Only create gcc/configargs.h if gcc build directory is present

[official-gcc.git] / gcc / cppinit.c

/* CPP Library.
   Copyright (C) 1986, 1987, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
   1999, 2000 Free Software Foundation, Inc.
   Contributed by Per Bothner, 1994-95.
   Based on CCCP program by Paul Rubin, June 1986
   Adapted to ANSI C, Richard Stallman, Jan 1987

This program 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 2, or (at your option) any
later version.

This program 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 this program; if not, write to the Free Software
Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#include "config.h"
#include "system.h"
#include "cpplib.h"
#include "cpphash.h"
#include "output.h"
#include "prefix.h"
#include "intl.h"
#include "version.h"
#include "mkdeps.h"
#include "cppdefault.h"

/* Predefined symbols, built-in macros, and the default include path. */

#ifndef GET_ENV_PATH_LIST
#define GET_ENV_PATH_LIST(VAR,NAME)     do { (VAR) = getenv (NAME); } while (0)
#endif

/* Windows does not natively support inodes, and neither does MSDOS.
   Cygwin's emulation can generate non-unique inodes, so don't use it.
   VMS has non-numeric inodes. */
#ifdef VMS
#define INO_T_EQ(a, b) (!memcmp (&(a), &(b), sizeof (a)))
#elif (defined _WIN32 && ! defined (_UWIN)) || defined __MSDOS__
#define INO_T_EQ(a, b) 0
#else
#define INO_T_EQ(a, b) ((a) == (b))
#endif

/* Internal structures and prototypes. */

/* A `struct pending_option' remembers one -D, -A, -U, -include, or -imacros
   switch.  There are four lists: one for -D and -U, one for -A, one
   for -include, one for -imacros.  `undef' is set for -U, clear for
   -D, ignored for the others.
   (Future: add an equivalent of -U for -A) */

typedef void (* cl_directive_handler) PARAMS ((cpp_reader *, const char *));
struct pending_option
{
  struct pending_option *next;
  const char *arg;
  cl_directive_handler handler;
};

/* The `pending' structure accumulates all the options that are not
   actually processed until we hit cpp_start_read.  It consists of
   several lists, one for each type of option.  We keep both head and
   tail pointers for quick insertion. */
struct cpp_pending
{
  struct pending_option *directive_head, *directive_tail;

  struct file_name_list *quote_head, *quote_tail;
  struct file_name_list *brack_head, *brack_tail;
  struct file_name_list *systm_head, *systm_tail;
  struct file_name_list *after_head, *after_tail;

  struct pending_option *imacros_head, *imacros_tail;
  struct pending_option *include_head, *include_tail;
};

#ifdef __STDC__
#define APPEND(pend, list, elt) \
  do {  if (!(pend)->list##_head) (pend)->list##_head = (elt); \
        else (pend)->list##_tail->next = (elt); \
        (pend)->list##_tail = (elt); \
  } while (0)
#else
#define APPEND(pend, list, elt) \
  do {  if (!(pend)->list/**/_head) (pend)->list/**/_head = (elt); \
        else (pend)->list/**/_tail->next = (elt); \
        (pend)->list/**/_tail = (elt); \
  } while (0)
#endif

static void print_help                  PARAMS ((void));
static void path_include                PARAMS ((cpp_reader *,
                                                 char *, int));
static void initialize_builtins         PARAMS ((cpp_reader *));
static void append_include_chain        PARAMS ((cpp_reader *,
                                                 char *, int, int));
struct file_name_list * remove_dup_dir  PARAMS ((cpp_reader *,
                                                 struct file_name_list *));
struct file_name_list * remove_dup_dirs PARAMS ((cpp_reader *,
                                                 struct file_name_list *));
static void merge_include_chains        PARAMS ((cpp_reader *));

static void initialize_dependency_output PARAMS ((cpp_reader *));
static void initialize_standard_includes PARAMS ((cpp_reader *));
static void new_pending_directive       PARAMS ((struct cpp_pending *,
                                                 const char *,
                                                 cl_directive_handler));
#ifdef HOST_EBCDIC
static int opt_comp                     PARAMS ((const void *, const void *));
#endif
static int parse_option                 PARAMS ((const char *));

/* Fourth argument to append_include_chain: chain to use */
enum { QUOTE = 0, BRACKET, SYSTEM, AFTER };

/* If we have designated initializers (GCC >2.7) these tables can be
   initialized, constant data.  Otherwise, they have to be filled in at
   runtime.  */
#if HAVE_DESIGNATED_INITIALIZERS

#define init_IStable()  /* nothing */
#define ISTABLE __extension__ const U_CHAR _cpp_IStable[UCHAR_MAX + 1] = {

#define init_trigraph_map()  /* nothing */
#define TRIGRAPH_MAP \
__extension__ const U_CHAR _cpp_trigraph_map[UCHAR_MAX + 1] = {

#define END };
#define s(p, v) [p] = v,

#else

#define ISTABLE unsigned char _cpp_IStable[UCHAR_MAX + 1] = { 0 }; \
 static void init_IStable PARAMS ((void)) { \
 unsigned char *x = _cpp_IStable;

#define TRIGRAPH_MAP U_CHAR _cpp_trigraph_map[UCHAR_MAX + 1] = { 0 }; \
 static void init_trigraph_map PARAMS ((void)) { \
 unsigned char *x = _cpp_trigraph_map;

#define END }
#define s(p, v) x[p] = v;

#endif

#define A(x) s(x, ISidnum|ISidstart)
#define N(x) s(x, ISidnum|ISnumstart)
#define H(x) s(x, IShspace|ISspace)
#define V(x) s(x, ISvspace|ISspace)
#define S(x) s(x, ISspace)

ISTABLE
  A('_')

  A('a') A('b') A('c') A('d') A('e') A('f') A('g') A('h') A('i')
  A('j') A('k') A('l') A('m') A('n') A('o') A('p') A('q') A('r')
  A('s') A('t') A('u') A('v') A('w') A('x') A('y') A('z')

  A('A') A('B') A('C') A('D') A('E') A('F') A('G') A('H') A('I')
  A('J') A('K') A('L') A('M') A('N') A('O') A('P') A('Q') A('R')
  A('S') A('T') A('U') A('V') A('W') A('X') A('Y') A('Z')

  N('1') N('2') N('3') N('4') N('5') N('6') N('7') N('8') N('9') N('0')

  H(' ') H('\t')

  V('\n') V('\r')

  S('\0') S('\v') S('\f')
END

TRIGRAPH_MAP
  s('=', '#')   s(')', ']')     s('!', '|')
  s('(', '[')   s('\'', '^')    s('>', '}')
  s('/', '\\')  s('<', '{')     s('-', '~')
END

#undef A
#undef N
#undef H
#undef V
#undef S
#undef s
#undef ISTABLE
#undef END
#undef TRIGRAPH_MAP

/* Given a colon-separated list of file names PATH,
   add all the names to the search path for include files.  */

static void
path_include (pfile, list, path)
     cpp_reader *pfile;
     char *list;
     int path;
{
  char *p, *q, *name;

  p = list;

  do
    {
      /* Find the end of this name.  */
      q = p;
      while (*q != 0 && *q != PATH_SEPARATOR) q++;
      if (q == p)
        {
          /* An empty name in the path stands for the current directory.  */
          name = (char *) xmalloc (2);
          name[0] = '.';
          name[1] = 0;
        }
      else
        {
          /* Otherwise use the directory that is named.  */
          name = (char *) xmalloc (q - p + 1);
          memcpy (name, p, q - p);
          name[q - p] = 0;
        }

      append_include_chain (pfile, name, path, 0);

      /* Advance past this name.  */
      if (*q == 0)
        break;
      p = q + 1;
    }
  while (1);
}

/* Append DIR to include path PATH.  DIR must be permanently allocated
   and writable. */
static void
append_include_chain (pfile, dir, path, cxx_aware)
     cpp_reader *pfile;
     char *dir;
     int path;
     int cxx_aware;
{
  struct cpp_pending *pend = CPP_OPTION (pfile, pending);
  struct file_name_list *new;
  struct stat st;
  unsigned int len;

  _cpp_simplify_pathname (dir);
  if (stat (dir, &st))
    {
      /* Dirs that don't exist are silently ignored. */
      if (errno != ENOENT)
        cpp_notice_from_errno (pfile, dir);
      else if (CPP_OPTION (pfile, verbose))
        fprintf (stderr, _("ignoring nonexistent directory \"%s\"\n"), dir);
      return;
    }

  if (!S_ISDIR (st.st_mode))
    {
      cpp_notice (pfile, "%s: Not a directory", dir);
      return;
    }

  len = strlen (dir);
  if (len > pfile->max_include_len)
    pfile->max_include_len = len;

  new = (struct file_name_list *) xmalloc (sizeof (struct file_name_list));
  new->name = dir;
  new->nlen = len;
  new->ino  = st.st_ino;
  new->dev  = st.st_dev;
  if (path == SYSTEM)
    new->sysp = cxx_aware ? 1 : 2;
  else
    new->sysp = 0;
  new->name_map = NULL;
  new->next = NULL;
  new->alloc = NULL;

  switch (path)
    {
    case QUOTE:         APPEND (pend, quote, new); break;
    case BRACKET:       APPEND (pend, brack, new); break;
    case SYSTEM:        APPEND (pend, systm, new); break;
    case AFTER:         APPEND (pend, after, new); break;
    }
}

/* Handle a duplicated include path.  PREV is the link in the chain
   before the duplicate.  The duplicate is removed from the chain and
   freed.  Returns PREV.  */
struct file_name_list *
remove_dup_dir (pfile, prev)
     cpp_reader *pfile;
     struct file_name_list *prev;
{
  struct file_name_list *cur = prev->next;

  if (CPP_OPTION (pfile, verbose))
    fprintf (stderr, _("ignoring duplicate directory \"%s\"\n"), cur->name);

  prev->next = cur->next;
  free (cur->name);
  free (cur);

  return prev;
}

/* Remove duplicate directories from a chain.  Returns the tail of the
   chain, or NULL if the chain is empty.  This algorithm is quadratic
   in the number of -I switches, which is acceptable since there
   aren't usually that many of them.  */
struct file_name_list *
remove_dup_dirs (pfile, head)
     cpp_reader *pfile;
     struct file_name_list *head;
{
  struct file_name_list *prev = NULL, *cur, *other;

  for (cur = head; cur; cur = cur->next)
    {
      for (other = head; other != cur; other = other->next)
        if (INO_T_EQ (cur->ino, other->ino) && cur->dev == other->dev)
          {
            cur = remove_dup_dir (pfile, prev);
            break;
          }
      prev = cur;
    }

  return prev;
}

/* Merge the four include chains together in the order quote, bracket,
   system, after.  Remove duplicate dirs (as determined by
   INO_T_EQ()).  The system_include and after_include chains are never
   referred to again after this function; all access is through the
   bracket_include path.

   For the future: Check if the directory is empty (but
   how?) and possibly preload the include hash. */

static void
merge_include_chains (pfile)
     cpp_reader *pfile;
{
  struct file_name_list *quote, *brack, *systm, *qtail;

  struct cpp_pending *pend = CPP_OPTION (pfile, pending);

  quote = pend->quote_head;
  brack = pend->brack_head;
  systm = pend->systm_head;
  qtail = pend->quote_tail;

  /* Paste together bracket, system, and after include chains.  */
  if (systm)
    pend->systm_tail->next = pend->after_head;
  else
    systm = pend->after_head;

  if (brack)
    pend->brack_tail->next = systm;
  else
    brack = systm;

  /* This is a bit tricky.  First we drop dupes from the quote-include
     list.  Then we drop dupes from the bracket-include list.
     Finally, if qtail and brack are the same directory, we cut out
     brack.

     We can't just merge the lists and then uniquify them because
     then we may lose directories from the <> search path that should
     be there; consider -Ifoo -Ibar -I- -Ifoo -Iquux. It is however
     safe to treat -Ibar -Ifoo -I- -Ifoo -Iquux as if written
     -Ibar -I- -Ifoo -Iquux.  */

  remove_dup_dirs (pfile, brack);
  qtail = remove_dup_dirs (pfile, quote);

  if (quote)
    {
      qtail->next = brack;

      /* If brack == qtail, remove brack as it's simpler.  */
      if (INO_T_EQ (qtail->ino, brack->ino) && qtail->dev == brack->dev)
        brack = remove_dup_dir (pfile, qtail);
    }
  else
      quote = brack;

  CPP_OPTION (pfile, quote_include) = quote;
  CPP_OPTION (pfile, bracket_include) = brack;
}

/* cpp_init initializes library global state.  It might not need to do
   anything depending on the platform and compiler, so we have a static
   flag to make sure it gets called before cpp_reader_init.  */

static int cpp_init_completed = 0;

void
cpp_init ()
{
#ifdef HOST_EBCDIC
  /* For non-ASCII hosts, the cl_options array needs to be sorted at
     runtime.  */
  qsort (cl_options, N_OPTS, sizeof (struct cl_option), opt_comp);
#endif

  /* Set up the trigraph map and the IStable.  These don't need to do
     anything if we were compiled with a compiler that supports C99
     designated initializers.  */
  init_trigraph_map ();
  init_IStable ();

  cpp_init_completed = 1;
}

/* Initialize a cpp_reader structure. */
void
cpp_reader_init (pfile)
     cpp_reader *pfile;
{
  memset ((char *) pfile, 0, sizeof (cpp_reader));

  CPP_OPTION (pfile, dollars_in_ident) = 1;
  CPP_OPTION (pfile, cplusplus_comments) = 1;
  CPP_OPTION (pfile, warn_import) = 1;
  CPP_OPTION (pfile, warn_paste) = 1;
  CPP_OPTION (pfile, digraphs) = 1;
  CPP_OPTION (pfile, discard_comments) = 1;
  CPP_OPTION (pfile, show_column) = 1;
  CPP_OPTION (pfile, tabstop) = 8;

  CPP_OPTION (pfile, pending) =
    (struct cpp_pending *) xcalloc (1, sizeof (struct cpp_pending));

  /* If cpp_init hasn't been called, generate a fatal error (by hand)
     and call it here.  */
  if (!cpp_init_completed)
    {
      fputs ("cpp_reader_init: internal error: cpp_init not called.\n", stderr);
      pfile->errors = CPP_FATAL_LIMIT;
      cpp_init ();
    }

  _cpp_init_macros (pfile);
  _cpp_init_stacks (pfile);
  _cpp_init_includes (pfile);
  _cpp_init_internal_pragmas (pfile);
}

/* Initialize a cpp_printer structure.  As a side effect, open the
   output file.  */
cpp_printer *
cpp_printer_init (pfile, print)
     cpp_reader *pfile;
     cpp_printer *print;
{
  memset (print, '\0', sizeof (cpp_printer));
  if (CPP_OPTION (pfile, out_fname) == NULL)
    CPP_OPTION (pfile, out_fname) = "";
  
  if (CPP_OPTION (pfile, out_fname)[0] == '\0')
    print->outf = stdout;
  else
    {
      print->outf = fopen (CPP_OPTION (pfile, out_fname), "w");
      if (! print->outf)
        {
          cpp_notice_from_errno (pfile, CPP_OPTION (pfile, out_fname));
          return NULL;
        }
    }
  return print;
}

/* Free resources used by PFILE.
   This is the cpp_reader 'finalizer' or 'destructor' (in C++ terminology).  */
void
cpp_cleanup (pfile)
     cpp_reader *pfile;
{
  struct file_name_list *dir, *next;

  while (CPP_BUFFER (pfile) != NULL)
    cpp_pop_buffer (pfile);

  if (pfile->deps)
    deps_free (pfile->deps);

  if (pfile->spec_nodes)
    free (pfile->spec_nodes);

  _cpp_free_temp_tokens (pfile);
  _cpp_cleanup_includes (pfile);
  _cpp_cleanup_stacks (pfile);
  _cpp_cleanup_macros (pfile);

  for (dir = CPP_OPTION (pfile, quote_include); dir; dir = next)
    {
      next = dir->next;
      free (dir->name);
      free (dir);
    }
}


/* This structure defines one built-in macro.  A node of type TYPE will
   be entered in the macro hash table under the name NAME, with value
   VALUE (if any).  If TYPE is T_OPERATOR, the CODE field is used instead.

   Two values are not compile time constants, so we tag
   them in the FLAGS field instead:
   VERS         value is the global version_string, quoted
   ULP          value is the global user_label_prefix

   Also, macros with CPLUS set in the flags field are entered only for C++.
 */

struct builtin
{
  const U_CHAR *name;
  const char *value;
  unsigned char code;
  unsigned char type;
  unsigned short flags;
  unsigned int len;
};
#define VERS  0x01
#define ULP   0x02
#define CPLUS 0x04

#define B(n, t)       { U n, 0, 0, t,          0, sizeof n - 1 }
#define C(n, v)       { U n, v, 0, T_MACRO,    0, sizeof n - 1 }
#define X(n, f)       { U n, 0, 0, T_MACRO,    f, sizeof n - 1 }
#define O(n, c, f)    { U n, 0, c, T_OPERATOR, f, sizeof n - 1 }
static const struct builtin builtin_array[] =
{
  B("__TIME__",          T_TIME),
  B("__DATE__",          T_DATE),
  B("__FILE__",          T_FILE),
  B("__BASE_FILE__",     T_BASE_FILE),
  B("__LINE__",          T_SPECLINE),
  B("__INCLUDE_LEVEL__", T_INCLUDE_LEVEL),
  B("__STDC__",          T_STDC),

  X("__VERSION__",              VERS),
  X("__USER_LABEL_PREFIX__",    ULP),
  C("__REGISTER_PREFIX__",      REGISTER_PREFIX),
  C("__HAVE_BUILTIN_SETJMP__",  "1"),
#ifndef NO_BUILTIN_SIZE_TYPE
  C("__SIZE_TYPE__",            SIZE_TYPE),
#endif
#ifndef NO_BUILTIN_PTRDIFF_TYPE
  C("__PTRDIFF_TYPE__",         PTRDIFF_TYPE),
#endif
#ifndef NO_BUILTIN_WCHAR_TYPE
  C("__WCHAR_TYPE__",           WCHAR_TYPE),
#endif
#ifndef NO_BUILTIN_WINT_TYPE
  C("__WINT_TYPE__",            WINT_TYPE),
#endif

  /* Named operators known to the preprocessor.  These cannot be #defined
     and always have their stated meaning.  They are treated like normal
     string tokens except for the type code and the meaning.  Most of them
     are only for C++ (but see iso646.h).  */
  O("defined",  CPP_DEFINED, 0),
  O("and",      CPP_AND_AND, CPLUS),
  O("and_eq",   CPP_AND_EQ,  CPLUS),
  O("bitand",   CPP_AND,     CPLUS),
  O("bitor",    CPP_OR,      CPLUS),
  O("compl",    CPP_COMPL,   CPLUS),
  O("not",      CPP_NOT,     CPLUS),
  O("not_eq",   CPP_NOT_EQ,  CPLUS),
  O("or",       CPP_OR_OR,   CPLUS),
  O("or_eq",    CPP_OR_EQ,   CPLUS),
  O("xor",      CPP_XOR,     CPLUS),
  O("xor_eq",   CPP_XOR_EQ,  CPLUS),
};
#undef B
#undef C
#undef X
#define builtin_array_end \
 builtin_array + sizeof(builtin_array)/sizeof(struct builtin)

/* Subroutine of cpp_start_read; reads the builtins table above and
   enters the macros into the hash table.  */
static void
initialize_builtins (pfile)
     cpp_reader *pfile;
{
  const struct builtin *b;

  for(b = builtin_array; b < builtin_array_end; b++)
    {
      if (b->flags & CPLUS && ! CPP_OPTION (pfile, cplusplus))
        continue;

      if (b->type == T_MACRO)
        {
          const char *val;
          char *str;

          if (b->flags & VERS)
            {
              /* Allocate enough space for 'name "value"\n\0'.  */
              str = alloca (b->len + strlen (version_string) + 5);
              sprintf (str, "%s \"%s\"\n", b->name, version_string);
            }
          else
            {
              if (b->flags & ULP)
                val = CPP_OPTION (pfile, user_label_prefix);
              else
                val = b->value;

              /* Allocate enough space for "name value\n\0".  */
              str = alloca (b->len + strlen (val) + 3);
              sprintf(str, "%s %s\n", b->name, val);
            }

          _cpp_define_builtin (pfile, str);
        }
      else
        {
          cpp_hashnode *hp = cpp_lookup (pfile, b->name, b->len);
          hp->type = b->type;
          if (b->type == T_OPERATOR)
            hp->value.code = b->code;
        }
    }
}
#undef VERS
#undef ULP
#undef builtin_array_end

/* Another subroutine of cpp_start_read.  This one sets up to do
   dependency-file output. */
static void
initialize_dependency_output (pfile)
     cpp_reader *pfile;
{
  char *spec, *s, *output_file;

  /* Either of two environment variables can specify output of deps.
     Its value is either "OUTPUT_FILE" or "OUTPUT_FILE DEPS_TARGET",
     where OUTPUT_FILE is the file to write deps info to
     and DEPS_TARGET is the target to mention in the deps.  */

  if (CPP_OPTION (pfile, print_deps) == 0)
    {
      spec = getenv ("DEPENDENCIES_OUTPUT");
      if (spec)
        CPP_OPTION (pfile, print_deps) = 1;
      else
        {
          spec = getenv ("SUNPRO_DEPENDENCIES");
          if (spec)
            CPP_OPTION (pfile, print_deps) = 2;
          else
            return;
        }

      /* Find the space before the DEPS_TARGET, if there is one.  */
      s = strchr (spec, ' ');
      if (s)
        {
          CPP_OPTION (pfile, deps_target) = s + 1;
          output_file = (char *) xmalloc (s - spec + 1);
          memcpy (output_file, spec, s - spec);
          output_file[s - spec] = 0;
        }
      else
        {
          CPP_OPTION (pfile, deps_target) = 0;
          output_file = spec;
        }

      CPP_OPTION (pfile, deps_file) = output_file;
      CPP_OPTION (pfile, print_deps_append) = 1;
    }

  pfile->deps = deps_init ();

  /* Print the expected object file name as the target of this Make-rule.  */
  if (CPP_OPTION (pfile, deps_target))
    deps_add_target (pfile->deps, CPP_OPTION (pfile, deps_target));
  else if (*CPP_OPTION (pfile, in_fname) == 0)
    deps_add_target (pfile->deps, "-");
  else
    deps_calc_target (pfile->deps, CPP_OPTION (pfile, in_fname));

  if (CPP_OPTION (pfile, in_fname))
    deps_add_dep (pfile->deps, CPP_OPTION (pfile, in_fname));
}

/* And another subroutine.  This one sets up the standard include path.  */
static void
initialize_standard_includes (pfile)
     cpp_reader *pfile;
{
  char *path;
  const struct default_include *p;
  const char *specd_prefix = CPP_OPTION (pfile, include_prefix);

  /* Several environment variables may add to the include search path.
     CPATH specifies an additional list of directories to be searched
     as if specified with -I, while C_INCLUDE_PATH, CPLUS_INCLUDE_PATH,
     etc. specify an additional list of directories to be searched as
     if specified with -isystem, for the language indicated.  */

  GET_ENV_PATH_LIST (path, "CPATH");
  if (path != 0 && *path != 0)
    path_include (pfile, path, BRACKET);

  switch ((CPP_OPTION (pfile, objc) << 1) + CPP_OPTION (pfile, cplusplus))
    {
    case 0:
      GET_ENV_PATH_LIST (path, "C_INCLUDE_PATH");
      break;
    case 1:
      GET_ENV_PATH_LIST (path, "CPLUS_INCLUDE_PATH");
      break;
    case 2:
      GET_ENV_PATH_LIST (path, "OBJC_INCLUDE_PATH");
      break;
    case 3:
      GET_ENV_PATH_LIST (path, "OBJCPLUS_INCLUDE_PATH");
      break;
    }
  if (path != 0 && *path != 0)
    path_include (pfile, path, SYSTEM);

  /* Search "translated" versions of GNU directories.
     These have /usr/local/lib/gcc... replaced by specd_prefix.  */
  if (specd_prefix != 0 && cpp_GCC_INCLUDE_DIR_len)
    {
      /* Remove the `include' from /usr/local/lib/gcc.../include.
         GCC_INCLUDE_DIR will always end in /include. */
      int default_len = cpp_GCC_INCLUDE_DIR_len;
      char *default_prefix = (char *) alloca (default_len + 1);
      int specd_len = strlen (specd_prefix);

      memcpy (default_prefix, cpp_GCC_INCLUDE_DIR, default_len);
      default_prefix[default_len] = '\0';

      for (p = cpp_include_defaults; p->fname; p++)
        {
          /* Some standard dirs are only for C++.  */
          if (!p->cplusplus
              || (CPP_OPTION (pfile, cplusplus)
                  && !CPP_OPTION (pfile, no_standard_cplusplus_includes)))
            {
              /* Does this dir start with the prefix?  */
              if (!memcmp (p->fname, default_prefix, default_len))
                {
                  /* Yes; change prefix and add to search list.  */
                  int flen = strlen (p->fname);
                  int this_len = specd_len + flen - default_len;
                  char *str = (char *) xmalloc (this_len + 1);
                  memcpy (str, specd_prefix, specd_len);
                  memcpy (str + specd_len,
                          p->fname + default_len,
                          flen - default_len + 1);

                  append_include_chain (pfile, str, SYSTEM, p->cxx_aware);
                }
            }
        }
    }

  /* Search ordinary names for GNU include directories.  */
  for (p = cpp_include_defaults; p->fname; p++)
    {
      /* Some standard dirs are only for C++.  */
      if (!p->cplusplus
          || (CPP_OPTION (pfile, cplusplus)
              && !CPP_OPTION (pfile, no_standard_cplusplus_includes)))
        {
          /* XXX Potential memory leak! */
          char *str = xstrdup (update_path (p->fname, p->component));
          append_include_chain (pfile, str, SYSTEM, p->cxx_aware);
        }
    }
}

/* This is called after options have been processed.
 * Check options for consistency, and setup for processing input
 * from the file named FNAME.  (Use standard input if FNAME==NULL.)
 * Return 1 on success, 0 on failure.
 */

int
cpp_start_read (pfile, print, fname)
     cpp_reader *pfile;
     cpp_printer *print;
     const char *fname;
{
  struct pending_option *p, *q;

  /* -MG doesn't select the form of output and must be specified with one of
     -M or -MM.  -MG doesn't make sense with -MD or -MMD since they don't
     inhibit compilation.  */
  if (CPP_OPTION (pfile, print_deps_missing_files)
      && (CPP_OPTION (pfile, print_deps) == 0
          || !CPP_OPTION (pfile, no_output)))
    {
      cpp_fatal (pfile, "-MG must be specified with one of -M or -MM");
      return 0;
    }

  /* -Wtraditional is not useful in C++ mode.  */
  if (CPP_OPTION (pfile, cplusplus))
    CPP_OPTION (pfile, warn_traditional) = 0;

  /* Do not warn about invalid token pasting if -lang-asm.  */
  if (CPP_OPTION (pfile, lang_asm))
    CPP_OPTION (pfile, warn_paste) = 0;

  /* Set this if it hasn't been set already. */
  if (CPP_OPTION (pfile, user_label_prefix) == NULL)
    CPP_OPTION (pfile, user_label_prefix) = USER_LABEL_PREFIX;

  /* Figure out if we need to save function macro parameter spellings.
     We don't use CPP_PEDANTIC() here because that depends on whether
     or not the current file is a system header, and there is no
     current file yet.  */
  pfile->save_parameter_spellings =
    CPP_OPTION (pfile, pedantic)
    || CPP_OPTION (pfile, debug_output)
    || CPP_OPTION (pfile, dump_macros) == dump_definitions
    || CPP_OPTION (pfile, dump_macros) == dump_only;

  /* Set up the tables used by read_and_prescan.  */
  _cpp_init_input_buffer (pfile);

  /* Set up the include search path now.  */
  if (! CPP_OPTION (pfile, no_standard_includes))
    initialize_standard_includes (pfile);

  merge_include_chains (pfile);

  /* With -v, print the list of dirs to search.  */
  if (CPP_OPTION (pfile, verbose))
    {
      struct file_name_list *l;
      fprintf (stderr, _("#include \"...\" search starts here:\n"));
      for (l = CPP_OPTION (pfile, quote_include); l; l = l->next)
        {
          if (l == CPP_OPTION (pfile, bracket_include))
            fprintf (stderr, _("#include <...> search starts here:\n"));
          fprintf (stderr, " %s\n", l->name);
        }
      fprintf (stderr, _("End of search list.\n"));
    }

  /* Open the main input file.  This must be done early, so we have a
     buffer to stand on.  */
  if (CPP_OPTION (pfile, in_fname) == NULL
      || *CPP_OPTION (pfile, in_fname) == 0)
    {
      CPP_OPTION (pfile, in_fname) = fname;
      if (CPP_OPTION (pfile, in_fname) == NULL)
        CPP_OPTION (pfile, in_fname) = "";
    }
  if (CPP_OPTION (pfile, out_fname) == NULL)
    CPP_OPTION (pfile, out_fname) = "";

  if (!cpp_read_file (pfile, fname))
    return 0;

  initialize_dependency_output (pfile);

  /* Install __LINE__, etc.  */
  initialize_builtins (pfile);

  /* Do -U's, -D's and -A's in the order they were seen.  */
  p = CPP_OPTION (pfile, pending)->directive_head;
  while (p)
    {
      (*p->handler) (pfile, p->arg);
      q = p->next;
      free (p);
      p = q;
    }
  pfile->done_initializing = 1;

  /* We start at line 1 of the main input file.  */
  if (print)
    {
      print->last_fname = CPP_BUFFER (pfile)->nominal_fname;
      print->lineno = 1;
    }

  /* The -imacros files can be scanned now, but the -include files
     have to be pushed onto the include stack and processed later,
     in the main loop calling cpp_get_token.  */

  p = CPP_OPTION (pfile, pending)->imacros_head;
  while (p)
    {
      if (cpp_read_file (pfile, p->arg))
        cpp_scan_buffer_nooutput (pfile);
      q = p->next;
      free (p);
      p = q;
    }

  p = CPP_OPTION (pfile, pending)->include_head;
  while (p)
    {
      cpp_read_file (pfile, p->arg);
      q = p->next;
      free (p);
      p = q;
    }

  free (CPP_OPTION (pfile, pending));
  CPP_OPTION (pfile, pending) = NULL;

  return 1;
}

/* This is called at the end of preprocessing.  It pops the
   last buffer and writes dependency output.  It should also
   clear macro definitions, such that you could call cpp_start_read
   with a new filename to restart processing. */
void
cpp_finish (pfile, print)
     cpp_reader *pfile;
     cpp_printer *print;
{
  if (CPP_BUFFER (pfile))
    {
      cpp_ice (pfile, "buffers still stacked in cpp_finish");
      while (CPP_BUFFER (pfile))
        cpp_pop_buffer (pfile);
    }

  /* Don't write the deps file if preprocessing has failed.  */
  if (CPP_OPTION (pfile, print_deps) && pfile->errors == 0)
    {
      /* Stream on which to print the dependency information.  */
      FILE *deps_stream = 0;
      const char *deps_mode
        = CPP_OPTION (pfile, print_deps_append) ? "a" : "w";
      if (CPP_OPTION (pfile, deps_file) == 0)
        deps_stream = stdout;
      else
        {
          deps_stream = fopen (CPP_OPTION (pfile, deps_file), deps_mode);
          if (deps_stream == 0)
            cpp_notice_from_errno (pfile, CPP_OPTION (pfile, deps_file));
        }
      if (deps_stream)
        {
          deps_write (pfile->deps, deps_stream, 72);
          if (CPP_OPTION (pfile, deps_file))
            {
              if (ferror (deps_stream) || fclose (deps_stream) != 0)
                cpp_fatal (pfile, "I/O error on output");
            }
        }
    }

  /* Flush any pending output.  */
  if (print)
    {
      if (pfile->need_newline)
        putc ('\n', print->outf);
      if (ferror (print->outf) || fclose (print->outf))
        cpp_notice_from_errno (pfile, CPP_OPTION (pfile, out_fname));
    }

  /* Report on headers that could use multiple include guards.  */
  if (CPP_OPTION (pfile, print_include_names))
    _cpp_report_missing_guards (pfile);
}

static void
new_pending_directive (pend, text, handler)
     struct cpp_pending *pend;
     const char *text;
     cl_directive_handler handler;
{
  struct pending_option *o = (struct pending_option *)
    xmalloc (sizeof (struct pending_option));

  o->arg = text;
  o->next = NULL;
  o->handler = handler;
  APPEND (pend, directive, o);
}

/* Irix6 "cc -n32" and OSF4 cc have problems with char foo[] = ("string");
   I.e. a const string initializer with parens around it.  That is
   what N_("string") resolves to, so we make no_* be macros instead.  */
#define no_arg N_("Argument missing after %s")
#define no_ass N_("Assertion missing after %s")
#define no_dir N_("Directory name missing after %s")
#define no_fil N_("File name missing after %s")
#define no_mac N_("Macro name missing after %s")
#define no_pth N_("Path name missing after %s")
#define no_num N_("Number missing after %s")

/* This is the list of all command line options, with the leading
   "-" removed.  It must be sorted in ASCII collating order.  */
#define COMMAND_LINE_OPTIONS                                                  \
  DEF_OPT("",                         0,      OPT_stdin_stdout)               \
  DEF_OPT("$",                        0,      OPT_dollar)                     \
  DEF_OPT("+",                        0,      OPT_plus)                       \
  DEF_OPT("-help",                    0,      OPT__help)                      \
  DEF_OPT("-version",                 0,      OPT__version)                   \
  DEF_OPT("A",                        no_ass, OPT_A)                          \
  DEF_OPT("C",                        0,      OPT_C)                          \
  DEF_OPT("D",                        no_mac, OPT_D)                          \
  DEF_OPT("H",                        0,      OPT_H)                          \
  DEF_OPT("I",                        no_dir, OPT_I)                          \
  DEF_OPT("M",                        0,      OPT_M)                          \
  DEF_OPT("MD",                       no_fil, OPT_MD)                         \
  DEF_OPT("MG",                       0,      OPT_MG)                         \
  DEF_OPT("MM",                       0,      OPT_MM)                         \
  DEF_OPT("MMD",                      no_fil, OPT_MMD)                        \
  DEF_OPT("P",                        0,      OPT_P)                          \
  DEF_OPT("U",                        no_mac, OPT_U)                          \
  DEF_OPT("W",                        no_arg, OPT_W)  /* arg optional */      \
  DEF_OPT("d",                        no_arg, OPT_d)                          \
  DEF_OPT("fleading-underscore",      0,      OPT_fleading_underscore)        \
  DEF_OPT("fno-leading-underscore",   0,      OPT_fno_leading_underscore)     \
  DEF_OPT("fno-preprocessed",         0,      OPT_fno_preprocessed)           \
  DEF_OPT("fno-show-column",          0,      OPT_fno_show_column)            \
  DEF_OPT("fpreprocessed",            0,      OPT_fpreprocessed)              \
  DEF_OPT("fshow-column",             0,      OPT_fshow_column)               \
  DEF_OPT("ftabstop=",                no_num, OPT_ftabstop)                   \
  DEF_OPT("g",                        no_arg, OPT_g)  /* arg optional */      \
  DEF_OPT("h",                        0,      OPT_h)                          \
  DEF_OPT("idirafter",                no_dir, OPT_idirafter)                  \
  DEF_OPT("imacros",                  no_fil, OPT_imacros)                    \
  DEF_OPT("include",                  no_fil, OPT_include)                    \
  DEF_OPT("iprefix",                  no_pth, OPT_iprefix)                    \
  DEF_OPT("isystem",                  no_dir, OPT_isystem)                    \
  DEF_OPT("iwithprefix",              no_dir, OPT_iwithprefix)                \
  DEF_OPT("iwithprefixbefore",        no_dir, OPT_iwithprefixbefore)          \
  DEF_OPT("lang-asm",                 0,      OPT_lang_asm)                   \
  DEF_OPT("lang-c",                   0,      OPT_lang_c)                     \
  DEF_OPT("lang-c++",                 0,      OPT_lang_cplusplus)             \
  DEF_OPT("lang-c89",                 0,      OPT_lang_c89)                   \
  DEF_OPT("lang-objc",                0,      OPT_lang_objc)                  \
  DEF_OPT("lang-objc++",              0,      OPT_lang_objcplusplus)          \
  DEF_OPT("nostdinc",                 0,      OPT_nostdinc)                   \
  DEF_OPT("nostdinc++",               0,      OPT_nostdincplusplus)           \
  DEF_OPT("o",                        no_fil, OPT_o)                          \
  DEF_OPT("pedantic",                 0,      OPT_pedantic)                   \
  DEF_OPT("pedantic-errors",          0,      OPT_pedantic_errors)            \
  DEF_OPT("remap",                    0,      OPT_remap)                      \
  DEF_OPT("std=c89",                  0,      OPT_std_c89)                    \
  DEF_OPT("std=c99",                  0,      OPT_std_c99)                    \
  DEF_OPT("std=c9x",                  0,      OPT_std_c9x)                    \
  DEF_OPT("std=gnu89",                0,      OPT_std_gnu89)                  \
  DEF_OPT("std=gnu99",                0,      OPT_std_gnu99)                  \
  DEF_OPT("std=gnu9x",                0,      OPT_std_gnu9x)                  \
  DEF_OPT("std=iso9899:1990",         0,      OPT_std_iso9899_1990)           \
  DEF_OPT("std=iso9899:199409",       0,      OPT_std_iso9899_199409)         \
  DEF_OPT("std=iso9899:1999",         0,      OPT_std_iso9899_1999)           \
  DEF_OPT("std=iso9899:199x",         0,      OPT_std_iso9899_199x)           \
  DEF_OPT("trigraphs",                0,      OPT_trigraphs)                  \
  DEF_OPT("v",                        0,      OPT_v)                          \
  DEF_OPT("w",                        0,      OPT_w)

#define DEF_OPT(text, msg, code) code,
enum opt_code
{
  COMMAND_LINE_OPTIONS
  N_OPTS
};
#undef DEF_OPT

struct cl_option
{
  const char *opt_text;
  const char *msg;
  size_t opt_len;
  enum opt_code opt_code;
};

#define DEF_OPT(text, msg, code) { text, msg, sizeof(text) - 1, code },
#ifdef HOST_EBCDIC
static struct cl_option cl_options[] =
#else
static const struct cl_option cl_options[] =
#endif
{
  COMMAND_LINE_OPTIONS
};
#undef DEF_OPT
#undef COMMAND_LINE_OPTIONS

/* Perform a binary search to find which, if any, option the given
   command-line matches.  Returns its index in the option array,
   negative on failure.  Complications arise since some options can be
   suffixed with an argument, and multiple complete matches can occur,
   e.g. -iwithprefix and -iwithprefixbefore.  Moreover, we want to
   accept options beginning with -g and -W that we do not recognise,
   but not to swallow any subsequent command line argument; these are
   handled as special cases in cpp_handle_option */
static int
parse_option (input)
     const char *input;
{
  unsigned int md, mn, mx;
  size_t opt_len;
  int comp;

  mn = 0;
  mx = N_OPTS;

  while (mx > mn)
    {
      md = (mn + mx) / 2;

      opt_len = cl_options[md].opt_len;
      comp = memcmp (input, cl_options[md].opt_text, opt_len);

      if (comp > 0)
        mn = md + 1;
      else if (comp < 0)
        mx = md;
      else
        {
          if (input[opt_len] == '\0')
            return md;
          /* We were passed more text.  If the option takes an argument,
             we may match a later option or we may have been passed the
             argument.  The longest possible option match succeeds.
             If the option takes no arguments we have not matched and
             continue the search (e.g. input="stdc++" match was "stdc") */
          mn = md + 1;
          if (cl_options[md].msg)
            {
              /* Scan forwards.  If we get an exact match, return it.
                 Otherwise, return the longest option-accepting match.
                 This loops no more than twice with current options */
              mx = md;
              for (; mn < N_OPTS; mn++)
                {
                  opt_len = cl_options[mn].opt_len;
                  if (memcmp (input, cl_options[mn].opt_text, opt_len))
                    break;
                  if (input[opt_len] == '\0')
                    return mn;
                  if (cl_options[mn].msg)
                    mx = mn;
                }
              return mx;
            }
        }
    }

  return -1;
}

/* Handle one command-line option in (argc, argv).
   Can be called multiple times, to handle multiple sets of options.
   Returns number of strings consumed.  */

int
cpp_handle_option (pfile, argc, argv)
     cpp_reader *pfile;
     int argc;
     char **argv;
{
  int i = 0;
  struct cpp_pending *pend = CPP_OPTION (pfile, pending);

  if (argv[i][0] != '-')
    {
      if (CPP_OPTION (pfile, out_fname) != NULL)
        cpp_fatal (pfile, "Too many arguments. Type %s --help for usage info",
                   progname);
      else if (CPP_OPTION (pfile, in_fname) != NULL)
        CPP_OPTION (pfile, out_fname) = argv[i];
      else
        CPP_OPTION (pfile, in_fname) = argv[i];
    }
  else
    {
      enum opt_code opt_code;
      int opt_index;
      const char *arg = 0;

      /* Skip over '-' */
      opt_index = parse_option (&argv[i][1]);
      if (opt_index < 0)
        return i;

      opt_code = cl_options[opt_index].opt_code;
      if (cl_options[opt_index].msg)
        {
          arg = &argv[i][cl_options[opt_index].opt_len + 1];

          /* Yuk. Special case for -g and -W as they must not swallow
             up any following argument.  If this becomes common, add
             another field to the cl_options table */
          if (arg[0] == '\0' && !(opt_code == OPT_g || opt_code == OPT_W))
            {
              arg = argv[++i];
              if (!arg)
                {
                  cpp_fatal (pfile, cl_options[opt_index].msg, argv[i - 1]);
                  return argc;
                }
            }
        }

      switch (opt_code)
        {
        case N_OPTS: /* shut GCC up */
          break;
        case OPT_fleading_underscore:
          CPP_OPTION (pfile, user_label_prefix) = "_";
          break;
        case OPT_fno_leading_underscore:
          CPP_OPTION (pfile, user_label_prefix) = "";
          break;
        case OPT_fpreprocessed:
          CPP_OPTION (pfile, preprocessed) = 1;
          break;
        case OPT_fno_preprocessed:
          CPP_OPTION (pfile, preprocessed) = 0;
          break;
        case OPT_fshow_column:
          CPP_OPTION (pfile, show_column) = 1;
          break;
        case OPT_fno_show_column:
          CPP_OPTION (pfile, show_column) = 0;
          break;
        case OPT_ftabstop:
          /* Silently ignore empty string, non-longs and silly values.  */
          if (arg[0] != '\0')
            {
              char *endptr;
              long tabstop = strtol (arg, &endptr, 10);
              if (*endptr == '\0' && tabstop >= 1 && tabstop <= 100)
                CPP_OPTION (pfile, tabstop) = tabstop;
            }
          break;
        case OPT_w:
          CPP_OPTION (pfile, inhibit_warnings) = 1;
          break;
        case OPT_g:  /* Silently ignore anything but -g3 */
          if (!strcmp(&argv[i][2], "3"))
            CPP_OPTION (pfile, debug_output) = 1;
          break;
        case OPT_h:
        case OPT__help:
          print_help ();
          exit (0);  /* XXX */
          break;
        case OPT__version:
          fprintf (stderr, _("GNU CPP version %s (cpplib)\n"), version_string);
          exit (0);  /* XXX */
          break;
        case OPT_C:
          CPP_OPTION (pfile, discard_comments) = 0;
          break;
        case OPT_P:
          CPP_OPTION (pfile, no_line_commands) = 1;
          break;
        case OPT_dollar:                /* Don't include $ in identifiers.  */
          CPP_OPTION (pfile, dollars_in_ident) = 0;
          break;
        case OPT_H:
          CPP_OPTION (pfile, print_include_names) = 1;
          break;
        case OPT_D:
          new_pending_directive (pend, arg, cpp_define);
          break;
        case OPT_pedantic_errors:
          CPP_OPTION (pfile, pedantic_errors) = 1;
          /* fall through */
        case OPT_pedantic:
          CPP_OPTION (pfile, pedantic) = 1;
          break;
        case OPT_trigraphs:
          CPP_OPTION (pfile, trigraphs) = 1;
          break;
        case OPT_plus:
          CPP_OPTION (pfile, cplusplus) = 1;
          CPP_OPTION (pfile, cplusplus_comments) = 1;
          break;
        case OPT_remap:
          CPP_OPTION (pfile, remap) = 1;
          break;
        case OPT_iprefix:
          CPP_OPTION (pfile, include_prefix) = arg;
          CPP_OPTION (pfile, include_prefix_len) = strlen (arg);
          break;
        case OPT_lang_c:
          CPP_OPTION (pfile, cplusplus) = 0;
          CPP_OPTION (pfile, cplusplus_comments) = 1;
          CPP_OPTION (pfile, c89) = 0;
          CPP_OPTION (pfile, c99) = 1;
          CPP_OPTION (pfile, digraphs) = 1;
          CPP_OPTION (pfile, objc) = 0;
          break;
        case OPT_lang_cplusplus:
          CPP_OPTION (pfile, cplusplus) = 1;
          CPP_OPTION (pfile, cplusplus_comments) = 1;
          CPP_OPTION (pfile, c89) = 0;
          CPP_OPTION (pfile, c99) = 0;
          CPP_OPTION (pfile, objc) = 0;
          CPP_OPTION (pfile, digraphs) = 1;
          new_pending_directive (pend, "__cplusplus", cpp_define);
          break;
        case OPT_lang_objcplusplus:
          CPP_OPTION (pfile, cplusplus) = 1;
          new_pending_directive (pend, "__cplusplus", cpp_define);
          /* fall through */
        case OPT_lang_objc:
          CPP_OPTION (pfile, cplusplus_comments) = 1;
          CPP_OPTION (pfile, c89) = 0;
          CPP_OPTION (pfile, c99) = 0;
          CPP_OPTION (pfile, objc) = 1;
          new_pending_directive (pend, "__OBJC__", cpp_define);
          break;
        case OPT_lang_asm:
          CPP_OPTION (pfile, lang_asm) = 1;
          CPP_OPTION (pfile, dollars_in_ident) = 0;
          new_pending_directive (pend, "__ASSEMBLER__", cpp_define);
          break;
        case OPT_nostdinc:
          /* -nostdinc causes no default include directories.
             You must specify all include-file directories with -I.  */
          CPP_OPTION (pfile, no_standard_includes) = 1;
          break;
        case OPT_nostdincplusplus:
          /* -nostdinc++ causes no default C++-specific include directories. */
          CPP_OPTION (pfile, no_standard_cplusplus_includes) = 1;
          break;
        case OPT_std_gnu89:
          CPP_OPTION (pfile, cplusplus) = 0;
          CPP_OPTION (pfile, cplusplus_comments) = 1;
          CPP_OPTION (pfile, c89) = 1;
          CPP_OPTION (pfile, c99) = 0;
          CPP_OPTION (pfile, objc) = 0;
          CPP_OPTION (pfile, digraphs) = 1;
          break;
        case OPT_std_gnu9x:
        case OPT_std_gnu99:
          CPP_OPTION (pfile, cplusplus) = 0;
          CPP_OPTION (pfile, cplusplus_comments) = 1;
          CPP_OPTION (pfile, c89) = 0;
          CPP_OPTION (pfile, c99) = 1;
          CPP_OPTION (pfile, digraphs) = 1;
          CPP_OPTION (pfile, objc) = 0;
          new_pending_directive (pend, "__STDC_VERSION__=199901L", cpp_define);
          break;
        case OPT_std_iso9899_199409:
          new_pending_directive (pend, "__STDC_VERSION__=199409L", cpp_define);
          /* Fall through */
        case OPT_std_iso9899_1990:
        case OPT_std_c89:
        case OPT_lang_c89:
          CPP_OPTION (pfile, cplusplus) = 0;
          CPP_OPTION (pfile, cplusplus_comments) = 0;
          CPP_OPTION (pfile, c89) = 1;
          CPP_OPTION (pfile, c99) = 0;
          CPP_OPTION (pfile, objc) = 0;
          CPP_OPTION (pfile, digraphs) = opt_code == OPT_std_iso9899_199409;
          CPP_OPTION (pfile, trigraphs) = 1;
          new_pending_directive (pend, "__STRICT_ANSI__", cpp_define);
          break;
        case OPT_std_iso9899_199x:
        case OPT_std_iso9899_1999:
        case OPT_std_c9x:
        case OPT_std_c99:
          CPP_OPTION (pfile, cplusplus) = 0;
          CPP_OPTION (pfile, cplusplus_comments) = 1;
          CPP_OPTION (pfile, c89) = 0;
          CPP_OPTION (pfile, c99) = 1;
          CPP_OPTION (pfile, objc) = 0;
          CPP_OPTION (pfile, digraphs) = 1;
          CPP_OPTION (pfile, trigraphs) = 1;
          new_pending_directive (pend, "__STRICT_ANSI__", cpp_define);
          new_pending_directive (pend, "__STDC_VERSION__=199901L", cpp_define);
          break;
        case OPT_o:
          if (CPP_OPTION (pfile, out_fname) != NULL)
            {
              cpp_fatal (pfile, "Output filename specified twice");
              return argc;
            }
          CPP_OPTION (pfile, out_fname) = arg;
          if (!strcmp (CPP_OPTION (pfile, out_fname), "-"))
            CPP_OPTION (pfile, out_fname) = "";
          break;
        case OPT_v:
          fprintf (stderr, _("GNU CPP version %s (cpplib)"), version_string);
#ifdef TARGET_VERSION
          TARGET_VERSION;
#endif
          fputc ('\n', stderr);
          CPP_OPTION (pfile, verbose) = 1;
          break;
        case OPT_stdin_stdout:
          /* JF handle '-' as file name meaning stdin or stdout */
          if (CPP_OPTION (pfile, in_fname) == NULL)
            CPP_OPTION (pfile, in_fname) = "";
          else if (CPP_OPTION (pfile, out_fname) == NULL)
            CPP_OPTION (pfile, out_fname) = "";
          break;
        case OPT_d:
          /* Args to -d specify what parts of macros to dump.
             Silently ignore unrecognised options; they may
             be aimed at the compiler proper. */
          {
            char c;

            while ((c = *arg++) != '\0')
              switch (c)
                {
                case 'M':
                  CPP_OPTION (pfile, dump_macros) = dump_only;
                  CPP_OPTION (pfile, no_output) = 1;
                  break;
                case 'N':
                  CPP_OPTION (pfile, dump_macros) = dump_names;
                  break;
                case 'D':
                  CPP_OPTION (pfile, dump_macros) = dump_definitions;
                  break;
                case 'I':
                  CPP_OPTION (pfile, dump_includes) = 1;
                  break;
                }
          }
          break;
          /* The style of the choices here is a bit mixed.
             The chosen scheme is a hybrid of keeping all options in one string
             and specifying each option in a separate argument:
             -M|-MM|-MD file|-MMD file [-MG].  An alternative is:
             -M|-MM|-MD file|-MMD file|-MG|-MMG; or more concisely:
             -M[M][G][D file].  This is awkward to handle in specs, and is not
             as extensible.  */
          /* ??? -MG must be specified in addition to one of -M or -MM.
             This can be relaxed in the future without breaking anything.
             The converse isn't true.  */

          /* -MG isn't valid with -MD or -MMD.  This is checked for later.  */
        case OPT_MG:
          CPP_OPTION (pfile, print_deps_missing_files) = 1;
          break;
        case OPT_M:
        case OPT_MD:
        case OPT_MM:
        case OPT_MMD:
          if (opt_code == OPT_M || opt_code == OPT_MD)
            CPP_OPTION (pfile, print_deps) = 2;
          else
            CPP_OPTION (pfile, print_deps) = 1;

          /* For -MD and -MMD options, write deps on file named by next arg */
          /* For -M and -MM, write deps on standard output
             and suppress the usual output.  */
          if (opt_code == OPT_MD || opt_code == OPT_MMD)
              CPP_OPTION (pfile, deps_file) = arg;
          else
              CPP_OPTION (pfile, no_output) = 1;
          break;
        case OPT_A:
          if (arg[0] == '-')
            {
              /* -A with an argument beginning with '-' acts as
                 #unassert on whatever immediately follows the '-'.
                 If "-" is the whole argument, we eliminate all
                 predefined macros and assertions, including those
                 that were specified earlier on the command line.
                 That way we can get rid of any that were passed
                 automatically in from GCC.  */

              if (arg[1] == '\0')
                {
                  struct pending_option *o1, *o2;

                  o1 = pend->directive_head;
                  while (o1)
                    {
                      o2 = o1->next;
                      free (o1);
                      o1 = o2;
                    }
                  pend->directive_head = NULL;
                  pend->directive_tail = NULL;
                }
              else
                new_pending_directive (pend, arg + 1, cpp_unassert);
            }
          else
            new_pending_directive (pend, arg, cpp_assert);
          break;
        case OPT_U:
          new_pending_directive (pend, arg, cpp_undef);
          break;
        case OPT_I:           /* Add directory to path for includes.  */
          if (!strcmp (arg, "-"))
            {
              /* -I- means:
                 Use the preceding -I directories for #include "..."
                 but not #include <...>.
                 Don't search the directory of the present file
                 for #include "...".  (Note that -I. -I- is not the same as
                 the default setup; -I. uses the compiler's working dir.)  */
              if (! CPP_OPTION (pfile, ignore_srcdir))
                {
                  pend->quote_head = pend->brack_head;
                  pend->quote_tail = pend->brack_tail;
                  pend->brack_head = 0;
                  pend->brack_tail = 0;
                  CPP_OPTION (pfile, ignore_srcdir) = 1;
                }
              else
                {
                  cpp_fatal (pfile, "-I- specified twice");
                  return argc;
                }
            }
          else
            append_include_chain (pfile, xstrdup (arg), BRACKET, 0);
          break;
        case OPT_isystem:
          /* Add directory to beginning of system include path, as a system
             include directory. */
          append_include_chain (pfile, xstrdup (arg), SYSTEM, 0);
          break;
        case OPT_include:
          {
            struct pending_option *o = (struct pending_option *)
              xmalloc (sizeof (struct pending_option));
            o->arg = arg;

            /* This list has to be built in reverse order so that
               when cpp_start_read pushes all the -include files onto
               the buffer stack, they will be scanned in forward order.  */
            o->next = pend->include_head;
            pend->include_head = o;
          }
          break;
        case OPT_imacros:
          {
            struct pending_option *o = (struct pending_option *)
              xmalloc (sizeof (struct pending_option));
            o->arg = arg;
            o->next = NULL;

            APPEND (pend, imacros, o);
          }
          break;
        case OPT_iwithprefix:
          /* Add directory to end of path for includes,
             with the default prefix at the front of its name.  */
          /* fall through */
        case OPT_iwithprefixbefore:
          /* Add directory to main path for includes,
             with the default prefix at the front of its name.  */
          {
            char *fname;
            int len;

            len = strlen (arg);

            if (CPP_OPTION (pfile, include_prefix) != 0)
              {
                size_t ipl = CPP_OPTION (pfile, include_prefix_len);
                fname = xmalloc (ipl + len + 1);
                memcpy (fname, CPP_OPTION (pfile, include_prefix), ipl);
                memcpy (fname + ipl, arg, len + 1);
              }
            else if (cpp_GCC_INCLUDE_DIR_len)
              {
                fname = xmalloc (cpp_GCC_INCLUDE_DIR_len + len + 1);
                memcpy (fname, cpp_GCC_INCLUDE_DIR, cpp_GCC_INCLUDE_DIR_len);
                memcpy (fname + cpp_GCC_INCLUDE_DIR_len, arg, len + 1);
              }
            else
              fname = xstrdup (arg);

            append_include_chain (pfile, fname,
                          opt_code == OPT_iwithprefix ? SYSTEM: BRACKET, 0);
          }
          break;
        case OPT_idirafter:
          /* Add directory to end of path for includes.  */
          append_include_chain (pfile, xstrdup (arg), AFTER, 0);
          break;
        case OPT_W:
          /* Silently ignore unrecognised options */
          if (!strcmp (argv[i], "-Wall"))
            {
              CPP_OPTION (pfile, warn_trigraphs) = 1;
              CPP_OPTION (pfile, warn_comments) = 1;
            }
          else if (!strcmp (argv[i], "-Wtraditional"))
            CPP_OPTION (pfile, warn_traditional) = 1;
          else if (!strcmp (argv[i], "-Wtrigraphs"))
            CPP_OPTION (pfile, warn_trigraphs) = 1;
          else if (!strcmp (argv[i], "-Wcomment"))
            CPP_OPTION (pfile, warn_comments) = 1;
          else if (!strcmp (argv[i], "-Wcomments"))
            CPP_OPTION (pfile, warn_comments) = 1;
          else if (!strcmp (argv[i], "-Wundef"))
            CPP_OPTION (pfile, warn_undef) = 1;
          else if (!strcmp (argv[i], "-Wimport"))
            CPP_OPTION (pfile, warn_import) = 1;
          else if (!strcmp (argv[i], "-Wpaste"))
            CPP_OPTION (pfile, warn_paste) = 1;
          else if (!strcmp (argv[i], "-Werror"))
            CPP_OPTION (pfile, warnings_are_errors) = 1;
          else if (!strcmp (argv[i], "-Wsystem-headers"))
            CPP_OPTION (pfile, warn_system_headers) = 1;
          else if (!strcmp (argv[i], "-Wno-traditional"))
            CPP_OPTION (pfile, warn_traditional) = 0;
          else if (!strcmp (argv[i], "-Wno-trigraphs"))
            CPP_OPTION (pfile, warn_trigraphs) = 0;
          else if (!strcmp (argv[i], "-Wno-comment"))
            CPP_OPTION (pfile, warn_comments) = 0;
          else if (!strcmp (argv[i], "-Wno-comments"))
            CPP_OPTION (pfile, warn_comments) = 0;
          else if (!strcmp (argv[i], "-Wno-undef"))
            CPP_OPTION (pfile, warn_undef) = 0;
          else if (!strcmp (argv[i], "-Wno-import"))
            CPP_OPTION (pfile, warn_import) = 0;
          else if (!strcmp (argv[i], "-Wno-paste"))
            CPP_OPTION (pfile, warn_paste) = 0;
          else if (!strcmp (argv[i], "-Wno-error"))
            CPP_OPTION (pfile, warnings_are_errors) = 0;
          else if (!strcmp (argv[i], "-Wno-system-headers"))
            CPP_OPTION (pfile, warn_system_headers) = 0;
          break;
        }
    }
  return i + 1;
}

#ifdef HOST_EBCDIC
static int
opt_comp (const void *p1, const void *p2)
{
  return strcmp (((struct cl_option *)p1)->opt_text,
                 ((struct cl_option *)p2)->opt_text);
}
#endif

/* Handle command-line options in (argc, argv).
   Can be called multiple times, to handle multiple sets of options.
   Returns if an unrecognized option is seen.
   Returns number of strings consumed.  */
int
cpp_handle_options (pfile, argc, argv)
     cpp_reader *pfile;
     int argc;
     char **argv;
{
  int i;
  int strings_processed;

  for (i = 0; i < argc; i += strings_processed)
    {
      strings_processed = cpp_handle_option (pfile, argc - i, argv + i);
      if (strings_processed == 0)
        break;
    }
  return i;
}

static void
print_help ()
{
  fprintf (stderr, _("Usage: %s [switches] input output\n"), progname);
  /* To keep the lines from getting too long for some compilers, limit
     to about 500 characters (6 lines) per chunk. */
  fputs (_("\
Switches:\n\
  -include <file>           Include the contents of <file> before other files\n\
  -imacros <file>           Accept definition of macros in <file>\n\
  -iprefix <path>           Specify <path> as a prefix for next two options\n\
  -iwithprefix <dir>        Add <dir> to the end of the system include path\n\
  -iwithprefixbefore <dir>  Add <dir> to the end of the main include path\n\
  -isystem <dir>            Add <dir> to the start of the system include path\n\
"), stdout);
  fputs (_("\
  -idirafter <dir>          Add <dir> to the end of the system include path\n\
  -I <dir>                  Add <dir> to the end of the main include path\n\
  -I-                       Fine-grained include path control; see info docs\n\
  -nostdinc                 Do not search system include directories\n\
                             (dirs specified with -isystem will still be used)\n\
  -nostdinc++               Do not search system include directories for C++\n\
  -o <file>                 Put output into <file>\n\
"), stdout);
  fputs (_("\
  -pedantic                 Issue all warnings demanded by strict ISO C\n\
  -pedantic-errors          Issue -pedantic warnings as errors instead\n\
  -trigraphs                Support ISO C trigraphs\n\
  -lang-c                   Assume that the input sources are in C\n\
  -lang-c89                 Assume that the input sources are in C89\n\
"), stdout);
  fputs (_("\
  -lang-c++                 Assume that the input sources are in C++\n\
  -lang-objc                Assume that the input sources are in ObjectiveC\n\
  -lang-objc++              Assume that the input sources are in ObjectiveC++\n\
  -lang-asm                 Assume that the input sources are in assembler\n\
"), stdout);
  fputs (_("\
  -std=<std name>           Specify the conformance standard; one of:\n\
                            gnu89, gnu99, c89, c99, iso9899:1990,\n\
                            iso9899:199409, iso9899:1999\n\
  -+                        Allow parsing of C++ style features\n\
  -w                        Inhibit warning messages\n\
  -Wtrigraphs               Warn if trigraphs are encountered\n\
  -Wno-trigraphs            Do not warn about trigraphs\n\
  -Wcomment{s}              Warn if one comment starts inside another\n\
"), stdout);
  fputs (_("\
  -Wno-comment{s}           Do not warn about comments\n\
  -Wtraditional             Warn about features not present in traditional C\n\
  -Wno-traditional          Do not warn about traditional C\n\
  -Wundef                   Warn if an undefined macro is used by #if\n\
  -Wno-undef                Do not warn about testing undefined macros\n\
  -Wimport                  Warn about the use of the #import directive\n\
"), stdout);
  fputs (_("\
  -Wno-import               Do not warn about the use of #import\n\
  -Werror                   Treat all warnings as errors\n\
  -Wno-error                Do not treat warnings as errors\n\
  -Wsystem-headers          Do not suppress warnings from system headers\n\
  -Wno-system-headers       Suppress warnings from system headers\n\
  -Wall                     Enable all preprocessor warnings\n\
"), stdout);
  fputs (_("\
  -M                        Generate make dependencies\n\
  -MM                       As -M, but ignore system header files\n\
  -MD                       As -M, but put output in a .d file\n\
  -MMD                      As -MD, but ignore system header files\n\
  -MG                       Treat missing header file as generated files\n\
  -g3                       Include #define and #undef directives in the output\n\
"), stdout);
  fputs (_("\
  -D<macro>                 Define a <macro> with string '1' as its value\n\
  -D<macro>=<val>           Define a <macro> with <val> as its value\n\
  -A<question> (<answer>)   Assert the <answer> to <question>\n\
  -A-<question> (<answer>)  Disable the <answer> to <question>\n\
  -U<macro>                 Undefine <macro> \n\
  -v                        Display the version number\n\
"), stdout);
  fputs (_("\
  -H                        Print the name of header files as they are used\n\
  -C                        Do not discard comments\n\
  -dM                       Display a list of macro definitions active at end\n\
  -dD                       Preserve macro definitions in output\n\
  -dN                       As -dD except that only the names are preserved\n\
  -dI                       Include #include directives in the output\n\
"), stdout);
  fputs (_("\
  -ftabstop=<number>        Distance between tab stops for column reporting\n\
  -P                        Do not generate #line directives\n\
  -$                        Do not allow '$' in identifiers\n\
  -remap                    Remap file names when including files.\n\
  --version                 Display version information\n\
  -h or --help              Display this information\n\
"), stdout);
}