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_option.source = 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_backslash = 1;
  74
  75   gfc_option.q_kind = gfc_default_double_kind;
  76
  77   flag_argument_noalias = 2;
  78   flag_errno_math = 0;
  79
  80   gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL
  81     | GFC_STD_F2003 | GFC_STD_F95 | GFC_STD_F77 | GFC_STD_GNU
  82     | GFC_STD_LEGACY;
  83   gfc_option.warn_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL
  84     | GFC_STD_F2003 | GFC_STD_LEGACY;
  85
  86   gfc_option.warn_nonstd_intrinsics = 0;
  87
  88   return CL_F95;
  89 }
  90
  91
  92 /* Finalize commandline options.  */
  93
  94 bool
  95 gfc_post_options (const char **pfilename)
  96 {
  97   const char *filename = *pfilename;
  98
  99   /* Verify the input file name.  */
 100   if (!filename || strcmp (filename, "-") == 0)
 101     {
 102       filename = "";
 103     }
 104
 105   gfc_option.source = filename;
 106
 107   flag_inline_trees = 1;
 108
 109   /* Use tree inlining.  */
 110   if (!flag_no_inline)
 111     flag_no_inline = 1;
 112   if (flag_inline_functions)
 113     flag_inline_trees = 2;
 114
 115   /* If -pedantic, warn about the use of GNU extensions.  */
 116   if (pedantic && (gfc_option.allow_std & GFC_STD_GNU) != 0)
 117     gfc_option.warn_std |= GFC_STD_GNU;
 118   /* -std=legacy -pedantic is effectively -std=gnu.  */
 119   if (pedantic && (gfc_option.allow_std & GFC_STD_LEGACY) != 0)
 120     gfc_option.warn_std |= GFC_STD_F95_OBS | GFC_STD_F95_DEL | GFC_STD_LEGACY;
 121
 122   /* If the user didn't explicitly specify -f(no)-second-underscore we
 123      use it if we're trying to be compatible with f2c, and not
 124      otherwise.  */
 125   if (gfc_option.flag_second_underscore == -1)
 126     gfc_option.flag_second_underscore = gfc_option.flag_f2c;
 127
 128   return false;
 129 }
 130
 131
 132 /* Set the options for -Wall.  */
 133
 134 static void
 135 set_Wall (void)
 136 {
 137
 138   gfc_option.warn_aliasing = 1;
 139   gfc_option.warn_line_truncation = 1;
 140   gfc_option.warn_underflow = 1;
 141   gfc_option.warn_surprising = 1;
 142   gfc_option.warn_unused_labels = 1;
 143   gfc_option.warn_nonstd_intrinsics = 1;
 144
 145   set_Wunused (1);
 146   warn_return_type = 1;
 147   warn_switch = 1;
 148
 149   /* We save the value of warn_uninitialized, since if they put
 150      -Wuninitialized on the command line, we need to generate a
 151      warning about not using it without also specifying -O.  */
 152
 153   if (warn_uninitialized != 1)
 154     warn_uninitialized = 2;
 155 }
 156
 157
 158 static void
 159 gfc_handle_module_path_options (const char *arg)
 160 {
 161
 162   if (gfc_option.module_dir != NULL)
 163     {
 164       gfc_status ("gfortran: Only one -M option allowed\n");
 165       exit (3);
 166     }
 167
 168   if (arg == NULL)
 169     {
 170       gfc_status ("gfortran: Directory required after -M\n");
 171       exit (3);
 172     }
 173
 174   gfc_option.module_dir = (char *) gfc_getmem (strlen (arg) + 2);
 175   strcpy (gfc_option.module_dir, arg);
 176   strcat (gfc_option.module_dir, "/");
 177 }
 178
 179 /* Handle command-line options.  Returns 0 if unrecognized, 1 if
 180    recognized and handled.  */
 181 int
 182 gfc_handle_option (size_t scode, const char *arg, int value)
 183 {
 184   int result = 1;
 185   enum opt_code code = (enum opt_code) scode;
 186
 187   /* Ignore file names.  */
 188   if (code == N_OPTS)
 189     return 1;
 190
 191   switch (code)
 192     {
 193     default:
 194       result = 0;
 195       break;
 196
 197     case OPT_Wall:
 198       set_Wall ();
 199       break;
 200
 201     case OPT_Waliasing:
 202       gfc_option.warn_aliasing = value;
 203       break;
 204
 205     case OPT_Wconversion:
 206       gfc_option.warn_conversion = value;
 207       break;
 208
 209     case OPT_Wimplicit_interface:
 210       gfc_option.warn_implicit_interface = value;
 211       break;
 212
 213     case OPT_Wline_truncation:
 214       gfc_option.warn_line_truncation = value;
 215       break;
 216
 217     case OPT_Wunderflow:
 218       gfc_option.warn_underflow = value;
 219       break;
 220
 221     case OPT_Wsurprising:
 222       gfc_option.warn_surprising = value;
 223       break;
 224
 225     case OPT_Wunused_labels:
 226       gfc_option.warn_unused_labels = value;
 227       break;
 228
 229     case OPT_ff2c:
 230       gfc_option.flag_f2c = value;
 231       break;
 232
 233     case OPT_fdollar_ok:
 234       gfc_option.flag_dollar_ok = value;
 235       break;
 236
 237     case OPT_fbackslash:
 238       gfc_option.flag_backslash = value;
 239       break;
 240
 241     case OPT_fdump_parse_tree:
 242       gfc_option.verbose = value;
 243       break;
 244
 245     case OPT_ffixed_form:
 246       gfc_option.source_form = FORM_FIXED;
 247       break;
 248
 249     case OPT_ffree_form:
 250       gfc_option.source_form = FORM_FREE;
 251       break;
 252
 253     case OPT_funderscoring:
 254       gfc_option.flag_underscoring = value;
 255       break;
 256
 257     case OPT_fsecond_underscore:
 258       gfc_option.flag_second_underscore = value;
 259       break;
 260
 261     case OPT_fimplicit_none:
 262       gfc_option.flag_implicit_none = value;
 263       break;
 264
 265     case OPT_fmax_stack_var_size_:
 266       gfc_option.flag_max_stack_var_size = value;
 267       break;
 268
 269     case OPT_fmodule_private:
 270       gfc_option.flag_module_access_private = value;
 271       break;
 272
 273     case OPT_fno_backend:
 274       gfc_option.flag_no_backend = value;
 275       break;
 276
 277     case OPT_fpack_derived:
 278       gfc_option.flag_pack_derived = value;
 279       break;
 280
 281     case OPT_frepack_arrays:
 282       gfc_option.flag_repack_arrays = value;
 283       break;
 284
 285     case OPT_ffixed_line_length_none:
 286       gfc_option.fixed_line_length = 0;
 287       break;
 288
 289     case OPT_ffixed_line_length_:
 290       if (value != 0 && value < 7)
 291         gfc_fatal_error ("Fixed line length must be at least seven.");
 292       gfc_option.fixed_line_length = value;
 293       break;
 294
 295     case OPT_fmax_identifier_length_:
 296       if (value > GFC_MAX_SYMBOL_LEN)
 297         gfc_fatal_error ("Maximum supported idenitifier length is %d",
 298                          GFC_MAX_SYMBOL_LEN);
 299       gfc_option.max_identifier_length = value;
 300       break;
 301
 302     case OPT_qkind_:
 303       if (gfc_validate_kind (BT_REAL, value, true) < 0)
 304         gfc_fatal_error ("Argument to -fqkind isn't a valid real kind");
 305       gfc_option.q_kind = value;
 306       break;
 307
 308     case OPT_fdefault_integer_8:
 309       gfc_option.flag_default_integer = value;
 310       break;
 311
 312     case OPT_fdefault_real_8:
 313       gfc_option.flag_default_real = value;
 314       break;
 315
 316     case OPT_fdefault_double_8:
 317       gfc_option.flag_default_double = value;
 318       break;
 319
 320     case OPT_I:
 321       gfc_add_include_path (arg);
 322       break;
 323
 324     case OPT_J:
 325     case OPT_M:
 326       gfc_handle_module_path_options (arg);
 327       break;
 328
 329     case OPT_std_f95:
 330       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F95 | GFC_STD_F77;
 331       gfc_option.warn_std = GFC_STD_F95_OBS;
 332       gfc_option.max_identifier_length = 31;
 333       break;
 334
 335     case OPT_std_f2003:
 336       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F77
 337         | GFC_STD_F2003 | GFC_STD_F95;
 338       gfc_option.warn_std = GFC_STD_F95_OBS;
 339       gfc_option.max_identifier_length = 63;
 340       break;
 341
 342     case OPT_std_gnu:
 343       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL
 344         | GFC_STD_F77 | GFC_STD_F95 | GFC_STD_F2003
 345         | GFC_STD_GNU | GFC_STD_LEGACY;
 346       gfc_option.warn_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL
 347         | GFC_STD_LEGACY;
 348       break;
 349
 350     case OPT_std_legacy:
 351       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL
 352         | GFC_STD_F77 | GFC_STD_F95 | GFC_STD_F2003
 353         | GFC_STD_GNU | GFC_STD_LEGACY;
 354       gfc_option.warn_std = 0;
 355       break;
 356
 357     case OPT_Wnonstd_intrinsics:
 358       gfc_option.warn_nonstd_intrinsics = 1;
 359       break;
 360     }
 361
 362   return result;
 363 }