193 {
 194   static const struct
 195   {
 196     const char *extension;
 197     gfc_source_form form;
 198   }
 199   exttype[] =
 200   {
 201     {
 202     ".f90", FORM_FREE}
 203     ,
 204     {
 205     ".f95", FORM_FREE}
 206     ,
 207     {
 208     ".f03", FORM_FREE}
 209     ,
 210     {
 211     ".f08", FORM_FREE}
 212     ,
 213     {
 214     ".f", FORM_FIXED}
 215     ,
 216     {
 217     ".for", FORM_FIXED}
 218     ,
 219     {
 220     ".ftn", FORM_FIXED}
 221     ,
 222     {
 223     "", FORM_UNKNOWN}
 224   };            /* sentinel value */
 225
 226   gfc_source_form f_form;
 227   const char *fileext;
 228   int i;
 229
 230   /* Find end of file name.  Note, filename is either a NULL pointer or
 231      a NUL terminated string.  */
 232   i = 0;
 233   while (filename[i] != '\0')
 234     i++;
 235
 236   /* Find last period.  */
 237   while (i >= 0 && (filename[i] != '.'))
 238     i--;
 239
 240   /* Did we see a file extension?  */
 241   if (i < 0)
 242     return FORM_UNKNOWN; /* Nope  */
 243
 244   /* Get file extension and compare it to others.  */
 245   fileext = &(filename[i]);
 246
 247   i = -1;
 248   f_form = FORM_UNKNOWN;
 249   do
 250     {
 251       i++;
 252       if (strcasecmp (fileext, exttype[i].extension) == 0)
 253         {
 254           f_form = exttype[i].form;
 255           break;
 256         }
 257     }
 258   while (exttype[i].form != FORM_UNKNOWN);
 259
 260   return f_form;
 261 }
 262
 263
 264 /* Finalize commandline options.  */
 265
 266 bool
 267 gfc_post_options (const char **pfilename)
 268 {
 269   const char *filename = *pfilename, *canon_source_file = NULL;
 270   char *source_path;
 271   int i;
 272
 273   /* Excess precision other than "fast" requires front-end
 274      support.  */
 275   if (flag_excess_precision_cmdline == EXCESS_PRECISION_STANDARD
 276       && TARGET_FLT_EVAL_METHOD_NON_DEFAULT)
 277     sorry ("-fexcess-precision=standard for Fortran");
 278   flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
 279
 280   /* Fortran allows associative math - but we cannot reassociate if
 281      we want traps or signed zeros. Cf. also flag_protect_parens.  */
 282   if (flag_associative_math == -1)
 283     flag_associative_math = (!flag_trapping_math && !flag_signed_zeros);
 284
 285   if (gfc_option.flag_protect_parens == -1)
 286     gfc_option.flag_protect_parens = !optimize_fast;
 287
 288   if (gfc_option.flag_stack_arrays == -1)
 289     gfc_option.flag_stack_arrays = optimize_fast;
 290
 291   /* By default, disable (re)allocation during assignment for -std=f95,
 292      and enable it for F2003/F2008/GNU/Legacy.  */
 293   if (gfc_option.flag_realloc_lhs == -1)
 294     {
 295       if (gfc_option.allow_std & GFC_STD_F2003)
 296         gfc_option.flag_realloc_lhs = 1;
 297       else
 298         gfc_option.flag_realloc_lhs = 0;
 299     }
 300
 301   /* -fbounds-check is equivalent to -fcheck=bounds */
 302   if (flag_bounds_check)
 303     gfc_option.rtcheck |= GFC_RTCHECK_BOUNDS;
 304
 305   if (flag_compare_debug)
 306     gfc_option.dump_fortran_original = 0;
 307
 308   /* Make -fmax-errors visible to gfortran's diagnostic machinery.  */
 309   if (global_options_set.x_flag_max_errors)
 310     gfc_option.max_errors = flag_max_errors;
 311
 312   /* Verify the input file name.  */
 313   if (!filename || strcmp (filename, "-") == 0)
 314     {
 315       filename = "";
 316     }
 317
 318   if (gfc_option.flag_preprocessed)
 319     {
 320       /* For preprocessed files, if the first tokens are of the form # NUM.
 321          handle the directives so we know the original file name.  */
 322       gfc_source_file = gfc_read_orig_filename (filename, &canon_source_file);
 323       if (gfc_source_file == NULL)
 324         gfc_source_file = filename;
 325       else
 326         *pfilename = gfc_source_file;
 327     }
 328   else
 329     gfc_source_file = filename;
 330
 331   if (canon_source_file == NULL)
 332     canon_source_file = gfc_source_file;
 333
 334   /* Adds the path where the source file is to the list of include files.  */
 335
 336   i = strlen (canon_source_file);
 337   while (i > 0 && !IS_DIR_SEPARATOR (canon_source_file[i]))
 338     i--;
 339
 340   if (i != 0)
 341     {
 342       source_path = (char *) alloca (i + 1);
 343       memcpy (source_path, canon_source_file, i);
 344       source_path[i] = 0;
 345       gfc_add_include_path (source_path, true, true, true);
 346     }
 347   else
 348     gfc_add_include_path (".", true, true, true);
 349
 350   if (canon_source_file != gfc_source_file)
 351     free (CONST_CAST (char *, canon_source_file));
 352
 353   /* Decide which form the file will be read in as.  */
 354
 355   if (gfc_option.source_form != FORM_UNKNOWN)
 356     gfc_current_form = gfc_option.source_form;
 357   else
 358     {
 359       gfc_current_form = form_from_filename (filename);
 360
 361       if (gfc_current_form == FORM_UNKNOWN)
 362         {
 363           gfc_current_form = FORM_FREE;
 364           gfc_warning_now_2 ("Reading file %qs as free form",
 365                              (filename[0] == '\0') ? "<stdin>" : filename);
 366         }
 367     }
 368
 369   /* If the user specified -fd-lines-as-{code|comments} verify that we're
 370      in fixed form.  */
 371   if (gfc_current_form == FORM_FREE)
 372     {
 373       if (gfc_option.flag_d_lines == 0)
 374         gfc_warning_now_2 ("%<-fd-lines-as-comments%> has no effect "
 375                            "in free form");
 376       else if (gfc_option.flag_d_lines == 1)
 377         gfc_warning_now_2 ("%<-fd-lines-as-code%> has no effect in free form");
 378     }
 379
 380   /* If -pedantic, warn about the use of GNU extensions.  */
 381   if (pedantic && (gfc_option.allow_std & GFC_STD_GNU) != 0)
 382     gfc_option.warn_std |= GFC_STD_GNU;
 383   /* -std=legacy -pedantic is effectively -std=gnu.  */
 384   if (pedantic && (gfc_option.allow_std & GFC_STD_LEGACY) != 0)
 385     gfc_option.warn_std |= GFC_STD_F95_OBS | GFC_STD_F95_DEL | GFC_STD_LEGACY;
 386
 387   /* If the user didn't explicitly specify -f(no)-second-underscore we
 388      use it if we're trying to be compatible with f2c, and not
 389      otherwise.  */
 390   if (gfc_option.flag_second_underscore == -1)
 391     gfc_option.flag_second_underscore = gfc_option.flag_f2c;
 392
 393   if (!gfc_option.flag_automatic && gfc_option.flag_max_stack_var_size != -2
 394       && gfc_option.flag_max_stack_var_size != 0)
 395     gfc_warning_now_2 ("Flag %<-fno-automatic%> overwrites %<-fmax-stack-var-size=%d%>",
 396                        gfc_option.flag_max_stack_var_size);
 397   else if (!gfc_option.flag_automatic && gfc_option.flag_recursive)
 398     gfc_warning_now_2 ("Flag %<-fno-automatic%> overwrites %<-frecursive%>");
 399   else if (!gfc_option.flag_automatic && gfc_option.gfc_flag_openmp)
 400     gfc_warning_now_2 ("Flag %<-fno-automatic%> overwrites %<-frecursive%> implied by "
 401                        "%<-fopenmp%>");
 402   else if (gfc_option.flag_max_stack_var_size != -2
 403            && gfc_option.flag_recursive)
 404     gfc_warning_now_2 ("Flag %<-frecursive%> overwrites %<-fmax-stack-var-size=%d%>",
 405                        gfc_option.flag_max_stack_var_size);
 406   else if (gfc_option.flag_max_stack_var_size != -2
 407            && gfc_option.gfc_flag_openmp)
 408     gfc_warning_now_2 ("Flag %<-fmax-stack-var-size=%d%> overwrites %<-frecursive%> "
 409                        "implied by %<-fopenmp%>",
 410                      gfc_option.flag_max_stack_var_size);
 411
 412   /* Implement -frecursive as -fmax-stack-var-size=-1.  */
 413   if (gfc_option.flag_recursive)
 414     gfc_option.flag_max_stack_var_size = -1;
 415
 416   /* Implied -frecursive; implemented as -fmax-stack-var-size=-1.  */
 417   if (gfc_option.flag_max_stack_var_size == -2 && gfc_option.gfc_flag_openmp
 418       && gfc_option.flag_automatic)
 419     {
 420       gfc_option.flag_recursive = 1;
 421       gfc_option.flag_max_stack_var_size = -1;
 422     }
 423
 424   /* Set default.  */
 425   if (gfc_option.flag_max_stack_var_size == -2)
 426     gfc_option.flag_max_stack_var_size = 32768;
 427
 428   /* Implement -fno-automatic as -fmax-stack-var-size=0.  */
 429   if (!gfc_option.flag_automatic)
 430     gfc_option.flag_max_stack_var_size = 0;
 431
 432   if (pedantic)
 433     {
 434       gfc_option.warn_ampersand = 1;
 435       gfc_option.warn_tabs = 0;
 436     }
 437
 438   /* Optimization implies front end optimization, unless the user
 439      specified it directly.  */
 440
 441   if (gfc_option.flag_frontend_optimize == -1)
 442     gfc_option.flag_frontend_optimize = optimize;
 443
 444   if (gfc_option.warn_realloc_lhs_all)
 445     gfc_option.warn_realloc_lhs = 1;
 446
 447   gfc_cpp_post_options ();
 448
 449   return gfc_cpp_preprocess_only ();
 450 }
 451
 452
 453 /* Set the options for -Wall.  */
 454
 455 static void
 456 set_Wall (int setting)
 457 {
 458   gfc_option.warn_aliasing = setting;
 459   gfc_option.warn_ampersand = setting;
 460   gfc_option.warn_c_binding_type = setting;
 461   gfc_option.gfc_warn_conversion = setting;
 462   gfc_option.warn_line_truncation = setting;
 463   gfc_option.warn_surprising = setting;
 464   gfc_option.warn_tabs = !setting;
 465   gfc_option.warn_underflow = setting;
 466   gfc_option.warn_intrinsic_shadow = setting;
 467   gfc_option.warn_intrinsics_std = setting;
 468   gfc_option.warn_character_truncation = setting;
 469   gfc_option.warn_real_q_constant = setting;
 470   gfc_option.warn_unused_dummy_argument = setting;
 471   gfc_option.warn_target_lifetime = setting;
 472   gfc_option.warn_zerotrip = setting;
 473
 474   warn_return_type = setting;
 475   warn_uninitialized = setting;
 476   warn_maybe_uninitialized = setting;
 477 }
 478
 479 /* Set the options for -Wextra.  */
 480
 481 static void
 482 set_Wextra (int setting)
 483 {
 484   gfc_option.warn_compare_reals = setting;
 485 }
 486
 487 static void
 488 gfc_handle_module_path_options (const char *arg)
 489 {
 490
 491   if (gfc_option.module_dir != NULL)
 492     gfc_fatal_error ("gfortran: Only one %<-J%> option allowed");
 493
 494   gfc_option.module_dir = XCNEWVEC (char, strlen (arg) + 2);
 495   strcpy (gfc_option.module_dir, arg);
 496
 497   gfc_add_include_path (gfc_option.module_dir, true, false, true);
 498
 499   strcat (gfc_option.module_dir, "/");
 500 }
 501
 502
 503 /* Handle options -ffpe-trap= and -ffpe-summary=.  */
 504
 505 static void
 506 gfc_handle_fpe_option (const char *arg, bool trap)
 507 {
 508   int result, pos = 0, n;
 509   /* precision is a backwards compatibility alias for inexact.  */
 510   static const char * const exception[] = { "invalid", "denormal", "zero",
 511                                             "overflow", "underflow",
 512                                             "inexact", "precision", NULL };
 513   static const int opt_exception[] = { GFC_FPE_INVALID, GFC_FPE_DENORMAL,
 514                                        GFC_FPE_ZERO, GFC_FPE_OVERFLOW,
 515                                        GFC_FPE_UNDERFLOW, GFC_FPE_INEXACT,
 516                                        GFC_FPE_INEXACT,
 517                                        0 };
 518
 519   /* As the default for -ffpe-summary= is nonzero, set it to 0.  */
 520   if (!trap)
 521     gfc_option.fpe_summary = 0;
 522
 523   while (*arg)
 524     {
 525       while (*arg == ',')
 526         arg++;
 527
 528       while (arg[pos] && arg[pos] != ',')
 529         pos++;
 530
 531       result = 0;
 532       if (!trap && strncmp ("none", arg, pos) == 0)
 533         {
 534           gfc_option.fpe_summary = 0;
 535           arg += pos;
 536           pos = 0;
 537           continue;
 538         }
 539       else if (!trap && strncmp ("all", arg, pos) == 0)
 540         {
 541           gfc_option.fpe_summary = GFC_FPE_INVALID | GFC_FPE_DENORMAL
 542                                    | GFC_FPE_ZERO | GFC_FPE_OVERFLOW
 543                                    | GFC_FPE_UNDERFLOW | GFC_FPE_INEXACT;
 544           arg += pos;
 545           pos = 0;
 546           continue;
 547         }
 548       else
 549         for (n = 0; exception[n] != NULL; n++)
 550           {
 551           if (exception[n] && strncmp (exception[n], arg, pos) == 0)
 552             {
 553               if (trap)
 554                 gfc_option.fpe |= opt_exception[n];
 555               else
 556                 gfc_option.fpe_summary |= opt_exception[n];
 557               arg += pos;
 558               pos = 0;
 559               result = 1;
 560               break;
 561             }
 562           }
 563       if (!result && !trap)
 564         gfc_fatal_error ("Argument to %<-ffpe-trap%> is not valid: %s", arg);
 565       else if (!result)
 566         gfc_fatal_error ("Argument to %<-ffpe-summary%> is not valid: %s", arg);
 567
 568     }
 569 }
 570
 571
 572 static void
 573 gfc_handle_coarray_option (const char *arg)
 574 {
 575   if (strcmp (arg, "none") == 0)
 576     gfc_option.coarray = GFC_FCOARRAY_NONE;
 577   else if (strcmp (arg, "single") == 0)
 578     gfc_option.coarray = GFC_FCOARRAY_SINGLE;
 579   else if (strcmp (arg, "lib") == 0)
 580     gfc_option.coarray = GFC_FCOARRAY_LIB;
 581   else
 582     gfc_fatal_error ("Argument to %<-fcoarray%> is not valid: %s", arg);
 583 }
 584
 585
 586 static void
 587 gfc_handle_runtime_check_option (const char *arg)
 588 {
 589   int result, pos = 0, n;
 590   static const char * const optname[] = { "all", "bounds", "array-temps",
 591                                           "recursion", "do", "pointer",
 592                                           "mem", NULL };
 593   static const int optmask[] = { GFC_RTCHECK_ALL, GFC_RTCHECK_BOUNDS,
 594                                  GFC_RTCHECK_ARRAY_TEMPS,
 595                                  GFC_RTCHECK_RECURSION, GFC_RTCHECK_DO,
 596                                  GFC_RTCHECK_POINTER, GFC_RTCHECK_MEM,
 597                                  0 };
 598
 599   while (*arg)
 600     {
 601       while (*arg == ',')
 602         arg++;
 603
 604       while (arg[pos] && arg[pos] != ',')
 605         pos++;
 606
 607       result = 0;
 608       for (n = 0; optname[n] != NULL; n++)
 609         {
 610           if (optname[n] && strncmp (optname[n], arg, pos) == 0)
 611             {
 612               gfc_option.rtcheck |= optmask[n];
 613               arg += pos;
 614               pos = 0;
 615               result = 1;
 616               break;
 617             }
 618         }
 619       if (!result)
 620         gfc_fatal_error ("Argument to %<-fcheck%> is not valid: %s", arg);
 621     }
 622 }
 623
 624
 625 /* Handle command-line options.  Returns 0 if unrecognized, 1 if
 626    recognized and handled.  */
 627
 628 bool
 629 gfc_handle_option (size_t scode, const char *arg, int value,
 630                    int kind ATTRIBUTE_UNUSED, location_t loc ATTRIBUTE_UNUSED,
 631                    const struct cl_option_handlers *handlers ATTRIBUTE_UNUSED)
 632 {
 633   bool result = true;
 634   enum opt_code code = (enum opt_code) scode;
 635
 636   if (gfc_cpp_handle_option (scode, arg, value) == 1)
 637     return true;
 638
 639   switch (code)
 640     {
 641     default:
 642       if (cl_options[code].flags & gfc_option_lang_mask ())
 643         break;
 644       result = false;
 645       break;
 646
 647     case OPT_Wall:
 648       handle_generated_option (&global_options, &global_options_set,
 649                                OPT_Wunused, NULL, value,
 650                                gfc_option_lang_mask (), kind, loc,
 651                                handlers, global_dc);
 652       set_Wall (value);
 653       break;
 654
 655     case OPT_Waliasing:
 656       gfc_option.warn_aliasing = value;
 657       break;
 658
 659     case OPT_Wampersand:
 660       gfc_option.warn_ampersand = value;
 661       break;
 662
 663     case OPT_Warray_temporaries:
 664       gfc_option.warn_array_temp = value;
 665       break;
 666
 667     case OPT_Wc_binding_type:
 668       gfc_option.warn_c_binding_type = value;
 669       break;
 670
 671     case OPT_Wcharacter_truncation:
 672       gfc_option.warn_character_truncation = value;
 673       break;
 674
 675     case OPT_Wcompare_reals:
 676       gfc_option.warn_compare_reals = value;
 677       break;
 678
 679     case OPT_Wconversion:
 680       gfc_option.gfc_warn_conversion = value;
 681       break;
 682
 683     case OPT_Wconversion_extra:
 684       gfc_option.warn_conversion_extra = value;
 685       break;
 686
 687     case OPT_Wextra:
 688       set_Wextra (value);
 689       break;
 690
 691     case OPT_Wfunction_elimination:
 692       gfc_option.warn_function_elimination = value;
 693       break;
 694
 695     case OPT_Wimplicit_interface:
 696       gfc_option.warn_implicit_interface = value;
 697       break;
 698
 699     case OPT_Wimplicit_procedure:
 700       gfc_option.warn_implicit_procedure = value;
 701       break;
 702
 703     case OPT_Wline_truncation:
 704       gfc_option.warn_line_truncation = value;
 705       break;
 706
 707     case OPT_Wrealloc_lhs:
 708       gfc_option.warn_realloc_lhs = value;
 709       break;
 710
 711     case OPT_Wrealloc_lhs_all:
 712       gfc_option.warn_realloc_lhs_all = value;
 713       break;
 714
 715     case OPT_Wreturn_type:
 716       warn_return_type = value;
 717       break;
 718
 719     case OPT_Wsurprising:
 720       gfc_option.warn_surprising = value;
 721       break;
 722
 723     case OPT_Wtabs:
 724       gfc_option.warn_tabs = value;
 725       break;
 726
 727     case OPT_Wtarget_lifetime:
 728       gfc_option.warn_target_lifetime = value;
 729       break;
 730
 731     case OPT_Wunderflow:
 732       gfc_option.warn_underflow = value;
 733       break;
 734
 735     case OPT_Wintrinsic_shadow:
 736       gfc_option.warn_intrinsic_shadow = value;
 737       break;
 738
 739     case OPT_Walign_commons:
 740       gfc_option.warn_align_commons = value;
 741       break;
 742
 743     case OPT_Wreal_q_constant:
 744       gfc_option.warn_real_q_constant = value;
 745       break;
 746
 747     case OPT_Wunused_dummy_argument:
 748       gfc_option.warn_unused_dummy_argument = value;
 749       break;
 750
 751     case OPT_Wzerotrip:
 752       gfc_option.warn_zerotrip = value;
 753       break;
 754
 755     case OPT_fall_intrinsics:
 756       gfc_option.flag_all_intrinsics = 1;
 757       break;
 758
 759     case OPT_fautomatic:
 760       gfc_option.flag_automatic = value;
 761       break;
 762
 763     case OPT_fallow_leading_underscore:
 764       gfc_option.flag_allow_leading_underscore = value;
 765       break;
 766
 767     case OPT_fbackslash:
 768       gfc_option.flag_backslash = value;
 769       break;
 770
 771     case OPT_fbacktrace:
 772       gfc_option.flag_backtrace = value;
 773       break;
 774
 775     case OPT_fcheck_array_temporaries:
 776       gfc_option.rtcheck |= GFC_RTCHECK_ARRAY_TEMPS;
 777       break;
 778
 779     case OPT_fcray_pointer:
 780       gfc_option.flag_cray_pointer = value;
 781       break;
 782
 783     case OPT_ff2c:
 784       gfc_option.flag_f2c = value;
 785       break;
 786
 787     case OPT_fdollar_ok:
 788       gfc_option.flag_dollar_ok = value;
 789       break;
 790
 791     case OPT_fexternal_blas:
 792       gfc_option.flag_external_blas = value;
 793       break;
 794
 795     case OPT_fblas_matmul_limit_:
 796       gfc_option.blas_matmul_limit = value;
 797       break;
 798
 799     case OPT_fd_lines_as_code:
 800       gfc_option.flag_d_lines = 1;
 801       break;
 802
 803     case OPT_fd_lines_as_comments:
 804       gfc_option.flag_d_lines = 0;
 805       break;
 806
 807     case OPT_fdump_fortran_original:
 808     case OPT_fdump_parse_tree:
 809       gfc_option.dump_fortran_original = value;
 810       break;
 811
 812     case OPT_fdump_fortran_optimized:
 813       gfc_option.dump_fortran_optimized = value;
 814       break;
 815
 816     case OPT_ffixed_form:
 817       gfc_option.source_form = FORM_FIXED;
 818       break;
 819
 820     case OPT_ffixed_line_length_none:
 821       gfc_option.fixed_line_length = 0;
 822       break;
 823
 824     case OPT_ffixed_line_length_:
 825       if (value != 0 && value < 7)
 826         gfc_fatal_error ("Fixed line length must be at least seven");
 827       gfc_option.fixed_line_length = value;
 828       break;
 829
 830     case OPT_ffree_form:
 831       gfc_option.source_form = FORM_FREE;
 832       break;
 833
 834     case OPT_fopenmp:
 835       gfc_option.gfc_flag_openmp = value;
 836       break;
 837
 838     case OPT_fopenmp_simd:
 839       gfc_option.gfc_flag_openmp_simd = value;
 840       break;
 841
 842     case OPT_ffree_line_length_none:
 843       gfc_option.free_line_length = 0;
 844       break;
 845
 846     case OPT_ffree_line_length_:
 847       if (value != 0 && value < 4)
 848         gfc_fatal_error ("Free line length must be at least three");
 849       gfc_option.free_line_length = value;
 850       break;
 851
 852     case OPT_funderscoring:
 853       gfc_option.flag_underscoring = value;
 854       break;
 855
 856     case OPT_fsecond_underscore:
 857       gfc_option.flag_second_underscore = value;
 858       break;
 859
 860     case OPT_static_libgfortran:
 861 #ifndef HAVE_LD_STATIC_DYNAMIC
 862       gfc_fatal_error ("%<-static-libgfortran%> is not supported in this "
 863                        "configuration");
 864 #endif
 865       break;
 866
 867     case OPT_fimplicit_none:
 868       gfc_option.flag_implicit_none = value;
 869       break;
 870
 871     case OPT_fintrinsic_modules_path:
 872     case OPT_fintrinsic_modules_path_:
 873
 874       /* This is needed because omp_lib.h is in a directory together
 875          with intrinsic modules.  Do no warn because during testing
 876          without an installed compiler, we would get lots of bogus
 877          warnings for a missing include directory.  */
 878       gfc_add_include_path (arg, false, false, false);
 879
 880       gfc_add_intrinsic_modules_path (arg);
 881       break;
 882
 883     case OPT_fmax_array_constructor_:
 884       gfc_option.flag_max_array_constructor = value > 65535 ? value : 65535;
 885       break;
 886
 887     case OPT_fmax_stack_var_size_:
 888       gfc_option.flag_max_stack_var_size = value;
 889       break;
 890
 891     case OPT_fstack_arrays:
 892       gfc_option.flag_stack_arrays = value;
 893       break;
 894
 895     case OPT_fmodule_private:
 896       gfc_option.flag_module_private = value;
 897       break;
 898
 899     case OPT_frange_check:
 900       gfc_option.flag_range_check = value;
 901       break;
 902
 903     case OPT_fpack_derived:
 904       gfc_option.flag_pack_derived = value;
 905       break;
 906
 907     case OPT_frepack_arrays:
 908       gfc_option.flag_repack_arrays = value;
 909       break;
 910
 911     case OPT_fpreprocessed:
 912       gfc_option.flag_preprocessed = value;
 913       break;
 914
 915     case OPT_fmax_identifier_length_:
 916       if (value > GFC_MAX_SYMBOL_LEN)
 917         gfc_fatal_error ("Maximum supported identifier length is %d",
 918                          GFC_MAX_SYMBOL_LEN);
 919       gfc_option.max_identifier_length = value;
 920       break;
 921
 922     case OPT_fdefault_integer_8:
 923       gfc_option.flag_default_integer = value;
 924       break;
 925
 926     case OPT_fdefault_real_8:
 927       gfc_option.flag_default_real = value;
 928       break;
 929
 930     case OPT_fdefault_double_8:
 931       gfc_option.flag_default_double = value;
 932       break;
 933
 934     case OPT_finteger_4_integer_8:
 935       gfc_option.flag_integer4_kind = 8;
 936       break;
 937
 938     case OPT_freal_4_real_8:
 939       gfc_option.flag_real4_kind = 8;
 940       break;
 941
 942     case OPT_freal_4_real_10:
 943       gfc_option.flag_real4_kind = 10;
 944       break;
 945
 946     case OPT_freal_4_real_16:
 947       gfc_option.flag_real4_kind = 16;
 948       break;
 949
 950     case OPT_freal_8_real_4:
 951       gfc_option.flag_real8_kind = 4;
 952       break;
 953
 954     case OPT_freal_8_real_10:
 955       gfc_option.flag_real8_kind = 10;
 956       break;
 957
 958     case OPT_freal_8_real_16:
 959       gfc_option.flag_real8_kind = 16;
 960       break;
 961
 962     case OPT_finit_local_zero:
 963       gfc_option.flag_init_integer = GFC_INIT_INTEGER_ON;
 964       gfc_option.flag_init_integer_value = 0;
 965       gfc_option.flag_init_real = GFC_INIT_REAL_ZERO;
 966       gfc_option.flag_init_logical = GFC_INIT_LOGICAL_FALSE;
 967       gfc_option.flag_init_character = GFC_INIT_CHARACTER_ON;
 968       gfc_option.flag_init_character_value = (char)0;
 969       break;
 970
 971     case OPT_finit_logical_:
 972       if (!strcasecmp (arg, "false"))
 973         gfc_option.flag_init_logical = GFC_INIT_LOGICAL_FALSE;
 974       else if (!strcasecmp (arg, "true"))
 975         gfc_option.flag_init_logical = GFC_INIT_LOGICAL_TRUE;
 976       else
 977         gfc_fatal_error ("Unrecognized option to %<-finit-logical%>: %s",
 978                          arg);
 979       break;
 980
 981     case OPT_finit_real_:
 982       if (!strcasecmp (arg, "zero"))
 983         gfc_option.flag_init_real = GFC_INIT_REAL_ZERO;
 984       else if (!strcasecmp (arg, "nan"))
 985         gfc_option.flag_init_real = GFC_INIT_REAL_NAN;
 986       else if (!strcasecmp (arg, "snan"))
 987         gfc_option.flag_init_real = GFC_INIT_REAL_SNAN;
 988       else if (!strcasecmp (arg, "inf"))
 989         gfc_option.flag_init_real = GFC_INIT_REAL_INF;
 990       else if (!strcasecmp (arg, "-inf"))
 991         gfc_option.flag_init_real = GFC_INIT_REAL_NEG_INF;
 992       else
 993         gfc_fatal_error ("Unrecognized option to %<-finit-real%>: %s",
 994                          arg);
 995       break;
 996
 997     case OPT_finit_integer_:
 998       gfc_option.flag_init_integer = GFC_INIT_INTEGER_ON;
 999       gfc_option.flag_init_integer_value = atoi (arg);
1000       break;
1001
1002     case OPT_finit_character_:
1003       if (value >= 0 && value <= 127)
1004         {
1005           gfc_option.flag_init_character = GFC_INIT_CHARACTER_ON;
1006           gfc_option.flag_init_character_value = (char)value;
1007         }
1008       else
1009         gfc_fatal_error ("The value of n in %<-finit-character=n%> must be "
1010                          "between 0 and 127");
1011       break;
1012
1013     case OPT_I:
1014       gfc_add_include_path (arg, true, false, true);
1015       break;
1016
1017     case OPT_J:
1018       gfc_handle_module_path_options (arg);
1019       break;
1020
1021     case OPT_fsign_zero:
1022       gfc_option.flag_sign_zero = value;
1023       break;
1024
1025     case OPT_ffpe_trap_:
1026       gfc_handle_fpe_option (arg, true);
1027       break;
1028
1029     case OPT_ffpe_summary_:
1030       gfc_handle_fpe_option (arg, false);
1031       break;
1032
1033     case OPT_std_f95:
1034       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F95 | GFC_STD_F77
1035                              | GFC_STD_F2008_OBS;
1036       gfc_option.warn_std = GFC_STD_F95_OBS;
1037       gfc_option.max_continue_fixed = 19;
1038       gfc_option.max_continue_free = 39;
1039       gfc_option.max_identifier_length = 31;
1040       gfc_option.warn_ampersand = 1;
1041       gfc_option.warn_tabs = 0;
1042       break;
1043
1044     case OPT_std_f2003:
1045       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F77
1046         | GFC_STD_F2003 | GFC_STD_F95 | GFC_STD_F2008_OBS;
1047       gfc_option.warn_std = GFC_STD_F95_OBS;
1048       gfc_option.max_identifier_length = 63;
1049       gfc_option.warn_ampersand = 1;
1050       gfc_option.warn_tabs = 0;
1051       break;
1052
1053     case OPT_std_f2008:
1054       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F77
1055         | GFC_STD_F2003 | GFC_STD_F95 | GFC_STD_F2008 | GFC_STD_F2008_OBS;
1056       gfc_option.warn_std = GFC_STD_F95_OBS | GFC_STD_F2008_OBS;
1057       gfc_option.max_identifier_length = 63;
1058       gfc_option.warn_ampersand = 1;
1059       gfc_option.warn_tabs = 0;
1060       break;
1061
1062     case OPT_std_f2008ts:
1063       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F77
1064         | GFC_STD_F2003 | GFC_STD_F95 | GFC_STD_F2008 | GFC_STD_F2008_OBS
1065         | GFC_STD_F2008_TS;
1066       gfc_option.warn_std = GFC_STD_F95_OBS | GFC_STD_F2008_OBS;
1067       gfc_option.max_identifier_length = 63;
1068       gfc_option.warn_ampersand = 1;
1069       gfc_option.warn_tabs = 0;
1070       break;
1071
1072     case OPT_std_gnu:
1073       set_default_std_flags ();
1074       break;
1075
1076     case OPT_std_legacy:
1077       set_default_std_flags ();
1078       gfc_option.warn_std = 0;
1079       break;
1080
1081     case OPT_Wintrinsics_std:
1082       gfc_option.warn_intrinsics_std = value;
1083       break;
1084
1085     case OPT_fshort_enums:
1086       /* Handled in language-independent code.  */
1087       break;
1088
1089     case OPT_fconvert_little_endian:
1090       gfc_option.convert = GFC_CONVERT_LITTLE;
1091       break;
1092
1093     case OPT_fconvert_big_endian:
1094       gfc_option.convert = GFC_CONVERT_BIG;
1095       break;
1096
1097     case OPT_fconvert_native:
1098       gfc_option.convert = GFC_CONVERT_NATIVE;
1099       break;
1100
1101     case OPT_fconvert_swap:
1102       gfc_option.convert = GFC_CONVERT_SWAP;
1103       break;
1104
1105     case OPT_frecord_marker_4:
1106       gfc_option.record_marker = 4;
1107       break;
1108
1109     case OPT_frecord_marker_8:
1110       gfc_option.record_marker = 8;
1111       break;
1112
1113     case OPT_fmax_subrecord_length_:
1114       if (value > MAX_SUBRECORD_LENGTH)
1115         gfc_fatal_error ("Maximum subrecord length cannot exceed %d",
1116                          MAX_SUBRECORD_LENGTH);
1117
1118       gfc_option.max_subrecord_length = value;
1119       break;
1120
1121     case OPT_frecursive:
1122       gfc_option.flag_recursive = value;
1123       break;
1124
1125     case OPT_falign_commons:
1126       gfc_option.flag_align_commons = value;
1127       break;
1128
1129     case  OPT_faggressive_function_elimination:
1130       gfc_option.flag_aggressive_function_elimination = value;
1131       break;
1132
1133     case OPT_ffrontend_optimize:
1134       gfc_option.flag_frontend_optimize = value;
1135       break;
1136
1137     case OPT_fprotect_parens:
1138       gfc_option.flag_protect_parens = value;
1139       break;
1140
1141     case OPT_frealloc_lhs:
1142       gfc_option.flag_realloc_lhs = value;
1143       break;
1144
1145     case OPT_fcheck_:
1146       gfc_handle_runtime_check_option (arg);
1147       break;
1148
1149     case OPT_fcoarray_:
1150       gfc_handle_coarray_option (arg);
1151       break;
1152     }
1153
1154   Fortran_handle_option_auto (&global_options, &global_options_set,
1155                               scode, arg, value,
1156                               gfc_option_lang_mask (), kind,
1157                               loc, handlers, global_dc);
1158   return result;
1159 }
1160
1161
1162 /* Return a string with the options passed to the compiler; used for
1163    Fortran's compiler_options() intrinsic.  */
1164
1165 char *
1166 gfc_get_option_string (void)
1167 {
1168   unsigned j;
1169   size_t len, pos;
1170   char *result;
1171
1172   /* Allocate and return a one-character string with '\0'.  */
1173   if (!save_decoded_options_count)
1174     return XCNEWVEC (char, 1);
1175
1176   /* Determine required string length.  */
1177
1178   len = 0;
1179   for (j = 1; j < save_decoded_options_count; j++)
1180     {
1181       switch (save_decoded_options[j].opt_index)
1182         {
1183         case OPT_o:
1184         case OPT_d:
1185         case OPT_dumpbase:
1186         case OPT_dumpdir:
1187         case OPT_auxbase:
1188         case OPT_quiet:
1189         case OPT_version:
1190         case OPT_fintrinsic_modules_path:
1191         case OPT_fintrinsic_modules_path_:
1192           /* Ignore these.  */
1193           break;
1194         default:
1195           /* Ignore file names.  */
1196           if (save_decoded_options[j].orig_option_with_args_text[0] == '-')
1197             len += 1
1198                  + strlen (save_decoded_options[j].orig_option_with_args_text);
1199         }
1200     }
1201
1202   result = XCNEWVEC (char, len);
1203
1204   pos = 0;
1205   for (j = 1; j < save_decoded_options_count; j++)
1206     {
1207       switch (save_decoded_options[j].opt_index)
1208         {
1209         case OPT_o:
1210         case OPT_d:
1211         case OPT_dumpbase:
1212         case OPT_dumpdir:
1213         case OPT_auxbase:
1214         case OPT_quiet:
1215         case OPT_version:
1216         case OPT_fintrinsic_modules_path:
1217         case OPT_fintrinsic_modules_path_:
1218           /* Ignore these.  */
1219           continue;
1220
1221         case OPT_cpp_:
1222           /* Use "-cpp" rather than "-cpp=<temporary file>".  */
1223           len = 4;
1224           break;
1225
1226         default:
1227           /* Ignore file names.  */
1228           if (save_decoded_options[j].orig_option_with_args_text[0] != '-')
1229             continue;
1230
1231           len = strlen (save_decoded_options[j].orig_option_with_args_text);
1232         }
1233
1234       memcpy (&result[pos], save_decoded_options[j].orig_option_with_args_text, len);
1235       pos += len;
1236       result[pos++] = ' ';
1237     }
1238
1239   result[--pos] = '\0';
1240   return result;
1241 }