gcc/fortran/options.c

/* Parse and display command line options.
   Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
   2009, 2010
   Free Software Foundation, Inc.
   Contributed by Andy Vaught

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.

GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3.  If not see
<http://www.gnu.org/licenses/>.  */

#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tree.h"
#include "flags.h"
#include "intl.h"
#include "opts.h"
#include "toplev.h"  /* For save_decoded_options.  */
#include "options.h"
#include "params.h"
#include "tree-inline.h"
#include "gfortran.h"
#include "target.h"
#include "cpp.h"
#include "diagnostic-core.h"	/* For sorry.  */
#include "tm.h"

gfc_option_t gfc_option;


/* Set flags that control warnings and errors for different
   Fortran standards to their default values.  Keep in sync with
   libgfortran/runtime/compile_options.c (init_compile_options).  */

static void
set_default_std_flags (void)
{
  gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL
    | GFC_STD_F2003 | GFC_STD_F2008 | GFC_STD_F95 | GFC_STD_F77
    | GFC_STD_F2008_OBS | GFC_STD_GNU | GFC_STD_LEGACY;
  gfc_option.warn_std = GFC_STD_F95_DEL | GFC_STD_LEGACY;
}


/* Return language mask for Fortran options.  */

unsigned int
gfc_option_lang_mask (void)
{
  return CL_Fortran;
}

/* Initialize options structure OPTS.  */

void
gfc_init_options_struct (struct gcc_options *opts)
{
  opts->x_flag_errno_math = 0;
  opts->x_flag_associative_math = -1;
}

/* Get ready for options handling. Keep in sync with
   libgfortran/runtime/compile_options.c (init_compile_options). */

void
gfc_init_options (unsigned int decoded_options_count,
		  struct cl_decoded_option *decoded_options)
{
  gfc_source_file = NULL;
  gfc_option.module_dir = NULL;
  gfc_option.source_form = FORM_UNKNOWN;
  gfc_option.fixed_line_length = 72;
  gfc_option.free_line_length = 132;
  gfc_option.max_continue_fixed = 255;
  gfc_option.max_continue_free = 255;
  gfc_option.max_identifier_length = GFC_MAX_SYMBOL_LEN;
  gfc_option.max_subrecord_length = 0;
  gfc_option.flag_max_array_constructor = 65535;
  gfc_option.convert = GFC_CONVERT_NATIVE;
  gfc_option.record_marker = 0;
  gfc_option.dump_fortran_original = 0;
  gfc_option.dump_fortran_optimized = 0;

  gfc_option.warn_aliasing = 0;
  gfc_option.warn_ampersand = 0;
  gfc_option.warn_character_truncation = 0;
  gfc_option.warn_array_temp = 0;
  gfc_option.gfc_warn_conversion = 0;
  gfc_option.warn_conversion_extra = 0;
  gfc_option.warn_implicit_interface = 0;
  gfc_option.warn_line_truncation = 0;
  gfc_option.warn_surprising = 0;
  gfc_option.warn_tabs = 1;
  gfc_option.warn_underflow = 1;
  gfc_option.warn_intrinsic_shadow = 0;
  gfc_option.warn_intrinsics_std = 0;
  gfc_option.warn_align_commons = 1;
  gfc_option.warn_real_q_constant = 0;
  gfc_option.warn_unused_dummy_argument = 0;
  gfc_option.max_errors = 25;

  gfc_option.flag_all_intrinsics = 0;
  gfc_option.flag_default_double = 0;
  gfc_option.flag_default_integer = 0;
  gfc_option.flag_default_real = 0;
  gfc_option.flag_dollar_ok = 0;
  gfc_option.flag_underscoring = 1;
  gfc_option.flag_whole_file = 1;
  gfc_option.flag_f2c = 0;
  gfc_option.flag_second_underscore = -1;
  gfc_option.flag_implicit_none = 0;

  /* Default value of flag_max_stack_var_size is set in gfc_post_options.  */
  gfc_option.flag_max_stack_var_size = -2;

  gfc_option.flag_range_check = 1;
  gfc_option.flag_pack_derived = 0;
  gfc_option.flag_repack_arrays = 0;
  gfc_option.flag_preprocessed = 0;
  gfc_option.flag_automatic = 1;
  gfc_option.flag_backslash = 0;
  gfc_option.flag_module_private = 0;
  gfc_option.flag_backtrace = 0;
  gfc_option.flag_allow_leading_underscore = 0;
  gfc_option.flag_dump_core = 0;
  gfc_option.flag_external_blas = 0;
  gfc_option.blas_matmul_limit = 30;
  gfc_option.flag_cray_pointer = 0;
  gfc_option.flag_d_lines = -1;
  gfc_option.gfc_flag_openmp = 0;
  gfc_option.flag_sign_zero = 1;
  gfc_option.flag_recursive = 0;
  gfc_option.flag_init_integer = GFC_INIT_INTEGER_OFF;
  gfc_option.flag_init_integer_value = 0;
  gfc_option.flag_init_real = GFC_INIT_REAL_OFF;
  gfc_option.flag_init_logical = GFC_INIT_LOGICAL_OFF;
  gfc_option.flag_init_character = GFC_INIT_CHARACTER_OFF;
  gfc_option.flag_init_character_value = (char)0;
  gfc_option.flag_align_commons = 1;
  gfc_option.flag_protect_parens = 1;
  gfc_option.flag_realloc_lhs = -1;
  
  gfc_option.fpe = 0;
  gfc_option.rtcheck = 0;
  gfc_option.coarray = GFC_FCOARRAY_NONE;

  set_default_std_flags ();

  /* Initialize cpp-related options.  */
  gfc_cpp_init_options (decoded_options_count, decoded_options);
}


/* Determine the source form from the filename extension.  We assume
   case insensitivity.  */

static gfc_source_form
form_from_filename (const char *filename)
{
  static const struct
  {
    const char *extension;
    gfc_source_form form;
  }
  exttype[] =
  {
    {
    ".f90", FORM_FREE}
    ,
    {
    ".f95", FORM_FREE}
    ,
    {
    ".f03", FORM_FREE}
    ,
    {
    ".f08", FORM_FREE}
    ,
    {
    ".f", FORM_FIXED}
    ,
    {
    ".for", FORM_FIXED}
    ,
    {
    ".ftn", FORM_FIXED}
    ,
    {
    "", FORM_UNKNOWN}
  };		/* sentinel value */

  gfc_source_form f_form;
  const char *fileext;
  int i;

  /* Find end of file name.  Note, filename is either a NULL pointer or
     a NUL terminated string.  */
  i = 0;
  while (filename[i] != '\0')
    i++;

  /* Find last period.  */
  while (i >= 0 && (filename[i] != '.'))
    i--;

  /* Did we see a file extension?  */
  if (i < 0)
    return FORM_UNKNOWN; /* Nope  */

  /* Get file extension and compare it to others.  */
  fileext = &(filename[i]);

  i = -1;
  f_form = FORM_UNKNOWN;
  do
    {
      i++;
      if (strcasecmp (fileext, exttype[i].extension) == 0)
	{
	  f_form = exttype[i].form;
	  break;
	}
    }
  while (exttype[i].form != FORM_UNKNOWN);

  return f_form;
}


/* Finalize commandline options.  */

bool
gfc_post_options (const char **pfilename)
{
  const char *filename = *pfilename, *canon_source_file = NULL;
  char *source_path;
  int i;

  /* Excess precision other than "fast" requires front-end
     support.  */
  if (flag_excess_precision_cmdline == EXCESS_PRECISION_STANDARD
      && TARGET_FLT_EVAL_METHOD_NON_DEFAULT)
    sorry ("-fexcess-precision=standard for Fortran");
  flag_excess_precision_cmdline = EXCESS_PRECISION_FAST;

  /* Whole program needs whole file mode.  */
  if (flag_whole_program)
    gfc_option.flag_whole_file = 1;

  /* Enable whole-file mode if LTO is in effect.  */
  if (flag_lto)
    gfc_option.flag_whole_file = 1;

  /* Fortran allows associative math - but we cannot reassociate if
     we want traps or signed zeros. Cf. also flag_protect_parens.  */
  if (flag_associative_math == -1)
    flag_associative_math = (!flag_trapping_math && !flag_signed_zeros);

  /* By default, disable (re)allocation during assignment for -std=f95,
     and enable it for F2003/F2008/GNU/Legacy. */
  if (gfc_option.flag_realloc_lhs == -1)
    {
      if (gfc_option.allow_std & GFC_STD_F2003)
	gfc_option.flag_realloc_lhs = 1;
      else
	gfc_option.flag_realloc_lhs = 0;
    }

  /* -fbounds-check is equivalent to -fcheck=bounds */
  if (flag_bounds_check)
    gfc_option.rtcheck |= GFC_RTCHECK_BOUNDS;

  if (flag_compare_debug)
    gfc_option.dump_fortran_original = 0;

  /* Make -fmax-errors visible to gfortran's diagnostic machinery.  */
  if (global_options_set.x_flag_max_errors)
    gfc_option.max_errors = flag_max_errors;

  /* Verify the input file name.  */
  if (!filename || strcmp (filename, "-") == 0)
    {
      filename = "";
    }

  if (gfc_option.flag_preprocessed)
    {
      /* For preprocessed files, if the first tokens are of the form # NUM.
	 handle the directives so we know the original file name.  */
      gfc_source_file = gfc_read_orig_filename (filename, &canon_source_file);
      if (gfc_source_file == NULL)
	gfc_source_file = filename;
      else
	*pfilename = gfc_source_file;
    }
  else
    gfc_source_file = filename;

  if (canon_source_file == NULL)
    canon_source_file = gfc_source_file;

  /* Adds the path where the source file is to the list of include files.  */

  i = strlen (canon_source_file);
  while (i > 0 && !IS_DIR_SEPARATOR (canon_source_file[i]))
    i--;

  if (i != 0)
    {
      source_path = (char *) alloca (i + 1);
      memcpy (source_path, canon_source_file, i);
      source_path[i] = 0;
      gfc_add_include_path (source_path, true, true);
    }
  else
    gfc_add_include_path (".", true, true);

  if (canon_source_file != gfc_source_file)
    gfc_free (CONST_CAST (char *, canon_source_file));

  /* Decide which form the file will be read in as.  */

  if (gfc_option.source_form != FORM_UNKNOWN)
    gfc_current_form = gfc_option.source_form;
  else
    {
      gfc_current_form = form_from_filename (filename);

      if (gfc_current_form == FORM_UNKNOWN)
	{
	  gfc_current_form = FORM_FREE;
	  gfc_warning_now ("Reading file '%s' as free form", 
			   (filename[0] == '\0') ? "<stdin>" : filename);
	}
    }

  /* If the user specified -fd-lines-as-{code|comments} verify that we're
     in fixed form.  */
  if (gfc_current_form == FORM_FREE)
    {
      if (gfc_option.flag_d_lines == 0)
	gfc_warning_now ("'-fd-lines-as-comments' has no effect "
			 "in free form");
      else if (gfc_option.flag_d_lines == 1)
	gfc_warning_now ("'-fd-lines-as-code' has no effect in free form");
    }

  /* If -pedantic, warn about the use of GNU extensions.  */
  if (pedantic && (gfc_option.allow_std & GFC_STD_GNU) != 0)
    gfc_option.warn_std |= GFC_STD_GNU;
  /* -std=legacy -pedantic is effectively -std=gnu.  */
  if (pedantic && (gfc_option.allow_std & GFC_STD_LEGACY) != 0)
    gfc_option.warn_std |= GFC_STD_F95_OBS | GFC_STD_F95_DEL | GFC_STD_LEGACY;

  /* If the user didn't explicitly specify -f(no)-second-underscore we
     use it if we're trying to be compatible with f2c, and not
     otherwise.  */
  if (gfc_option.flag_second_underscore == -1)
    gfc_option.flag_second_underscore = gfc_option.flag_f2c;

  if (!gfc_option.flag_automatic && gfc_option.flag_max_stack_var_size != -2
      && gfc_option.flag_max_stack_var_size != 0)
    gfc_warning_now ("Flag -fno-automatic overwrites -fmax-stack-var-size=%d",
		     gfc_option.flag_max_stack_var_size);
  else if (!gfc_option.flag_automatic && gfc_option.flag_recursive)
    gfc_warning_now ("Flag -fno-automatic overwrites -frecursive");
  else if (!gfc_option.flag_automatic && gfc_option.gfc_flag_openmp)
    gfc_warning_now ("Flag -fno-automatic overwrites -frecursive implied by "
		     "-fopenmp");
  else if (gfc_option.flag_max_stack_var_size != -2
	   && gfc_option.flag_recursive)
    gfc_warning_now ("Flag -frecursive overwrites -fmax-stack-var-size=%d",
		     gfc_option.flag_max_stack_var_size);
  else if (gfc_option.flag_max_stack_var_size != -2
	   && gfc_option.gfc_flag_openmp)
    gfc_warning_now ("Flag -fmax-stack-var-size=%d overwrites -frecursive "
		     "implied by -fopenmp", 
		     gfc_option.flag_max_stack_var_size);

  /* Implement -frecursive as -fmax-stack-var-size=-1.  */
  if (gfc_option.flag_recursive)
    gfc_option.flag_max_stack_var_size = -1;

  /* Implied -frecursive; implemented as -fmax-stack-var-size=-1.  */
  if (gfc_option.flag_max_stack_var_size == -2 && gfc_option.gfc_flag_openmp
      && gfc_option.flag_automatic)
    {
      gfc_option.flag_recursive = 1;
      gfc_option.flag_max_stack_var_size = -1;
    }

  /* Set default.  */
  if (gfc_option.flag_max_stack_var_size == -2)
    gfc_option.flag_max_stack_var_size = 32768;

  /* Implement -fno-automatic as -fmax-stack-var-size=0.  */
  if (!gfc_option.flag_automatic)
    gfc_option.flag_max_stack_var_size = 0;
  
  if (pedantic)
    { 
      gfc_option.warn_ampersand = 1;
      gfc_option.warn_tabs = 0;
    }

  if (pedantic && gfc_option.flag_whole_file)
    gfc_option.flag_whole_file = 2;

  gfc_cpp_post_options ();

/* FIXME: return gfc_cpp_preprocess_only ();

   The return value of this function indicates whether the
   backend needs to be initialized. On -E, we don't need
   the backend. However, if we return 'true' here, an
   ICE occurs. Initializing the backend doesn't hurt much,
   hence, for now we can live with it as is.  */
  return false;
}


/* Set the options for -Wall.  */

static void
set_Wall (int setting)
{
  gfc_option.warn_aliasing = setting;
  gfc_option.warn_ampersand = setting;
  gfc_option.gfc_warn_conversion = setting;
  gfc_option.warn_line_truncation = setting;
  gfc_option.warn_surprising = setting;
  gfc_option.warn_tabs = !setting;
  gfc_option.warn_underflow = setting;
  gfc_option.warn_intrinsic_shadow = setting;
  gfc_option.warn_intrinsics_std = setting;
  gfc_option.warn_character_truncation = setting;
  gfc_option.warn_real_q_constant = setting;
  gfc_option.warn_unused_dummy_argument = setting;

  warn_unused = setting;
  warn_return_type = setting;
  warn_switch = setting;
  warn_uninitialized = setting;
}


static void
gfc_handle_module_path_options (const char *arg)
{

  if (gfc_option.module_dir != NULL)
    gfc_fatal_error ("gfortran: Only one -J option allowed");

  gfc_option.module_dir = (char *) gfc_getmem (strlen (arg) + 2);
  strcpy (gfc_option.module_dir, arg);

  gfc_add_include_path (gfc_option.module_dir, true, false);

  strcat (gfc_option.module_dir, "/");
}


static void
gfc_handle_fpe_trap_option (const char *arg)
{
  int result, pos = 0, n;
  static const char * const exception[] = { "invalid", "denormal", "zero",
					    "overflow", "underflow",
					    "precision", NULL };
  static const int opt_exception[] = { GFC_FPE_INVALID, GFC_FPE_DENORMAL,
				       GFC_FPE_ZERO, GFC_FPE_OVERFLOW,
				       GFC_FPE_UNDERFLOW, GFC_FPE_PRECISION,
				       0 };
 
  while (*arg)
    {
      while (*arg == ',')
	arg++;

      while (arg[pos] && arg[pos] != ',')
	pos++;

      result = 0;
      for (n = 0; exception[n] != NULL; n++)
	{
	  if (exception[n] && strncmp (exception[n], arg, pos) == 0)
	    {
	      gfc_option.fpe |= opt_exception[n];
	      arg += pos;
	      pos = 0;
	      result = 1;
	      break;
	    }
	}
      if (!result)
	gfc_fatal_error ("Argument to -ffpe-trap is not valid: %s", arg);
    }
}


static void
gfc_handle_coarray_option (const char *arg)
{
  if (strcmp (arg, "none") == 0)
    gfc_option.coarray = GFC_FCOARRAY_NONE;
  else if (strcmp (arg, "single") == 0)
    gfc_option.coarray = GFC_FCOARRAY_SINGLE;
  else
    gfc_fatal_error ("Argument to -fcoarray is not valid: %s", arg);
}


static void
gfc_handle_runtime_check_option (const char *arg)
{
  int result, pos = 0, n;
  static const char * const optname[] = { "all", "bounds", "array-temps",
					  "recursion", "do", "pointer",
					  "mem", NULL };
  static const int optmask[] = { GFC_RTCHECK_ALL, GFC_RTCHECK_BOUNDS,
				 GFC_RTCHECK_ARRAY_TEMPS,
				 GFC_RTCHECK_RECURSION, GFC_RTCHECK_DO,
				 GFC_RTCHECK_POINTER, GFC_RTCHECK_MEM,
				 0 };
 
  while (*arg)
    {
      while (*arg == ',')
	arg++;

      while (arg[pos] && arg[pos] != ',')
	pos++;

      result = 0;
      for (n = 0; optname[n] != NULL; n++)
	{
	  if (optname[n] && strncmp (optname[n], arg, pos) == 0)
	    {
	      gfc_option.rtcheck |= optmask[n];
	      arg += pos;
	      pos = 0;
	      result = 1;
	      break;
	    }
	}
      if (!result)
	gfc_fatal_error ("Argument to -fcheck is not valid: %s", arg);
    }
}


/* Handle command-line options.  Returns 0 if unrecognized, 1 if
   recognized and handled.  */

bool
gfc_handle_option (size_t scode, const char *arg, int value,
		   int kind ATTRIBUTE_UNUSED, location_t loc ATTRIBUTE_UNUSED,
		   const struct cl_option_handlers *handlers ATTRIBUTE_UNUSED)
{
  bool result = true;
  enum opt_code code = (enum opt_code) scode;

  if (gfc_cpp_handle_option (scode, arg, value) == 1)
    return true;

  switch (code)
    {
    default:
      result = false;
      break;

    case OPT_Wall:
      set_Wall (value);
      break;

    case OPT_Waliasing:
      gfc_option.warn_aliasing = value;
      break;

    case OPT_Wampersand:
      gfc_option.warn_ampersand = value;
      break;

    case OPT_Warray_temporaries:
      gfc_option.warn_array_temp = value;
      break;

    case OPT_Wcharacter_truncation:
      gfc_option.warn_character_truncation = value;
      break;

    case OPT_Wconversion:
      gfc_option.gfc_warn_conversion = value;
      break;

    case OPT_Wconversion_extra:
      gfc_option.warn_conversion_extra = value;
      break;

    case OPT_Wimplicit_interface:
      gfc_option.warn_implicit_interface = value;
      break;

    case OPT_Wimplicit_procedure:
      gfc_option.warn_implicit_procedure = value;
      break;

    case OPT_Wline_truncation:
      gfc_option.warn_line_truncation = value;
      break;

    case OPT_Wreturn_type:
      warn_return_type = value;
      break;

    case OPT_Wsurprising:
      gfc_option.warn_surprising = value;
      break;

    case OPT_Wtabs:
      gfc_option.warn_tabs = value;
      break;

    case OPT_Wunderflow:
      gfc_option.warn_underflow = value;
      break;

    case OPT_Wintrinsic_shadow:
      gfc_option.warn_intrinsic_shadow = value;
      break;

    case OPT_Walign_commons:
      gfc_option.warn_align_commons = value;
      break;

    case OPT_Wreal_q_constant:
      gfc_option.warn_real_q_constant = value;
      break;

    case OPT_Wunused_dummy_argument:
      gfc_option.warn_unused_dummy_argument = value;
      break;

    case OPT_fall_intrinsics:
      gfc_option.flag_all_intrinsics = 1;
      break;

    case OPT_fautomatic:
      gfc_option.flag_automatic = value;
      break;

    case OPT_fallow_leading_underscore:
      gfc_option.flag_allow_leading_underscore = value;
      break;
      
    case OPT_fbackslash:
      gfc_option.flag_backslash = value;
      break;
      
    case OPT_fbacktrace:
      gfc_option.flag_backtrace = value;
      break;
      
    case OPT_fcheck_array_temporaries:
      gfc_option.rtcheck |= GFC_RTCHECK_ARRAY_TEMPS;
      break;
      
    case OPT_fdump_core:
      gfc_option.flag_dump_core = value;
      break;

    case OPT_fcray_pointer:
      gfc_option.flag_cray_pointer = value;
      break;

    case OPT_ff2c:
      gfc_option.flag_f2c = value;
      break;

    case OPT_fdollar_ok:
      gfc_option.flag_dollar_ok = value;
      break;

    case OPT_fexternal_blas:
      gfc_option.flag_external_blas = value;
      break;

    case OPT_fblas_matmul_limit_:
      gfc_option.blas_matmul_limit = value;
      break;

    case OPT_fd_lines_as_code:
      gfc_option.flag_d_lines = 1;
      break;

    case OPT_fd_lines_as_comments:
      gfc_option.flag_d_lines = 0;
      break;

    case OPT_fdump_fortran_original:
    case OPT_fdump_parse_tree:
      gfc_option.dump_fortran_original = value;
      break;

    case OPT_fdump_fortran_optimized:
      gfc_option.dump_fortran_optimized = value;
      break;

    case OPT_ffixed_form:
      gfc_option.source_form = FORM_FIXED;
      break;

    case OPT_ffixed_line_length_none:
      gfc_option.fixed_line_length = 0;
      break;

    case OPT_ffixed_line_length_:
      if (value != 0 && value < 7)
	gfc_fatal_error ("Fixed line length must be at least seven.");
      gfc_option.fixed_line_length = value;
      break;

    case OPT_ffree_form:
      gfc_option.source_form = FORM_FREE;
      break;

    case OPT_fopenmp:
      gfc_option.gfc_flag_openmp = value;
      break;

    case OPT_ffree_line_length_none:
      gfc_option.free_line_length = 0;
      break;

    case OPT_ffree_line_length_:
      if (value != 0 && value < 4)
	gfc_fatal_error ("Free line length must be at least three.");
      gfc_option.free_line_length = value;
      break;

    case OPT_funderscoring:
      gfc_option.flag_underscoring = value;
      break;

    case OPT_fwhole_file:
      gfc_option.flag_whole_file = value;
      break;

    case OPT_fsecond_underscore:
      gfc_option.flag_second_underscore = value;
      break;

    case OPT_static_libgfortran:
#ifndef HAVE_LD_STATIC_DYNAMIC
      gfc_fatal_error ("-static-libgfortran is not supported in this "
		       "configuration");
#endif
      break;

    case OPT_fimplicit_none:
      gfc_option.flag_implicit_none = value;
      break;

    case OPT_fintrinsic_modules_path:
      gfc_add_include_path (arg, false, false);
      gfc_add_intrinsic_modules_path (arg);
      break;

    case OPT_fmax_array_constructor_:
      gfc_option.flag_max_array_constructor = value > 65535 ? value : 65535;
      break;

    case OPT_fmax_stack_var_size_:
      gfc_option.flag_max_stack_var_size = value;
      break;

    case OPT_fmodule_private:
      gfc_option.flag_module_private = value;
      break;
      
    case OPT_frange_check:
      gfc_option.flag_range_check = value;
      break;

    case OPT_fpack_derived:
      gfc_option.flag_pack_derived = value;
      break;

    case OPT_frepack_arrays:
      gfc_option.flag_repack_arrays = value;
      break;

    case OPT_fpreprocessed:
      gfc_option.flag_preprocessed = value;
      break;

    case OPT_fmax_identifier_length_:
      if (value > GFC_MAX_SYMBOL_LEN)
	gfc_fatal_error ("Maximum supported identifier length is %d",
			 GFC_MAX_SYMBOL_LEN);
      gfc_option.max_identifier_length = value;
      break;

    case OPT_fdefault_integer_8:
      gfc_option.flag_default_integer = value;
      break;

    case OPT_fdefault_real_8:
      gfc_option.flag_default_real = value;
      break;

    case OPT_fdefault_double_8:
      gfc_option.flag_default_double = value;
      break;

    case OPT_finit_local_zero:
      gfc_option.flag_init_integer = GFC_INIT_INTEGER_ON;
      gfc_option.flag_init_integer_value = 0;
      gfc_option.flag_init_real = GFC_INIT_REAL_ZERO;
      gfc_option.flag_init_logical = GFC_INIT_LOGICAL_FALSE;
      gfc_option.flag_init_character = GFC_INIT_CHARACTER_ON;
      gfc_option.flag_init_character_value = (char)0;
      break;

    case OPT_finit_logical_:
      if (!strcasecmp (arg, "false"))
	gfc_option.flag_init_logical = GFC_INIT_LOGICAL_FALSE;
      else if (!strcasecmp (arg, "true"))
	gfc_option.flag_init_logical = GFC_INIT_LOGICAL_TRUE;
      else
	gfc_fatal_error ("Unrecognized option to -finit-logical: %s",
			 arg);
      break;

    case OPT_finit_real_:
      if (!strcasecmp (arg, "zero"))
	gfc_option.flag_init_real = GFC_INIT_REAL_ZERO;
      else if (!strcasecmp (arg, "nan"))
	gfc_option.flag_init_real = GFC_INIT_REAL_NAN;
      else if (!strcasecmp (arg, "snan"))
	gfc_option.flag_init_real = GFC_INIT_REAL_SNAN;
      else if (!strcasecmp (arg, "inf"))
	gfc_option.flag_init_real = GFC_INIT_REAL_INF;
      else if (!strcasecmp (arg, "-inf"))
	gfc_option.flag_init_real = GFC_INIT_REAL_NEG_INF;
      else
	gfc_fatal_error ("Unrecognized option to -finit-real: %s",
			 arg);
      break;

    case OPT_finit_integer_:
      gfc_option.flag_init_integer = GFC_INIT_INTEGER_ON;
      gfc_option.flag_init_integer_value = atoi (arg);
      break;

    case OPT_finit_character_:
      if (value >= 0 && value <= 127)
	{
	  gfc_option.flag_init_character = GFC_INIT_CHARACTER_ON;
	  gfc_option.flag_init_character_value = (char)value;
	}
      else
	gfc_fatal_error ("The value of n in -finit-character=n must be "
			 "between 0 and 127");
      break;

    case OPT_I:
      gfc_add_include_path (arg, true, false);
      break;

    case OPT_J:
      gfc_handle_module_path_options (arg);
      break;

    case OPT_fsign_zero:
      gfc_option.flag_sign_zero = value;
      break;

    case OPT_ffpe_trap_:
      gfc_handle_fpe_trap_option (arg);
      break;

    case OPT_std_f95:
      gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F95 | GFC_STD_F77
			     | GFC_STD_F2008_OBS;
      gfc_option.warn_std = GFC_STD_F95_OBS;
      gfc_option.max_continue_fixed = 19;
      gfc_option.max_continue_free = 39;
      gfc_option.max_identifier_length = 31;
      gfc_option.warn_ampersand = 1;
      gfc_option.warn_tabs = 0;
      break;

    case OPT_std_f2003:
      gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F77 
	| GFC_STD_F2003 | GFC_STD_F95 | GFC_STD_F2008_OBS;
      gfc_option.warn_std = GFC_STD_F95_OBS;
      gfc_option.max_identifier_length = 63;
      gfc_option.warn_ampersand = 1;
      gfc_option.warn_tabs = 0;
      break;

    case OPT_std_f2008:
      gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F77 
	| GFC_STD_F2003 | GFC_STD_F95 | GFC_STD_F2008 | GFC_STD_F2008_OBS;
      gfc_option.warn_std = GFC_STD_F95_OBS | GFC_STD_F2008_OBS;
      gfc_option.max_identifier_length = 63;
      gfc_option.warn_ampersand = 1;
      gfc_option.warn_tabs = 0;
      break;

    case OPT_std_gnu:
      set_default_std_flags ();
      break;

    case OPT_std_legacy:
      set_default_std_flags ();
      gfc_option.warn_std = 0;
      break;

    case OPT_Wintrinsics_std:
      gfc_option.warn_intrinsics_std = value;
      break;

    case OPT_fshort_enums:
      /* Handled in language-independent code.  */
      break;

    case OPT_fconvert_little_endian:
      gfc_option.convert = GFC_CONVERT_LITTLE;
      break;

    case OPT_fconvert_big_endian:
      gfc_option.convert = GFC_CONVERT_BIG;
      break;

    case OPT_fconvert_native:
      gfc_option.convert = GFC_CONVERT_NATIVE;
      break;

    case OPT_fconvert_swap:
      gfc_option.convert = GFC_CONVERT_SWAP;
      break;

    case OPT_frecord_marker_4:
      gfc_option.record_marker = 4;
      break;

    case OPT_frecord_marker_8:
      gfc_option.record_marker = 8;
      break;

    case OPT_fmax_subrecord_length_:
      if (value > MAX_SUBRECORD_LENGTH)
	gfc_fatal_error ("Maximum subrecord length cannot exceed %d",
			 MAX_SUBRECORD_LENGTH);

      gfc_option.max_subrecord_length = value;
      break;

    case OPT_frecursive:
      gfc_option.flag_recursive = value;
      break;

    case OPT_falign_commons:
      gfc_option.flag_align_commons = value;
      break;

    case OPT_fprotect_parens:
      gfc_option.flag_protect_parens = value;
      break;

    case OPT_frealloc_lhs:
      gfc_option.flag_realloc_lhs = value;
      break;

    case OPT_fcheck_:
      gfc_handle_runtime_check_option (arg);
      break;

    case OPT_fcoarray_:
      gfc_handle_coarray_option (arg);
      break;
    }

  return result;
}


/* Return a string with the options passed to the compiler; used for
   Fortran's compiler_options() intrinsic.  */

char *
gfc_get_option_string (void)
{
  unsigned j;
  size_t len, pos;
  char *result;

  /* Determine required string length.  */

  len = 0;
  for (j = 1; j < save_decoded_options_count; j++)
    {
      switch (save_decoded_options[j].opt_index)
        {
        case OPT_o:
        case OPT_d:
        case OPT_dumpbase:
        case OPT_dumpdir:
        case OPT_auxbase:
        case OPT_quiet:
        case OPT_version:
        case OPT_fintrinsic_modules_path:
          /* Ignore these.  */
          break;
	default:
	  /* Ignore file names. */
	  if (save_decoded_options[j].orig_option_with_args_text[0] == '-')
	    len += 1
		 + strlen (save_decoded_options[j].orig_option_with_args_text);
        }
    }

  result = (char *) gfc_getmem (len);

  pos = 0; 
  for (j = 1; j < save_decoded_options_count; j++)
    {
      switch (save_decoded_options[j].opt_index)
        {
        case OPT_o:
        case OPT_d:
        case OPT_dumpbase:
        case OPT_dumpdir:
        case OPT_auxbase:
        case OPT_quiet:
        case OPT_version:
        case OPT_fintrinsic_modules_path:
          /* Ignore these.  */
	  continue;

        case OPT_cpp_:
	  /* Use "-cpp" rather than "-cpp=<temporary file>".  */
	  len = 4;
	  break;

        default:
	  /* Ignore file names. */
	  if (save_decoded_options[j].orig_option_with_args_text[0] != '-')
	    continue;

	  len = strlen (save_decoded_options[j].orig_option_with_args_text);
        }

      memcpy (&result[pos], save_decoded_options[j].orig_option_with_args_text, len);
      pos += len;
      result[pos++] = ' ';
    }

  result[--pos] = '\0';
  return result;
}