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, 59 Temple Place - Suite 330, Boston, MA
  21 02111-1307, 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
  74   gfc_option.q_kind = gfc_default_double_kind;
  75
  76   flag_argument_noalias = 2;
  77   flag_errno_math = 0;
  78
  79   gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL
  80     | GFC_STD_F2003 | GFC_STD_F95 | GFC_STD_F77 | GFC_STD_GNU
  81     | GFC_STD_LEGACY;
  82   gfc_option.warn_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL
  83     | GFC_STD_F2003 | GFC_STD_LEGACY;
  84
  85   gfc_option.warn_nonstd_intrinsics = 0;
  86
  87   return CL_F95;
  88 }
  89
  90
  91 /* Finalize commandline options.  */
  92
  93 bool
  94 gfc_post_options (const char **pfilename)
  95 {
  96   const char *filename = *pfilename;
  97
  98   /* Verify the input file name.  */
  99   if (!filename || strcmp (filename, "-") == 0)
 100     {
 101       filename = "";
 102     }
 103
 104   gfc_option.source = filename;
 105
 106   flag_inline_trees = 1;
 107
 108   /* Use tree inlining.  */
 109   if (!flag_no_inline)
 110     flag_no_inline = 1;
 111   if (flag_inline_functions)
 112     flag_inline_trees = 2;
 113
 114   /* If -pedantic, warn about the use of GNU extensions.  */
 115   if (pedantic && (gfc_option.allow_std & GFC_STD_GNU) != 0)
 116     gfc_option.warn_std |= GFC_STD_GNU;
 117   /* -std=legacy -pedantic is effectively -std=gnu.  */
 118   if (pedantic && (gfc_option.allow_std & GFC_STD_LEGACY) != 0)
 119     gfc_option.warn_std |= GFC_STD_F95_OBS | GFC_STD_F95_DEL | GFC_STD_LEGACY;
 120
 121   /* If the user didn't explicitly specify -f(no)-second-underscore we
 122      use it if we're trying to be compatible with f2c, and not
 123      otherwise.  */
 124   if (gfc_option.flag_second_underscore == -1)
 125     gfc_option.flag_second_underscore = gfc_option.flag_f2c;
 126
 127   return false;
 128 }
 129
 130
 131 /* Set the options for -Wall.  */
 132
 133 static void
 134 set_Wall (void)
 135 {
 136
 137   gfc_option.warn_aliasing = 1;
 138   gfc_option.warn_line_truncation = 1;
 139   gfc_option.warn_underflow = 1;
 140   gfc_option.warn_surprising = 1;
 141   gfc_option.warn_unused_labels = 1;
 142   gfc_option.warn_nonstd_intrinsics = 1;
 143
 144   set_Wunused (1);
 145   warn_return_type = 1;
 146   warn_switch = 1;
 147
 148   /* We save the value of warn_uninitialized, since if they put
 149      -Wuninitialized on the command line, we need to generate a
 150      warning about not using it without also specifying -O.  */
 151
 152   if (warn_uninitialized != 1)
 153     warn_uninitialized = 2;
 154 }
 155
 156
 157 static void
 158 gfc_handle_module_path_options (const char *arg)
 159 {
 160
 161   if (gfc_option.module_dir != NULL)
 162     {
 163       gfc_status ("gfortran: Only one -M option allowed\n");
 164       exit (3);
 165     }
 166
 167   if (arg == NULL)
 168     {
 169       gfc_status ("gfortran: Directory required after -M\n");
 170       exit (3);
 171     }
 172
 173   gfc_option.module_dir = (char *) gfc_getmem (strlen (arg) + 2);
 174   strcpy (gfc_option.module_dir, arg);
 175   strcat (gfc_option.module_dir, "/");
 176 }
 177
 178 /* Handle command-line options.  Returns 0 if unrecognized, 1 if
 179    recognized and handled.  */
 180 int
 181 gfc_handle_option (size_t scode, const char *arg, int value)
 182 {
 183   int result = 1;
 184   enum opt_code code = (enum opt_code) scode;
 185
 186   /* Ignore file names.  */
 187   if (code == N_OPTS)
 188     return 1;
 189
 190   switch (code)
 191     {
 192     default:
 193       result = 0;
 194       break;
 195
 196     case OPT_Wall:
 197       set_Wall ();
 198       break;
 199
 200     case OPT_Waliasing:
 201       gfc_option.warn_aliasing = value;
 202       break;
 203
 204     case OPT_Wconversion:
 205       gfc_option.warn_conversion = value;
 206       break;
 207
 208     case OPT_Wimplicit_interface:
 209       gfc_option.warn_implicit_interface = value;
 210       break;
 211
 212     case OPT_Wline_truncation:
 213       gfc_option.warn_line_truncation = value;
 214       break;
 215
 216     case OPT_Wunderflow:
 217       gfc_option.warn_underflow = value;
 218       break;
 219
 220     case OPT_Wsurprising:
 221       gfc_option.warn_surprising = value;
 222       break;
 223
 224     case OPT_Wunused_labels:
 225       gfc_option.warn_unused_labels = value;
 226       break;
 227
 228     case OPT_ff2c:
 229       gfc_option.flag_f2c = value;
 230       break;
 231
 232     case OPT_fdollar_ok:
 233       gfc_option.flag_dollar_ok = value;
 234       break;
 235
 236     case OPT_fdump_parse_tree:
 237       gfc_option.verbose = value;
 238       break;
 239
 240     case OPT_ffixed_form:
 241       gfc_option.source_form = FORM_FIXED;
 242       break;
 243
 244     case OPT_ffree_form:
 245       gfc_option.source_form = FORM_FREE;
 246       break;
 247
 248     case OPT_funderscoring:
 249       gfc_option.flag_underscoring = value;
 250       break;
 251
 252     case OPT_fsecond_underscore:
 253       gfc_option.flag_second_underscore = value;
 254       break;
 255
 256     case OPT_fimplicit_none:
 257       gfc_option.flag_implicit_none = value;
 258       break;
 259
 260     case OPT_fmax_stack_var_size_:
 261       gfc_option.flag_max_stack_var_size = value;
 262       break;
 263
 264     case OPT_fmodule_private:
 265       gfc_option.flag_module_access_private = value;
 266       break;
 267
 268     case OPT_fno_backend:
 269       gfc_option.flag_no_backend = value;
 270       break;
 271
 272     case OPT_fpack_derived:
 273       gfc_option.flag_pack_derived = value;
 274       break;
 275
 276     case OPT_frepack_arrays:
 277       gfc_option.flag_repack_arrays = value;
 278       break;
 279
 280     case OPT_ffixed_line_length_none:
 281       gfc_option.fixed_line_length = 0;
 282       break;
 283
 284     case OPT_ffixed_line_length_:
 285       if (value != 0 && value < 7)
 286         gfc_fatal_error ("Fixed line length must be at least seven.");
 287       gfc_option.fixed_line_length = value;
 288       break;
 289
 290     case OPT_fmax_identifier_length_:
 291       if (value > GFC_MAX_SYMBOL_LEN)
 292         gfc_fatal_error ("Maximum supported idenitifier length is %d",
 293                          GFC_MAX_SYMBOL_LEN);
 294       gfc_option.max_identifier_length = value;
 295       break;
 296
 297     case OPT_qkind_:
 298       if (gfc_validate_kind (BT_REAL, value, true) < 0)
 299         gfc_fatal_error ("Argument to -fqkind isn't a valid real kind");
 300       gfc_option.q_kind = value;
 301       break;
 302
 303     case OPT_fdefault_integer_8:
 304       gfc_option.flag_default_integer = value;
 305       break;
 306
 307     case OPT_fdefault_real_8:
 308       gfc_option.flag_default_real = value;
 309       break;
 310
 311     case OPT_fdefault_double_8:
 312       gfc_option.flag_default_double = value;
 313       break;
 314
 315     case OPT_I:
 316       gfc_add_include_path (arg);
 317       break;
 318
 319     case OPT_J:
 320     case OPT_M:
 321       gfc_handle_module_path_options (arg);
 322       break;
 323
 324     case OPT_std_f95:
 325       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F95 | GFC_STD_F77;
 326       gfc_option.warn_std = GFC_STD_F95_OBS;
 327       gfc_option.max_identifier_length = 31;
 328       break;
 329
 330     case OPT_std_f2003:
 331       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F77
 332         | GFC_STD_F2003 | GFC_STD_F95;
 333       gfc_option.warn_std = GFC_STD_F95_OBS;
 334       gfc_option.max_identifier_length = 63;
 335       break;
 336
 337     case OPT_std_gnu:
 338       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL
 339         | GFC_STD_F77 | GFC_STD_F95 | GFC_STD_F2003
 340         | GFC_STD_GNU | GFC_STD_LEGACY;
 341       gfc_option.warn_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL
 342         | GFC_STD_LEGACY;
 343       break;
 344
 345     case OPT_std_legacy:
 346       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL
 347         | GFC_STD_F77 | GFC_STD_F95 | GFC_STD_F2003
 348         | GFC_STD_GNU | GFC_STD_LEGACY;
 349       gfc_option.warn_std = 0;
 350       break;
 351
 352     case OPT_Wnonstd_intrinsics:
 353       gfc_option.warn_nonstd_intrinsics = 1;
 354       break;
 355     }
 356
 357   return result;
 358 }