* arm.c (arm_split_constant): Don't try to force a constant to

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

/* CPP Library.
   Copyright (C) 1986, 87, 89, 92-98, 1999 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"

#define FAKE_CONST
#include "cpplib.h"
#include "cpphash.h"
#include "output.h"
#include "prefix.h"
#include "intl.h"

/* XXX Should be in a header file. */
extern char *version_string;

/* 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

/* By default, colon separates directories in a path.  */
#ifndef PATH_SEPARATOR
#define PATH_SEPARATOR ':'
#endif

#ifndef STANDARD_INCLUDE_DIR
#define STANDARD_INCLUDE_DIR "/usr/include"
#endif

/* Symbols to predefine.  */

#ifdef CPP_PREDEFINES
static char *predefs = CPP_PREDEFINES;
#else
static char *predefs = "";
#endif

/* We let tm.h override the types used here, to handle trivial differences
   such as the choice of unsigned int or long unsigned int for size_t.
   When machines start needing nontrivial differences in the size type,
   it would be best to do something here to figure out automatically
   from other information what type to use.  */

/* The string value for __SIZE_TYPE__.  */

#ifndef SIZE_TYPE
#define SIZE_TYPE "long unsigned int"
#endif

/* The string value for __PTRDIFF_TYPE__.  */

#ifndef PTRDIFF_TYPE
#define PTRDIFF_TYPE "long int"
#endif

/* The string value for __WCHAR_TYPE__.  */

#ifndef WCHAR_TYPE
#define WCHAR_TYPE "int"
#endif
#define CPP_WCHAR_TYPE(PFILE) \
        (CPP_OPTIONS (PFILE)->cplusplus ? "__wchar_t" : WCHAR_TYPE)

/* The string value for __USER_LABEL_PREFIX__ */

#ifndef USER_LABEL_PREFIX
#define USER_LABEL_PREFIX ""
#endif

/* The string value for __REGISTER_PREFIX__ */

#ifndef REGISTER_PREFIX
#define REGISTER_PREFIX ""
#endif

/* #include "file" looks in source file dir, then stack.  */
/* #include <file> just looks in the stack.  */
/* -I directories are added to the end, then the defaults are added.  */
/* The */
static struct default_include {
  char *fname;                  /* The name of the directory.  */
  char *component;              /* The component containing the directory */
  int cplusplus;                /* Only look here if we're compiling C++.  */
  int cxx_aware;                /* Includes in this directory don't need to
                                   be wrapped in extern "C" when compiling
                                   C++.  */
} include_defaults_array[]
#ifdef INCLUDE_DEFAULTS
  = INCLUDE_DEFAULTS;
#else
  = {
    /* Pick up GNU C++ specific include files.  */
    { GPLUSPLUS_INCLUDE_DIR, "G++", 1, 1 },
#ifdef CROSS_COMPILE
    /* This is the dir for fixincludes.  Put it just before
       the files that we fix.  */
    { GCC_INCLUDE_DIR, "GCC", 0, 0 },
    /* For cross-compilation, this dir name is generated
       automatically in Makefile.in.  */
    { CROSS_INCLUDE_DIR, "GCC",0, 0 },
#ifdef TOOL_INCLUDE_DIR
    /* This is another place that the target system's headers might be.  */
    { TOOL_INCLUDE_DIR, "BINUTILS", 0, 1 },
#endif
#else /* not CROSS_COMPILE */
#ifdef LOCAL_INCLUDE_DIR
    /* This should be /usr/local/include and should come before
       the fixincludes-fixed header files.  */
    { LOCAL_INCLUDE_DIR, 0, 0, 1 },
#endif
#ifdef TOOL_INCLUDE_DIR
    /* This is here ahead of GCC_INCLUDE_DIR because assert.h goes here.
       Likewise, behind LOCAL_INCLUDE_DIR, where glibc puts its assert.h.  */
    { TOOL_INCLUDE_DIR, "BINUTILS", 0, 1 },
#endif
    /* This is the dir for fixincludes.  Put it just before
       the files that we fix.  */
    { GCC_INCLUDE_DIR, "GCC", 0, 0 },
    /* Some systems have an extra dir of include files.  */
#ifdef SYSTEM_INCLUDE_DIR
    { SYSTEM_INCLUDE_DIR, 0, 0, 0 },
#endif
#ifndef STANDARD_INCLUDE_COMPONENT
#define STANDARD_INCLUDE_COMPONENT 0
#endif
    { STANDARD_INCLUDE_DIR, STANDARD_INCLUDE_COMPONENT, 0, 0 },
#endif /* not CROSS_COMPILE */
    { 0, 0, 0, 0 }
    };
#endif /* no INCLUDE_DEFAULTS */

/* Internal structures and prototypes. */

struct cpp_pending
{
  struct cpp_pending *next;
  char *cmd;
  char *arg;
};
static struct cpp_pending *nreverse_pending PARAMS ((struct cpp_pending *));

static void initialize_char_syntax      PARAMS ((int));
static void print_help                  PARAMS ((void));
static void path_include                PARAMS ((cpp_reader *, char *));
static void initialize_builtins         PARAMS ((cpp_reader *));


/* If gcc is in use (stage2/stage3) we can make these tables initialized
   data. */
#if defined __GNUC__ && __GNUC__ >= 2
/* Table to tell if a character is legal as the second or later character
   of a C identifier. */
U_CHAR is_idchar[256] =
{
  ['a'] = 1, ['b'] = 1, ['c'] = 1,  ['d'] = 1, ['e'] = 1, ['f'] = 1,
  ['g'] = 1, ['h'] = 1, ['i'] = 1,  ['j'] = 1, ['k'] = 1, ['l'] = 1,
  ['m'] = 1, ['n'] = 1, ['o'] = 1,  ['p'] = 1, ['q'] = 1, ['r'] = 1,
  ['s'] = 1, ['t'] = 1, ['u'] = 1,  ['v'] = 1, ['w'] = 1, ['x'] = 1,
  ['y'] = 1, ['z'] = 1,

  ['A'] = 1, ['B'] = 1, ['C'] = 1,  ['D'] = 1, ['E'] = 1, ['F'] = 1,
  ['G'] = 1, ['H'] = 1, ['I'] = 1,  ['J'] = 1, ['K'] = 1, ['L'] = 1,
  ['M'] = 1, ['N'] = 1, ['O'] = 1,  ['P'] = 1, ['Q'] = 1, ['R'] = 1,
  ['S'] = 1, ['T'] = 1, ['U'] = 1,  ['V'] = 1, ['W'] = 1, ['X'] = 1,
  ['Y'] = 1, ['Z'] = 1,

  ['1'] = 1, ['2'] = 1, ['3'] = 1,  ['4'] = 1, ['5'] = 1, ['6'] = 1,
  ['7'] = 1, ['8'] = 1, ['9'] = 1,  ['0'] = 1,

  ['_']  = 1,
};

/* Table to tell if a character is legal as the first character of
   a C identifier. */
U_CHAR is_idstart[256] =
{
  ['a'] = 1, ['b'] = 1, ['c'] = 1,  ['d'] = 1, ['e'] = 1, ['f'] = 1,
  ['g'] = 1, ['h'] = 1, ['i'] = 1,  ['j'] = 1, ['k'] = 1, ['l'] = 1,
  ['m'] = 1, ['n'] = 1, ['o'] = 1,  ['p'] = 1, ['q'] = 1, ['r'] = 1,
  ['s'] = 1, ['t'] = 1, ['u'] = 1,  ['v'] = 1, ['w'] = 1, ['x'] = 1,
  ['y'] = 1, ['z'] = 1,

  ['A'] = 1, ['B'] = 1, ['C'] = 1,  ['D'] = 1, ['E'] = 1, ['F'] = 1,
  ['G'] = 1, ['H'] = 1, ['I'] = 1,  ['J'] = 1, ['K'] = 1, ['L'] = 1,
  ['M'] = 1, ['N'] = 1, ['O'] = 1,  ['P'] = 1, ['Q'] = 1, ['R'] = 1,
  ['S'] = 1, ['T'] = 1, ['U'] = 1,  ['V'] = 1, ['W'] = 1, ['X'] = 1,
  ['Y'] = 1, ['Z'] = 1,

  ['_']  = 1,
};

/* Table to tell if a character is horizontal space. */
U_CHAR is_hor_space[256] =
{
  [' '] = 1, ['\t'] = 1, ['\v'] = 1, ['\f'] = 1, ['\r'] = 1
};
/* table to tell if a character is horizontal or vertical space.  */
U_CHAR is_space[256] =
{
  [' '] = 1, ['\t'] = 1, ['\v'] = 1, ['\f'] = 1, ['\r'] = 1, ['\n'] = 1,
};
/* Table to handle trigraph conversion, which occurs before all other
   processing, everywhere in the file.  (This is necessary since one
   of the trigraphs encodes backslash.)  Note it's off by default.

        from    to      from    to      from    to
        ?? =    #       ?? )    ]       ?? !    |
        ?? (    [       ?? '    ^       ?? >    }
        ?? /    \       ?? <    {       ?? -    ~

   There is not a space between the ?? and the third char.  I put spaces
   there to avoid warnings when compiling this file. */
U_CHAR trigraph_table[256] =
{
  ['='] = '#',  [')'] = ']',  ['!'] = '|',
  ['('] = '[',  ['\''] = '^', ['>'] = '}',
  ['/'] = '\\', ['<'] = '{',  ['-'] = '~',
};

/* This function will be entirely removed soon. */
static inline void
initialize_char_syntax (dollar_in_ident)
     int dollar_in_ident;
{
  is_idchar['$'] = dollar_in_ident;
  is_idstart['$'] = dollar_in_ident;
}

#else /* Not GCC. */

U_CHAR is_idchar[256] = { 0 };
U_CHAR is_idstart[256] = { 0 };
U_CHAR is_hor_space[256] = { 0 };
U_CHAR is_space[256] = { 0 };
U_CHAR trigraph_table[256] = { 0 };

/* Initialize syntactic classifications of characters. */
static void
initialize_char_syntax (dollar_in_ident)
     int dollar_in_ident;
{
  is_idstart['a'] = 1; is_idstart['b'] = 1; is_idstart['c'] = 1;
  is_idstart['d'] = 1; is_idstart['e'] = 1; is_idstart['f'] = 1;
  is_idstart['g'] = 1; is_idstart['h'] = 1; is_idstart['i'] = 1;
  is_idstart['j'] = 1; is_idstart['k'] = 1; is_idstart['l'] = 1;
  is_idstart['m'] = 1; is_idstart['n'] = 1; is_idstart['o'] = 1;
  is_idstart['p'] = 1; is_idstart['q'] = 1; is_idstart['r'] = 1;
  is_idstart['s'] = 1; is_idstart['t'] = 1; is_idstart['u'] = 1;
  is_idstart['v'] = 1; is_idstart['w'] = 1; is_idstart['x'] = 1;
  is_idstart['y'] = 1; is_idstart['z'] = 1;

  is_idstart['A'] = 1; is_idstart['B'] = 1; is_idstart['C'] = 1;
  is_idstart['D'] = 1; is_idstart['E'] = 1; is_idstart['F'] = 1;
  is_idstart['G'] = 1; is_idstart['H'] = 1; is_idstart['I'] = 1;
  is_idstart['J'] = 1; is_idstart['K'] = 1; is_idstart['L'] = 1;
  is_idstart['M'] = 1; is_idstart['N'] = 1; is_idstart['O'] = 1;
  is_idstart['P'] = 1; is_idstart['Q'] = 1; is_idstart['R'] = 1;
  is_idstart['S'] = 1; is_idstart['T'] = 1; is_idstart['U'] = 1;
  is_idstart['V'] = 1; is_idstart['W'] = 1; is_idstart['X'] = 1;
  is_idstart['Y'] = 1; is_idstart['Z'] = 1;

  is_idstart['_'] = 1;

  is_idchar['a'] = 1; is_idchar['b'] = 1; is_idchar['c'] = 1;
  is_idchar['d'] = 1; is_idchar['e'] = 1; is_idchar['f'] = 1;
  is_idchar['g'] = 1; is_idchar['h'] = 1; is_idchar['i'] = 1;
  is_idchar['j'] = 1; is_idchar['k'] = 1; is_idchar['l'] = 1;
  is_idchar['m'] = 1; is_idchar['n'] = 1; is_idchar['o'] = 1;
  is_idchar['p'] = 1;  is_idchar['q'] = 1; is_idchar['r'] = 1;
  is_idchar['s'] = 1; is_idchar['t'] = 1;  is_idchar['u'] = 1;
  is_idchar['v'] = 1; is_idchar['w'] = 1; is_idchar['x'] = 1;
  is_idchar['y'] = 1; is_idchar['z'] = 1;

  is_idchar['A'] = 1; is_idchar['B'] = 1; is_idchar['C'] = 1;
  is_idchar['D'] = 1; is_idchar['E'] = 1; is_idchar['F'] = 1;
  is_idchar['G'] = 1; is_idchar['H'] = 1; is_idchar['I'] = 1;
  is_idchar['J'] = 1; is_idchar['K'] = 1; is_idchar['L'] = 1;
  is_idchar['M'] = 1; is_idchar['N'] = 1; is_idchar['O'] = 1;
  is_idchar['P'] = 1; is_idchar['Q'] = 1; is_idchar['R'] = 1;
  is_idchar['S'] = 1; is_idchar['T'] = 1;  is_idchar['U'] = 1;
  is_idchar['V'] = 1; is_idchar['W'] = 1; is_idchar['X'] = 1;
  is_idchar['Y'] = 1; is_idchar['Z'] = 1;

  is_idchar['1'] = 1; is_idchar['2'] = 1; is_idchar['3'] = 1;
  is_idchar['4'] = 1; is_idchar['5'] = 1; is_idchar['6'] = 1;
  is_idchar['7'] = 1; is_idchar['8'] = 1; is_idchar['9'] = 1;
  is_idchar['0'] = 1;

  is_idchar['_']  = 1;

  is_idchar['$']  = dollar_in_ident;
  is_idstart['$'] = dollar_in_ident;

  /* white space tables */
  is_hor_space[' '] = 1;
  is_hor_space['\t'] = 1;
  is_hor_space['\v'] = 1;
  is_hor_space['\f'] = 1;
  is_hor_space['\r'] = 1;

  is_space[' '] = 1;
  is_space['\t'] = 1;
  is_space['\v'] = 1;
  is_space['\f'] = 1;
  is_space['\n'] = 1;
  is_space['\r'] = 1;

  /* trigraph conversion */
  trigraph_table['='] = '#';  trigraph_table[')'] = ']';
  trigraph_table['!'] = '|';  trigraph_table['('] = '[';
  trigraph_table['\''] = '^'; trigraph_table['>'] = '}';
  trigraph_table['/'] = '\\'; trigraph_table['<'] = '{';
  trigraph_table['-'] = '~';
}

#endif /* Not GCC. */

/* 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, path)
     cpp_reader *pfile;
     char *path;
{
  char *p;

  p = path;

  if (*p)
    while (1) {
      char *q = p;
      char *name;

      /* Find the end of this name.  */
      while (*q != 0 && *q != PATH_SEPARATOR) q++;
      if (p == q) {
        /* 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);
        bcopy (p, name, q - p);
        name[q - p] = 0;
      }

      append_include_chain (pfile,
                            &(CPP_OPTIONS (pfile)->bracket_include), name, 0);

      /* Advance past this name.  */
      p = q;
      if (*p == 0)
        break;
      /* Skip the colon.  */
      p++;
    }
}

/* Write out a #define command for the special named MACRO_NAME
   to PFILE's token_buffer.  */

static void
dump_special_to_buffer (pfile, macro_name)
     cpp_reader *pfile;
     char *macro_name;
{
  static char define_directive[] = "#define ";
  int macro_name_length = strlen (macro_name);
  output_line_command (pfile, 0, same_file);
  CPP_RESERVE (pfile, sizeof(define_directive) + macro_name_length);
  CPP_PUTS_Q (pfile, define_directive, sizeof(define_directive)-1);
  CPP_PUTS_Q (pfile, macro_name, macro_name_length);
  CPP_PUTC_Q (pfile, ' ');
  cpp_expand_to_buffer (pfile, macro_name, macro_name_length);
  CPP_PUTC (pfile, '\n');
}

/* Pending-list utility routines.  Will go away soon.  */
static struct cpp_pending *
nreverse_pending (list)
     struct cpp_pending *list;
     
{
  register struct cpp_pending *prev = 0, *next, *pend;
  for (pend = list;  pend;  pend = next)
    {
      next = pend->next;
      pend->next = prev;
      prev = pend;
    }
  return prev;
}

static void
push_pending (pfile, cmd, arg)
     cpp_reader *pfile;
     char *cmd;
     char *arg;
{
  struct cpp_pending *pend
    = (struct cpp_pending *) xmalloc (sizeof (struct cpp_pending));
  pend->cmd = cmd;
  pend->arg = arg;
  pend->next = CPP_OPTIONS (pfile)->pending;
  CPP_OPTIONS (pfile)->pending = pend;
}


/* Initialize a cpp_options structure. */
void
cpp_options_init (opts)
     cpp_options *opts;
{
  bzero ((char *) opts, sizeof *opts);

  opts->dollars_in_ident = 1;
  opts->cplusplus_comments = 1;
  opts->warn_import = 1;
}

/* Initialize a cpp_reader structure. */
void
cpp_reader_init (pfile)
     cpp_reader *pfile;
{
  bzero ((char *) pfile, sizeof (cpp_reader));
#if 0
  pfile->get_token = cpp_get_token;
#endif

  pfile->token_buffer_size = 200;
  pfile->token_buffer = (U_CHAR *) xmalloc (pfile->token_buffer_size);
  CPP_SET_WRITTEN (pfile, 0);

  pfile->hashtab = (HASHNODE **) xcalloc (HASHSIZE, sizeof (HASHNODE *));
}

/* Free resources used by PFILE.
   This is the cpp_reader 'finalizer' or 'destructor' (in C++ terminology).  */
void
cpp_cleanup (pfile)
     cpp_reader *pfile;
{
  int i;
  while (CPP_BUFFER (pfile) != CPP_NULL_BUFFER (pfile))
    cpp_pop_buffer (pfile);

  if (pfile->token_buffer)
    {
      free (pfile->token_buffer);
      pfile->token_buffer = NULL;
    }

  if (pfile->deps_buffer)
    {
      free (pfile->deps_buffer);
      pfile->deps_buffer = NULL;
      pfile->deps_allocated_size = 0;
    }

  while (pfile->if_stack)
    {
      IF_STACK_FRAME *temp = pfile->if_stack;
      pfile->if_stack = temp->next;
      free (temp);
    }

  for (i = ALL_INCLUDE_HASHSIZE; --i >= 0; )
    {
      struct include_hash *imp = pfile->all_include_files[i];
      while (imp)
        {
          struct include_hash *next = imp->next;
#if 0
          /* This gets freed elsewhere - I think. */
          free (imp->name);
#endif
          free (imp);
          imp = next;
        }
      pfile->all_include_files[i] = 0;
    }

  for (i = HASHSIZE; --i >= 0;)
    {
      while (pfile->hashtab[i])
        delete_macro (pfile->hashtab[i]);
    }
  free (pfile->hashtab);
}


/* Initialize the built-in macros.  */
static void
initialize_builtins (pfile)
     cpp_reader *pfile;
{
#define NAME(str) (U_CHAR *)str, sizeof str - 1
  cpp_install (pfile, NAME("__TIME__"),           T_TIME,       0, -1);
  cpp_install (pfile, NAME("__DATE__"),           T_DATE,       0, -1);
  cpp_install (pfile, NAME("__FILE__"),           T_FILE,       0, -1);
  cpp_install (pfile, NAME("__BASE_FILE__"),      T_BASE_FILE,  0, -1);
  cpp_install (pfile, NAME("__LINE__"),           T_SPECLINE,   0, -1);
  cpp_install (pfile, NAME("__INCLUDE_LEVEL__"),  T_INCLUDE_LEVEL, 0, -1);
  cpp_install (pfile, NAME("__VERSION__"),        T_VERSION,    0, -1);
#ifndef NO_BUILTIN_SIZE_TYPE
  cpp_install (pfile, NAME("__SIZE_TYPE__"),      T_CONST, SIZE_TYPE, -1);
#endif
#ifndef NO_BUILTIN_PTRDIFF_TYPE
  cpp_install (pfile, NAME("__PTRDIFF_TYPE__ "),  T_CONST, PTRDIFF_TYPE, -1);
#endif
  cpp_install (pfile, NAME("__WCHAR_TYPE__"),     T_CONST, WCHAR_TYPE, -1);
  cpp_install (pfile, NAME("__USER_LABEL_PREFIX__"), T_CONST, user_label_prefix, -1);
  cpp_install (pfile, NAME("__REGISTER_PREFIX__"),  T_CONST, REGISTER_PREFIX, -1);
  if (!CPP_TRADITIONAL (pfile))
    {
      cpp_install (pfile, NAME("__STDC__"),       T_STDC,  0, -1);
#if 0
      if (CPP_OPTIONS (pfile)->c9x)
        cpp_install (pfile, NAME("__STDC_VERSION__"),T_CONST, "199909L", -1);
      else
#endif
        cpp_install (pfile, NAME("__STDC_VERSION__"),T_CONST, "199409L", -1);
    }
#undef NAME

  if (CPP_OPTIONS (pfile)->debug_output)
    {
      dump_special_to_buffer (pfile, "__BASE_FILE__");
      dump_special_to_buffer (pfile, "__VERSION__");
#ifndef NO_BUILTIN_SIZE_TYPE
      dump_special_to_buffer (pfile, "__SIZE_TYPE__");
#endif
#ifndef NO_BUILTIN_PTRDIFF_TYPE
      dump_special_to_buffer (pfile, "__PTRDIFF_TYPE__");
#endif
      dump_special_to_buffer (pfile, "__WCHAR_TYPE__");
      dump_special_to_buffer (pfile, "__DATE__");
      dump_special_to_buffer (pfile, "__TIME__");
      if (!CPP_TRADITIONAL (pfile))
        dump_special_to_buffer (pfile, "__STDC__");
    }
}

/* 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, fname)
     cpp_reader *pfile;
     char *fname;
{
  struct cpp_options *opts = CPP_OPTIONS (pfile);
  struct cpp_pending *pend;
  char *p;
  int f;
  cpp_buffer *fp;
  struct include_hash *ih_fake;

  /* The code looks at the defaults through this pointer, rather than
     through the constant structure above.  This pointer gets changed
     if an environment variable specifies other defaults.  */
  struct default_include *include_defaults = include_defaults_array;

  /* Now that we know dollars_in_ident, we can initialize the syntax
     tables. */
  initialize_char_syntax (opts->dollars_in_ident);
  
  /* Add dirs from CPATH after dirs from -I.  */
  /* There seems to be confusion about what CPATH should do,
     so for the moment it is not documented.  */
  /* Some people say that CPATH should replace the standard include
     dirs, but that seems pointless: it comes before them, so it
     overrides them anyway.  */
  GET_ENV_PATH_LIST (p, "CPATH");
  if (p != 0 && ! opts->no_standard_includes)
    path_include (pfile, p);

  /* Do partial setup of input buffer for the sake of generating
     early #line directives (when -g is in effect).  */
  fp = cpp_push_buffer (pfile, NULL, 0);
  if (!fp)
    return 0;
  if (opts->in_fname == NULL || *opts->in_fname == 0)
    {
      opts->in_fname = fname;
      if (opts->in_fname == NULL)
        opts->in_fname = "";
    }
  fp->nominal_fname = fp->fname = opts->in_fname;
  fp->lineno = 0;

  /* Install __LINE__, etc.  Must follow initialize_char_syntax
     and option processing.  */
  initialize_builtins (pfile);

  /* Do standard #defines and assertions
     that identify system and machine type.  */

  if (!opts->inhibit_predefs) {
    char *p = (char *) alloca (strlen (predefs) + 1);
    strcpy (p, predefs);
    while (*p) {
      char *q;
      while (*p == ' ' || *p == '\t')
        p++;
      /* Handle -D options.  */ 
      if (p[0] == '-' && p[1] == 'D') {
        q = &p[2];
        while (*p && *p != ' ' && *p != '\t')
          p++;
        if (*p != 0)
          *p++= 0;
        if (opts->debug_output)
          output_line_command (pfile, 0, same_file);
        cpp_define (pfile, q);
        while (*p == ' ' || *p == '\t')
          p++;
      } else if (p[0] == '-' && p[1] == 'A') {
        /* Handle -A options (assertions).  */ 
        char *assertion;
        char *past_name;
        char *value;
        char *past_value;
        char *termination;
        int save_char;

        assertion = &p[2];
        past_name = assertion;
        /* Locate end of name.  */
        while (*past_name && *past_name != ' '
               && *past_name != '\t' && *past_name != '(')
          past_name++;
        /* Locate `(' at start of value.  */
        value = past_name;
        while (*value && (*value == ' ' || *value == '\t'))
          value++;
        if (*value++ != '(')
          abort ();
        while (*value && (*value == ' ' || *value == '\t'))
          value++;
        past_value = value;
        /* Locate end of value.  */
        while (*past_value && *past_value != ' '
               && *past_value != '\t' && *past_value != ')')
          past_value++;
        termination = past_value;
        while (*termination && (*termination == ' ' || *termination == '\t'))
          termination++;
        if (*termination++ != ')')
          abort ();
        if (*termination && *termination != ' ' && *termination != '\t')
          abort ();
        /* Temporarily null-terminate the value.  */
        save_char = *termination;
        *termination = '\0';
        /* Install the assertion.  */
        cpp_assert (pfile, assertion);
        *termination = (char) save_char;
        p = termination;
        while (*p == ' ' || *p == '\t')
          p++;
      } else {
        abort ();
      }
    }
  }

  /* Now handle the command line options.  */

  /* Do -U's, -D's and -A's in the order they were seen.  */
  /* First reverse the list.  */
  opts->pending = nreverse_pending (opts->pending);

  for (pend = opts->pending;  pend;  pend = pend->next)
    {
      if (pend->cmd != NULL && pend->cmd[0] == '-')
        {
          switch (pend->cmd[1])
            {
            case 'U':
              if (opts->debug_output)
                output_line_command (pfile, 0, same_file);
              cpp_undef (pfile, pend->arg);
              break;
            case 'D':
              if (opts->debug_output)
                output_line_command (pfile, 0, same_file);
              cpp_define (pfile, pend->arg);
              break;
            case 'A':
              cpp_assert (pfile, pend->arg);
              break;
            }
        }
    }

  opts->done_initializing = 1;

  { /* Read the appropriate environment variable and if it exists
       replace include_defaults with the listed path.  */
    char *epath = 0;
    switch ((opts->objc << 1) + opts->cplusplus)
      {
      case 0:
        GET_ENV_PATH_LIST (epath, "C_INCLUDE_PATH");
        break;
      case 1:
        GET_ENV_PATH_LIST (epath, "CPLUS_INCLUDE_PATH");
        break;
      case 2:
        GET_ENV_PATH_LIST (epath, "OBJC_INCLUDE_PATH");
        break;
      case 3:
        GET_ENV_PATH_LIST (epath, "OBJCPLUS_INCLUDE_PATH");
        break;
      }
    /* If the environment var for this language is set,
       add to the default list of include directories.  */
    if (epath) {
      char *nstore = (char *) alloca (strlen (epath) + 2);
      int num_dirs;
      char *startp, *endp;

      for (num_dirs = 1, startp = epath; *startp; startp++)
        if (*startp == PATH_SEPARATOR)
          num_dirs++;
      include_defaults
        = (struct default_include *) xmalloc ((num_dirs
                                               * sizeof (struct default_include))
                                              + sizeof (include_defaults_array));
      startp = endp = epath;
      num_dirs = 0;
      while (1) {
        /* Handle cases like c:/usr/lib:d:/gcc/lib */
        if ((*endp == PATH_SEPARATOR)
            || *endp == 0) {
          strncpy (nstore, startp, endp-startp);
          if (endp == startp)
            strcpy (nstore, ".");
          else
            nstore[endp-startp] = '\0';

          include_defaults[num_dirs].fname = xstrdup (nstore);
          include_defaults[num_dirs].component = 0;
          include_defaults[num_dirs].cplusplus = opts->cplusplus;
          include_defaults[num_dirs].cxx_aware = 1;
          num_dirs++;
          if (*endp == '\0')
            break;
          endp = startp = endp + 1;
        } else
          endp++;
      }
      /* Put the usual defaults back in at the end.  */
      bcopy ((char *) include_defaults_array,
             (char *) &include_defaults[num_dirs],
             sizeof (include_defaults_array));
    }
  }

  /* Unless -fnostdinc,
     tack on the standard include file dirs to the specified list */
  if (!opts->no_standard_includes) {
    struct default_include *p = include_defaults;
    char *specd_prefix = opts->include_prefix;
    char *default_prefix = xstrdup (GCC_INCLUDE_DIR);
    int default_len = 0;
    /* Remove the `include' from /usr/local/lib/gcc.../include.  */
    if (!strcmp (default_prefix + strlen (default_prefix) - 8, "/include")) {
      default_len = strlen (default_prefix) - 7;
      default_prefix[default_len] = 0;
    }
    /* Search "translated" versions of GNU directories.
       These have /usr/local/lib/gcc... replaced by specd_prefix.  */
    if (specd_prefix != 0 && default_len != 0)
      for (p = include_defaults; p->fname; p++) {
        /* Some standard dirs are only for C++.  */
        if (!p->cplusplus
            || (opts->cplusplus && !opts->no_standard_cplusplus_includes)) {
          /* Does this dir start with the prefix?  */
          if (!strncmp (p->fname, default_prefix, default_len)) {
            /* Yes; change prefix and add to search list.  */
            int this_len = strlen (specd_prefix)
                           + strlen (p->fname) - default_len;
            char *str = (char *) xmalloc (this_len + 1);
            strcpy (str, specd_prefix);
            strcat (str, p->fname + default_len);

            append_include_chain (pfile, &opts->system_include,
                                  str, !p->cxx_aware);
          }
        }
      }
    /* Search ordinary names for GNU include directories.  */
    for (p = include_defaults; p->fname; p++) {
      /* Some standard dirs are only for C++.  */
      if (!p->cplusplus
          || (opts->cplusplus && !opts->no_standard_cplusplus_includes)) {
        const char *str = update_path (p->fname, p->component);
        append_include_chain (pfile, &opts->system_include,
                              str, !p->cxx_aware);
      }
    }
  }

  merge_include_chains (opts);

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

  /* Copy the entire contents of the main input file into
     the stacked input buffer previously allocated for it.  */
  if (fname == NULL || *fname == 0) {
    fname = "";
    f = 0;
  } else if ((f = open (fname, O_RDONLY|O_NONBLOCK|O_NOCTTY, 0666)) < 0)
    cpp_pfatal_with_name (pfile, fname);

  /* -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 (opts->print_deps_missing_files
      && (opts->print_deps == 0 || !opts->no_output))
    {
      cpp_fatal (pfile, "-MG must be specified with one of -M or -MM");
      return 0;
    }

  /* 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 (opts->print_deps == 0
      && (getenv ("SUNPRO_DEPENDENCIES") != 0
          || getenv ("DEPENDENCIES_OUTPUT") != 0)) {
    char *spec = getenv ("DEPENDENCIES_OUTPUT");
    char *s;
    char *output_file;

    if (spec == 0)
      {
        spec = getenv ("SUNPRO_DEPENDENCIES");
        opts->print_deps = 2;
      }
    else
      opts->print_deps = 1;

    s = spec;
    /* Find the space before the DEPS_TARGET, if there is one.  */
    /* This should use index.  (mrs) */
    while (*s != 0 && *s != ' ') s++;
    if (*s != 0)
      {
        opts->deps_target = s + 1;
        output_file = (char *) xmalloc (s - spec + 1);
        bcopy (spec, output_file, s - spec);
        output_file[s - spec] = 0;
      }
    else
      {
        opts->deps_target = 0;
        output_file = spec;
      }

    opts->deps_file = output_file;
    opts->print_deps_append = 1;
  }

  /* For -M, print the expected object file name
     as the target of this Make-rule.  */
  if (opts->print_deps)
    {
      pfile->deps_allocated_size = 200;
      pfile->deps_buffer = (char *) xmalloc (pfile->deps_allocated_size);
      pfile->deps_buffer[0] = 0;
      pfile->deps_size = 0;
      pfile->deps_column = 0;

      if (opts->deps_target)
        deps_output (pfile, opts->deps_target, ':');
      else if (*opts->in_fname == 0)
        deps_output (pfile, "-", ':');
      else
        {
          char *p, *q, *r;
          int len, x;
          static char *known_suffixes[] = { ".c", ".C", ".s", ".S", ".m",
                                     ".cc", ".cxx", ".cpp", ".cp",
                                     ".c++", 0
                                   };

          /* Discard all directory prefixes from filename.  */
          if ((q = rindex (opts->in_fname, '/')) != NULL
#ifdef DIR_SEPARATOR
              && (q = rindex (opts->in_fname, DIR_SEPARATOR)) != NULL
#endif
              )
            ++q;
          else
            q = opts->in_fname;

          /* Copy remainder to mungable area.  */
          p = (char *) alloca (strlen(q) + 8);
          strcpy (p, q);

          /* Output P, but remove known suffixes.  */
          len = strlen (p);
          q = p + len;
          /* Point to the filename suffix.  */
          r = rindex (p, '.');
          /* Compare against the known suffixes.  */
          x = 0;
          while (known_suffixes[x] != 0)
            {
              if (strncmp (known_suffixes[x], r, q - r) == 0)
                {
                  /* Make q point to the bit we're going to overwrite
                     with an object suffix.  */
                  q = r;
                  break;
                }
              x++;
            }

          /* Supply our own suffix.  */
#ifndef VMS
          strcpy (q, ".o");
#else
          strcpy (q, ".obj");
#endif

          deps_output (pfile, p, ':');
          deps_output (pfile, opts->in_fname, ' ');
        }
    }

  /* Must call finclude() on the main input before processing
     -include switches; otherwise the -included text winds up
     after the main input. */
  ih_fake = (struct include_hash *) xmalloc (sizeof (struct include_hash));
  ih_fake->next = 0;
  ih_fake->next_this_file = 0;
  ih_fake->foundhere = ABSOLUTE_PATH;  /* well sort of ... */
  ih_fake->name = fname;
  ih_fake->control_macro = 0;
  ih_fake->buf = (char *)-1;
  ih_fake->limit = 0;
  if (!finclude (pfile, f, ih_fake))
    return 0;
  output_line_command (pfile, 0, same_file);
  pfile->only_seen_white = 2;

  /* 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.  That means the -include
     files have to be processed in reverse order of the pending list,
     which means the pending list has to be reversed again, which
     means the -imacros files have to be done separately and first. */
  
  pfile->no_record_file++;
  opts->no_output++;
  for (pend = opts->pending; pend; pend = pend->next)
    {
      if (pend->cmd != NULL)
        {
          if (strcmp (pend->cmd, "-imacros") == 0)
            {
              int fd = open (pend->arg, O_RDONLY|O_NONBLOCK|O_NOCTTY, 0666);
              if (fd < 0)
                {
                  cpp_perror_with_name (pfile, pend->arg);
                  return 0;
                }
              if (!cpp_push_buffer (pfile, NULL, 0))
                return 0;

              ih_fake = (struct include_hash *)
                  xmalloc (sizeof (struct include_hash));
              ih_fake->next = 0;
              ih_fake->next_this_file = 0;
              ih_fake->foundhere = ABSOLUTE_PATH;  /* well sort of ... */
              ih_fake->name = pend->arg;
              ih_fake->control_macro = 0;
              ih_fake->buf = (char *)-1;
              ih_fake->limit = 0;
              if (!finclude (pfile, fd, ih_fake))
                cpp_scan_buffer (pfile);
              free (ih_fake);
            }
        }
    }
  opts->no_output--;
  opts->pending = nreverse_pending (opts->pending);
  for (pend = opts->pending; pend; pend = pend->next)
    {
      if (pend->cmd != NULL)
        {
          if (strcmp (pend->cmd, "-include") == 0)
            {
              int fd = open (pend->arg, O_RDONLY|O_NONBLOCK|O_NOCTTY, 0666);
              if (fd < 0)
                {
                  cpp_perror_with_name (pfile, pend->arg);
                  return 0;
                }
              if (!cpp_push_buffer (pfile, NULL, 0))
                return 0;

              ih_fake = (struct include_hash *)
                  xmalloc (sizeof (struct include_hash));
              ih_fake->next = 0;
              ih_fake->next_this_file = 0;
              ih_fake->foundhere = ABSOLUTE_PATH;  /* well sort of ... */
              ih_fake->name = pend->arg;
              ih_fake->control_macro = 0;
              ih_fake->buf = (char *)-1;
              ih_fake->limit = 0;
              if (finclude (pfile, fd, ih_fake))
                output_line_command (pfile, 0, enter_file);
            }
        }
    }
  pfile->no_record_file--;

  /* Free the pending list.  */
  for (pend = opts->pending;  pend; )
    {
      struct cpp_pending *next = pend->next;
      free (pend);
      pend = next;
    }
  opts->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)
     cpp_reader *pfile;
{
  struct cpp_options *opts = CPP_OPTIONS (pfile);

  if (CPP_PREV_BUFFER (CPP_BUFFER (pfile)) != CPP_NULL_BUFFER (pfile))
    cpp_fatal (pfile,
               "cpplib internal error: buffers still stacked in cpp_finish");
  cpp_pop_buffer (pfile);
  
  if (opts->print_deps)
    {
      /* Stream on which to print the dependency information.  */
      FILE *deps_stream;

      /* Don't actually write the deps file if compilation has failed.  */
      if (pfile->errors == 0)
        {
          char *deps_mode = opts->print_deps_append ? "a" : "w";
          if (opts->deps_file == 0)
            deps_stream = stdout;
          else if ((deps_stream = fopen (opts->deps_file, deps_mode)) == 0)
            cpp_pfatal_with_name (pfile, opts->deps_file);
          fputs (pfile->deps_buffer, deps_stream);
          putc ('\n', deps_stream);
          if (opts->deps_file)
            {
              if (ferror (deps_stream) || fclose (deps_stream) != 0)
                cpp_fatal (pfile, "I/O error on output");
            }
        }
    }
}

/* 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;
{
  struct cpp_options *opts = CPP_OPTIONS (pfile);
  int i = 0;

  if (user_label_prefix == NULL)
    user_label_prefix = USER_LABEL_PREFIX;

  if (argv[i][0] != '-') {
    if (opts->out_fname != NULL)
      {
        print_help ();
        cpp_fatal (pfile, "Too many arguments");
      }
    else if (opts->in_fname != NULL)
      opts->out_fname = argv[i];
    else
      opts->in_fname = argv[i];
  } else {
    switch (argv[i][1]) {
      
    missing_filename:
      cpp_fatal (pfile, "Filename missing after `%s' option", argv[i]);
      return argc;
    missing_dirname:
      cpp_fatal (pfile, "Directory name missing after `%s' option", argv[i]);
      return argc;
      
    case 'f':
      if (!strcmp (argv[i], "-fleading-underscore"))
        user_label_prefix = "_";
      else if (!strcmp (argv[i], "-fno-leading-underscore"))
        user_label_prefix = "";
      break;

    case 'I':                   /* Add directory to path for includes.  */
      if (!strcmp (argv[i] + 2, "-"))
        {
          if (! opts->ignore_srcdir)
            {
              opts->ignore_srcdir = 1;
              /* Don't use any preceding -I directories for #include <...>. */
              opts->quote_include = opts->bracket_include;
              opts->bracket_include = 0;
            }
        }
      else
        {
          char *fname;
          if (argv[i][2] != 0)
            fname = argv[i] + 2;
          else if (i + 1 == argc)
            goto missing_dirname;
          else
            fname = argv[++i];
          append_include_chain (pfile, &opts->bracket_include, fname, 0);
        }
      break;

    case 'i':
      /* Add directory to beginning of system include path, as a system
         include directory. */
      if (!strcmp (argv[i], "-isystem"))
        {
          if (i + 1 == argc)
            goto missing_filename;
          append_include_chain (pfile, &opts->system_include, argv[++i], 1);
        }
      /* Add directory to end of path for includes,
         with the default prefix at the front of its name.  */
      else if (!strcmp (argv[i], "-iwithprefix"))
        {
          char *fname;
          if (i + 1 == argc)
            goto missing_dirname;
          ++i;

          if (opts->include_prefix != 0)
            {
              fname = xmalloc (strlen (opts->include_prefix)
                               + strlen (argv[i]) + 1);
              strcpy (fname, opts->include_prefix);
              strcat (fname, argv[i]);
            }
          else
            {
              fname = xmalloc (strlen (GCC_INCLUDE_DIR)
                               + strlen (argv[i]) + 1);
              strcpy (fname, GCC_INCLUDE_DIR);
              /* Remove the `include' from /usr/local/lib/gcc.../include.  */
              if (!strcmp (fname + strlen (fname) - 8, "/include"))
                fname[strlen (fname) - 7] = 0;
              strcat (fname, argv[i]);
            }
          
          append_include_chain (pfile, &opts->system_include, fname, 0);
      }
      /* Add directory to main path for includes,
         with the default prefix at the front of its name.  */
      else if (!strcmp (argv[i], "-iwithprefix"))
        {
          char *fname;
          if (i + 1 == argc)
            goto missing_dirname;
          ++i;

          if (opts->include_prefix != 0)
            {
              fname = xmalloc (strlen (opts->include_prefix)
                               + strlen (argv[i]) + 1);
              strcpy (fname, opts->include_prefix);
              strcat (fname, argv[i]);
            }
          else
            {
              fname = xmalloc (strlen (GCC_INCLUDE_DIR)
                               + strlen (argv[i]) + 1);
              strcpy (fname, GCC_INCLUDE_DIR);
              /* Remove the `include' from /usr/local/lib/gcc.../include.  */
              if (!strcmp (fname + strlen (fname) - 8, "/include"))
                fname[strlen (fname) - 7] = 0;
              strcat (fname, argv[i]);
            }
          
          append_include_chain (pfile, &opts->bracket_include, fname, 0);
        }
      /* Add directory to end of path for includes.  */
      else if (!strcmp (argv[i], "-idirafter"))
        {
          if (i + 1 == argc)
            goto missing_dirname;
          append_include_chain (pfile, &opts->after_include, argv[++i], 0);
        }
      else if (!strcmp (argv[i], "-include") || !strcmp (argv[i], "-imacros"))
        {
          if (i + 1 == argc)
            goto missing_filename;
          else
            push_pending (pfile, argv[i], argv[i+1]), i++;
        }
      else if (!strcmp (argv[i], "-iprefix"))
        {
          if (i + 1 == argc)
            goto missing_filename;
          else
              opts->include_prefix = argv[++i];
        }
      else if (!strcmp (argv[i], "-ifoutput"))
        opts->output_conditionals = 1;

      break;
      
    case 'o':
      if (opts->out_fname != NULL)
        {
          cpp_fatal (pfile, "Output filename specified twice");
          return argc;
        }
      if (i + 1 == argc)
        goto missing_filename;
      opts->out_fname = argv[++i];
      if (!strcmp (opts->out_fname, "-"))
        opts->out_fname = "";
      break;
      
    case 'p':
      if (!strcmp (argv[i], "-pedantic"))
        CPP_PEDANTIC (pfile) = 1;
      else if (!strcmp (argv[i], "-pedantic-errors")) {
        CPP_PEDANTIC (pfile) = 1;
        opts->pedantic_errors = 1;
      }
#if 0
      else if (!strcmp (argv[i], "-pcp")) {
        char *pcp_fname = argv[++i];
        pcp_outfile = ((pcp_fname[0] != '-' || pcp_fname[1] != '\0')
                       ? fopen (pcp_fname, "w")
                       : fdopen (dup (fileno (stdout)), "w"));
        if (pcp_outfile == 0)
          cpp_pfatal_with_name (pfile, pcp_fname);
        no_precomp = 1;
      }
#endif
      break;
      
    case 't':
      if (!strcmp (argv[i], "-traditional")) {
        opts->traditional = 1;
        opts->cplusplus_comments = 0;
      } else if (!strcmp (argv[i], "-trigraphs")) {
        if (!opts->chill)
          opts->trigraphs = 1;
      }
      break;
      
    case 'l':
      if (! strcmp (argv[i], "-lang-c"))
        opts->cplusplus = 0, opts->cplusplus_comments = 1, opts->c89 = 0,
          opts->c9x = 1, opts->objc = 0;
      if (! strcmp (argv[i], "-lang-c89"))
        opts->cplusplus = 0, opts->cplusplus_comments = 0, opts->c89 = 1,
          opts->c9x = 0, opts->objc = 0;
      if (! strcmp (argv[i], "-lang-c++"))
        opts->cplusplus = 1, opts->cplusplus_comments = 1, opts->c89 = 0,
          opts->c9x = 0, opts->objc = 0;
      if (! strcmp (argv[i], "-lang-objc"))
        opts->cplusplus = 0, opts->cplusplus_comments = 1, opts->c89 = 0,
          opts->c9x = 0, opts->objc = 1;
      if (! strcmp (argv[i], "-lang-objc++"))
        opts->cplusplus = 1, opts->cplusplus_comments = 1, opts->c89 = 0,
          opts->c9x = 0, opts->objc = 1;
      if (! strcmp (argv[i], "-lang-asm"))
        opts->lang_asm = 1;
      if (! strcmp (argv[i], "-lint"))
        opts->for_lint = 1;
      if (! strcmp (argv[i], "-lang-chill"))
        opts->objc = 0, opts->cplusplus = 0, opts->chill = 1,
          opts->traditional = 1, opts->trigraphs = 0;
      break;
      
    case '+':
      opts->cplusplus = 1, opts->cplusplus_comments = 1;
      break;

    case 's':
      if (!strcmp (argv[i], "-std=iso9899:1990")
          || !strcmp (argv[i], "-std=iso9899:199409")
          || !strcmp (argv[i], "-std=c89")
          || !strcmp (argv[i], "-std=gnu89"))
          opts->cplusplus = 0, opts->cplusplus_comments = 0,
            opts->c89 = 1, opts->c9x = 0, opts->objc = 0;
      else if (!strcmp (argv[i], "-std=iso9899:199x")
               || !strcmp (argv[i], "-std=c9x")
               || !strcmp (argv[i], "-std=gnu9x"))
        opts->cplusplus = 0, opts->cplusplus_comments = 1, opts->c89 = 0,
          opts->c9x = 1, opts->objc = 0;
      break;

    case 'w':
      opts->inhibit_warnings = 1;
      break;
      
    case 'W':
      if (!strcmp (argv[i], "-Wtrigraphs"))
        opts->warn_trigraphs = 1;
      else if (!strcmp (argv[i], "-Wno-trigraphs"))
        opts->warn_trigraphs = 0;
      else if (!strcmp (argv[i], "-Wcomment"))
        opts->warn_comments = 1;
      else if (!strcmp (argv[i], "-Wno-comment"))
        opts->warn_comments = 0;
      else if (!strcmp (argv[i], "-Wcomments"))
        opts->warn_comments = 1;
      else if (!strcmp (argv[i], "-Wno-comments"))
        opts->warn_comments = 0;
      else if (!strcmp (argv[i], "-Wtraditional"))
        opts->warn_stringify = 1;
      else if (!strcmp (argv[i], "-Wno-traditional"))
        opts->warn_stringify = 0;
      else if (!strcmp (argv[i], "-Wundef"))
        opts->warn_undef = 1;
      else if (!strcmp (argv[i], "-Wno-undef"))
        opts->warn_undef = 0;
      else if (!strcmp (argv[i], "-Wimport"))
        opts->warn_import = 1;
      else if (!strcmp (argv[i], "-Wno-import"))
        opts->warn_import = 0;
      else if (!strcmp (argv[i], "-Werror"))
        opts->warnings_are_errors = 1;
      else if (!strcmp (argv[i], "-Wno-error"))
        opts->warnings_are_errors = 0;
      else if (!strcmp (argv[i], "-Wall"))
        {
          opts->warn_trigraphs = 1;
          opts->warn_comments = 1;
        }
      break;
      
    case 'M':
      /* 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.  */
      if (!strcmp (argv[i], "-MG"))
        {
          opts->print_deps_missing_files = 1;
          break;
        }
      if (!strcmp (argv[i], "-M"))
        opts->print_deps = 2;
      else if (!strcmp (argv[i], "-MM"))
        opts->print_deps = 1;
      else if (!strcmp (argv[i], "-MD"))
        opts->print_deps = 2;
      else if (!strcmp (argv[i], "-MMD"))
        opts->print_deps = 1;
      /* For -MD and -MMD options, write deps on file named by next arg.  */
      if (!strcmp (argv[i], "-MD") || !strcmp (argv[i], "-MMD"))
        {
          if (i+1 == argc)
            goto missing_filename;
          opts->deps_file = argv[++i];
        }
      else
        {
          /* For -M and -MM, write deps on standard output
             and suppress the usual output.  */
          opts->no_output = 1;
        }         
      break;
      
    case 'd':
      {
        char *p = argv[i] + 2;
        char c;
        while ((c = *p++) != 0) {
          /* Arg to -d specifies what parts of macros to dump */
          switch (c) {
          case 'M':
            opts->dump_macros = dump_only;
            opts->no_output = 1;
            break;
          case 'N':
            opts->dump_macros = dump_names;
            break;
          case 'D':
            opts->dump_macros = dump_definitions;
            break;
          case 'I':
            opts->dump_includes = 1;
            break;
          }
        }
      }
    break;
    
    case 'g':
      if (argv[i][2] == '3')
        opts->debug_output = 1;
      break;
      
    case '-':
      if (strcmp (argv[i], "--help") != 0)
        return i;
      print_help ();
      break;
        
    case 'v':
      cpp_notice ("GNU CPP version %s", version_string);
#ifdef TARGET_VERSION
      TARGET_VERSION;
#endif
      fprintf (stderr, "\n");
      opts->verbose = 1;
      break;
      
    case 'H':
      opts->print_include_names = 1;
      break;
      
    case 'D':
      if (argv[i][2] != 0)
        push_pending (pfile, "-D", argv[i] + 2);
      else if (i + 1 == argc)
        {
          cpp_fatal (pfile, "Macro name missing after -D option");
          return argc;
        }
      else
        i++, push_pending (pfile, "-D", argv[i]);
      break;
      
    case 'A':
      {
        char *p;
        
        if (argv[i][2] != 0)
          p = argv[i] + 2;
        else if (i + 1 == argc)
          {
            cpp_fatal (pfile, "Assertion missing after -A option");
            return argc;
          }
        else
          p = argv[++i];
        
        if (!strcmp (p, "-")) {
          struct cpp_pending **ptr;
          /* -A- eliminates all predefined macros and assertions.
             Let's include also any that were specified earlier
             on the command line.  That way we can get rid of any
             that were passed automatically in from GCC.  */
          opts->inhibit_predefs = 1;
          for (ptr = &opts->pending; *ptr != NULL; )
            {
              struct cpp_pending *pend = *ptr;
              if (pend->cmd && pend->cmd[0] == '-'
                  && (pend->cmd[1] == 'D' || pend->cmd[1] == 'A'))
                {
                  *ptr = pend->next;
                  free (pend);
                }
              else
                ptr = &pend->next;
            }
        } else {
          push_pending (pfile, "-A", p);
        }
      }
    break;
    
    case 'U':           /* JF #undef something */
      if (argv[i][2] != 0)
        push_pending (pfile, "-U", argv[i] + 2);
      else if (i + 1 == argc)
        {
          cpp_fatal (pfile, "Macro name missing after -U option");
          return argc;
        }
      else
        push_pending (pfile, "-U", argv[i+1]), i++;
      break;
      
    case 'C':
      opts->put_out_comments = 1;
      break;
      
    case 'E':                   /* -E comes from cc -E; ignore it.  */
      break;
      
    case 'P':
      opts->no_line_commands = 1;
      break;
      
    case '$':                   /* Don't include $ in identifiers.  */
      opts->dollars_in_ident = 0;
      break;
      
    case 'n':
      if (!strcmp (argv[i], "-nostdinc"))
        /* -nostdinc causes no default include directories.
           You must specify all include-file directories with -I.  */
        opts->no_standard_includes = 1;
      else if (!strcmp (argv[i], "-nostdinc++"))
        /* -nostdinc++ causes no default C++-specific include directories. */
        opts->no_standard_cplusplus_includes = 1;
#if 0
      else if (!strcmp (argv[i], "-noprecomp"))
        no_precomp = 1;
#endif
      break;
      
    case 'r':
      if (!strcmp (argv[i], "-remap"))
        opts->remap = 1;
      break;
      
    case 'u':
      /* Sun compiler passes undocumented switch "-undef".
         Let's assume it means to inhibit the predefined symbols.  */
      opts->inhibit_predefs = 1;
      break;
      
    case '\0': /* JF handle '-' as file name meaning stdin or stdout */
      if (opts->in_fname == NULL) {
        opts->in_fname = "";
        break;
      } else if (opts->out_fname == NULL) {
        opts->out_fname = "";
        break;
      } /* else fall through into error */

    default:
      return i;
    }
  }

  return i + 1;
}

/* 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 ()
{
  cpp_notice ("Usage: %s [switches] input output\n", progname);
  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\
  -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\
  -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\
  -pedantic                 Issue all warnings demanded by strict ANSI C\n\
  -traditional              Follow K&R pre-processor behaviour\n\
  -trigraphs                Support ANSI 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\
  -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\
  -lang-chill               Assume that the input sources are in Chill\n\
  -std=<std name>           Specify the conformance standard; one of:\n\
                            gnu89, gnu9x, c89, c9x, iso9899:1990,\n\
                            iso9899:199409, iso9899:199x\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\
  -Wno-comment{s}           Do not warn about comments\n\
  -Wtraditional             Warn if a macro argument is/would be turned into\n\
                             a string if -traditional is specified\n\
  -Wno-traditional          Do not warn about stringification\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\
  -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\
  -Wall                     Enable all preprocessor warnings\n\
  -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\
  -g                        Include #define and #undef directives in the output\n\
  -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\
  -U<macro>                 Undefine <macro> \n\
  -u or -undef              Do not predefine any macros\n\
  -v                        Display the version number\n\
  -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\
  -ifoutput                 Describe skipped code blocks in output \n\
  -P                        Do not generate #line directives\n\
  -$                        Do not allow '$' in identifiers\n\
  -remap                    Remap file names when including files.\n\
  -h or --help              Display this information\n\
"), stdout);
}