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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.2.2/] [gcc/] [cppspec.c] - Blame information for rev 154

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/* Specific flags and argument handling of the C preprocessor.
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   Copyright (C) 1999, 2007 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3.  If not see
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<http://www.gnu.org/licenses/>.  */
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#include "config.h"
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#include "system.h"
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#include "coretypes.h"
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#include "tm.h"
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#include "gcc.h"
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/* The `cpp' executable installed in $(bindir) and $(cpp_install_dir)
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   is a customized version of the gcc driver.  It forces -E; -S and -c
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   are errors.  It defaults to -x c for files with unrecognized
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   extensions, unless -x options appear in argv, in which case we
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   assume the user knows what they're doing.  If no explicit input is
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   mentioned, it will read stdin.  */
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#ifndef SWITCH_TAKES_ARG
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#define SWITCH_TAKES_ARG(CHAR) DEFAULT_SWITCH_TAKES_ARG(CHAR)
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#endif
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#ifndef WORD_SWITCH_TAKES_ARG
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#define WORD_SWITCH_TAKES_ARG(STR) DEFAULT_WORD_SWITCH_TAKES_ARG (STR)
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#endif
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/* Suffixes for known sorts of input files.  Note that we do not list
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   files which are normally considered to have been preprocessed already,
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   since the user's expectation is that `cpp' always preprocesses.  */
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static const char *const known_suffixes[] =
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{
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  ".c",  ".C",   ".S",   ".m",
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  ".cc", ".cxx", ".cpp", ".cp",  ".c++",
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  NULL
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};
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/* Filter argc and argv before processing by the gcc driver proper.  */
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void
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lang_specific_driver (int *in_argc, const char *const **in_argv,
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                      int *in_added_libraries ATTRIBUTE_UNUSED)
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{
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  int argc = *in_argc;
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  const char *const *argv = *in_argv;
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  /* Do we need to read stdin? */
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  int read_stdin = 1;
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  /* Do we need to insert -E? */
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  int need_E = 1;
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  /* Have we seen an input file? */
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  int seen_input = 0;
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  /* Positions to insert -xc, -xassembler-with-cpp, and -o, if necessary.
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  int lang_c_here = 0;
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  int lang_S_here = 0;
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  int o_here = 0;
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  /* Do we need to fix up an input file with an unrecognized suffix? */
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  int need_fixups = 1;
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  int i, j, quote = 0;
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  const char **new_argv;
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  int new_argc;
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  extern int is_cpp_driver;
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  is_cpp_driver = 1;
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  /* First pass.  If we see an -S or -c, barf.  If we see an input file,
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     turn off read_stdin.  If we see a second input file, it is actually
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     the output file.  If we see a third input file, barf.  */
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  for (i = 1; i < argc; i++)
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    {
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      if (quote == 1)
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        {
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          quote = 0;
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          continue;
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        }
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      if (argv[i][0] == '-')
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        {
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          if (argv[i][1] == '\0')
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            read_stdin = 0;
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          else if (argv[i][2] == '\0')
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            {
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              if (argv[i][1] == 'E')
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                need_E = 0;
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              else if (argv[i][1] == 'S' || argv[i][1] == 'c')
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                {
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                  fatal ("\"%s\" is not a valid option to the preprocessor",
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                         argv[i]);
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                  return;
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                }
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              else if (argv[i][1] == 'x')
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                {
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                  need_fixups = 0;
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                  quote = 1;
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                }
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              else if (SWITCH_TAKES_ARG (argv[i][1]))
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                quote = 1;
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            }
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          else if (argv[i][1] == 'x')
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            need_fixups = 0;
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          else if (WORD_SWITCH_TAKES_ARG (&argv[i][1]))
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            quote = 1;
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        }
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      else /* not an option */
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        {
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          seen_input++;
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          if (seen_input == 3)
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            {
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              fatal ("too many input files");
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              return;
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            }
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          else if (seen_input == 2)
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            {
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              o_here = i;
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            }
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          else
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            {
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              read_stdin = 0;
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              if (need_fixups)
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                {
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                  int l = strlen (argv[i]);
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                  int known = 0;
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                  const char *const *suff;
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                  for (suff = known_suffixes; *suff; suff++)
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                    if (!strcmp (*suff, &argv[i][l - strlen(*suff)]))
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                      {
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                        known = 1;
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                        break;
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                      }
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                  if (! known)
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                    {
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                      /* .s files are a special case; we have to treat
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                         them like .S files so -D__ASSEMBLER__ will be
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                         in effect.  */
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                      if (!strcmp (".s", &argv[i][l - 2]))
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                        lang_S_here = i;
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                      else
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                        lang_c_here = i;
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                    }
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                }
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            }
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        }
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    }
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  /* If we don't need to edit the command line, we can bail early.  */
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  new_argc = argc + need_E + read_stdin
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    + !!o_here + !!lang_c_here + !!lang_S_here;
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  if (new_argc == argc)
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    return;
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  /* One more slot for a terminating null.  */
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  new_argv = XNEWVEC (const char *, new_argc + 1);
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  new_argv[0] = argv[0];
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  j = 1;
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  if (need_E)
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    new_argv[j++] = "-E";
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  for (i = 1; i < argc; i++, j++)
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    {
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      if (i == lang_c_here)
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        new_argv[j++] = "-xc";
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      else if (i == lang_S_here)
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        new_argv[j++] = "-xassembler-with-cpp";
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      else if (i == o_here)
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        new_argv[j++] = "-o";
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      new_argv[j] = argv[i];
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    }
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  if (read_stdin)
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    new_argv[j++] = "-";
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  new_argv[j] = NULL;
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  *in_argc = new_argc;
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  *in_argv = new_argv;
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}
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/* Called before linking.  Returns 0 on success and -1 on failure.  */
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int lang_specific_pre_link (void)
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{
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  return 0;  /* Not used for cpp.  */
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}
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/* Number of extra output files that lang_specific_pre_link may generate.  */
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int lang_specific_extra_outfiles = 0;  /* Not used for cpp.  */

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