gcc/fortran/options.cc

   1 /* Parse and display command line options.
   2    Copyright (C) 2000-2023 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 "target.h"
  25 #include "tree.h"
  26 #include "gfortran.h"
  27 #include "diagnostic.h" /* For global_dc.  */
  28 #include "opts.h"
  29 #include "toplev.h"  /* For save_decoded_options.  */
  30 #include "cpp.h"
  31 #include "langhooks.h"
  32
  33 gfc_option_t gfc_option;
  34
  35 #define SET_FLAG(flag, condition, on_value, off_value) \
  36   do \
  37     { \
  38       if (condition) \
  39         flag = (on_value); \
  40       else \
  41         flag = (off_value); \
  42     } while (0)
  43
  44 #define SET_BITFLAG2(m) m
  45
  46 #define SET_BITFLAG(flag, condition, value) \
  47   SET_BITFLAG2 (SET_FLAG (flag, condition, (flag | (value)), (flag & ~(value))))
  48
  49
  50 /* Set flags that control warnings and errors for different
  51    Fortran standards to their default values.  Keep in sync with
  52    libgfortran/runtime/compile_options.c (init_compile_options).  */
  53
  54 static void
  55 set_default_std_flags (void)
  56 {
  57   gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL
  58     | GFC_STD_F2003 | GFC_STD_F2008 | GFC_STD_F95 | GFC_STD_F77
  59     | GFC_STD_F2008_OBS | GFC_STD_GNU | GFC_STD_LEGACY
  60     | GFC_STD_F2018 | GFC_STD_F2018_DEL | GFC_STD_F2018_OBS;
  61   gfc_option.warn_std = GFC_STD_F2018_DEL | GFC_STD_F95_DEL | GFC_STD_LEGACY;
  62 }
  63
  64 /* Set (or unset) the DEC extension flags.  */
  65
  66 static void
  67 set_dec_flags (int value)
  68 {
  69   /* Set (or unset) other DEC compatibility extensions.  */
  70   SET_BITFLAG (flag_dollar_ok, value, value);
  71   SET_BITFLAG (flag_cray_pointer, value, value);
  72   SET_BITFLAG (flag_dec_structure, value, value);
  73   SET_BITFLAG (flag_dec_intrinsic_ints, value, value);
  74   SET_BITFLAG (flag_dec_static, value, value);
  75   SET_BITFLAG (flag_dec_math, value, value);
  76   SET_BITFLAG (flag_dec_include, value, value);
  77   SET_BITFLAG (flag_dec_format_defaults, value, value);
  78   SET_BITFLAG (flag_dec_blank_format_item, value, value);
  79   SET_BITFLAG (flag_dec_char_conversions, value, value);
  80 }
  81
  82 /* Finalize DEC flags.  */
  83
  84 static void
  85 post_dec_flags (int value)
  86 {
  87   /* Don't warn for legacy code if -fdec is given; however, setting -fno-dec
  88      does not force these warnings.  We make one final determination on this
  89      at the end because -std= is always set first; thus, we can avoid
  90      clobbering the user's desired standard settings in gfc_handle_option
  91      e.g. when -fdec and -fno-dec are both given.  */
  92   if (value)
  93     {
  94       gfc_option.allow_std |= GFC_STD_F95_OBS | GFC_STD_F95_DEL
  95         | GFC_STD_GNU | GFC_STD_LEGACY;
  96       gfc_option.warn_std &= ~(GFC_STD_LEGACY | GFC_STD_F95_DEL);
  97     }
  98 }
  99
 100 /* Enable (or disable) -finit-local-zero.  */
 101
 102 static void
 103 set_init_local_zero (int value)
 104 {
 105   gfc_option.flag_init_integer_value = 0;
 106   gfc_option.flag_init_character_value = (char)0;
 107
 108   SET_FLAG (gfc_option.flag_init_integer, value, GFC_INIT_INTEGER_ON,
 109             GFC_INIT_INTEGER_OFF);
 110   SET_FLAG (gfc_option.flag_init_logical, value, GFC_INIT_LOGICAL_FALSE,
 111             GFC_INIT_LOGICAL_OFF);
 112   SET_FLAG (gfc_option.flag_init_character, value, GFC_INIT_CHARACTER_ON,
 113             GFC_INIT_CHARACTER_OFF);
 114   SET_FLAG (flag_init_real, value, GFC_INIT_REAL_ZERO, GFC_INIT_REAL_OFF);
 115 }
 116
 117 /* Return language mask for Fortran options.  */
 118
 119 unsigned int
 120 gfc_option_lang_mask (void)
 121 {
 122   return CL_Fortran;
 123 }
 124
 125 /* Initialize options structure OPTS.  */
 126
 127 void
 128 gfc_init_options_struct (struct gcc_options *opts)
 129 {
 130   opts->x_flag_errno_math = 0;
 131   opts->frontend_set_flag_errno_math = true;
 132   opts->x_flag_associative_math = -1;
 133   opts->frontend_set_flag_associative_math = true;
 134 }
 135
 136 /* Get ready for options handling. Keep in sync with
 137    libgfortran/runtime/compile_options.c (init_compile_options).  */
 138
 139 void
 140 gfc_init_options (unsigned int decoded_options_count,
 141                   struct cl_decoded_option *decoded_options)
 142 {
 143   gfc_source_file = NULL;
 144   gfc_option.module_dir = NULL;
 145   gfc_option.source_form = FORM_UNKNOWN;
 146   gfc_option.max_continue_fixed = 255;
 147   gfc_option.max_continue_free = 255;
 148   gfc_option.max_identifier_length = GFC_MAX_SYMBOL_LEN;
 149   gfc_option.max_errors = 25;
 150
 151   gfc_option.flag_preprocessed = 0;
 152   gfc_option.flag_d_lines = -1;
 153   set_init_local_zero (0);
 154
 155   gfc_option.fpe = 0;
 156   /* All except GFC_FPE_INEXACT.  */
 157   gfc_option.fpe_summary = GFC_FPE_INVALID | GFC_FPE_DENORMAL
 158                            | GFC_FPE_ZERO | GFC_FPE_OVERFLOW
 159                            | GFC_FPE_UNDERFLOW;
 160   gfc_option.rtcheck = 0;
 161
 162   set_dec_flags (0);
 163   set_default_std_flags ();
 164
 165   /* Initialize cpp-related options.  */
 166   gfc_cpp_init_options (decoded_options_count, decoded_options);
 167   gfc_diagnostics_init ();
 168 }
 169
 170
 171 /* Determine the source form from the filename extension.  We assume
 172    case insensitivity.  */
 173
 174 static gfc_source_form
 175 form_from_filename (const char *filename)
 176 {
 177   static const struct
 178   {
 179     const char *extension;
 180     gfc_source_form form;
 181   }
 182   exttype[] =
 183   {
 184     {
 185     ".f90", FORM_FREE}
 186     ,
 187     {
 188     ".f95", FORM_FREE}
 189     ,
 190     {
 191     ".f03", FORM_FREE}
 192     ,
 193     {
 194     ".f08", FORM_FREE}
 195     ,
 196     {
 197     ".f", FORM_FIXED}
 198     ,
 199     {
 200     ".for", FORM_FIXED}
 201     ,
 202     {
 203     ".ftn", FORM_FIXED}
 204     ,
 205     {
 206     "", FORM_UNKNOWN}
 207   };            /* sentinel value */
 208
 209   gfc_source_form f_form;
 210   const char *fileext;
 211   int i;
 212
 213   /* Find end of file name.  Note, filename is either a NULL pointer or
 214      a NUL terminated string.  */
 215   i = 0;
 216   while (filename[i] != '\0')
 217     i++;
 218
 219   /* Find last period.  */
 220   while (i >= 0 && (filename[i] != '.'))
 221     i--;
 222
 223   /* Did we see a file extension?  */
 224   if (i < 0)
 225     return FORM_UNKNOWN; /* Nope  */
 226
 227   /* Get file extension and compare it to others.  */
 228   fileext = &(filename[i]);
 229
 230   i = -1;
 231   f_form = FORM_UNKNOWN;
 232   do
 233     {
 234       i++;
 235       if (strcasecmp (fileext, exttype[i].extension) == 0)
 236         {
 237           f_form = exttype[i].form;
 238           break;
 239         }
 240     }
 241   while (exttype[i].form != FORM_UNKNOWN);
 242
 243   return f_form;
 244 }
 245
 246
 247 /* Finalize commandline options.  */
 248
 249 bool
 250 gfc_post_options (const char **pfilename)
 251 {
 252   const char *filename = *pfilename, *canon_source_file = NULL;
 253   char *source_path;
 254   bool verbose_missing_dir_warn;
 255   int i;
 256
 257   /* This needs to be after the commandline has been processed.
 258      In Fortran, the options is by default enabled, in C/C++
 259      by default disabled.
 260      If not enabled explicitly by the user, only warn for -I
 261      and -J, otherwise warn for all include paths.  */
 262   verbose_missing_dir_warn
 263     = (OPTION_SET_P (cpp_warn_missing_include_dirs)
 264        && global_options.x_cpp_warn_missing_include_dirs);
 265   SET_OPTION_IF_UNSET (&global_options, &global_options_set,
 266                        cpp_warn_missing_include_dirs, 1);
 267   gfc_check_include_dirs (verbose_missing_dir_warn);
 268
 269   /* Finalize DEC flags.  */
 270   post_dec_flags (flag_dec);
 271
 272   /* Excess precision other than "fast" requires front-end
 273      support.  */
 274   if (flag_excess_precision == EXCESS_PRECISION_STANDARD)
 275     sorry ("%<-fexcess-precision=standard%> for Fortran");
 276   else if (flag_excess_precision == EXCESS_PRECISION_FLOAT16)
 277     sorry ("%<-fexcess-precision=16%> for Fortran");
 278
 279   flag_excess_precision = 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 (flag_protect_parens == -1)
 287     flag_protect_parens = !optimize_fast;
 288
 289   /* -Ofast sets implies -fstack-arrays unless an explicit size is set for
 290      stack arrays.  */
 291   if (flag_stack_arrays == -1 && flag_max_stack_var_size == -2)
 292     flag_stack_arrays = optimize_fast;
 293
 294   /* By default, disable (re)allocation during assignment for -std=f95,
 295      and enable it for F2003/F2008/GNU/Legacy.  */
 296   if (flag_realloc_lhs == -1)
 297     {
 298       if (gfc_option.allow_std & GFC_STD_F2003)
 299         flag_realloc_lhs = 1;
 300       else
 301         flag_realloc_lhs = 0;
 302     }
 303
 304   /* -fbounds-check is equivalent to -fcheck=bounds */
 305   if (flag_bounds_check)
 306     gfc_option.rtcheck |= GFC_RTCHECK_BOUNDS;
 307
 308   if (flag_compare_debug)
 309     flag_dump_fortran_original = 0;
 310
 311   /* Make -fmax-errors visible to gfortran's diagnostic machinery.  */
 312   if (OPTION_SET_P (flag_max_errors))
 313     gfc_option.max_errors = flag_max_errors;
 314
 315   /* Verify the input file name.  */
 316   if (!filename || strcmp (filename, "-") == 0)
 317     {
 318       filename = "";
 319     }
 320
 321   if (gfc_option.flag_preprocessed)
 322     {
 323       /* For preprocessed files, if the first tokens are of the form # NUM.
 324          handle the directives so we know the original file name.  */
 325       gfc_source_file = gfc_read_orig_filename (filename, &canon_source_file);
 326       if (gfc_source_file == NULL)
 327         gfc_source_file = filename;
 328       else
 329         *pfilename = gfc_source_file;
 330     }
 331   else
 332     gfc_source_file = filename;
 333
 334   if (canon_source_file == NULL)
 335     canon_source_file = gfc_source_file;
 336
 337   /* Adds the path where the source file is to the list of include files.  */
 338
 339   i = strlen (canon_source_file);
 340   while (i > 0 && !IS_DIR_SEPARATOR (canon_source_file[i]))
 341     i--;
 342
 343   if (i != 0)
 344     {
 345       source_path = (char *) alloca (i + 1);
 346       memcpy (source_path, canon_source_file, i);
 347       source_path[i] = 0;
 348       /* Only warn if the directory is different from the input file as
 349          if that one is not found, already an error is shown.  */
 350       bool warn = gfc_option.flag_preprocessed && gfc_source_file != filename;
 351       gfc_add_include_path (source_path, true, true, warn, false);
 352     }
 353   else
 354     gfc_add_include_path (".", true, true, false, false);
 355
 356   if (canon_source_file != gfc_source_file)
 357     free (CONST_CAST (char *, canon_source_file));
 358
 359   /* Decide which form the file will be read in as.  */
 360
 361   if (gfc_option.source_form != FORM_UNKNOWN)
 362     gfc_current_form = gfc_option.source_form;
 363   else
 364     {
 365       gfc_current_form = form_from_filename (filename);
 366
 367       if (gfc_current_form == FORM_UNKNOWN)
 368         {
 369           gfc_current_form = FORM_FREE;
 370           main_input_filename = filename;
 371           gfc_warning_now (0, "Reading file %qs as free form",
 372                            (filename[0] == '\0') ? "<stdin>" : filename);
 373         }
 374     }
 375
 376   /* If the user specified -fd-lines-as-{code|comments} verify that we're
 377      in fixed form.  */
 378   if (gfc_current_form == FORM_FREE)
 379     {
 380       if (gfc_option.flag_d_lines == 0)
 381         gfc_warning_now (0, "%<-fd-lines-as-comments%> has no effect "
 382                            "in free form");
 383       else if (gfc_option.flag_d_lines == 1)
 384         gfc_warning_now (0, "%<-fd-lines-as-code%> has no effect in free form");
 385
 386       if (warn_line_truncation == -1)
 387           warn_line_truncation = 1;
 388
 389       /* Enable -Werror=line-truncation when -Werror and -Wno-error have
 390          not been set.  */
 391       if (warn_line_truncation && !OPTION_SET_P (warnings_are_errors)
 392           && option_unspecified_p (OPT_Wline_truncation))
 393         diagnostic_classify_diagnostic (global_dc, OPT_Wline_truncation,
 394                                         DK_ERROR, UNKNOWN_LOCATION);
 395     }
 396   else
 397     {
 398       /* With -fdec, set -fd-lines-as-comments by default in fixed form.  */
 399       if (flag_dec && gfc_option.flag_d_lines == -1)
 400         gfc_option.flag_d_lines = 0;
 401
 402       if (warn_line_truncation == -1)
 403         warn_line_truncation = 0;
 404     }
 405
 406   /* If -pedantic, warn about the use of GNU extensions.  */
 407   if (pedantic && (gfc_option.allow_std & GFC_STD_GNU) != 0)
 408     gfc_option.warn_std |= GFC_STD_GNU;
 409   /* -std=legacy -pedantic is effectively -std=gnu.  */
 410   if (pedantic && (gfc_option.allow_std & GFC_STD_LEGACY) != 0)
 411     gfc_option.warn_std |= GFC_STD_F95_OBS | GFC_STD_F95_DEL | GFC_STD_LEGACY;
 412
 413   /* If the user didn't explicitly specify -f(no)-second-underscore we
 414      use it if we're trying to be compatible with f2c, and not
 415      otherwise.  */
 416   if (flag_second_underscore == -1)
 417     flag_second_underscore = flag_f2c;
 418
 419   if (!flag_automatic && flag_max_stack_var_size != -2
 420       && flag_max_stack_var_size != 0)
 421     gfc_warning_now (0, "Flag %<-fno-automatic%> overwrites %<-fmax-stack-var-size=%d%>",
 422                      flag_max_stack_var_size);
 423   else if (!flag_automatic && flag_recursive)
 424     gfc_warning_now (OPT_Woverwrite_recursive, "Flag %<-fno-automatic%> "
 425                      "overwrites %<-frecursive%>");
 426   else if (!flag_automatic && (flag_openmp || flag_openacc))
 427     gfc_warning_now (0, "Flag %<-fno-automatic%> overwrites %<-frecursive%> "
 428                      "implied by %qs", flag_openmp ? "-fopenmp" : "-fopenacc");
 429   else if (flag_max_stack_var_size != -2 && flag_recursive)
 430     gfc_warning_now (0, "Flag %<-frecursive%> overwrites %<-fmax-stack-var-size=%d%>",
 431                      flag_max_stack_var_size);
 432   else if (flag_max_stack_var_size != -2 && (flag_openmp || flag_openacc))
 433     gfc_warning_now (0, "Flag %<-fmax-stack-var-size=%d%> overwrites "
 434                      "%<-frecursive%> implied by %qs", flag_max_stack_var_size,
 435                      flag_openmp ? "-fopenmp" : "-fopenacc");
 436
 437   /* Implement -frecursive as -fmax-stack-var-size=-1.  */
 438   if (flag_recursive)
 439     flag_max_stack_var_size = -1;
 440
 441   /* Implied -frecursive; implemented as -fmax-stack-var-size=-1.  */
 442   if (flag_max_stack_var_size == -2 && flag_automatic
 443       && (flag_openmp || flag_openacc))
 444     {
 445       flag_recursive = 1;
 446       flag_max_stack_var_size = -1;
 447     }
 448
 449   /* Set flag_stack_arrays correctly.  */
 450   if (flag_stack_arrays == -1)
 451     flag_stack_arrays = 0;
 452
 453   /* Set default.  */
 454   if (flag_max_stack_var_size == -2)
 455     flag_max_stack_var_size = 65536;
 456
 457   /* Implement -fno-automatic as -fmax-stack-var-size=0.  */
 458   if (!flag_automatic)
 459     flag_max_stack_var_size = 0;
 460
 461   /* If the user did not specify an inline matmul limit, inline up to the BLAS
 462      limit or up to 30 if no external BLAS is specified.  */
 463
 464   if (flag_inline_matmul_limit < 0)
 465     {
 466       if (flag_external_blas)
 467         flag_inline_matmul_limit = flag_blas_matmul_limit;
 468       else
 469         flag_inline_matmul_limit = 30;
 470     }
 471
 472   /* Optimization implies front end optimization, unless the user
 473      specified it directly.  */
 474
 475   if (flag_frontend_optimize == -1)
 476     flag_frontend_optimize = optimize && !optimize_debug;
 477
 478   /* Same for front end loop interchange.  */
 479
 480   if (flag_frontend_loop_interchange == -1)
 481     flag_frontend_loop_interchange = optimize;
 482
 483   /* Do inline packing by default if optimizing, but not if
 484      optimizing for size.  */
 485   if (flag_inline_arg_packing == -1)
 486     flag_inline_arg_packing = optimize && !optimize_size;
 487
 488   if (flag_max_array_constructor < 65535)
 489     flag_max_array_constructor = 65535;
 490
 491   if (flag_fixed_line_length != 0 && flag_fixed_line_length < 7)
 492     gfc_fatal_error ("Fixed line length must be at least seven");
 493
 494   if (flag_free_line_length != 0 && flag_free_line_length < 4)
 495     gfc_fatal_error ("Free line length must be at least three");
 496
 497   if (flag_max_subrecord_length > MAX_SUBRECORD_LENGTH)
 498     gfc_fatal_error ("Maximum subrecord length cannot exceed %d",
 499                      MAX_SUBRECORD_LENGTH);
 500
 501   gfc_cpp_post_options (verbose_missing_dir_warn);
 502
 503   if (gfc_option.allow_std & GFC_STD_F2008)
 504     lang_hooks.name = "GNU Fortran2008";
 505   else if (gfc_option.allow_std & GFC_STD_F2003)
 506     lang_hooks.name = "GNU Fortran2003";
 507
 508   return gfc_cpp_preprocess_only ();
 509 }
 510
 511
 512 static void
 513 gfc_handle_module_path_options (const char *arg)
 514 {
 515
 516   if (gfc_option.module_dir != NULL)
 517     gfc_fatal_error ("gfortran: Only one %<-J%> option allowed");
 518
 519   gfc_option.module_dir = XCNEWVEC (char, strlen (arg) + 2);
 520   strcpy (gfc_option.module_dir, arg);
 521
 522   gfc_add_include_path (gfc_option.module_dir, true, false, true, true);
 523
 524   strcat (gfc_option.module_dir, "/");
 525 }
 526
 527
 528 /* Handle options -ffpe-trap= and -ffpe-summary=.  */
 529
 530 static void
 531 gfc_handle_fpe_option (const char *arg, bool trap)
 532 {
 533   int result, pos = 0, n;
 534   /* precision is a backwards compatibility alias for inexact.  */
 535   static const char * const exception[] = { "invalid", "denormal", "zero",
 536                                             "overflow", "underflow",
 537                                             "inexact", "precision", NULL };
 538   static const int opt_exception[] = { GFC_FPE_INVALID, GFC_FPE_DENORMAL,
 539                                        GFC_FPE_ZERO, GFC_FPE_OVERFLOW,
 540                                        GFC_FPE_UNDERFLOW, GFC_FPE_INEXACT,
 541                                        GFC_FPE_INEXACT,
 542                                        0 };
 543
 544   /* As the default for -ffpe-summary= is nonzero, set it to 0.  */
 545   if (!trap)
 546     gfc_option.fpe_summary = 0;
 547
 548   while (*arg)
 549     {
 550       while (*arg == ',')
 551         arg++;
 552
 553       while (arg[pos] && arg[pos] != ',')
 554         pos++;
 555
 556       result = 0;
 557       if (strncmp ("none", arg, pos) == 0)
 558         {
 559           if (trap)
 560             gfc_option.fpe = 0;
 561           else
 562             gfc_option.fpe_summary = 0;
 563           arg += pos;
 564           pos = 0;
 565           continue;
 566         }
 567       else if (!trap && strncmp ("all", arg, pos) == 0)
 568         {
 569           gfc_option.fpe_summary = GFC_FPE_INVALID | GFC_FPE_DENORMAL
 570                                    | GFC_FPE_ZERO | GFC_FPE_OVERFLOW
 571                                    | GFC_FPE_UNDERFLOW | GFC_FPE_INEXACT;
 572           arg += pos;
 573           pos = 0;
 574           continue;
 575         }
 576       else
 577         for (n = 0; exception[n] != NULL; n++)
 578           {
 579           if (exception[n] && strncmp (exception[n], arg, pos) == 0)
 580             {
 581               if (trap)
 582                 gfc_option.fpe |= opt_exception[n];
 583               else
 584                 gfc_option.fpe_summary |= opt_exception[n];
 585               arg += pos;
 586               pos = 0;
 587               result = 1;
 588               break;
 589             }
 590           }
 591       if (!result && trap)
 592         gfc_fatal_error ("Argument to %<-ffpe-trap%> is not valid: %s", arg);
 593       else if (!result)
 594         gfc_fatal_error ("Argument to %<-ffpe-summary%> is not valid: %s", arg);
 595
 596     }
 597 }
 598
 599
 600 static void
 601 gfc_handle_runtime_check_option (const char *arg)
 602 {
 603   int result, pos = 0, n;
 604   static const char * const optname[] = { "all", "bounds", "array-temps",
 605                                           "recursion", "do", "pointer",
 606                                           "mem", "bits", NULL };
 607   static const int optmask[] = { GFC_RTCHECK_ALL, GFC_RTCHECK_BOUNDS,
 608                                  GFC_RTCHECK_ARRAY_TEMPS,
 609                                  GFC_RTCHECK_RECURSION, GFC_RTCHECK_DO,
 610                                  GFC_RTCHECK_POINTER, GFC_RTCHECK_MEM,
 611                                  GFC_RTCHECK_BITS, 0 };
 612
 613   while (*arg)
 614     {
 615       while (*arg == ',')
 616         arg++;
 617
 618       while (arg[pos] && arg[pos] != ',')
 619         pos++;
 620
 621       result = 0;
 622       for (n = 0; optname[n] != NULL; n++)
 623         {
 624           if (optname[n] && strncmp (optname[n], arg, pos) == 0)
 625             {
 626               gfc_option.rtcheck |= optmask[n];
 627               arg += pos;
 628               pos = 0;
 629               result = 1;
 630               break;
 631             }
 632           else if (optname[n] && pos > 3 && startswith (arg, "no-")
 633                    && strncmp (optname[n], arg+3, pos-3) == 0)
 634             {
 635               gfc_option.rtcheck &= ~optmask[n];
 636               arg += pos;
 637               pos = 0;
 638               result = 1;
 639               break;
 640             }
 641         }
 642       if (!result)
 643         gfc_fatal_error ("Argument to %<-fcheck%> is not valid: %s", arg);
 644     }
 645 }
 646
 647
 648 /* Handle command-line options.  Returns 0 if unrecognized, 1 if
 649    recognized and handled.  */
 650
 651 bool
 652 gfc_handle_option (size_t scode, const char *arg, HOST_WIDE_INT value,
 653                    int kind ATTRIBUTE_UNUSED, location_t loc ATTRIBUTE_UNUSED,
 654                    const struct cl_option_handlers *handlers ATTRIBUTE_UNUSED)
 655 {
 656   bool result = true;
 657   enum opt_code code = (enum opt_code) scode;
 658
 659   if (gfc_cpp_handle_option (scode, arg, value) == 1)
 660     return true;
 661
 662   switch (code)
 663     {
 664     default:
 665       if (cl_options[code].flags & gfc_option_lang_mask ())
 666         break;
 667       result = false;
 668       break;
 669
 670     case OPT_fcheck_array_temporaries:
 671       SET_BITFLAG (gfc_option.rtcheck, value, GFC_RTCHECK_ARRAY_TEMPS);
 672       break;
 673
 674     case OPT_fd_lines_as_code:
 675       gfc_option.flag_d_lines = 1;
 676       break;
 677
 678     case OPT_fd_lines_as_comments:
 679       gfc_option.flag_d_lines = 0;
 680       break;
 681
 682     case OPT_ffixed_form:
 683       gfc_option.source_form = FORM_FIXED;
 684       break;
 685
 686     case OPT_ffree_form:
 687       gfc_option.source_form = FORM_FREE;
 688       break;
 689
 690     case OPT_fintrinsic_modules_path:
 691     case OPT_fintrinsic_modules_path_:
 692
 693       /* This is needed because omp_lib.h is in a directory together
 694          with intrinsic modules.  Do no warn because during testing
 695          without an installed compiler, we would get lots of bogus
 696          warnings for a missing include directory.  */
 697       gfc_add_include_path (arg, false, false, false, true);
 698
 699       gfc_add_intrinsic_modules_path (arg);
 700       break;
 701
 702     case OPT_fpreprocessed:
 703       gfc_option.flag_preprocessed = value;
 704       break;
 705
 706     case OPT_fmax_identifier_length_:
 707       if (value > GFC_MAX_SYMBOL_LEN)
 708         gfc_fatal_error ("Maximum supported identifier length is %d",
 709                          GFC_MAX_SYMBOL_LEN);
 710       gfc_option.max_identifier_length = value;
 711       break;
 712
 713     case OPT_finit_local_zero:
 714       set_init_local_zero (value);
 715       break;
 716
 717     case OPT_finit_logical_:
 718       if (!strcasecmp (arg, "false"))
 719         gfc_option.flag_init_logical = GFC_INIT_LOGICAL_FALSE;
 720       else if (!strcasecmp (arg, "true"))
 721         gfc_option.flag_init_logical = GFC_INIT_LOGICAL_TRUE;
 722       else
 723         gfc_fatal_error ("Unrecognized option to %<-finit-logical%>: %s",
 724                          arg);
 725       break;
 726
 727     case OPT_finit_integer_:
 728       gfc_option.flag_init_integer = GFC_INIT_INTEGER_ON;
 729       gfc_option.flag_init_integer_value = strtol (arg, NULL, 10);
 730       break;
 731
 732     case OPT_finit_character_:
 733       if (value >= 0 && value <= 127)
 734         {
 735           gfc_option.flag_init_character = GFC_INIT_CHARACTER_ON;
 736           gfc_option.flag_init_character_value = (char)value;
 737         }
 738       else
 739         gfc_fatal_error ("The value of n in %<-finit-character=n%> must be "
 740                          "between 0 and 127");
 741       break;
 742
 743     case OPT_I:
 744       gfc_add_include_path (arg, true, false, true, true);
 745       break;
 746
 747     case OPT_J:
 748       gfc_handle_module_path_options (arg);
 749       break;
 750
 751     case OPT_ffpe_trap_:
 752       gfc_handle_fpe_option (arg, true);
 753       break;
 754
 755     case OPT_ffpe_summary_:
 756       gfc_handle_fpe_option (arg, false);
 757       break;
 758
 759     case OPT_std_f95:
 760       gfc_option.allow_std = GFC_STD_OPT_F95;
 761       gfc_option.warn_std = GFC_STD_F95_OBS;
 762       gfc_option.max_continue_fixed = 19;
 763       gfc_option.max_continue_free = 39;
 764       gfc_option.max_identifier_length = 31;
 765       warn_ampersand = 1;
 766       warn_tabs = 1;
 767       break;
 768
 769     case OPT_std_f2003:
 770       gfc_option.allow_std = GFC_STD_OPT_F03;
 771       gfc_option.warn_std = GFC_STD_F95_OBS;
 772       gfc_option.max_identifier_length = 63;
 773       warn_ampersand = 1;
 774       warn_tabs = 1;
 775       break;
 776
 777     case OPT_std_f2008:
 778       gfc_option.allow_std = GFC_STD_OPT_F08;
 779       gfc_option.warn_std = GFC_STD_F95_OBS | GFC_STD_F2008_OBS;
 780       gfc_option.max_identifier_length = 63;
 781       warn_ampersand = 1;
 782       warn_tabs = 1;
 783       break;
 784
 785     case OPT_std_f2008ts:
 786     case OPT_std_f2018:
 787       gfc_option.allow_std = GFC_STD_OPT_F18;
 788       gfc_option.warn_std = GFC_STD_F95_OBS | GFC_STD_F2008_OBS
 789         | GFC_STD_F2018_OBS;
 790       gfc_option.max_identifier_length = 63;
 791       warn_ampersand = 1;
 792       warn_tabs = 1;
 793       break;
 794
 795     case OPT_std_gnu:
 796       set_default_std_flags ();
 797       break;
 798
 799     case OPT_std_legacy:
 800       set_default_std_flags ();
 801       gfc_option.warn_std = 0;
 802       break;
 803
 804     case OPT_fshort_enums:
 805       /* Handled in language-independent code.  */
 806       break;
 807
 808     case OPT_fcheck_:
 809       gfc_handle_runtime_check_option (arg);
 810       break;
 811
 812     case OPT_fdec:
 813       /* Set (or unset) the DEC extension flags.  */
 814       set_dec_flags (value);
 815       break;
 816     }
 817
 818   Fortran_handle_option_auto (&global_options, &global_options_set,
 819                               scode, arg, value,
 820                               gfc_option_lang_mask (), kind,
 821                               loc, handlers, global_dc);
 822   return result;
 823 }
 824
 825
 826 /* Return a string with the options passed to the compiler; used for
 827    Fortran's compiler_options() intrinsic.  */
 828
 829 char *
 830 gfc_get_option_string (void)
 831 {
 832   unsigned j;
 833   size_t len, pos;
 834   char *result;
 835
 836   /* Allocate and return a one-character string with '\0'.  */
 837   if (!save_decoded_options_count)
 838     return XCNEWVEC (char, 1);
 839
 840   /* Determine required string length.  */
 841
 842   len = 0;
 843   for (j = 1; j < save_decoded_options_count; j++)
 844     {
 845       switch (save_decoded_options[j].opt_index)
 846         {
 847         case OPT_o:
 848         case OPT_d:
 849         case OPT_dumpbase:
 850         case OPT_dumpbase_ext:
 851         case OPT_dumpdir:
 852         case OPT_quiet:
 853         case OPT_version:
 854         case OPT_fintrinsic_modules_path:
 855         case OPT_fintrinsic_modules_path_:
 856           /* Ignore these.  */
 857           break;
 858         default:
 859           /* Ignore file names.  */
 860           if (save_decoded_options[j].orig_option_with_args_text[0] == '-')
 861             len += 1
 862                  + strlen (save_decoded_options[j].orig_option_with_args_text);
 863         }
 864     }
 865
 866   result = XCNEWVEC (char, len);
 867
 868   pos = 0;
 869   for (j = 1; j < save_decoded_options_count; j++)
 870     {
 871       switch (save_decoded_options[j].opt_index)
 872         {
 873         case OPT_o:
 874         case OPT_d:
 875         case OPT_dumpbase:
 876         case OPT_dumpbase_ext:
 877         case OPT_dumpdir:
 878         case OPT_quiet:
 879         case OPT_version:
 880         case OPT_fintrinsic_modules_path:
 881         case OPT_fintrinsic_modules_path_:
 882           /* Ignore these.  */
 883           continue;
 884
 885         case OPT_cpp_:
 886           /* Use "-cpp" rather than "-cpp=<temporary file>".  */
 887           len = 4;
 888           break;
 889
 890         default:
 891           /* Ignore file names.  */
 892           if (save_decoded_options[j].orig_option_with_args_text[0] != '-')
 893             continue;
 894
 895           len = strlen (save_decoded_options[j].orig_option_with_args_text);
 896         }
 897
 898       memcpy (&result[pos], save_decoded_options[j].orig_option_with_args_text, len);
 899       pos += len;
 900       result[pos++] = ' ';
 901     }
 902
 903   result[--pos] = '\0';
 904   return result;
 905 }
 906
 907 #undef SET_BITFLAG
 908 #undef SET_BITFLAG2
 909 #undef SET_FLAG