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_use_without_only = 0;
 111   gfc_option.warn_intrinsics_std = 0;
 112   gfc_option.warn_align_commons = 1;
 113   gfc_option.warn_real_q_constant = 0;
 114   gfc_option.warn_unused_dummy_argument = 0;
 115   gfc_option.warn_zerotrip = 0;
 116   gfc_option.warn_realloc_lhs = 0;
 117   gfc_option.warn_realloc_lhs_all = 0;
 118   gfc_option.warn_compare_reals = 0;
 119   gfc_option.warn_target_lifetime = 0;
 120   gfc_option.max_errors = 25;
 121
 122   gfc_option.flag_all_intrinsics = 0;
 123   gfc_option.flag_default_double = 0;
 124   gfc_option.flag_default_integer = 0;
 125   gfc_option.flag_default_real = 0;
 126   gfc_option.flag_integer4_kind = 0;
 127   gfc_option.flag_real4_kind = 0;
 128   gfc_option.flag_real8_kind = 0;
 129   gfc_option.flag_dollar_ok = 0;
 130   gfc_option.flag_underscoring = 1;
 131   gfc_option.flag_f2c = 0;
 132   gfc_option.flag_second_underscore = -1;
 133   gfc_option.flag_implicit_none = 0;
 134
 135   /* Default value of flag_max_stack_var_size is set in gfc_post_options.  */
 136   gfc_option.flag_max_stack_var_size = -2;
 137   gfc_option.flag_stack_arrays = -1;
 138
 139   gfc_option.flag_range_check = 1;
 140   gfc_option.flag_pack_derived = 0;
 141   gfc_option.flag_repack_arrays = 0;
 142   gfc_option.flag_preprocessed = 0;
 143   gfc_option.flag_automatic = 1;
 144   gfc_option.flag_backslash = 0;
 145   gfc_option.flag_module_private = 0;
 146   gfc_option.flag_backtrace = 1;
 147   gfc_option.flag_allow_leading_underscore = 0;
 148   gfc_option.flag_external_blas = 0;
 149   gfc_option.blas_matmul_limit = 30;
 150   gfc_option.flag_cray_pointer = 0;
 151   gfc_option.flag_d_lines = -1;
 152   gfc_option.gfc_flag_openmp = 0;
 153   gfc_option.flag_sign_zero = 1;
 154   gfc_option.flag_recursive = 0;
 155   gfc_option.flag_init_integer = GFC_INIT_INTEGER_OFF;
 156   gfc_option.flag_init_integer_value = 0;
 157   gfc_option.flag_init_real = GFC_INIT_REAL_OFF;
 158   gfc_option.flag_init_logical = GFC_INIT_LOGICAL_OFF;
 159   gfc_option.flag_init_character = GFC_INIT_CHARACTER_OFF;
 160   gfc_option.flag_init_character_value = (char)0;
 161   gfc_option.flag_align_commons = 1;
 162   gfc_option.flag_protect_parens = -1;
 163   gfc_option.flag_realloc_lhs = -1;
 164   gfc_option.flag_aggressive_function_elimination = 0;
 165   gfc_option.flag_frontend_optimize = -1;
 166
 167   gfc_option.fpe = 0;
 168   /* All except GFC_FPE_INEXACT.  */
 169   gfc_option.fpe_summary = GFC_FPE_INVALID | GFC_FPE_DENORMAL
 170                            | GFC_FPE_ZERO | GFC_FPE_OVERFLOW
 171                            | GFC_FPE_UNDERFLOW;
 172   gfc_option.rtcheck = 0;
 173   gfc_option.coarray = GFC_FCOARRAY_NONE;
 174
 175   /* ??? Wmissing-include-dirs is disabled by default in C/C++ but
 176      enabled by default in Fortran.  Ideally, we should express this
 177      in .opt, but that is not supported yet.  */
 178   if (!global_options_set.x_cpp_warn_missing_include_dirs)
 179     global_options.x_cpp_warn_missing_include_dirs = 1;;
 180
 181   set_default_std_flags ();
 182
 183   /* Initialize cpp-related options.  */
 184   gfc_cpp_init_options (decoded_options_count, decoded_options);
 185   gfc_diagnostics_init ();
 186 }
 187
 188
 189 /* Determine the source form from the filename extension.  We assume
 190    case insensitivity.  */
 191
 192 static gfc_source_form
 193 form_from_filename (const char *filename)
 194 {
 195   static const struct
 196   {
 197     const char *extension;
 198     gfc_source_form form;
 199   }
 200   exttype[] =
 201   {
 202     {
 203     ".f90", FORM_FREE}
 204     ,
 205     {
 206     ".f95", FORM_FREE}
 207     ,
 208     {
 209     ".f03", FORM_FREE}
 210     ,
 211     {
 212     ".f08", FORM_FREE}
 213     ,
 214     {
 215     ".f", FORM_FIXED}
 216     ,
 217     {
 218     ".for", FORM_FIXED}
 219     ,
 220     {
 221     ".ftn", FORM_FIXED}
 222     ,
 223     {
 224     "", FORM_UNKNOWN}
 225   };            /* sentinel value */
 226
 227   gfc_source_form f_form;
 228   const char *fileext;
 229   int i;
 230
 231   /* Find end of file name.  Note, filename is either a NULL pointer or
 232      a NUL terminated string.  */
 233   i = 0;
 234   while (filename[i] != '\0')
 235     i++;
 236
 237   /* Find last period.  */
 238   while (i >= 0 && (filename[i] != '.'))
 239     i--;
 240
 241   /* Did we see a file extension?  */
 242   if (i < 0)
 243     return FORM_UNKNOWN; /* Nope  */
 244
 245   /* Get file extension and compare it to others.  */
 246   fileext = &(filename[i]);
 247
 248   i = -1;
 249   f_form = FORM_UNKNOWN;
 250   do
 251     {
 252       i++;
 253       if (strcasecmp (fileext, exttype[i].extension) == 0)
 254         {
 255           f_form = exttype[i].form;
 256           break;
 257         }
 258     }
 259   while (exttype[i].form != FORM_UNKNOWN);
 260
 261   return f_form;
 262 }
 263
 264
 265 /* Finalize commandline options.  */
 266
 267 bool
 268 gfc_post_options (const char **pfilename)
 269 {
 270   const char *filename = *pfilename, *canon_source_file = NULL;
 271   char *source_path;
 272   int i;
 273
 274   /* Excess precision other than "fast" requires front-end
 275      support.  */
 276   if (flag_excess_precision_cmdline == EXCESS_PRECISION_STANDARD
 277       && TARGET_FLT_EVAL_METHOD_NON_DEFAULT)
 278     sorry ("-fexcess-precision=standard for Fortran");
 279   flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;
 280
 281   /* Fortran allows associative math - but we cannot reassociate if
 282      we want traps or signed zeros. Cf. also flag_protect_parens.  */
 283   if (flag_associative_math == -1)
 284     flag_associative_math = (!flag_trapping_math && !flag_signed_zeros);
 285
 286   if (gfc_option.flag_protect_parens == -1)
 287     gfc_option.flag_protect_parens = !optimize_fast;
 288
 289   if (gfc_option.flag_stack_arrays == -1)
 290     gfc_option.flag_stack_arrays = optimize_fast;
 291
 292   /* By default, disable (re)allocation during assignment for -std=f95,
 293      and enable it for F2003/F2008/GNU/Legacy.  */
 294   if (gfc_option.flag_realloc_lhs == -1)
 295     {
 296       if (gfc_option.allow_std & GFC_STD_F2003)
 297         gfc_option.flag_realloc_lhs = 1;
 298       else
 299         gfc_option.flag_realloc_lhs = 0;
 300     }
 301
 302   /* -fbounds-check is equivalent to -fcheck=bounds */
 303   if (flag_bounds_check)
 304     gfc_option.rtcheck |= GFC_RTCHECK_BOUNDS;
 305
 306   if (flag_compare_debug)
 307     gfc_option.dump_fortran_original = 0;
 308
 309   /* Make -fmax-errors visible to gfortran's diagnostic machinery.  */
 310   if (global_options_set.x_flag_max_errors)
 311     gfc_option.max_errors = flag_max_errors;
 312
 313   /* Verify the input file name.  */
 314   if (!filename || strcmp (filename, "-") == 0)
 315     {
 316       filename = "";
 317     }
 318
 319   if (gfc_option.flag_preprocessed)
 320     {
 321       /* For preprocessed files, if the first tokens are of the form # NUM.
 322          handle the directives so we know the original file name.  */
 323       gfc_source_file = gfc_read_orig_filename (filename, &canon_source_file);
 324       if (gfc_source_file == NULL)
 325         gfc_source_file = filename;
 326       else
 327         *pfilename = gfc_source_file;
 328     }
 329   else
 330     gfc_source_file = filename;
 331
 332   if (canon_source_file == NULL)
 333     canon_source_file = gfc_source_file;
 334
 335   /* Adds the path where the source file is to the list of include files.  */
 336
 337   i = strlen (canon_source_file);
 338   while (i > 0 && !IS_DIR_SEPARATOR (canon_source_file[i]))
 339     i--;
 340
 341   if (i != 0)
 342     {
 343       source_path = (char *) alloca (i + 1);
 344       memcpy (source_path, canon_source_file, i);
 345       source_path[i] = 0;
 346       gfc_add_include_path (source_path, true, true, true);
 347     }
 348   else
 349     gfc_add_include_path (".", true, true, true);
 350
 351   if (canon_source_file != gfc_source_file)
 352     free (CONST_CAST (char *, canon_source_file));
 353
 354   /* Decide which form the file will be read in as.  */
 355
 356   if (gfc_option.source_form != FORM_UNKNOWN)
 357     gfc_current_form = gfc_option.source_form;
 358   else
 359     {
 360       gfc_current_form = form_from_filename (filename);
 361
 362       if (gfc_current_form == FORM_UNKNOWN)
 363         {
 364           gfc_current_form = FORM_FREE;
 365           gfc_warning_now_2 ("Reading file %qs as free form",
 366                              (filename[0] == '\0') ? "<stdin>" : filename);
 367         }
 368     }
 369
 370   /* If the user specified -fd-lines-as-{code|comments} verify that we're
 371      in fixed form.  */
 372   if (gfc_current_form == FORM_FREE)
 373     {
 374       if (gfc_option.flag_d_lines == 0)
 375         gfc_warning_now_2 ("%<-fd-lines-as-comments%> has no effect "
 376                            "in free form");
 377       else if (gfc_option.flag_d_lines == 1)
 378         gfc_warning_now_2 ("%<-fd-lines-as-code%> has no effect in free form");
 379     }
 380
 381   /* If -pedantic, warn about the use of GNU extensions.  */
 382   if (pedantic && (gfc_option.allow_std & GFC_STD_GNU) != 0)
 383     gfc_option.warn_std |= GFC_STD_GNU;
 384   /* -std=legacy -pedantic is effectively -std=gnu.  */
 385   if (pedantic && (gfc_option.allow_std & GFC_STD_LEGACY) != 0)
 386     gfc_option.warn_std |= GFC_STD_F95_OBS | GFC_STD_F95_DEL | GFC_STD_LEGACY;
 387
 388   /* If the user didn't explicitly specify -f(no)-second-underscore we
 389      use it if we're trying to be compatible with f2c, and not
 390      otherwise.  */
 391   if (gfc_option.flag_second_underscore == -1)
 392     gfc_option.flag_second_underscore = gfc_option.flag_f2c;
 393
 394   if (!gfc_option.flag_automatic && gfc_option.flag_max_stack_var_size != -2
 395       && gfc_option.flag_max_stack_var_size != 0)
 396     gfc_warning_now_2 ("Flag %<-fno-automatic%> overwrites %<-fmax-stack-var-size=%d%>",
 397                        gfc_option.flag_max_stack_var_size);
 398   else if (!gfc_option.flag_automatic && gfc_option.flag_recursive)
 399     gfc_warning_now_2 ("Flag %<-fno-automatic%> overwrites %<-frecursive%>");
 400   else if (!gfc_option.flag_automatic && gfc_option.gfc_flag_openmp)
 401     gfc_warning_now_2 ("Flag %<-fno-automatic%> overwrites %<-frecursive%> implied by "
 402                        "%<-fopenmp%>");
 403   else if (gfc_option.flag_max_stack_var_size != -2
 404            && gfc_option.flag_recursive)
 405     gfc_warning_now_2 ("Flag %<-frecursive%> overwrites %<-fmax-stack-var-size=%d%>",
 406                        gfc_option.flag_max_stack_var_size);
 407   else if (gfc_option.flag_max_stack_var_size != -2
 408            && gfc_option.gfc_flag_openmp)
 409     gfc_warning_now_2 ("Flag %<-fmax-stack-var-size=%d%> overwrites %<-frecursive%> "
 410                        "implied by %<-fopenmp%>",
 411                      gfc_option.flag_max_stack_var_size);
 412
 413   /* Implement -frecursive as -fmax-stack-var-size=-1.  */
 414   if (gfc_option.flag_recursive)
 415     gfc_option.flag_max_stack_var_size = -1;
 416
 417   /* Implied -frecursive; implemented as -fmax-stack-var-size=-1.  */
 418   if (gfc_option.flag_max_stack_var_size == -2 && gfc_option.gfc_flag_openmp
 419       && gfc_option.flag_automatic)
 420     {
 421       gfc_option.flag_recursive = 1;
 422       gfc_option.flag_max_stack_var_size = -1;
 423     }
 424
 425   /* Set default.  */
 426   if (gfc_option.flag_max_stack_var_size == -2)
 427     gfc_option.flag_max_stack_var_size = 32768;
 428
 429   /* Implement -fno-automatic as -fmax-stack-var-size=0.  */
 430   if (!gfc_option.flag_automatic)
 431     gfc_option.flag_max_stack_var_size = 0;
 432
 433   if (pedantic)
 434     {
 435       gfc_option.warn_ampersand = 1;
 436       gfc_option.warn_tabs = 0;
 437     }
 438
 439   /* Optimization implies front end optimization, unless the user
 440      specified it directly.  */
 441
 442   if (gfc_option.flag_frontend_optimize == -1)
 443     gfc_option.flag_frontend_optimize = optimize;
 444
 445   if (gfc_option.warn_realloc_lhs_all)
 446     gfc_option.warn_realloc_lhs = 1;
 447
 448   gfc_cpp_post_options ();
 449
 450   return gfc_cpp_preprocess_only ();
 451 }
 452
 453
 454 /* Set the options for -Wall.  */
 455
 456 static void
 457 set_Wall (int setting)
 458 {
 459   gfc_option.warn_aliasing = setting;
 460   gfc_option.warn_ampersand = setting;
 461   gfc_option.warn_c_binding_type = setting;
 462   gfc_option.gfc_warn_conversion = setting;
 463   gfc_option.warn_line_truncation = setting;
 464   gfc_option.warn_surprising = setting;
 465   gfc_option.warn_tabs = !setting;
 466   gfc_option.warn_underflow = setting;
 467   gfc_option.warn_intrinsic_shadow = setting;
 468   gfc_option.warn_intrinsics_std = setting;
 469   gfc_option.warn_character_truncation = setting;
 470   gfc_option.warn_real_q_constant = setting;
 471   gfc_option.warn_unused_dummy_argument = setting;
 472   gfc_option.warn_target_lifetime = setting;
 473   gfc_option.warn_zerotrip = setting;
 474
 475   warn_return_type = setting;
 476   warn_uninitialized = setting;
 477   warn_maybe_uninitialized = setting;
 478 }
 479
 480 /* Set the options for -Wextra.  */
 481
 482 static void
 483 set_Wextra (int setting)
 484 {
 485   gfc_option.warn_compare_reals = setting;
 486 }
 487
 488 static void
 489 gfc_handle_module_path_options (const char *arg)
 490 {
 491
 492   if (gfc_option.module_dir != NULL)
 493     gfc_fatal_error ("gfortran: Only one -J option allowed");
 494
 495   gfc_option.module_dir = XCNEWVEC (char, strlen (arg) + 2);
 496   strcpy (gfc_option.module_dir, arg);
 497
 498   gfc_add_include_path (gfc_option.module_dir, true, false, true);
 499
 500   strcat (gfc_option.module_dir, "/");
 501 }
 502
 503
 504 /* Handle options -ffpe-trap= and -ffpe-summary=.  */
 505
 506 static void
 507 gfc_handle_fpe_option (const char *arg, bool trap)
 508 {
 509   int result, pos = 0, n;
 510   /* precision is a backwards compatibility alias for inexact.  */
 511   static const char * const exception[] = { "invalid", "denormal", "zero",
 512                                             "overflow", "underflow",
 513                                             "inexact", "precision", NULL };
 514   static const int opt_exception[] = { GFC_FPE_INVALID, GFC_FPE_DENORMAL,
 515                                        GFC_FPE_ZERO, GFC_FPE_OVERFLOW,
 516                                        GFC_FPE_UNDERFLOW, GFC_FPE_INEXACT,
 517                                        GFC_FPE_INEXACT,
 518                                        0 };
 519
 520   /* As the default for -ffpe-summary= is nonzero, set it to 0.  */
 521   if (!trap)
 522     gfc_option.fpe_summary = 0;
 523
 524   while (*arg)
 525     {
 526       while (*arg == ',')
 527         arg++;
 528
 529       while (arg[pos] && arg[pos] != ',')
 530         pos++;
 531
 532       result = 0;
 533       if (!trap && strncmp ("none", arg, pos) == 0)
 534         {
 535           gfc_option.fpe_summary = 0;
 536           arg += pos;
 537           pos = 0;
 538           continue;
 539         }
 540       else if (!trap && strncmp ("all", arg, pos) == 0)
 541         {
 542           gfc_option.fpe_summary = GFC_FPE_INVALID | GFC_FPE_DENORMAL
 543                                    | GFC_FPE_ZERO | GFC_FPE_OVERFLOW
 544                                    | GFC_FPE_UNDERFLOW | GFC_FPE_INEXACT;
 545           arg += pos;
 546           pos = 0;
 547           continue;
 548         }
 549       else
 550         for (n = 0; exception[n] != NULL; n++)
 551           {
 552           if (exception[n] && strncmp (exception[n], arg, pos) == 0)
 553             {
 554               if (trap)
 555                 gfc_option.fpe |= opt_exception[n];
 556               else
 557                 gfc_option.fpe_summary |= opt_exception[n];
 558               arg += pos;
 559               pos = 0;
 560               result = 1;
 561               break;
 562             }
 563           }
 564       if (!result && !trap)
 565         gfc_fatal_error ("Argument to -ffpe-trap is not valid: %s", arg);
 566       else if (!result)
 567         gfc_fatal_error ("Argument to -ffpe-summary is not valid: %s", arg);
 568
 569     }
 570 }
 571
 572
 573 static void
 574 gfc_handle_coarray_option (const char *arg)
 575 {
 576   if (strcmp (arg, "none") == 0)
 577     gfc_option.coarray = GFC_FCOARRAY_NONE;
 578   else if (strcmp (arg, "single") == 0)
 579     gfc_option.coarray = GFC_FCOARRAY_SINGLE;
 580   else if (strcmp (arg, "lib") == 0)
 581     gfc_option.coarray = GFC_FCOARRAY_LIB;
 582   else
 583     gfc_fatal_error ("Argument to -fcoarray is not valid: %s", arg);
 584 }
 585
 586
 587 static void
 588 gfc_handle_runtime_check_option (const char *arg)
 589 {
 590   int result, pos = 0, n;
 591   static const char * const optname[] = { "all", "bounds", "array-temps",
 592                                           "recursion", "do", "pointer",
 593                                           "mem", NULL };
 594   static const int optmask[] = { GFC_RTCHECK_ALL, GFC_RTCHECK_BOUNDS,
 595                                  GFC_RTCHECK_ARRAY_TEMPS,
 596                                  GFC_RTCHECK_RECURSION, GFC_RTCHECK_DO,
 597                                  GFC_RTCHECK_POINTER, GFC_RTCHECK_MEM,
 598                                  0 };
 599
 600   while (*arg)
 601     {
 602       while (*arg == ',')
 603         arg++;
 604
 605       while (arg[pos] && arg[pos] != ',')
 606         pos++;
 607
 608       result = 0;
 609       for (n = 0; optname[n] != NULL; n++)
 610         {
 611           if (optname[n] && strncmp (optname[n], arg, pos) == 0)
 612             {
 613               gfc_option.rtcheck |= optmask[n];
 614               arg += pos;
 615               pos = 0;
 616               result = 1;
 617               break;
 618             }
 619         }
 620       if (!result)
 621         gfc_fatal_error ("Argument to -fcheck is not valid: %s", arg);
 622     }
 623 }
 624
 625
 626 /* Handle command-line options.  Returns 0 if unrecognized, 1 if
 627    recognized and handled.  */
 628
 629 bool
 630 gfc_handle_option (size_t scode, const char *arg, int value,
 631                    int kind ATTRIBUTE_UNUSED, location_t loc ATTRIBUTE_UNUSED,
 632                    const struct cl_option_handlers *handlers ATTRIBUTE_UNUSED)
 633 {
 634   bool result = true;
 635   enum opt_code code = (enum opt_code) scode;
 636
 637   if (gfc_cpp_handle_option (scode, arg, value) == 1)
 638     return true;
 639
 640   switch (code)
 641     {
 642     default:
 643       if (cl_options[code].flags & gfc_option_lang_mask ())
 644         break;
 645       result = false;
 646       break;
 647
 648     case OPT_Wall:
 649       handle_generated_option (&global_options, &global_options_set,
 650                                OPT_Wunused, NULL, value,
 651                                gfc_option_lang_mask (), kind, loc,
 652                                handlers, global_dc);
 653       set_Wall (value);
 654       break;
 655
 656     case OPT_Waliasing:
 657       gfc_option.warn_aliasing = value;
 658       break;
 659
 660     case OPT_Wampersand:
 661       gfc_option.warn_ampersand = value;
 662       break;
 663
 664     case OPT_Warray_temporaries:
 665       gfc_option.warn_array_temp = value;
 666       break;
 667
 668     case OPT_Wc_binding_type:
 669       gfc_option.warn_c_binding_type = value;
 670       break;
 671
 672     case OPT_Wcharacter_truncation:
 673       gfc_option.warn_character_truncation = value;
 674       break;
 675
 676     case OPT_Wcompare_reals:
 677       gfc_option.warn_compare_reals = value;
 678       break;
 679
 680     case OPT_Wconversion:
 681       gfc_option.gfc_warn_conversion = value;
 682       break;
 683
 684     case OPT_Wconversion_extra:
 685       gfc_option.warn_conversion_extra = value;
 686       break;
 687
 688     case OPT_Wextra:
 689       set_Wextra (value);
 690       break;
 691
 692     case OPT_Wfunction_elimination:
 693       gfc_option.warn_function_elimination = value;
 694       break;
 695
 696     case OPT_Wimplicit_interface:
 697       gfc_option.warn_implicit_interface = value;
 698       break;
 699
 700     case OPT_Wimplicit_procedure:
 701       gfc_option.warn_implicit_procedure = value;
 702       break;
 703
 704     case OPT_Wline_truncation:
 705       gfc_option.warn_line_truncation = value;
 706       break;
 707
 708     case OPT_Wrealloc_lhs:
 709       gfc_option.warn_realloc_lhs = value;
 710       break;
 711
 712     case OPT_Wrealloc_lhs_all:
 713       gfc_option.warn_realloc_lhs_all = value;
 714       break;
 715
 716     case OPT_Wreturn_type:
 717       warn_return_type = value;
 718       break;
 719
 720     case OPT_Wsurprising:
 721       gfc_option.warn_surprising = value;
 722       break;
 723
 724     case OPT_Wtabs:
 725       gfc_option.warn_tabs = value;
 726       break;
 727
 728     case OPT_Wtarget_lifetime:
 729       gfc_option.warn_target_lifetime = value;
 730       break;
 731
 732     case OPT_Wunderflow:
 733       gfc_option.warn_underflow = value;
 734       break;
 735
 736     case OPT_Wintrinsic_shadow:
 737       gfc_option.warn_intrinsic_shadow = value;
 738       break;
 739
 740     case OPT_Wuse_without_only:
 741       gfc_option.warn_use_without_only = value;
 742       break;
 743
 744     case OPT_Walign_commons:
 745       gfc_option.warn_align_commons = value;
 746       break;
 747
 748     case OPT_Wreal_q_constant:
 749       gfc_option.warn_real_q_constant = value;
 750       break;
 751
 752     case OPT_Wunused_dummy_argument:
 753       gfc_option.warn_unused_dummy_argument = value;
 754       break;
 755
 756     case OPT_Wzerotrip:
 757       gfc_option.warn_zerotrip = value;
 758       break;
 759
 760     case OPT_fall_intrinsics:
 761       gfc_option.flag_all_intrinsics = 1;
 762       break;
 763
 764     case OPT_fautomatic:
 765       gfc_option.flag_automatic = value;
 766       break;
 767
 768     case OPT_fallow_leading_underscore:
 769       gfc_option.flag_allow_leading_underscore = value;
 770       break;
 771
 772     case OPT_fbackslash:
 773       gfc_option.flag_backslash = value;
 774       break;
 775
 776     case OPT_fbacktrace:
 777       gfc_option.flag_backtrace = value;
 778       break;
 779
 780     case OPT_fcheck_array_temporaries:
 781       gfc_option.rtcheck |= GFC_RTCHECK_ARRAY_TEMPS;
 782       break;
 783
 784     case OPT_fcray_pointer:
 785       gfc_option.flag_cray_pointer = value;
 786       break;
 787
 788     case OPT_ff2c:
 789       gfc_option.flag_f2c = value;
 790       break;
 791
 792     case OPT_fdollar_ok:
 793       gfc_option.flag_dollar_ok = value;
 794       break;
 795
 796     case OPT_fexternal_blas:
 797       gfc_option.flag_external_blas = value;
 798       break;
 799
 800     case OPT_fblas_matmul_limit_:
 801       gfc_option.blas_matmul_limit = value;
 802       break;
 803
 804     case OPT_fd_lines_as_code:
 805       gfc_option.flag_d_lines = 1;
 806       break;
 807
 808     case OPT_fd_lines_as_comments:
 809       gfc_option.flag_d_lines = 0;
 810       break;
 811
 812     case OPT_fdump_fortran_original:
 813     case OPT_fdump_parse_tree:
 814       gfc_option.dump_fortran_original = value;
 815       break;
 816
 817     case OPT_fdump_fortran_optimized:
 818       gfc_option.dump_fortran_optimized = value;
 819       break;
 820
 821     case OPT_ffixed_form:
 822       gfc_option.source_form = FORM_FIXED;
 823       break;
 824
 825     case OPT_ffixed_line_length_none:
 826       gfc_option.fixed_line_length = 0;
 827       break;
 828
 829     case OPT_ffixed_line_length_:
 830       if (value != 0 && value < 7)
 831         gfc_fatal_error ("Fixed line length must be at least seven.");
 832       gfc_option.fixed_line_length = value;
 833       break;
 834
 835     case OPT_ffree_form:
 836       gfc_option.source_form = FORM_FREE;
 837       break;
 838
 839     case OPT_fopenmp:
 840       gfc_option.gfc_flag_openmp = value;
 841       break;
 842
 843     case OPT_fopenmp_simd:
 844       gfc_option.gfc_flag_openmp_simd = value;
 845       break;
 846
 847     case OPT_ffree_line_length_none:
 848       gfc_option.free_line_length = 0;
 849       break;
 850
 851     case OPT_ffree_line_length_:
 852       if (value != 0 && value < 4)
 853         gfc_fatal_error ("Free line length must be at least three.");
 854       gfc_option.free_line_length = value;
 855       break;
 856
 857     case OPT_funderscoring:
 858       gfc_option.flag_underscoring = value;
 859       break;
 860
 861     case OPT_fsecond_underscore:
 862       gfc_option.flag_second_underscore = value;
 863       break;
 864
 865     case OPT_static_libgfortran:
 866 #ifndef HAVE_LD_STATIC_DYNAMIC
 867       gfc_fatal_error ("-static-libgfortran is not supported in this "
 868                        "configuration");
 869 #endif
 870       break;
 871
 872     case OPT_fimplicit_none:
 873       gfc_option.flag_implicit_none = value;
 874       break;
 875
 876     case OPT_fintrinsic_modules_path:
 877     case OPT_fintrinsic_modules_path_:
 878
 879       /* This is needed because omp_lib.h is in a directory together
 880          with intrinsic modules.  Do no warn because during testing
 881          without an installed compiler, we would get lots of bogus
 882          warnings for a missing include directory.  */
 883       gfc_add_include_path (arg, false, false, false);
 884
 885       gfc_add_intrinsic_modules_path (arg);
 886       break;
 887
 888     case OPT_fmax_array_constructor_:
 889       gfc_option.flag_max_array_constructor = value > 65535 ? value : 65535;
 890       break;
 891
 892     case OPT_fmax_stack_var_size_:
 893       gfc_option.flag_max_stack_var_size = value;
 894       break;
 895
 896     case OPT_fstack_arrays:
 897       gfc_option.flag_stack_arrays = value;
 898       break;
 899
 900     case OPT_fmodule_private:
 901       gfc_option.flag_module_private = value;
 902       break;
 903
 904     case OPT_frange_check:
 905       gfc_option.flag_range_check = value;
 906       break;
 907
 908     case OPT_fpack_derived:
 909       gfc_option.flag_pack_derived = value;
 910       break;
 911
 912     case OPT_frepack_arrays:
 913       gfc_option.flag_repack_arrays = value;
 914       break;
 915
 916     case OPT_fpreprocessed:
 917       gfc_option.flag_preprocessed = value;
 918       break;
 919
 920     case OPT_fmax_identifier_length_:
 921       if (value > GFC_MAX_SYMBOL_LEN)
 922         gfc_fatal_error ("Maximum supported identifier length is %d",
 923                          GFC_MAX_SYMBOL_LEN);
 924       gfc_option.max_identifier_length = value;
 925       break;
 926
 927     case OPT_fdefault_integer_8:
 928       gfc_option.flag_default_integer = value;
 929       break;
 930
 931     case OPT_fdefault_real_8:
 932       gfc_option.flag_default_real = value;
 933       break;
 934
 935     case OPT_fdefault_double_8:
 936       gfc_option.flag_default_double = value;
 937       break;
 938
 939     case OPT_finteger_4_integer_8:
 940       gfc_option.flag_integer4_kind = 8;
 941       break;
 942
 943     case OPT_freal_4_real_8:
 944       gfc_option.flag_real4_kind = 8;
 945       break;
 946
 947     case OPT_freal_4_real_10:
 948       gfc_option.flag_real4_kind = 10;
 949       break;
 950
 951     case OPT_freal_4_real_16:
 952       gfc_option.flag_real4_kind = 16;
 953       break;
 954
 955     case OPT_freal_8_real_4:
 956       gfc_option.flag_real8_kind = 4;
 957       break;
 958
 959     case OPT_freal_8_real_10:
 960       gfc_option.flag_real8_kind = 10;
 961       break;
 962
 963     case OPT_freal_8_real_16:
 964       gfc_option.flag_real8_kind = 16;
 965       break;
 966
 967     case OPT_finit_local_zero:
 968       gfc_option.flag_init_integer = GFC_INIT_INTEGER_ON;
 969       gfc_option.flag_init_integer_value = 0;
 970       gfc_option.flag_init_real = GFC_INIT_REAL_ZERO;
 971       gfc_option.flag_init_logical = GFC_INIT_LOGICAL_FALSE;
 972       gfc_option.flag_init_character = GFC_INIT_CHARACTER_ON;
 973       gfc_option.flag_init_character_value = (char)0;
 974       break;
 975
 976     case OPT_finit_logical_:
 977       if (!strcasecmp (arg, "false"))
 978         gfc_option.flag_init_logical = GFC_INIT_LOGICAL_FALSE;
 979       else if (!strcasecmp (arg, "true"))
 980         gfc_option.flag_init_logical = GFC_INIT_LOGICAL_TRUE;
 981       else
 982         gfc_fatal_error ("Unrecognized option to -finit-logical: %s",
 983                          arg);
 984       break;
 985
 986     case OPT_finit_real_:
 987       if (!strcasecmp (arg, "zero"))
 988         gfc_option.flag_init_real = GFC_INIT_REAL_ZERO;
 989       else if (!strcasecmp (arg, "nan"))
 990         gfc_option.flag_init_real = GFC_INIT_REAL_NAN;
 991       else if (!strcasecmp (arg, "snan"))
 992         gfc_option.flag_init_real = GFC_INIT_REAL_SNAN;
 993       else if (!strcasecmp (arg, "inf"))
 994         gfc_option.flag_init_real = GFC_INIT_REAL_INF;
 995       else if (!strcasecmp (arg, "-inf"))
 996         gfc_option.flag_init_real = GFC_INIT_REAL_NEG_INF;
 997       else
 998         gfc_fatal_error ("Unrecognized option to -finit-real: %s",
 999                          arg);
1000       break;
1001
1002     case OPT_finit_integer_:
1003       gfc_option.flag_init_integer = GFC_INIT_INTEGER_ON;
1004       gfc_option.flag_init_integer_value = atoi (arg);
1005       break;
1006
1007     case OPT_finit_character_:
1008       if (value >= 0 && value <= 127)
1009         {
1010           gfc_option.flag_init_character = GFC_INIT_CHARACTER_ON;
1011           gfc_option.flag_init_character_value = (char)value;
1012         }
1013       else
1014         gfc_fatal_error ("The value of n in -finit-character=n must be "
1015                          "between 0 and 127");
1016       break;
1017
1018     case OPT_I:
1019       gfc_add_include_path (arg, true, false, true);
1020       break;
1021
1022     case OPT_J:
1023       gfc_handle_module_path_options (arg);
1024       break;
1025
1026     case OPT_fsign_zero:
1027       gfc_option.flag_sign_zero = value;
1028       break;
1029
1030     case OPT_ffpe_trap_:
1031       gfc_handle_fpe_option (arg, true);
1032       break;
1033
1034     case OPT_ffpe_summary_:
1035       gfc_handle_fpe_option (arg, false);
1036       break;
1037
1038     case OPT_std_f95:
1039       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F95 | GFC_STD_F77
1040                              | GFC_STD_F2008_OBS;
1041       gfc_option.warn_std = GFC_STD_F95_OBS;
1042       gfc_option.max_continue_fixed = 19;
1043       gfc_option.max_continue_free = 39;
1044       gfc_option.max_identifier_length = 31;
1045       gfc_option.warn_ampersand = 1;
1046       gfc_option.warn_tabs = 0;
1047       break;
1048
1049     case OPT_std_f2003:
1050       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F77
1051         | GFC_STD_F2003 | GFC_STD_F95 | GFC_STD_F2008_OBS;
1052       gfc_option.warn_std = GFC_STD_F95_OBS;
1053       gfc_option.max_identifier_length = 63;
1054       gfc_option.warn_ampersand = 1;
1055       gfc_option.warn_tabs = 0;
1056       break;
1057
1058     case OPT_std_f2008:
1059       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F77
1060         | GFC_STD_F2003 | GFC_STD_F95 | GFC_STD_F2008 | GFC_STD_F2008_OBS;
1061       gfc_option.warn_std = GFC_STD_F95_OBS | GFC_STD_F2008_OBS;
1062       gfc_option.max_identifier_length = 63;
1063       gfc_option.warn_ampersand = 1;
1064       gfc_option.warn_tabs = 0;
1065       break;
1066
1067     case OPT_std_f2008ts:
1068       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F77
1069         | GFC_STD_F2003 | GFC_STD_F95 | GFC_STD_F2008 | GFC_STD_F2008_OBS
1070         | GFC_STD_F2008_TS;
1071       gfc_option.warn_std = GFC_STD_F95_OBS | GFC_STD_F2008_OBS;
1072       gfc_option.max_identifier_length = 63;
1073       gfc_option.warn_ampersand = 1;
1074       gfc_option.warn_tabs = 0;
1075       break;
1076
1077     case OPT_std_gnu:
1078       set_default_std_flags ();
1079       break;
1080
1081     case OPT_std_legacy:
1082       set_default_std_flags ();
1083       gfc_option.warn_std = 0;
1084       break;
1085
1086     case OPT_Wintrinsics_std:
1087       gfc_option.warn_intrinsics_std = value;
1088       break;
1089
1090     case OPT_fshort_enums:
1091       /* Handled in language-independent code.  */
1092       break;
1093
1094     case OPT_fconvert_little_endian:
1095       gfc_option.convert = GFC_CONVERT_LITTLE;
1096       break;
1097
1098     case OPT_fconvert_big_endian:
1099       gfc_option.convert = GFC_CONVERT_BIG;
1100       break;
1101
1102     case OPT_fconvert_native:
1103       gfc_option.convert = GFC_CONVERT_NATIVE;
1104       break;
1105
1106     case OPT_fconvert_swap:
1107       gfc_option.convert = GFC_CONVERT_SWAP;
1108       break;
1109
1110     case OPT_frecord_marker_4:
1111       gfc_option.record_marker = 4;
1112       break;
1113
1114     case OPT_frecord_marker_8:
1115       gfc_option.record_marker = 8;
1116       break;
1117
1118     case OPT_fmax_subrecord_length_:
1119       if (value > MAX_SUBRECORD_LENGTH)
1120         gfc_fatal_error ("Maximum subrecord length cannot exceed %d",
1121                          MAX_SUBRECORD_LENGTH);
1122
1123       gfc_option.max_subrecord_length = value;
1124       break;
1125
1126     case OPT_frecursive:
1127       gfc_option.flag_recursive = value;
1128       break;
1129
1130     case OPT_falign_commons:
1131       gfc_option.flag_align_commons = value;
1132       break;
1133
1134     case  OPT_faggressive_function_elimination:
1135       gfc_option.flag_aggressive_function_elimination = value;
1136       break;
1137
1138     case OPT_ffrontend_optimize:
1139       gfc_option.flag_frontend_optimize = value;
1140       break;
1141
1142     case OPT_fprotect_parens:
1143       gfc_option.flag_protect_parens = value;
1144       break;
1145
1146     case OPT_frealloc_lhs:
1147       gfc_option.flag_realloc_lhs = value;
1148       break;
1149
1150     case OPT_fcheck_:
1151       gfc_handle_runtime_check_option (arg);
1152       break;
1153
1154     case OPT_fcoarray_:
1155       gfc_handle_coarray_option (arg);
1156       break;
1157     }
1158
1159   Fortran_handle_option_auto (&global_options, &global_options_set,
1160                               scode, arg, value,
1161                               gfc_option_lang_mask (), kind,
1162                               loc, handlers, global_dc);
1163   return result;
1164 }
1165
1166
1167 /* Return a string with the options passed to the compiler; used for
1168    Fortran's compiler_options() intrinsic.  */
1169
1170 char *
1171 gfc_get_option_string (void)
1172 {
1173   unsigned j;
1174   size_t len, pos;
1175   char *result;
1176
1177   /* Allocate and return a one-character string with '\0'.  */
1178   if (!save_decoded_options_count)
1179     return XCNEWVEC (char, 1);
1180
1181   /* Determine required string length.  */
1182
1183   len = 0;
1184   for (j = 1; j < save_decoded_options_count; j++)
1185     {
1186       switch (save_decoded_options[j].opt_index)
1187         {
1188         case OPT_o:
1189         case OPT_d:
1190         case OPT_dumpbase:
1191         case OPT_dumpdir:
1192         case OPT_auxbase:
1193         case OPT_quiet:
1194         case OPT_version:
1195         case OPT_fintrinsic_modules_path:
1196         case OPT_fintrinsic_modules_path_:
1197           /* Ignore these.  */
1198           break;
1199         default:
1200           /* Ignore file names.  */
1201           if (save_decoded_options[j].orig_option_with_args_text[0] == '-')
1202             len += 1
1203                  + strlen (save_decoded_options[j].orig_option_with_args_text);
1204         }
1205     }
1206
1207   result = XCNEWVEC (char, len);
1208
1209   pos = 0;
1210   for (j = 1; j < save_decoded_options_count; j++)
1211     {
1212       switch (save_decoded_options[j].opt_index)
1213         {
1214         case OPT_o:
1215         case OPT_d:
1216         case OPT_dumpbase:
1217         case OPT_dumpdir:
1218         case OPT_auxbase:
1219         case OPT_quiet:
1220         case OPT_version:
1221         case OPT_fintrinsic_modules_path:
1222         case OPT_fintrinsic_modules_path_:
1223           /* Ignore these.  */
1224           continue;
1225
1226         case OPT_cpp_:
1227           /* Use "-cpp" rather than "-cpp=<temporary file>".  */
1228           len = 4;
1229           break;
1230
1231         default:
1232           /* Ignore file names.  */
1233           if (save_decoded_options[j].orig_option_with_args_text[0] != '-')
1234             continue;
1235
1236           len = strlen (save_decoded_options[j].orig_option_with_args_text);
1237         }
1238
1239       memcpy (&result[pos], save_decoded_options[j].orig_option_with_args_text, len);
1240       pos += len;
1241       result[pos++] = ' ';
1242     }
1243
1244   result[--pos] = '\0';
1245   return result;
1246 }