Subversion Repositories openrisc

/* Specific flags and argument handling of the Fortran front-end.

   Copyright (C) 1997, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,

   2007, 2008, 2009, 2010, 2011, 2012

   Free Software Foundation, Inc.

This file is part of GCC.

GNU CC 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.

GNU CC 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/>.  */

/* This file is copied more or less verbatim from g77.  */

/* This file contains a filter for the main `gcc' driver, which is

   replicated for the `gfortran' driver by adding this filter.  The purpose

   of this filter is to be basically identical to gcc (in that

   it faithfully passes all of the original arguments to gcc) but,

   unless explicitly overridden by the user in certain ways, ensure

   that the needs of the language supported by this wrapper are met.

   For GNU Fortran 95(gfortran), we do the following to the argument list

   before passing it to `gcc':

   1.  Make sure `-lgfortran -lm' is at the end of the list.

   2.  Make sure each time `-lgfortran' or `-lm' is seen, it forms

       part of the series `-lgfortran -lm'.

   #1 and #2 are not done if `-nostdlib' or any option that disables

   the linking phase is present, or if `-xfoo' is in effect.  Note that

   a lack of source files or -l options disables linking.

   This program was originally made out of gcc/cp/g++spec.c, but the

   way it builds the new argument list was rewritten so it is much

   easier to maintain, improve the way it decides to add or not add

   extra arguments, etc.  And several improvements were made in the

   handling of arguments, primarily to make it more consistent with

   `gcc' itself.  */

#include "config.h"

#include "system.h"

#include "coretypes.h"

#include "gcc.h"

#include "opts.h"

#include "tm.h"

#include "intl.h"

#ifndef MATH_LIBRARY

#define MATH_LIBRARY "m"

#endif

#ifndef FORTRAN_LIBRARY

#define FORTRAN_LIBRARY "gfortran"

#endif

/* Name of the spec file.  */

#define SPEC_FILE "libgfortran.spec"

/* The original argument list and related info is copied here.  */

static unsigned int g77_xargc;

static const struct cl_decoded_option *g77_x_decoded_options;

static void append_arg (const struct cl_decoded_option *);

/* The new argument list will be built here.  */

static unsigned int g77_newargc;

static struct cl_decoded_option *g77_new_decoded_options;

/* The path to the spec file.  */

static char *spec_file = NULL;

/* This will be NULL if we encounter a situation where we should not

   link in the fortran libraries.  */

static const char *library = NULL;

/* Return full path name of spec file if it is in DIR, or NULL if

   not.  */

static char *

find_spec_file (const char *dir)

{

  const char dirsep_string[] = { DIR_SEPARATOR, '\0' };

  char *spec;

  struct stat sb;

  spec = XNEWVEC (char, strlen (dir) + sizeof (SPEC_FILE) + 4);

  strcpy (spec, dir);

  strcat (spec, dirsep_string);

  strcat (spec, SPEC_FILE);

  if (!stat (spec, &sb))

    return spec;

  free (spec);

  return NULL;

}

/* Return whether strings S1 and S2 are both NULL or both the same

   string.  */

static bool

strings_same (const char *s1, const char *s2)

{

  return s1 == s2 || (s1 != NULL && s2 != NULL && strcmp (s1, s2) == 0);

}

/* Return whether decoded option structures OPT1 and OPT2 are the

   same.  */

static bool

options_same (const struct cl_decoded_option *opt1,

              const struct cl_decoded_option *opt2)

{

  return (opt1->opt_index == opt2->opt_index

          && strings_same (opt1->arg, opt2->arg)

          && strings_same (opt1->orig_option_with_args_text,

                           opt2->orig_option_with_args_text)

          && strings_same (opt1->canonical_option[0],

                           opt2->canonical_option[0])

          && strings_same (opt1->canonical_option[1],

                           opt2->canonical_option[1])

          && strings_same (opt1->canonical_option[2],

                           opt2->canonical_option[2])

          && strings_same (opt1->canonical_option[3],

                           opt2->canonical_option[3])

          && (opt1->canonical_option_num_elements

              == opt2->canonical_option_num_elements)

          && opt1->value == opt2->value

          && opt1->errors == opt2->errors);

}

/* Append another argument to the list being built.  As long as it is

   identical to the corresponding arg in the original list, just increment

   the new arg count.  Otherwise allocate a new list, etc.  */

static void

append_arg (const struct cl_decoded_option *arg)

{

  static unsigned int newargsize;

  if (g77_new_decoded_options == g77_x_decoded_options

      && g77_newargc < g77_xargc

      && options_same (arg, &g77_x_decoded_options[g77_newargc]))

    {

      ++g77_newargc;

      return;                   /* Nothing new here.  */

    }

  if (g77_new_decoded_options == g77_x_decoded_options)

    {                           /* Make new arglist.  */

      unsigned int i;

      newargsize = (g77_xargc << 2) + 20;       /* This should handle all.  */

      g77_new_decoded_options = XNEWVEC (struct cl_decoded_option, newargsize);

      /* Copy what has been done so far.  */

      for (i = 0; i < g77_newargc; ++i)

        g77_new_decoded_options[i] = g77_x_decoded_options[i];

    }

  if (g77_newargc == newargsize)

    fatal_error ("overflowed output arg list for %qs",

                 arg->orig_option_with_args_text);

  g77_new_decoded_options[g77_newargc++] = *arg;

}

/* Append an option described by OPT_INDEX, ARG and VALUE to the list

   being built.  */

static void

append_option (size_t opt_index, const char *arg, int value)

{

  struct cl_decoded_option decoded;

  generate_option (opt_index, arg, value, CL_DRIVER, &decoded);

  append_arg (&decoded);

}

/* Append a libgfortran argument to the list being built.  If

   FORCE_STATIC, ensure the library is linked statically.  */

static void

add_arg_libgfortran (bool force_static ATTRIBUTE_UNUSED)

{

#ifdef HAVE_LD_STATIC_DYNAMIC

  if (force_static)

    append_option (OPT_Wl_, LD_STATIC_OPTION, 1);

#endif

  append_option (OPT_l, FORTRAN_LIBRARY, 1);

#ifdef HAVE_LD_STATIC_DYNAMIC

  if (force_static)

    append_option (OPT_Wl_, LD_DYNAMIC_OPTION, 1);

#endif

}

void

lang_specific_driver (struct cl_decoded_option **in_decoded_options,

                      unsigned int *in_decoded_options_count,

                      int *in_added_libraries ATTRIBUTE_UNUSED)

{

  unsigned int argc = *in_decoded_options_count;

  struct cl_decoded_option *decoded_options = *in_decoded_options;

  unsigned int i;

  int verbose = 0;

  /* 0 => -xnone in effect.

     1 => -xfoo in effect.  */

  int saw_speclang = 0;

  /* 0 => initial/reset state

     1 => last arg was -l<library>

     2 => last two args were -l<library> -lm.  */

  int saw_library = 0;

  /* By default, we throw on the math library if we have one.  */

  int need_math = (MATH_LIBRARY[0] != '\0');

  /* Whether we should link a static libgfortran. */

  int static_lib = 0;

  /* Whether we need to link statically.  */

  int static_linking = 0;

  /* The number of input and output files in the incoming arg list.  */

  int n_infiles = 0;

  int n_outfiles = 0;

  library = FORTRAN_LIBRARY;

#if 0

  fprintf (stderr, "Incoming:");

  for (i = 0; i < argc; i++)

    fprintf (stderr, " %s", decoded_options[i].orig_option_with_args_text);

  fprintf (stderr, "\n");

#endif

  g77_xargc = argc;

  g77_x_decoded_options = decoded_options;

  g77_newargc = 0;

  g77_new_decoded_options = decoded_options;

  /* First pass through arglist.

     If -nostdlib or a "turn-off-linking" option is anywhere in the

     command line, don't do any library-option processing (except

     relating to -x).  */

  for (i = 1; i < argc; ++i)

    {

      if (decoded_options[i].errors & CL_ERR_MISSING_ARG)

        continue;

      switch (decoded_options[i].opt_index)

        {

        case OPT_SPECIAL_input_file:

          ++n_infiles;

          continue;

        case OPT_nostdlib:

        case OPT_nodefaultlibs:

        case OPT_c:

        case OPT_S:

        case OPT_fsyntax_only:

        case OPT_E:

          /* These options disable linking entirely or linking of the

             standard libraries.  */

          library = 0;

          break;

        case OPT_static_libgfortran:

#ifdef HAVE_LD_STATIC_DYNAMIC

          static_lib = 1;

#endif

          break;

        case OPT_static:

#ifdef HAVE_LD_STATIC_DYNAMIC

          static_linking = 1;

#endif

          break;

        case OPT_l:

          ++n_infiles;

          break;

        case OPT_o:

          ++n_outfiles;

          break;

        case OPT_v:

          verbose = 1;

          break;

        case OPT__version:

          printf ("GNU Fortran %s%s\n", pkgversion_string, version_string);

          printf ("Copyright %s 2012 Free Software Foundation, Inc.\n\n",

                  _("(C)"));

          printf (_("GNU Fortran comes with NO WARRANTY, to the extent permitted by law.\n\

You may redistribute copies of GNU Fortran\n\

under the terms of the GNU General Public License.\n\

For more information about these matters, see the file named COPYING\n\n"));

          exit (0);

          break;

        case OPT__help:

          /* Let gcc.c handle this, as it has a really

             cool facility for handling --help and --verbose --help.  */

          return;

        case OPT_L:

          if (!spec_file)

            spec_file = find_spec_file (decoded_options[i].arg);

          break;

        default:

          break;

        }

    }

  if ((n_outfiles != 0) && (n_infiles == 0))

    fatal_error ("no input files; unwilling to write output files");

  /* If there are no input files, no need for the library.  */

  if (n_infiles == 0)

    library = 0;

  /* Second pass through arglist, transforming arguments as appropriate.  */

  append_arg (&decoded_options[0]); /* Start with command name, of course.  */

  for (i = 1; i < argc; ++i)

    {

      if (decoded_options[i].errors & CL_ERR_MISSING_ARG)

        {

          append_arg (&decoded_options[i]);

          continue;

        }

      if (decoded_options[i].opt_index == OPT_SPECIAL_input_file

          && decoded_options[i].arg[0] == '\0')

        {

          /* Interesting.  Just append as is.  */

          append_arg (&decoded_options[i]);

          continue;

        }

      if (decoded_options[i].opt_index != OPT_l

          && (decoded_options[i].opt_index != OPT_SPECIAL_input_file

              || strcmp (decoded_options[i].arg, "-") == 0))

        {

          /* Not a filename or library.  */

          if (saw_library == 1 && need_math)    /* -l<library>.  */

            append_option (OPT_l, MATH_LIBRARY, 1);

          saw_library = 0;

          if (decoded_options[i].opt_index == OPT_SPECIAL_input_file)

            {

              append_arg (&decoded_options[i]); /* "-" == Standard input.  */

              continue;

            }

          if (decoded_options[i].opt_index == OPT_x)

            {

              /* Track input language.  */

              const char *lang = decoded_options[i].arg;

              saw_speclang = (strcmp (lang, "none") != 0);

            }

          append_arg (&decoded_options[i]);

          continue;

        }

      /* A filename/library, not an option.  */

      if (saw_speclang)

        saw_library = 0; /* -xfoo currently active.  */

      else

        {                       /* -lfoo or filename.  */

          if (decoded_options[i].opt_index == OPT_l

              && strcmp (decoded_options[i].arg, MATH_LIBRARY) == 0)

            {

              if (saw_library == 1)

                saw_library = 2;        /* -l<library> -lm.  */

              else

                add_arg_libgfortran (static_lib && !static_linking);

            }

          else if (decoded_options[i].opt_index == OPT_l

              && strcmp (decoded_options[i].arg, FORTRAN_LIBRARY) == 0)

            {

              saw_library = 1;  /* -l<library>.  */

              add_arg_libgfortran (static_lib && !static_linking);

              continue;

            }

          else

            {                   /* Other library, or filename.  */

              if (saw_library == 1 && need_math)

                append_option (OPT_l, MATH_LIBRARY, 1);

              saw_library = 0;

            }

        }

      append_arg (&decoded_options[i]);

    }

  /* Append `-lgfortran -lm' as necessary.  */

  if (library)

    {                           /* Doing a link and no -nostdlib.  */

      if (saw_speclang)

        append_option (OPT_x, "none", 1);

      switch (saw_library)

        {

        case 0:

          add_arg_libgfortran (static_lib && !static_linking);

          /* Fall through.  */

        case 1:

          if (need_math)

            append_option (OPT_l, MATH_LIBRARY, 1);

        default:

          break;

        }

    }

#ifdef ENABLE_SHARED_LIBGCC

  if (library)

    {

      unsigned int i;

      for (i = 1; i < g77_newargc; i++)

        if (g77_new_decoded_options[i].opt_index == OPT_static_libgcc

            || g77_new_decoded_options[i].opt_index == OPT_static)

          break;

      if (i == g77_newargc)

        append_option (OPT_shared_libgcc, NULL, 1);

    }

#endif

  /* Read the specs file corresponding to libgfortran.

     If we didn't find the spec file on the -L path, we load it

     via lang_specific_pre_link.  */

  if (spec_file)

    append_option (OPT_specs_, spec_file, 1);

  if (verbose && g77_new_decoded_options != g77_x_decoded_options)

    {

      fprintf (stderr, _("Driving:"));

      for (i = 0; i < g77_newargc; i++)

        fprintf (stderr, " %s",

                 g77_new_decoded_options[i].orig_option_with_args_text);

      fprintf (stderr, "\n");

    }

  *in_decoded_options_count = g77_newargc;

  *in_decoded_options = g77_new_decoded_options;

}

/* Called before linking.  Returns 0 on success and -1 on failure.  */

int

lang_specific_pre_link (void)

{

  free (spec_file);

  if (spec_file == NULL && library)

    do_spec ("%:include(libgfortran.spec)");

  return 0;

}

/* Number of extra output files that lang_specific_pre_link may generate.  */

int lang_specific_extra_outfiles = 0;    /* Not used for F77.  */