gcc/fortran/options.c

   1 /* Parse and display command line options.
   2    Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation,
   3    Inc.
   4    Contributed by Andy Vaught
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 2, or (at your option) any later
  11 version.
  12
  13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING.  If not, write to the Free
  20 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
  21 02110-1301, USA.  */
  22
  23
  24 #include "config.h"
  25 #include "system.h"
  26 #include "coretypes.h"
  27 #include "tree.h"
  28 #include "flags.h"
  29 #include "intl.h"
  30 #include "opts.h"
  31 #include "options.h"
  32 #include "tree-inline.h"
  33
  34 #include "gfortran.h"
  35
  36 gfc_option_t gfc_option;
  37
  38
  39 /* Get ready for options handling.  */
  40
  41 unsigned int
  42 gfc_init_options (unsigned int argc ATTRIBUTE_UNUSED,
  43                   const char **argv ATTRIBUTE_UNUSED)
  44 {
  45   gfc_source_file = NULL;
  46   gfc_option.module_dir = NULL;
  47   gfc_option.source_form = FORM_UNKNOWN;
  48   gfc_option.fixed_line_length = 72;
  49   gfc_option.max_identifier_length = GFC_MAX_SYMBOL_LEN;
  50   gfc_option.verbose = 0;
  51
  52   gfc_option.warn_aliasing = 0;
  53   gfc_option.warn_conversion = 0;
  54   gfc_option.warn_implicit_interface = 0;
  55   gfc_option.warn_line_truncation = 0;
  56   gfc_option.warn_underflow = 1;
  57   gfc_option.warn_surprising = 0;
  58   gfc_option.warn_unused_labels = 0;
  59
  60   gfc_option.flag_default_double = 0;
  61   gfc_option.flag_default_integer = 0;
  62   gfc_option.flag_default_real = 0;
  63   gfc_option.flag_dollar_ok = 0;
  64   gfc_option.flag_underscoring = 1;
  65   gfc_option.flag_f2c = 0;
  66   gfc_option.flag_second_underscore = -1;
  67   gfc_option.flag_implicit_none = 0;
  68   gfc_option.flag_max_stack_var_size = 32768;
  69   gfc_option.flag_module_access_private = 0;
  70   gfc_option.flag_no_backend = 0;
  71   gfc_option.flag_pack_derived = 0;
  72   gfc_option.flag_repack_arrays = 0;
  73   gfc_option.flag_automatic = 1;
  74   gfc_option.flag_backslash = 1;
  75   gfc_option.flag_d_lines = -1;
  76
  77   gfc_option.q_kind = gfc_default_double_kind;
  78
  79   flag_argument_noalias = 2;
  80   flag_errno_math = 0;
  81
  82   gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL
  83     | GFC_STD_F2003 | GFC_STD_F95 | GFC_STD_F77 | GFC_STD_GNU
  84     | GFC_STD_LEGACY;
  85   gfc_option.warn_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL
  86     | GFC_STD_F2003 | GFC_STD_LEGACY;
  87
  88   gfc_option.warn_nonstd_intrinsics = 0;
  89
  90   return CL_Fortran;
  91 }
  92
  93
  94 /* Determine the source form from the filename extension.  We assume
  95    case insensitivity.  */
  96
  97 static gfc_source_form
  98 form_from_filename (const char *filename)
  99 {
 100
 101   static const struct
 102   {
 103     const char *extension;
 104     gfc_source_form form;
 105   }
 106   exttype[] =
 107   {
 108     {
 109     ".f90", FORM_FREE}
 110     ,
 111     {
 112     ".f95", FORM_FREE}
 113     ,
 114     {
 115     ".f", FORM_FIXED}
 116     ,
 117     {
 118     ".for", FORM_FIXED}
 119     ,
 120     {
 121     "", FORM_UNKNOWN}
 122   };            /* sentinel value */
 123
 124   gfc_source_form f_form;
 125   const char *fileext;
 126   int i;
 127
 128   /* Find end of file name.  Note, filename is either a NULL pointer or
 129      a NUL terminated string.  */
 130   i = 0;
 131   while (filename[i] != '\0')
 132     i++;
 133
 134   /* Find last period.  */
 135   while (i >= 0 && (filename[i] != '.'))
 136     i--;
 137
 138   /* Did we see a file extension?  */
 139   if (i < 0)
 140     return FORM_UNKNOWN; /* Nope  */
 141
 142   /* Get file extension and compare it to others.  */
 143   fileext = &(filename[i]);
 144
 145   i = -1;
 146   f_form = FORM_UNKNOWN;
 147   do
 148     {
 149       i++;
 150       if (strcasecmp (fileext, exttype[i].extension) == 0)
 151         {
 152           f_form = exttype[i].form;
 153           break;
 154         }
 155     }
 156   while (exttype[i].form != FORM_UNKNOWN);
 157
 158   return f_form;
 159 }
 160
 161
 162 /* Finalize commandline options.  */
 163
 164 bool
 165 gfc_post_options (const char **pfilename)
 166 {
 167   const char *filename = *pfilename;
 168
 169   /* Verify the input file name.  */
 170   if (!filename || strcmp (filename, "-") == 0)
 171     {
 172       filename = "";
 173     }
 174
 175   gfc_source_file = filename;
 176
 177   /* Decide which form the file will be read in as.  */
 178
 179   if (gfc_option.source_form != FORM_UNKNOWN)
 180     gfc_current_form = gfc_option.source_form;
 181   else
 182     {
 183       gfc_current_form = form_from_filename (filename);
 184
 185       if (gfc_current_form == FORM_UNKNOWN)
 186         {
 187           gfc_current_form = FORM_FREE;
 188           gfc_warning_now ("Reading file '%s' as free form.",
 189                            (filename[0] == '\0') ? "<stdin>" : filename);
 190         }
 191     }
 192
 193   /* If the user specified -fd-lines-as-{code|comments} verify that we're
 194      in fixed form.  */
 195   if (gfc_current_form == FORM_FREE)
 196     {
 197       if (gfc_option.flag_d_lines == 0)
 198         gfc_warning_now ("'-fd-lines-as-comments' has no effect "
 199                          "in free form.");
 200       else if (gfc_option.flag_d_lines == 1)
 201         gfc_warning_now ("'-fd-lines-as-code' has no effect "
 202                          "in free form.");
 203     }
 204
 205   flag_inline_trees = 1;
 206
 207   /* Use tree inlining.  */
 208   if (!flag_no_inline)
 209     flag_no_inline = 1;
 210   if (flag_inline_functions)
 211     flag_inline_trees = 2;
 212
 213   /* If -pedantic, warn about the use of GNU extensions.  */
 214   if (pedantic && (gfc_option.allow_std & GFC_STD_GNU) != 0)
 215     gfc_option.warn_std |= GFC_STD_GNU;
 216   /* -std=legacy -pedantic is effectively -std=gnu.  */
 217   if (pedantic && (gfc_option.allow_std & GFC_STD_LEGACY) != 0)
 218     gfc_option.warn_std |= GFC_STD_F95_OBS | GFC_STD_F95_DEL | GFC_STD_LEGACY;
 219
 220   /* If the user didn't explicitly specify -f(no)-second-underscore we
 221      use it if we're trying to be compatible with f2c, and not
 222      otherwise.  */
 223   if (gfc_option.flag_second_underscore == -1)
 224     gfc_option.flag_second_underscore = gfc_option.flag_f2c;
 225
 226   /* Implement -fno-automatic as -fmax-stack-var-size=0.  */
 227   if (!gfc_option.flag_automatic)
 228     gfc_option.flag_max_stack_var_size = 0;
 229
 230   return false;
 231 }
 232
 233
 234 /* Set the options for -Wall.  */
 235
 236 static void
 237 set_Wall (void)
 238 {
 239
 240   gfc_option.warn_aliasing = 1;
 241   gfc_option.warn_line_truncation = 1;
 242   gfc_option.warn_underflow = 1;
 243   gfc_option.warn_surprising = 1;
 244   gfc_option.warn_unused_labels = 1;
 245   gfc_option.warn_nonstd_intrinsics = 1;
 246
 247   set_Wunused (1);
 248   warn_return_type = 1;
 249   warn_switch = 1;
 250
 251   /* We save the value of warn_uninitialized, since if they put
 252      -Wuninitialized on the command line, we need to generate a
 253      warning about not using it without also specifying -O.  */
 254
 255   if (warn_uninitialized != 1)
 256     warn_uninitialized = 2;
 257 }
 258
 259
 260 static void
 261 gfc_handle_module_path_options (const char *arg)
 262 {
 263
 264   if (gfc_option.module_dir != NULL)
 265     {
 266       gfc_status ("gfortran: Only one -M option allowed\n");
 267       exit (3);
 268     }
 269
 270   if (arg == NULL)
 271     {
 272       gfc_status ("gfortran: Directory required after -M\n");
 273       exit (3);
 274     }
 275
 276   gfc_option.module_dir = (char *) gfc_getmem (strlen (arg) + 2);
 277   strcpy (gfc_option.module_dir, arg);
 278   strcat (gfc_option.module_dir, "/");
 279 }
 280
 281 /* Handle command-line options.  Returns 0 if unrecognized, 1 if
 282    recognized and handled.  */
 283 int
 284 gfc_handle_option (size_t scode, const char *arg, int value)
 285 {
 286   int result = 1;
 287   enum opt_code code = (enum opt_code) scode;
 288
 289   /* Ignore file names.  */
 290   if (code == N_OPTS)
 291     return 1;
 292
 293   switch (code)
 294     {
 295     default:
 296       result = 0;
 297       break;
 298
 299     case OPT_Wall:
 300       set_Wall ();
 301       break;
 302
 303     case OPT_Waliasing:
 304       gfc_option.warn_aliasing = value;
 305       break;
 306
 307     case OPT_Wconversion:
 308       gfc_option.warn_conversion = value;
 309       break;
 310
 311     case OPT_Wimplicit_interface:
 312       gfc_option.warn_implicit_interface = value;
 313       break;
 314
 315     case OPT_Wline_truncation:
 316       gfc_option.warn_line_truncation = value;
 317       break;
 318
 319     case OPT_Wunderflow:
 320       gfc_option.warn_underflow = value;
 321       break;
 322
 323     case OPT_Wsurprising:
 324       gfc_option.warn_surprising = value;
 325       break;
 326
 327     case OPT_Wunused_labels:
 328       gfc_option.warn_unused_labels = value;
 329       break;
 330
 331     case OPT_ff2c:
 332       gfc_option.flag_f2c = value;
 333       break;
 334
 335     case OPT_fdollar_ok:
 336       gfc_option.flag_dollar_ok = value;
 337       break;
 338
 339     case OPT_fautomatic:
 340       gfc_option.flag_automatic = value;
 341       break;
 342
 343     case OPT_fbackslash:
 344       gfc_option.flag_backslash = value;
 345       break;
 346
 347     case OPT_fd_lines_as_code:
 348       gfc_option.flag_d_lines = 1;
 349       break;
 350
 351     case OPT_fd_lines_as_comments:
 352       gfc_option.flag_d_lines = 0;
 353       break;
 354
 355     case OPT_fdump_parse_tree:
 356       gfc_option.verbose = value;
 357       break;
 358
 359     case OPT_ffixed_form:
 360       gfc_option.source_form = FORM_FIXED;
 361       break;
 362
 363     case OPT_ffree_form:
 364       gfc_option.source_form = FORM_FREE;
 365       break;
 366
 367     case OPT_funderscoring:
 368       gfc_option.flag_underscoring = value;
 369       break;
 370
 371     case OPT_fsecond_underscore:
 372       gfc_option.flag_second_underscore = value;
 373       break;
 374
 375     case OPT_fimplicit_none:
 376       gfc_option.flag_implicit_none = value;
 377       break;
 378
 379     case OPT_fmax_stack_var_size_:
 380       gfc_option.flag_max_stack_var_size = value;
 381       break;
 382
 383     case OPT_fmodule_private:
 384       gfc_option.flag_module_access_private = value;
 385       break;
 386
 387     case OPT_fno_backend:
 388       gfc_option.flag_no_backend = value;
 389       break;
 390
 391     case OPT_fpack_derived:
 392       gfc_option.flag_pack_derived = value;
 393       break;
 394
 395     case OPT_frepack_arrays:
 396       gfc_option.flag_repack_arrays = value;
 397       break;
 398
 399     case OPT_ffixed_line_length_none:
 400       gfc_option.fixed_line_length = 0;
 401       break;
 402
 403     case OPT_ffixed_line_length_:
 404       if (value != 0 && value < 7)
 405         gfc_fatal_error ("Fixed line length must be at least seven.");
 406       gfc_option.fixed_line_length = value;
 407       break;
 408
 409     case OPT_fmax_identifier_length_:
 410       if (value > GFC_MAX_SYMBOL_LEN)
 411         gfc_fatal_error ("Maximum supported idenitifier length is %d",
 412                          GFC_MAX_SYMBOL_LEN);
 413       gfc_option.max_identifier_length = value;
 414       break;
 415
 416     case OPT_qkind_:
 417       if (gfc_validate_kind (BT_REAL, value, true) < 0)
 418         gfc_fatal_error ("Argument to -fqkind isn't a valid real kind");
 419       gfc_option.q_kind = value;
 420       break;
 421
 422     case OPT_fdefault_integer_8:
 423       gfc_option.flag_default_integer = value;
 424       break;
 425
 426     case OPT_fdefault_real_8:
 427       gfc_option.flag_default_real = value;
 428       break;
 429
 430     case OPT_fdefault_double_8:
 431       gfc_option.flag_default_double = value;
 432       break;
 433
 434     case OPT_I:
 435       gfc_add_include_path (arg);
 436       break;
 437
 438     case OPT_J:
 439     case OPT_M:
 440       gfc_handle_module_path_options (arg);
 441       break;
 442
 443     case OPT_std_f95:
 444       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F95 | GFC_STD_F77;
 445       gfc_option.warn_std = GFC_STD_F95_OBS;
 446       gfc_option.max_identifier_length = 31;
 447       break;
 448
 449     case OPT_std_f2003:
 450       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F77
 451         | GFC_STD_F2003 | GFC_STD_F95;
 452       gfc_option.warn_std = GFC_STD_F95_OBS;
 453       gfc_option.max_identifier_length = 63;
 454       break;
 455
 456     case OPT_std_gnu:
 457       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL
 458         | GFC_STD_F77 | GFC_STD_F95 | GFC_STD_F2003
 459         | GFC_STD_GNU | GFC_STD_LEGACY;
 460       gfc_option.warn_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL
 461         | GFC_STD_LEGACY;
 462       break;
 463
 464     case OPT_std_legacy:
 465       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL
 466         | GFC_STD_F77 | GFC_STD_F95 | GFC_STD_F2003
 467         | GFC_STD_GNU | GFC_STD_LEGACY;
 468       gfc_option.warn_std = 0;
 469       break;
 470
 471     case OPT_Wnonstd_intrinsics:
 472       gfc_option.warn_nonstd_intrinsics = 1;
 473       break;
 474     }
 475
 476   return result;
 477 }