Merge in gcc2 snapshot 19980929. See gcc/ChangeLog and gcc/FSFChangeLog for

[thirdparty/gcc.git] / gcc / collect2.c

/* Collect static initialization info into data structures that can be
   traversed by C++ initialization and finalization routines.
   Copyright (C) 1992, 93-98, 1999 Free Software Foundation, Inc.
   Contributed by Chris Smith (csmith@convex.com).
   Heavily modified by Michael Meissner (meissner@cygnus.com),
   Per Bothner (bothner@cygnus.com), and John Gilmore (gnu@cygnus.com).

This file is part of GNU CC.

GNU CC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

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

You should have received a copy of the GNU General Public License
along with GNU CC; see the file COPYING.  If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */


/* Build tables of static constructors and destructors and run ld.  */

#include "config.h"
#include "system.h"
#include <signal.h>

#ifdef vfork /* Autoconf may define this to fork for us. */
# define VFORK_STRING "fork"
#else
# define VFORK_STRING "vfork"
#endif
#ifdef HAVE_VFORK_H
#include <vfork.h>
#endif
#ifdef VMS
#define vfork() (decc$$alloc_vfork_blocks() >= 0 ? \
               lib$get_current_invo_context(decc$$get_vfork_jmpbuf()) : -1)
#endif /* VMS */

#define COLLECT

#include "collect2.h"
#include "demangle.h"
#include "obstack.h"
#include "intl.h"
#ifdef __CYGWIN__
#include <process.h>
#endif

/* Obstack allocation and deallocation routines.  */
#define obstack_chunk_alloc xmalloc
#define obstack_chunk_free free

extern char *make_temp_file PROTO ((char *));
\f
/* On certain systems, we have code that works by scanning the object file
   directly.  But this code uses system-specific header files and library
   functions, so turn it off in a cross-compiler.  Likewise, the names of
   the utilities are not correct for a cross-compiler; we have to hope that
   cross-versions are in the proper directories.  */

#ifdef CROSS_COMPILE
#undef SUNOS4_SHARED_LIBRARIES
#undef OBJECT_FORMAT_COFF
#undef OBJECT_FORMAT_ROSE
#undef MD_EXEC_PREFIX
#undef REAL_LD_FILE_NAME
#undef REAL_NM_FILE_NAME
#undef REAL_STRIP_FILE_NAME
#endif

/* If we cannot use a special method, use the ordinary one:
   run nm to find what symbols are present.
   In a cross-compiler, this means you need a cross nm,
   but that is not quite as unpleasant as special headers.  */

#if !defined (OBJECT_FORMAT_COFF) && !defined (OBJECT_FORMAT_ROSE)
#define OBJECT_FORMAT_NONE
#endif

#ifdef OBJECT_FORMAT_COFF

#include <a.out.h>
#include <ar.h>

#ifdef UMAX
#include <sgs.h>
#endif

/* Many versions of ldfcn.h define these.  */
#ifdef FREAD
#undef FREAD
#undef FWRITE
#endif

#include <ldfcn.h>

/* Some systems have an ISCOFF macro, but others do not.  In some cases
   the macro may be wrong.  MY_ISCOFF is defined in tm.h files for machines
   that either do not have an ISCOFF macro in /usr/include or for those 
   where it is wrong.  */

#ifndef MY_ISCOFF
#define MY_ISCOFF(X) ISCOFF (X)
#endif

#endif /* OBJECT_FORMAT_COFF */

#ifdef OBJECT_FORMAT_ROSE

#ifdef _OSF_SOURCE
#define USE_MMAP
#endif

#ifdef USE_MMAP
#include <sys/mman.h>
#endif

#include <unistd.h>
#include <mach_o_format.h>
#include <mach_o_header.h>
#include <mach_o_vals.h>
#include <mach_o_types.h>

#endif /* OBJECT_FORMAT_ROSE */

#ifdef OBJECT_FORMAT_NONE

/* Default flags to pass to nm.  */
#ifndef NM_FLAGS
#define NM_FLAGS "-n"
#endif

#endif /* OBJECT_FORMAT_NONE */

/* Some systems use __main in a way incompatible with its use in gcc, in these
   cases use the macros NAME__MAIN to give a quoted symbol and SYMBOL__MAIN to
   give the same symbol without quotes for an alternative entry point.  You
   must define both, or neither.  */
#ifndef NAME__MAIN
#define NAME__MAIN "__main"
#define SYMBOL__MAIN __main
#endif

/* This must match tree.h.  */
#define DEFAULT_INIT_PRIORITY 65535

#if defined (LDD_SUFFIX) || SUNOS4_SHARED_LIBRARIES
#define SCAN_LIBRARIES
#endif

#ifdef USE_COLLECT2
int do_collecting = 1;
#else
int do_collecting = 0;
#endif
\f
/* Linked lists of constructor and destructor names.  */

struct id 
{
  struct id *next;
  int sequence;
  char name[1];
};

struct head
{
  struct id *first;
  struct id *last;
  int number;
};

/* Enumeration giving which pass this is for scanning the program file.  */

enum pass {
  PASS_FIRST,                           /* without constructors */
  PASS_OBJ,                             /* individual objects */
  PASS_LIB,                             /* looking for shared libraries */
  PASS_SECOND                           /* with constructors linked in */
};

extern char *version_string;

int vflag;                              /* true if -v */
static int rflag;                       /* true if -r */
static int strip_flag;                  /* true if -s */
#ifdef COLLECT_EXPORT_LIST
static int export_flag;                 /* true if -bE */
static int aix64_flag;                  /* true if -b64 */
#endif

int debug;                              /* true if -debug */

static int shared_obj;                  /* true if -shared */

static char *c_file;                    /* <xxx>.c for constructor/destructor list.  */
static char *o_file;                    /* <xxx>.o for constructor/destructor list.  */
#ifdef COLLECT_EXPORT_LIST
static char *export_file;               /* <xxx>.x for AIX export list.  */
static char *import_file;               /* <xxx>.p for AIX import list.  */
#endif
char *ldout;                            /* File for ld errors.  */
static char *output_file;               /* Output file for ld.  */
static char *nm_file_name;              /* pathname of nm */
#ifdef LDD_SUFFIX
static char *ldd_file_name;             /* pathname of ldd (or equivalent) */
#endif
static char *strip_file_name;           /* pathname of strip */
char *c_file_name;                      /* pathname of gcc */
static char *initname, *fininame;       /* names of init and fini funcs */

static struct head constructors;        /* list of constructors found */
static struct head destructors;         /* list of destructors found */
#ifdef COLLECT_EXPORT_LIST
static struct head exports;             /* list of exported symbols */
static struct head imports;             /* list of imported symbols */
static struct head undefined;           /* list of undefined symbols */
#endif
static struct head frame_tables;        /* list of frame unwind info tables */

struct obstack temporary_obstack;
struct obstack permanent_obstack;
char * temporary_firstobj;

/* Defined in the automatically-generated underscore.c.  */
extern int prepends_underscore;

extern FILE *fdopen ();

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

/* Structure to hold all the directories in which to search for files to
   execute.  */

struct prefix_list
{
  char *prefix;               /* String to prepend to the path.  */
  struct prefix_list *next;   /* Next in linked list.  */
};

struct path_prefix
{
  struct prefix_list *plist;  /* List of prefixes to try */
  int max_len;                /* Max length of a prefix in PLIST */
  char *name;                 /* Name of this list (used in config stuff) */
};

#ifdef COLLECT_EXPORT_LIST
/* Lists to keep libraries to be scanned for global constructors/destructors. */
static struct head libs;                    /* list of libraries */
static struct path_prefix cmdline_lib_dirs; /* directories specified with -L */
static struct path_prefix libpath_lib_dirs; /* directories in LIBPATH */
static struct path_prefix *libpaths[3] = {&cmdline_lib_dirs,
                                          &libpath_lib_dirs, NULL};
static char *libexts[3] = {"a", "so", NULL};  /* possible library extentions */
#endif

void error              PVPROTO((const char *, ...)) ATTRIBUTE_PRINTF_1;
void fatal              PVPROTO((const char *, ...)) 
  ATTRIBUTE_PRINTF_1 ATTRIBUTE_NORETURN;
void fatal_perror       PVPROTO((const char *, ...))
  ATTRIBUTE_PRINTF_1 ATTRIBUTE_NORETURN;
static char *my_strerror        PROTO((int));
static const char *my_strsignal PROTO((int));
static void handler             PROTO((int));
static int is_ctor_dtor         PROTO((char *));
static char *find_a_file        PROTO((struct path_prefix *, char *));
static void add_prefix          PROTO((struct path_prefix *, char *));
static void prefix_from_env     PROTO((char *, struct path_prefix *));
static void prefix_from_string  PROTO((char *, struct path_prefix *));
static void do_wait             PROTO((char *));
static void fork_execute        PROTO((char *, char **));
static void maybe_unlink        PROTO((char *));
static void add_to_list         PROTO((struct head *, char *));
static int  extract_init_priority PROTO((char *));
static void sort_ids            PROTO((struct head *));
static void write_list          PROTO((FILE *, char *, struct id *));
#ifdef COLLECT_EXPORT_LIST
static void dump_list           PROTO((FILE *, char *, struct id *));
#endif
#if 0
static void dump_prefix_list    PROTO((FILE *, char *, struct prefix_list *));
#endif
static void write_list_with_asm PROTO((FILE *, char *, struct id *));
static void write_c_file        PROTO((FILE *, char *));
static void scan_prog_file      PROTO((char *, enum pass));
#ifdef SCAN_LIBRARIES
static void scan_libraries      PROTO((char *));
#endif
#ifdef COLLECT_EXPORT_LIST
static int is_in_list           PROTO((char *, struct id *));
static void write_export_file   PROTO((FILE *));
static void write_import_file   PROTO((FILE *));
static char *resolve_lib_name   PROTO((char *));
static int use_import_list      PROTO((char *));
static int ignore_library       PROTO((char *));
#endif
\f
#ifdef NO_DUP2
int
dup2 (oldfd, newfd)
     int oldfd;
     int newfd;
{
  int fdtmp[256];
  int fdx = 0;
  int fd;
 
  if (oldfd == newfd)
    return oldfd;
  close (newfd);
  while ((fd = dup (oldfd)) != newfd && fd >= 0) /* good enough for low fd's */
    fdtmp[fdx++] = fd;
  while (fdx > 0)
    close (fdtmp[--fdx]);

  return fd;
}
#endif

static char *
my_strerror (e)
     int e;
{

#ifdef HAVE_STRERROR
  return strerror (e);

#else

  if (!e)
    return "";

  if (e > 0 && e < sys_nerr)
    return sys_errlist[e];

  return "errno = ?";
#endif
}

static const char *
my_strsignal (s)
     int s;
{
#ifdef HAVE_STRSIGNAL
  return strsignal (s);
#else
  if (s >= 0 && s < NSIG)
    {
# ifdef NO_SYS_SIGLIST
      static char buffer[30];

      sprintf (buffer, "Unknown signal %d", s);
      return buffer;
# else
      return sys_siglist[s];
# endif
    }
  else
    return NULL;
#endif /* HAVE_STRSIGNAL */
}
\f
/* Delete tempfiles and exit function.  */

void
collect_exit (status)
     int status;
{
  if (c_file != 0 && c_file[0])
    maybe_unlink (c_file);

  if (o_file != 0 && o_file[0])
    maybe_unlink (o_file);

#ifdef COLLECT_EXPORT_LIST
  if (export_file != 0 && export_file[0])
    maybe_unlink (export_file);

  if (import_file != 0 && import_file[0])
    maybe_unlink (import_file);
#endif

  if (ldout != 0 && ldout[0])
    {
      dump_file (ldout);
      maybe_unlink (ldout);
    }

  if (status != 0 && output_file != 0 && output_file[0])
    maybe_unlink (output_file);

  exit (status);
}

\f
/* Notify user of a non-error.  */
void
notice VPROTO((char *msgid, ...))
{
#ifndef __STDC__
  char *msgid;
#endif
  va_list ap;

  VA_START (ap, msgid);

#ifndef __STDC__
  msgid = va_arg (ap, char *);
#endif

  vfprintf (stderr, _(msgid), ap);
  va_end (ap);
}

/* Die when sys call fails.  */

void
fatal_perror VPROTO((const char * msgid, ...))
{
#ifndef ANSI_PROTOTYPES
  const char *msgid;
#endif
  int e = errno;
  va_list ap;

  VA_START (ap, msgid);

#ifndef ANSI_PROTOTYPES
  msgid = va_arg (ap, const char *);
#endif

  fprintf (stderr, "collect2: ");
  vfprintf (stderr, _(msgid), ap);
  fprintf (stderr, ": %s\n", my_strerror (e));
  va_end (ap);

  collect_exit (FATAL_EXIT_CODE);
}

/* Just die.  */

void
fatal VPROTO((const char * msgid, ...))
{
#ifndef ANSI_PROTOTYPES
  const char *msgid;
#endif
  va_list ap;
  
  VA_START (ap, msgid);

#ifndef ANSI_PROTOTYPES
  msgid = va_arg (ap, const char *);
#endif
  
  fprintf (stderr, "collect2: ");
  vfprintf (stderr, _(msgid), ap);
  fprintf (stderr, "\n");
  va_end (ap);

  collect_exit (FATAL_EXIT_CODE);
}

/* Write error message.  */

void
error VPROTO((const char * msgid, ...))
{
#ifndef ANSI_PROTOTYPES
  const char * string;
#endif
  va_list ap;
 
  VA_START (ap, msgid);
  
#ifndef ANSI_PROTOTYPES
  msgid = va_arg (ap, const char *);
#endif

  fprintf (stderr, "collect2: ");
  vfprintf (stderr, _(msgid), ap);
  fprintf (stderr, "\n");
  va_end(ap);
}

/* In case obstack is linked in, and abort is defined to fancy_abort,
   provide a default entry.  */

void
fancy_abort ()
{
  fatal ("internal error");
}
\f
static void
handler (signo)
     int signo;
{
  if (c_file != 0 && c_file[0])
    maybe_unlink (c_file);

  if (o_file != 0 && o_file[0])
    maybe_unlink (o_file);

  if (ldout != 0 && ldout[0])
    maybe_unlink (ldout);

#ifdef COLLECT_EXPORT_LIST
  if (export_file != 0 && export_file[0])
    maybe_unlink (export_file);

  if (import_file != 0 && import_file[0])
    maybe_unlink (import_file);
#endif

  signal (signo, SIG_DFL);
  kill (getpid (), signo);
}

\f
PTR
xcalloc (size1, size2)
  size_t size1, size2;
{
  PTR ptr = (PTR) calloc (size1, size2);
  if (!ptr)
    fatal ("out of memory");
  return ptr;
}

PTR
xmalloc (size)
  size_t size;
{
  PTR ptr = (PTR) malloc (size);
  if (!ptr)
    fatal ("out of memory");
  return ptr;
}

PTR
xrealloc (old, size)
  PTR old;
  size_t size;
{
  register PTR ptr;
  if (ptr)
    ptr = (PTR) realloc (old, size);
  else
    ptr = (PTR) malloc (size);
  if (ptr == 0)
    fatal ("virtual memory exhausted");
  return ptr;
}

int
file_exists (name)
     char *name;
{
  return access (name, R_OK) == 0;
}

/* Make a copy of a string INPUT with size SIZE.  */

char *
xstrdup (input)
  const char *input;
{
  register size_t len = strlen (input) + 1;
  register char *output = xmalloc (len);
  memcpy (output, input, len);
  return output;
}

/* Parse a reasonable subset of shell quoting syntax.  */

static char *
extract_string (pp)
     char **pp;
{
  char *p = *pp;
  int backquote = 0;
  int inside = 0;

  for (;;)
    {
      char c = *p;
      if (c == '\0')
        break;
      ++p;
      if (backquote)
        obstack_1grow (&temporary_obstack, c);
      else if (! inside && c == ' ')
        break;
      else if (! inside && c == '\\')
        backquote = 1;
      else if (c == '\'')
        inside = !inside;
      else
        obstack_1grow (&temporary_obstack, c);
    }

  obstack_1grow (&temporary_obstack, '\0');
  *pp = p;
  return obstack_finish (&temporary_obstack);
}
\f
void
dump_file (name)
     char *name;
{
  FILE *stream = fopen (name, "r");
  int no_demangle = !! getenv ("COLLECT_NO_DEMANGLE");

  if (stream == 0)
    return;
  while (1)
    {
      int c;
      while (c = getc (stream),
             c != EOF && (ISALNUM (c) || c == '_' || c == '$' || c == '.'))
        obstack_1grow (&temporary_obstack, c);
      if (obstack_object_size (&temporary_obstack) > 0)
        {
          char *word, *p, *result;
          obstack_1grow (&temporary_obstack, '\0');
          word = obstack_finish (&temporary_obstack);

          if (*word == '.')
            ++word, putc ('.', stderr);
          p = word;
          if (*p == '_' && prepends_underscore)
            ++p;

          if (no_demangle)
            result = 0;
          else
            result = cplus_demangle (p, DMGL_PARAMS | DMGL_ANSI);

          if (result)
            {
              int diff;
              fputs (result, stderr);

              diff = strlen (word) - strlen (result);
              while (diff > 0)
                --diff, putc (' ', stderr);
              while (diff < 0 && c == ' ')
                ++diff, c = getc (stream);

              free (result);
            }
          else
            fputs (word, stderr);

          fflush (stderr);
          obstack_free (&temporary_obstack, temporary_firstobj);
        }
      if (c == EOF)
        break;
      putc (c, stderr);
    }
  fclose (stream);
}
\f
/* Decide whether the given symbol is:
   a constructor (1), a destructor (2), or neither (0).  */

static int
is_ctor_dtor (s)
     char *s;
{
  struct names { char *name; int len; int ret; int two_underscores; };

  register struct names *p;
  register int ch;
  register char *orig_s = s;

  static struct names special[] = {
#ifdef NO_DOLLAR_IN_LABEL
#ifdef NO_DOT_IN_LABEL
    { "GLOBAL__I_", sizeof ("GLOBAL__I_")-1, 1, 0 },
    { "GLOBAL__D_", sizeof ("GLOBAL__D_")-1, 2, 0 },
    { "GLOBAL__F_", sizeof ("GLOBAL__F_")-1, 5, 0 },
#else
    { "GLOBAL_.I.", sizeof ("GLOBAL_.I.")-1, 1, 0 },
    { "GLOBAL_.D.", sizeof ("GLOBAL_.D.")-1, 2, 0 },
    { "GLOBAL_.F.", sizeof ("GLOBAL_.F.")-1, 5, 0 },
#endif
#else
    { "GLOBAL_$I$", sizeof ("GLOBAL_$I$")-1, 1, 0 },
    { "GLOBAL_$D$", sizeof ("GLOBAL_$D$")-1, 2, 0 },
    { "GLOBAL_$F$", sizeof ("GLOBAL_$F$")-1, 5, 0 },
#endif
    { "GLOBAL__FI_", sizeof ("GLOBAL__FI_")-1, 3, 0 },
    { "GLOBAL__FD_", sizeof ("GLOBAL__FD_")-1, 4, 0 },
#ifdef CFRONT_LOSSAGE /* Do not collect cfront initialization functions.
                         cfront has its own linker procedure to collect them;
                         if collect2 gets them too, they get collected twice
                         when the cfront procedure is run and the compiler used
                         for linking happens to be GCC.  */
    { "sti__", sizeof ("sti__")-1, 1, 1 },
    { "std__", sizeof ("std__")-1, 2, 1 },
#endif /* CFRONT_LOSSAGE */
    { NULL, 0, 0, 0 }
  };

  while ((ch = *s) == '_')
    ++s;

  if (s == orig_s)
    return 0;

  for (p = &special[0]; p->len > 0; p++)
    {
      if (ch == p->name[0]
          && (!p->two_underscores || ((s - orig_s) >= 2))
          && strncmp(s, p->name, p->len) == 0)
        {
          return p->ret;
        }
    }
  return 0;
}
\f
/* Routine to add variables to the environment.  */

#ifndef HAVE_PUTENV

int
putenv (str)
     char *str;
{
#ifndef VMS                     /* nor about VMS */

  extern char **environ;
  char **old_environ = environ;
  char **envp;
  int num_envs = 0;
  int name_len = 1;
  char *p = str;
  int ch;

  while ((ch = *p++) != '\0' && ch != '=')
    name_len++;

  if (!ch)
    abort ();

  /* Search for replacing an existing environment variable, and
     count the number of total environment variables.  */
  for (envp = old_environ; *envp; envp++)
    {
      num_envs++;
      if (!strncmp (str, *envp, name_len))
        {
          *envp = str;
          return 0;
        }
    }

  /* Add a new environment variable */
  environ = (char **) xmalloc (sizeof (char *) * (num_envs+2));
  *environ = str;
  bcopy ((char *) old_environ, (char *) (environ + 1),
         sizeof (char *) * (num_envs+1));

  return 0;
#endif  /* VMS */
}

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

/* We maintain two prefix lists: one from COMPILER_PATH environment variable
   and one from the PATH variable.  */

static struct path_prefix cpath, path;

#ifdef CROSS_COMPILE
/* This is the name of the target machine.  We use it to form the name
   of the files to execute.  */

static char *target_machine = TARGET_MACHINE;
#endif

/* Search for NAME using prefix list PPREFIX.  We only look for executable
   files. 

   Return 0 if not found, otherwise return its name, allocated with malloc.  */

static char *
find_a_file (pprefix, name)
     struct path_prefix *pprefix;
     char *name;
{
  char *temp;
  struct prefix_list *pl;
  int len = pprefix->max_len + strlen (name) + 1;

  if (debug)
    fprintf (stderr, "Looking for '%s'\n", name);
  
#ifdef EXECUTABLE_SUFFIX
  len += strlen (EXECUTABLE_SUFFIX);
#endif

  temp = xmalloc (len);

  /* Determine the filename to execute (special case for absolute paths).  */

  if (*name == '/'
#ifdef DIR_SEPARATOR
      || (DIR_SEPARATOR == '\\' && name[1] == ':'
      && (name[2] == DIR_SEPARATOR || name[2] == '/'))
#endif
      )
    {
      if (access (name, X_OK) == 0)
        {
          strcpy (temp, name);

          if (debug)
            fprintf (stderr, "  - found: absolute path\n");
          
          return temp;
        }

      if (debug)
        fprintf (stderr, "  - failed to locate using absolute path\n");
    }
  else
    for (pl = pprefix->plist; pl; pl = pl->next)
      {
        strcpy (temp, pl->prefix);
        strcat (temp, name);
        
        if (access (temp, X_OK) == 0)
          return temp;

#ifdef EXECUTABLE_SUFFIX
        /* Some systems have a suffix for executable files.
           So try appending that.  */
        strcat (temp, EXECUTABLE_SUFFIX);
        
        if (access (temp, X_OK) == 0)
          return temp;
#endif
      }

  if (debug && pprefix->plist == NULL)
    fprintf (stderr, "  - failed: no entries in prefix list\n");

  free (temp);
  return 0;
}

/* Add an entry for PREFIX to prefix list PPREFIX.  */

static void
add_prefix (pprefix, prefix)
     struct path_prefix *pprefix;
     char *prefix;
{
  struct prefix_list *pl, **prev;
  int len;

  if (pprefix->plist)
    {
      for (pl = pprefix->plist; pl->next; pl = pl->next)
        ;
      prev = &pl->next;
    }
  else
    prev = &pprefix->plist;

  /* Keep track of the longest prefix */

  len = strlen (prefix);
  if (len > pprefix->max_len)
    pprefix->max_len = len;

  pl = (struct prefix_list *) xmalloc (sizeof (struct prefix_list));
  pl->prefix = xstrdup (prefix);

  if (*prev)
    pl->next = *prev;
  else
    pl->next = (struct prefix_list *) 0;
  *prev = pl;
}
\f
/* Take the value of the environment variable ENV, break it into a path, and
   add of the entries to PPREFIX.  */

static void
prefix_from_env (env, pprefix)
     char *env;
     struct path_prefix *pprefix;
{
  char *p;
  GET_ENV_PATH_LIST (p, env);

  if (p)
    prefix_from_string (p, pprefix);
}

static void
prefix_from_string (p, pprefix)
     char *p;
     struct path_prefix *pprefix;
{
  char *startp, *endp;
  char *nstore = (char *) xmalloc (strlen (p) + 3);

  if (debug)
    fprintf (stderr, "Convert string '%s' into prefixes, separator = '%c'\n", p, PATH_SEPARATOR);
  
  startp = endp = p;
  while (1)
    {
      if (*endp == PATH_SEPARATOR || *endp == 0)
        {
          strncpy (nstore, startp, endp-startp);
          if (endp == startp)
            {
              strcpy (nstore, "./");
            }
          else if (endp[-1] != '/')
            {
              nstore[endp-startp] = '/';
              nstore[endp-startp+1] = 0;
            }
          else
            nstore[endp-startp] = 0;

          if (debug)
            fprintf (stderr, "  - add prefix: %s\n", nstore);
          
          add_prefix (pprefix, nstore);
          if (*endp == 0)
            break;
          endp = startp = endp + 1;
        }
      else
        endp++;
    }
}
\f
/* Main program.  */

int
main (argc, argv)
     int argc;
     char *argv[];
{
  char *ld_suffix       = "ld";
  char *full_ld_suffix  = ld_suffix;
  char *real_ld_suffix  = "real-ld";
  char *collect_ld_suffix = "collect-ld";
  char *nm_suffix       = "nm";
  char *full_nm_suffix  = nm_suffix;
  char *gnm_suffix      = "gnm";
  char *full_gnm_suffix = gnm_suffix;
#ifdef LDD_SUFFIX
  char *ldd_suffix      = LDD_SUFFIX;
  char *full_ldd_suffix = ldd_suffix;
#endif
  char *strip_suffix    = "strip";
  char *full_strip_suffix = strip_suffix;
  char *gstrip_suffix   = "gstrip";
  char *full_gstrip_suffix = gstrip_suffix;
  char *arg;
  FILE *outf;
#ifdef COLLECT_EXPORT_LIST
  FILE *exportf;
  FILE *importf;
#endif
  char *ld_file_name;
  char *p;
  char **c_argv;
  char **c_ptr;
  char **ld1_argv;
  char **ld1;
  char **ld2_argv;
  char **ld2;
  char **object_lst;
  char **object;
  int first_file;
  int num_c_args        = argc+9;

  setlocale (LC_MESSAGES, "");
  bindtextdomain (PACKAGE, localedir);
  textdomain (PACKAGE);

  /* Do not invoke xcalloc before this point, since locale needs to be
     set first, in case a diagnostic is issued.  */

  ld1 = ld1_argv = (char **) xcalloc (sizeof (char *), argc+3);
  ld2 = ld2_argv = (char **) xcalloc (sizeof (char *), argc+6);
  object = object_lst = (char **) xcalloc (sizeof (char *), argc);

#ifdef DEBUG
  debug = 1;
#endif

  /* Parse command line early for instances of -debug.  This allows
     the debug flag to be set before functions like find_a_file()
     are called.  */
  {
    int i;
    
    for (i = 1; argv[i] != NULL; i ++)
      if (! strcmp (argv[i], "-debug"))
        debug = 1;
    vflag = debug;
  }

#ifndef DEFAULT_A_OUT_NAME
  output_file = "a.out";
#else
  output_file = DEFAULT_A_OUT_NAME;
#endif

  obstack_begin (&temporary_obstack, 0);
  obstack_begin (&permanent_obstack, 0);
  temporary_firstobj = (char *) obstack_alloc (&temporary_obstack, 0);

  current_demangling_style = gnu_demangling;
  p = getenv ("COLLECT_GCC_OPTIONS");
  while (p && *p)
    {
      char *q = extract_string (&p);
      if (*q == '-' && (q[1] == 'm' || q[1] == 'f'))
        num_c_args++;
    }
  obstack_free (&temporary_obstack, temporary_firstobj);
  ++num_c_args;

  c_ptr = c_argv = (char **) xcalloc (sizeof (char *), num_c_args);

  if (argc < 2)
    fatal ("no arguments");

#ifdef SIGQUIT
  if (signal (SIGQUIT, SIG_IGN) != SIG_IGN)
    signal (SIGQUIT, handler);
#endif
  if (signal (SIGINT, SIG_IGN) != SIG_IGN)
    signal (SIGINT, handler);
#ifdef SIGALRM
  if (signal (SIGALRM, SIG_IGN) != SIG_IGN)
    signal (SIGALRM, handler);
#endif
#ifdef SIGHUP
  if (signal (SIGHUP, SIG_IGN) != SIG_IGN)
    signal (SIGHUP, handler);
#endif
  if (signal (SIGSEGV, SIG_IGN) != SIG_IGN)
    signal (SIGSEGV, handler);
#ifdef SIGBUS
  if (signal (SIGBUS, SIG_IGN) != SIG_IGN)
    signal (SIGBUS, handler);
#endif

  /* Extract COMPILER_PATH and PATH into our prefix list.  */
  prefix_from_env ("COMPILER_PATH", &cpath);
  prefix_from_env ("PATH", &path);

#ifdef CROSS_COMPILE
  /* If we look for a program in the compiler directories, we just use
     the short name, since these directories are already system-specific.
     But it we look for a program in the system directories, we need to
     qualify the program name with the target machine.  */

  full_ld_suffix
    = xcalloc (strlen (ld_suffix) + strlen (target_machine) + 2, 1);
  strcpy (full_ld_suffix, target_machine);
  strcat (full_ld_suffix, "-");
  strcat (full_ld_suffix, ld_suffix);

#if 0
  full_gld_suffix
    = xcalloc (strlen (gld_suffix) + strlen (target_machine) + 2, 1);
  strcpy (full_gld_suffix, target_machine);
  strcat (full_gld_suffix, "-");
  strcat (full_gld_suffix, gld_suffix);
#endif

  full_nm_suffix
    = xcalloc (strlen (nm_suffix) + strlen (target_machine) + 2, 1);
  strcpy (full_nm_suffix, target_machine);
  strcat (full_nm_suffix, "-");
  strcat (full_nm_suffix, nm_suffix);

  full_gnm_suffix
    = xcalloc (strlen (gnm_suffix) + strlen (target_machine) + 2, 1);
  strcpy (full_gnm_suffix, target_machine);
  strcat (full_gnm_suffix, "-");
  strcat (full_gnm_suffix, gnm_suffix);

#ifdef LDD_SUFFIX
  full_ldd_suffix
    = xcalloc (strlen (ldd_suffix) + strlen (target_machine) + 2, 1);
  strcpy (full_ldd_suffix, target_machine);
  strcat (full_ldd_suffix, "-");
  strcat (full_ldd_suffix, ldd_suffix);
#endif

  full_strip_suffix
    = xcalloc (strlen (strip_suffix) + strlen (target_machine) + 2, 1);
  strcpy (full_strip_suffix, target_machine);
  strcat (full_strip_suffix, "-");
  strcat (full_strip_suffix, strip_suffix);
  
  full_gstrip_suffix
    = xcalloc (strlen (gstrip_suffix) + strlen (target_machine) + 2, 1);
  strcpy (full_gstrip_suffix, target_machine);
  strcat (full_gstrip_suffix, "-");
  strcat (full_gstrip_suffix, gstrip_suffix);
#endif /* CROSS_COMPILE */

  /* Try to discover a valid linker/nm/strip to use.  */

  /* Maybe we know the right file to use (if not cross).  */
  ld_file_name = 0;
#ifdef DEFAULT_LINKER
  if (access (DEFAULT_LINKER, X_OK) == 0)
    ld_file_name = DEFAULT_LINKER;
  if (ld_file_name == 0)
#endif
#ifdef REAL_LD_FILE_NAME
  ld_file_name = find_a_file (&path, REAL_LD_FILE_NAME);
  if (ld_file_name == 0)
#endif
  /* Search the (target-specific) compiler dirs for ld'.  */
  ld_file_name = find_a_file (&cpath, real_ld_suffix);
  /* Likewise for `collect-ld'.  */
  if (ld_file_name == 0)
    ld_file_name = find_a_file (&cpath, collect_ld_suffix);
  /* Search the compiler directories for `ld'.  We have protection against
     recursive calls in find_a_file.  */
  if (ld_file_name == 0)
    ld_file_name = find_a_file (&cpath, ld_suffix);
  /* Search the ordinary system bin directories
     for `ld' (if native linking) or `TARGET-ld' (if cross).  */
  if (ld_file_name == 0)
    ld_file_name = find_a_file (&path, full_ld_suffix);

#ifdef REAL_NM_FILE_NAME
  nm_file_name = find_a_file (&path, REAL_NM_FILE_NAME);
  if (nm_file_name == 0)
#endif
  nm_file_name = find_a_file (&cpath, gnm_suffix);
  if (nm_file_name == 0)
    nm_file_name = find_a_file (&path, full_gnm_suffix);
  if (nm_file_name == 0)
    nm_file_name = find_a_file (&cpath, nm_suffix);
  if (nm_file_name == 0)
    nm_file_name = find_a_file (&path, full_nm_suffix);

#ifdef LDD_SUFFIX
  ldd_file_name = find_a_file (&cpath, ldd_suffix);
  if (ldd_file_name == 0)
    ldd_file_name = find_a_file (&path, full_ldd_suffix);
#endif

#ifdef REAL_STRIP_FILE_NAME
  strip_file_name = find_a_file (&path, REAL_STRIP_FILE_NAME);
  if (strip_file_name == 0)
#endif
  strip_file_name = find_a_file (&cpath, gstrip_suffix);
  if (strip_file_name == 0)
    strip_file_name = find_a_file (&path, full_gstrip_suffix);
  if (strip_file_name == 0)
    strip_file_name = find_a_file (&cpath, strip_suffix);
  if (strip_file_name == 0)
    strip_file_name = find_a_file (&path, full_strip_suffix);

  /* Determine the full path name of the C compiler to use.  */
  c_file_name = getenv ("COLLECT_GCC");
  if (c_file_name == 0)
    {
#ifdef CROSS_COMPILE
      c_file_name = xcalloc (sizeof ("gcc-") + strlen (target_machine) + 1, 1);
      strcpy (c_file_name, target_machine);
      strcat (c_file_name, "-gcc");
#else
      c_file_name = "gcc";
#endif
    }

  p = find_a_file (&cpath, c_file_name);

  /* Here it should be safe to use the system search path since we should have
     already qualified the name of the compiler when it is needed.  */
  if (p == 0)
    p = find_a_file (&path, c_file_name);

  if (p)
    c_file_name = p;

  *ld1++ = *ld2++ = ld_file_name;

  /* Make temp file names.  */
  c_file = make_temp_file (".c");
  o_file = make_temp_file (".o");
#ifdef COLLECT_EXPORT_LIST
  export_file = make_temp_file (".x");
  import_file = make_temp_file (".p");
#endif
  ldout = make_temp_file (".ld");
  *c_ptr++ = c_file_name;
  *c_ptr++ = "-x";
  *c_ptr++ = "c";
  *c_ptr++ = "-c";
  *c_ptr++ = "-o";
  *c_ptr++ = o_file;

#ifdef COLLECT_EXPORT_LIST
  /* Generate a list of directories from LIBPATH.  */
  prefix_from_env ("LIBPATH", &libpath_lib_dirs);
  /* Add to this list also two standard directories where
     AIX loader always searches for libraries.  */
  add_prefix (&libpath_lib_dirs, "/lib");
  add_prefix (&libpath_lib_dirs, "/usr/lib");
#endif

  /* Get any options that the upper GCC wants to pass to the sub-GCC.  

     AIX support needs to know if -shared has been specified before
     parsing commandline arguments.  */

  p = getenv ("COLLECT_GCC_OPTIONS");
  while (p && *p)
    {
      char *q = extract_string (&p);
      if (*q == '-' && (q[1] == 'm' || q[1] == 'f'))
        *c_ptr++ = obstack_copy0 (&permanent_obstack, q, strlen (q));
      if (strcmp (q, "-EL") == 0 || strcmp (q, "-EB") == 0)
        *c_ptr++ = obstack_copy0 (&permanent_obstack, q, strlen (q));
      if (strncmp (q, "-shared", sizeof ("-shared") - 1) == 0)
        shared_obj = 1;
    }
  obstack_free (&temporary_obstack, temporary_firstobj);
  *c_ptr++ = "-fno-exceptions";

  /* !!! When GCC calls collect2,
     it does not know whether it is calling collect2 or ld.
     So collect2 cannot meaningfully understand any options
     except those ld understands.
     If you propose to make GCC pass some other option,
     just imagine what will happen if ld is really ld!!!  */

  /* Parse arguments.  Remember output file spec, pass the rest to ld.  */
  /* After the first file, put in the c++ rt0.  */

  first_file = 1;
  while ((arg = *++argv) != (char *) 0)
    {
      *ld1++ = *ld2++ = arg;

      if (arg[0] == '-')
        {
          switch (arg[1])
            {
#ifdef COLLECT_EXPORT_LIST
            /* We want to disable automatic exports on AIX when user
               explicitly puts an export list in command line */
            case 'b':
              if (arg[2] == 'E' || strncmp (&arg[2], "export", 6) == 0)
                export_flag = 1;
              else if (arg[2] == '6' && arg[3] == '4')
                aix64_flag = 1;
              break;
#endif

            case 'd':
              if (!strcmp (arg, "-debug"))
                {
                  /* Already parsed.  */
                  ld1--;
                  ld2--;
                }
              break;

            case 'l':
              if (first_file)
                {
                  /* place o_file BEFORE this argument! */
                  first_file = 0;
                  ld2--;
                  *ld2++ = o_file;
                  *ld2++ = arg;
                }
#ifdef COLLECT_EXPORT_LIST
              {
                /* Resolving full library name.  */
                char *s = resolve_lib_name (arg+2);

                /* If we will use an import list for this library,
                   we should exclude it from ld args.  */
                if (use_import_list (s))
                  {
                    ld1--;
                    ld2--;
                  }

                /* Saving a full library name.  */
                add_to_list (&libs, s);
              }
#endif
              break;

#ifdef COLLECT_EXPORT_LIST
            /* Saving directories where to search for libraries.  */
            case 'L':
              add_prefix (&cmdline_lib_dirs, arg+2);
              break;
#endif

            case 'o':
              if (arg[2] == '\0')
                output_file = *ld1++ = *ld2++ = *++argv;
              else
                output_file = &arg[2];
              break;

            case 'r':
              if (arg[2] == '\0')
                rflag = 1;
              break;

            case 's':
              if (arg[2] == '\0' && do_collecting)
                {
                  /* We must strip after the nm run, otherwise C++ linking
                     will not work.  Thus we strip in the second ld run, or
                     else with strip if there is no second ld run.  */
                  strip_flag = 1;
                  ld1--;
                }
              break;

            case 'v':
              if (arg[2] == '\0')
                vflag = 1;
              break;
            }
        }
      else if ((p = rindex (arg, '.')) != (char *) 0
               && (strcmp (p, ".o") == 0 || strcmp (p, ".a") == 0
                   || strcmp (p, ".so") == 0))
        {
          if (first_file)
            {
              first_file = 0;
              if (p[1] == 'o')
                *ld2++ = o_file;
              else
                {
                  /* place o_file BEFORE this argument! */
                  ld2--;
                  *ld2++ = o_file;
                  *ld2++ = arg;
                }
            }
          if (p[1] == 'o')
            *object++ = arg;
#ifdef COLLECT_EXPORT_LIST
          /* libraries can be specified directly, i.e. without -l flag.  */
          else
            { 
              /* If we will use an import list for this library,
                 we should exclude it from ld args.  */
              if (use_import_list (arg))
                {
                  ld1--;
                  ld2--;
                }

              /* Saving a full library name.  */
              add_to_list (&libs, arg);
            }
#endif
        }
    }

#ifdef COLLECT_EXPORT_LIST
  /* This is added only for debugging purposes.  */
  if (debug)
    {
      fprintf (stderr, "List of libraries:\n");
      dump_list (stderr, "\t", libs.first);
    }

  /* The AIX linker will discard static constructors in object files if
     nothing else in the file is referenced, so look at them first.  */
  {
      char **export_object_lst = object_lst;
      while (export_object_lst < object)
        scan_prog_file (*export_object_lst++, PASS_OBJ);
  }
  {
    struct id *list = libs.first;
    for (; list; list = list->next)
      scan_prog_file (list->name, PASS_FIRST);
  }
  {
    char *buf1 = alloca (strlen (export_file) + 5);
    char *buf2 = alloca (strlen (import_file) + 5);
    sprintf (buf1, "-bE:%s", export_file);
    sprintf (buf2, "-bI:%s", import_file);
    *ld1++ = buf1;
    *ld2++ = buf1;
    *ld1++ = buf2;
    *ld2++ = buf2;
    exportf = fopen (export_file, "w");
    if (exportf == (FILE *) 0)
      fatal_perror ("fopen %s", export_file);
    write_export_file (exportf);
    if (fclose (exportf))
      fatal_perror ("fclose %s", export_file);
    importf = fopen (import_file, "w");
    if (importf == (FILE *) 0)
      fatal_perror ("%s", import_file);
    write_import_file (importf);
    if (fclose (importf))
      fatal_perror ("fclose %s", import_file);
  }
#endif

  *c_ptr++ = c_file;
  *object = *c_ptr = *ld1 = (char *) 0;

  if (vflag)
    {
      notice ("collect2 version %s", version_string);
#ifdef TARGET_VERSION
      TARGET_VERSION;
#endif
      fprintf (stderr, "\n");
    }

  if (debug)
    {
      char *ptr;
      fprintf (stderr, "ld_file_name        = %s\n",
               (ld_file_name ? ld_file_name : "not found"));
      fprintf (stderr, "c_file_name         = %s\n",
               (c_file_name ? c_file_name : "not found"));
      fprintf (stderr, "nm_file_name        = %s\n",
               (nm_file_name ? nm_file_name : "not found"));
#ifdef LDD_SUFFIX
      fprintf (stderr, "ldd_file_name       = %s\n",
               (ldd_file_name ? ldd_file_name : "not found"));
#endif
      fprintf (stderr, "strip_file_name     = %s\n",
               (strip_file_name ? strip_file_name : "not found"));
      fprintf (stderr, "c_file              = %s\n",
               (c_file ? c_file : "not found"));
      fprintf (stderr, "o_file              = %s\n",
               (o_file ? o_file : "not found"));

      ptr = getenv ("COLLECT_GCC_OPTIONS");
      if (ptr)
        fprintf (stderr, "COLLECT_GCC_OPTIONS = %s\n", ptr);

      ptr = getenv ("COLLECT_GCC");
      if (ptr)
        fprintf (stderr, "COLLECT_GCC         = %s\n", ptr);

      ptr = getenv ("COMPILER_PATH");
      if (ptr)
        fprintf (stderr, "COMPILER_PATH       = %s\n", ptr);

      ptr = getenv ("LIBRARY_PATH");
      if (ptr)
        fprintf (stderr, "LIBRARY_PATH        = %s\n", ptr);

      fprintf (stderr, "\n");
    }

  /* Load the program, searching all libraries and attempting to provide
     undefined symbols from repository information.  */

  /* On AIX we do this later.  */
#ifndef COLLECT_EXPORT_LIST
  do_tlink (ld1_argv, object_lst); 
#endif

  /* If -r or they will be run via some other method, do not build the
     constructor or destructor list, just return now.  */
  if (rflag
#ifndef COLLECT_EXPORT_LIST
      || ! do_collecting
#endif
      )
    {
#ifdef COLLECT_EXPORT_LIST
      /* But make sure we delete the export file we may have created.  */
      if (export_file != 0 && export_file[0])
        maybe_unlink (export_file);
      if (import_file != 0 && import_file[0])
        maybe_unlink (import_file);
#endif
      maybe_unlink (c_file);
      maybe_unlink (o_file);
      return 0;
    }

  /* Examine the namelist with nm and search it for static constructors
     and destructors to call.
     Write the constructor and destructor tables to a .s file and reload.  */

  /* On AIX we already done scanning for global constructors/destructors.  */
#ifndef COLLECT_EXPORT_LIST
  scan_prog_file (output_file, PASS_FIRST);
#endif

#ifdef SCAN_LIBRARIES
  scan_libraries (output_file);
#endif

  if (debug)
    {
      notice ("%d constructor(s) found\n", constructors.number);
      notice ("%d destructor(s)  found\n", destructors.number);
    }

  if (constructors.number == 0 && destructors.number == 0
      && frame_tables.number == 0
#if defined (SCAN_LIBRARIES) || defined (COLLECT_EXPORT_LIST)
      /* If we will be running these functions ourselves, we want to emit
         stubs into the shared library so that we do not have to relink
         dependent programs when we add static objects.  */
      && ! shared_obj
#endif
      )
    {
#ifdef COLLECT_EXPORT_LIST
      /* Doing tlink without additional code generation */
      do_tlink (ld1_argv, object_lst);
#endif
      /* Strip now if it was requested on the command line.  */
      if (strip_flag)
        {
          char **strip_argv = (char **) xcalloc (sizeof (char *), 3);
          strip_argv[0] = strip_file_name;
          strip_argv[1] = output_file;
          strip_argv[2] = (char *) 0;
          fork_execute ("strip", strip_argv);
        }

#ifdef COLLECT_EXPORT_LIST
      maybe_unlink (export_file);
      maybe_unlink (import_file);
#endif
      maybe_unlink (c_file);
      maybe_unlink (o_file);
      return 0;
    }

  /* Sort ctor and dtor lists by priority. */
  sort_ids (&constructors);
  sort_ids (&destructors);

  maybe_unlink(output_file);
  outf = fopen (c_file, "w");
  if (outf == (FILE *) 0)
    fatal_perror ("fopen %s", c_file);

  write_c_file (outf, c_file);

  if (fclose (outf))
    fatal_perror ("fclose %s", c_file);

  /* Tell the linker that we have initializer and finalizer functions.  */
#ifdef LD_INIT_SWITCH
  *ld2++ = LD_INIT_SWITCH;
  *ld2++ = initname;
  *ld2++ = LD_FINI_SWITCH;
  *ld2++ = fininame;
#endif
  *ld2 = (char*) 0;

#ifdef COLLECT_EXPORT_LIST
  if (shared_obj)
    {
      add_to_list (&exports, initname);
      add_to_list (&exports, fininame);
      add_to_list (&exports, "_GLOBAL__DI");
      add_to_list (&exports, "_GLOBAL__DD");
      exportf = fopen (export_file, "w");
      if (exportf == (FILE *) 0)
        fatal_perror ("fopen %s", export_file);
      write_export_file (exportf);
      if (fclose (exportf))
        fatal_perror ("fclose %s", export_file);
    }
#endif

  if (debug)
    {
      fprintf (stderr, "\n========== output_file = %s, c_file = %s\n",
               output_file, c_file);
      write_c_file (stderr, "stderr");
      fprintf (stderr, "========== end of c_file\n\n");
#ifdef COLLECT_EXPORT_LIST
      fprintf (stderr, "\n========== export_file = %s\n", export_file);
      write_export_file (stderr);
      fprintf (stderr, "========== end of export_file\n\n");
#endif
    }

  /* Assemble the constructor and destructor tables.
     Link the tables in with the rest of the program.  */

  fork_execute ("gcc",  c_argv);
#ifdef COLLECT_EXPORT_LIST
  /* On AIX we must call tlink because of possible templates resolution */
  do_tlink (ld2_argv, object_lst);
#else
  /* Otherwise, simply call ld because tlink is already done */
  fork_execute ("ld", ld2_argv);

  /* Let scan_prog_file do any final mods (OSF/rose needs this for
     constructors/destructors in shared libraries.  */
  scan_prog_file (output_file, PASS_SECOND);
#endif 

  maybe_unlink (c_file);
  maybe_unlink (o_file);

#ifdef COLLECT_EXPORT_LIST
  maybe_unlink (export_file);
  maybe_unlink (import_file);
#endif

  return 0;
}

\f
/* Wait for a process to finish, and exit if a non-zero status is found.  */

int
collect_wait (prog)
     char *prog;
{
  int status;

  wait (&status);
  if (status)
    {
      if (WIFSIGNALED (status))
        {
          int sig = WTERMSIG (status);
          error ((status & 0200
                  ? "%s terminated with signal %d [%s]"
                  : "%s terminated with signal %d [%s], core dumped"),
                 prog,
                 sig,
                 my_strsignal(sig));
          collect_exit (FATAL_EXIT_CODE);
        }

      if (WIFEXITED (status))
        return WEXITSTATUS (status);
    }
  return 0;
}

static void
do_wait (prog)
     char *prog;
{
  int ret = collect_wait (prog);
  if (ret != 0)
    {
      error ("%s returned %d exit status", prog, ret);
      collect_exit (ret);
    }
}

\f
/* Fork and execute a program, and wait for the reply.  */

void
collect_execute (prog, argv, redir)
     char *prog;
     char **argv;
     char *redir;
{
  int pid;

  if (vflag || debug)
    {
      char **p_argv;
      char *str;

      if (argv[0])
        fprintf (stderr, "%s", argv[0]);
      else
        notice ("[cannot find %s]", prog);

      for (p_argv = &argv[1]; (str = *p_argv) != (char *) 0; p_argv++)
        fprintf (stderr, " %s", str);

      fprintf (stderr, "\n");
    }

  fflush (stdout);
  fflush (stderr);

  /* If we cannot find a program we need, complain error.  Do this here
     since we might not end up needing something that we could not find.  */

  if (argv[0] == 0)
    fatal ("cannot find `%s'", prog);

#ifndef __CYGWIN__
  pid = vfork ();
  if (pid == -1)
    fatal_perror (VFORK_STRING);

  if (pid == 0)                 /* child context */
    {
      if (redir)
        {
          unlink (redir);
          if (freopen (redir, "a", stdout) == NULL)
            fatal_perror ("freopen stdout %s", redir);
          if (freopen (redir, "a", stderr) == NULL)
            fatal_perror ("freopen stderr %s", redir);
        }

      execvp (argv[0], argv);
      fatal_perror ("execvp %s", prog);
    }
#else
  pid = _spawnvp (_P_NOWAIT, argv[0], argv);
  if (pid == -1)
    fatal ("spawnvp failed");
#endif
}

static void
fork_execute (prog, argv)
     char *prog;
     char **argv;
{
  collect_execute (prog, argv, NULL);
  do_wait (prog);
}
\f
/* Unlink a file unless we are debugging.  */

static void
maybe_unlink (file)
     char *file;
{
  if (!debug)
    unlink (file);
  else
    notice ("[Leaving %s]\n", file);
}

\f
static long sequence_number = 0;

/* Add a name to a linked list.  */

static void
add_to_list (head_ptr, name)
     struct head *head_ptr;
     char *name;
{
  struct id *newid
    = (struct id *) xcalloc (sizeof (struct id) + strlen (name), 1);
  struct id *p;
  strcpy (newid->name, name);

  if (head_ptr->first)
    head_ptr->last->next = newid;
  else
    head_ptr->first = newid;

  /* Check for duplicate symbols.  */
  for (p = head_ptr->first;
       strcmp (name, p->name) != 0;
       p = p->next)
    ;
  if (p != newid)
    {
      head_ptr->last->next = 0;
      free (newid);
      return;
    }

  newid->sequence = ++sequence_number;
  head_ptr->last = newid;
  head_ptr->number++;
}

/* Grab the init priority number from an init function name that
   looks like "_GLOBAL_.I.12345.foo".  */

static int
extract_init_priority (name)
     char *name;
{
  int pos = 0, pri;

  while (name[pos] == '_')
    ++pos;
  pos += 10; /* strlen ("GLOBAL__X_") */

  /* Extract init_p number from ctor/dtor name. */
  pri = atoi (name + pos);
  return pri ? pri : DEFAULT_INIT_PRIORITY;
}

/* Insertion sort the ids from ctor/dtor list HEAD_PTR in descending order.
   ctors will be run from right to left, dtors from left to right.  */

static void
sort_ids (head_ptr)
     struct head *head_ptr;
{
  /* id holds the current element to insert.  id_next holds the next
     element to insert.  id_ptr iterates through the already sorted elements
     looking for the place to insert id.  */
  struct id *id, *id_next, **id_ptr;

  id = head_ptr->first;

  /* We don't have any sorted elements yet.  */
  head_ptr->first = NULL;

  for (; id; id = id_next)
    {
      id_next = id->next;
      id->sequence = extract_init_priority (id->name);

      for (id_ptr = &(head_ptr->first); ; id_ptr = &((*id_ptr)->next))
        if (*id_ptr == NULL
            /* If the sequence numbers are the same, we put the id from the
               file later on the command line later in the list.  */
            || id->sequence > (*id_ptr)->sequence
            /* Hack: do lexical compare, too.
            || (id->sequence == (*id_ptr)->sequence
                && strcmp (id->name, (*id_ptr)->name) > 0) */
            )
          {
            id->next = *id_ptr;
            *id_ptr = id;
            break;
          }
    }

  /* Now set the sequence numbers properly so write_c_file works.  */
  for (id = head_ptr->first; id; id = id->next)
    id->sequence = ++sequence_number;
}

/* Write: `prefix', the names on list LIST, `suffix'.  */

static void
write_list (stream, prefix, list)
     FILE *stream;
     char *prefix;
     struct id *list;
{
  while (list)
    {
      fprintf (stream, "%sx%d,\n", prefix, list->sequence);
      list = list->next;
    }
}

#ifdef COLLECT_EXPORT_LIST
/* This function is really used only on AIX, but may be useful.  */
static int
is_in_list (prefix, list)
     char *prefix;
     struct id *list;
{
  while (list)
    {
      if (!strcmp (prefix, list->name)) return 1;
      list = list->next;
    }
    return 0;
}
#endif

/* Added for debugging purpose.  */
#ifdef COLLECT_EXPORT_LIST
static void
dump_list (stream, prefix, list)
     FILE *stream;
     char *prefix;
     struct id *list;
{
  while (list)
    {
      fprintf (stream, "%s%s,\n", prefix, list->name);
      list = list->next;
    }
}
#endif

#if 0
static void
dump_prefix_list (stream, prefix, list)
     FILE *stream;
     char *prefix;
     struct prefix_list *list;
{
  while (list)
    {
      fprintf (stream, "%s%s,\n", prefix, list->prefix);
      list = list->next;
    }
}
#endif

static void
write_list_with_asm (stream, prefix, list)
     FILE *stream;
     char *prefix;
     struct id *list;
{
  while (list)
    {
      fprintf (stream, "%sx%d __asm__ (\"%s\");\n",
               prefix, list->sequence, list->name);
      list = list->next;
    }
}

/* Write out the constructor and destructor tables statically (for a shared
   object), along with the functions to execute them.  */

static void
write_c_file_stat (stream, name)
     FILE *stream;
     char *name;
{
  char *prefix, *p, *q;
  int frames = (frame_tables.number > 0);

  /* Figure out name of output_file, stripping off .so version.  */
  p = rindex (output_file, '/');
  if (p == 0)
    p = (char *) output_file;
  else
    p++;
  q = p;
  while (q)
    {
      q = index (q,'.');
      if (q == 0)
        {
          q = p + strlen (p);
          break;
        }
      else
        {
          if (strncmp (q, ".so", 3) == 0)
            {
              q += 3;
              break;
            }
          else
            q++;
        }
    }
  /* q points to null at end of the string (or . of the .so version) */
  prefix = xmalloc (q - p + 1);
  strncpy (prefix, p, q - p);
  prefix[q - p] = 0;
  for (q = prefix; *q; q++)
    if (!ISALNUM ((unsigned char)*q))
      *q = '_';
  if (debug)
    notice ("\nwrite_c_file - output name is %s, prefix is %s\n",
            output_file, prefix);

#define INIT_NAME_FORMAT "_GLOBAL__FI_%s"
  initname = xmalloc (strlen (prefix) + sizeof (INIT_NAME_FORMAT) - 2);
  sprintf (initname, INIT_NAME_FORMAT, prefix);

#define FINI_NAME_FORMAT "_GLOBAL__FD_%s"
  fininame = xmalloc (strlen (prefix) + sizeof (FINI_NAME_FORMAT) - 2);
  sprintf (fininame, FINI_NAME_FORMAT, prefix);

  free (prefix);

  /* Write the tables as C code  */

  fprintf (stream, "static int count;\n");
  fprintf (stream, "typedef void entry_pt();\n");
  write_list_with_asm (stream, "extern entry_pt ", constructors.first);

  if (frames)
    {
      write_list_with_asm (stream, "extern void *", frame_tables.first);

      fprintf (stream, "\tstatic void *frame_table[] = {\n");
      write_list (stream, "\t\t&", frame_tables.first);
      fprintf (stream, "\t0\n};\n");

      /* This must match what's in frame.h.  */
      fprintf (stream, "struct object {\n");
      fprintf (stream, "  void *pc_begin;\n");
      fprintf (stream, "  void *pc_end;\n");
      fprintf (stream, "  void *fde_begin;\n");
      fprintf (stream, "  void *fde_array;\n");
      fprintf (stream, "  __SIZE_TYPE__ count;\n");
      fprintf (stream, "  struct object *next;\n");
      fprintf (stream, "};\n");

      fprintf (stream, "extern void __register_frame_info_table (void *, struct object *);\n");
      fprintf (stream, "extern void *__deregister_frame_info (void *);\n");

      fprintf (stream, "static void reg_frame () {\n");
      fprintf (stream, "\tstatic struct object ob;\n");
      fprintf (stream, "\t__register_frame_info_table (frame_table, &ob);\n");
      fprintf (stream, "\t}\n");

      fprintf (stream, "static void dereg_frame () {\n");
      fprintf (stream, "\t__deregister_frame_info (frame_table);\n");
      fprintf (stream, "\t}\n");
    }

  fprintf (stream, "void %s() {\n", initname);
  if (constructors.number > 0 || frames)
    {
      fprintf (stream, "\tstatic entry_pt *ctors[] = {\n");
      write_list (stream, "\t\t", constructors.first);
      if (frames)
        fprintf (stream, "\treg_frame,\n");
      fprintf (stream, "\t};\n");
      fprintf (stream, "\tentry_pt **p;\n");
      fprintf (stream, "\tif (count++ != 0) return;\n");
      fprintf (stream, "\tp = ctors + %d;\n", constructors.number + frames);
      fprintf (stream, "\twhile (p > ctors) (*--p)();\n");
    }
  else
    fprintf (stream, "\t++count;\n");
  fprintf (stream, "}\n");
  write_list_with_asm (stream, "extern entry_pt ", destructors.first);
  fprintf (stream, "void %s() {\n", fininame);
  if (destructors.number > 0 || frames)
    {
      fprintf (stream, "\tstatic entry_pt *dtors[] = {\n");
      write_list (stream, "\t\t", destructors.first);
      if (frames)
        fprintf (stream, "\tdereg_frame,\n");
      fprintf (stream, "\t};\n");
      fprintf (stream, "\tentry_pt **p;\n");
      fprintf (stream, "\tif (--count != 0) return;\n");
      fprintf (stream, "\tp = dtors;\n");
      fprintf (stream, "\twhile (p < dtors + %d) (*p++)();\n",
               destructors.number + frames);
    }
  fprintf (stream, "}\n");

  if (shared_obj)
    {
      fprintf (stream, "void _GLOBAL__DI() {\n\t%s();\n}\n", initname);
      fprintf (stream, "void _GLOBAL__DD() {\n\t%s();\n}\n", fininame);
    }
}

/* Write the constructor/destructor tables.  */

#ifndef LD_INIT_SWITCH
static void
write_c_file_glob (stream, name)
     FILE *stream;
     char *name;
{
  /* Write the tables as C code  */

  int frames = (frame_tables.number > 0);

  fprintf (stream, "typedef void entry_pt();\n\n");
    
  write_list_with_asm (stream, "extern entry_pt ", constructors.first);

  if (frames)
    {
      write_list_with_asm (stream, "extern void *", frame_tables.first);

      fprintf (stream, "\tstatic void *frame_table[] = {\n");
      write_list (stream, "\t\t&", frame_tables.first);
      fprintf (stream, "\t0\n};\n");

      /* This must match what's in frame.h.  */
      fprintf (stream, "struct object {\n");
      fprintf (stream, "  void *pc_begin;\n");
      fprintf (stream, "  void *pc_end;\n");
      fprintf (stream, "  void *fde_begin;\n");
      fprintf (stream, "  void *fde_array;\n");
      fprintf (stream, "  __SIZE_TYPE__ count;\n");
      fprintf (stream, "  struct object *next;\n");
      fprintf (stream, "};\n");

      fprintf (stream, "extern void __register_frame_info_table (void *, struct object *);\n");
      fprintf (stream, "extern void *__deregister_frame_info (void *);\n");

      fprintf (stream, "static void reg_frame () {\n");
      fprintf (stream, "\tstatic struct object ob;\n");
      fprintf (stream, "\t__register_frame_info_table (frame_table, &ob);\n");
      fprintf (stream, "\t}\n");

      fprintf (stream, "static void dereg_frame () {\n");
      fprintf (stream, "\t__deregister_frame_info (frame_table);\n");
      fprintf (stream, "\t}\n");
    }

  fprintf (stream, "\nentry_pt * __CTOR_LIST__[] = {\n");
  fprintf (stream, "\t(entry_pt *) %d,\n", constructors.number + frames);
  write_list (stream, "\t", constructors.first);
  if (frames)
    fprintf (stream, "\treg_frame,\n");
  fprintf (stream, "\t0\n};\n\n");

  write_list_with_asm (stream, "extern entry_pt ", destructors.first);

  fprintf (stream, "\nentry_pt * __DTOR_LIST__[] = {\n");
  fprintf (stream, "\t(entry_pt *) %d,\n", destructors.number + frames);
  write_list (stream, "\t", destructors.first);
  if (frames)
    fprintf (stream, "\tdereg_frame,\n");
  fprintf (stream, "\t0\n};\n\n");

  fprintf (stream, "extern entry_pt %s;\n", NAME__MAIN);
  fprintf (stream, "entry_pt *__main_reference = %s;\n\n", NAME__MAIN);
}
#endif /* ! LD_INIT_SWITCH */

static void
write_c_file (stream, name)
     FILE *stream;
     char *name;
{
  fprintf (stream, "#ifdef __cplusplus\nextern \"C\" {\n#endif\n");
#ifndef LD_INIT_SWITCH
  if (! shared_obj)
    write_c_file_glob (stream, name);
  else
#endif
    write_c_file_stat (stream, name);
  fprintf (stream, "#ifdef __cplusplus\n}\n#endif\n");
}

#ifdef COLLECT_EXPORT_LIST
static void
write_export_file (stream)
     FILE *stream;
{
  struct id *list = exports.first;
  for (; list; list = list->next)
    fprintf (stream, "%s\n", list->name);
}

static void
write_import_file (stream)
     FILE *stream;
{
  struct id *list = imports.first;
  fprintf (stream, "%s\n", "#! .");
  for (; list; list = list->next)
    fprintf (stream, "%s\n", list->name);
}
#endif
\f
#ifdef OBJECT_FORMAT_NONE

/* Generic version to scan the name list of the loaded program for
   the symbols g++ uses for static constructors and destructors.

   The constructor table begins at __CTOR_LIST__ and contains a count
   of the number of pointers (or -1 if the constructors are built in a
   separate section by the linker), followed by the pointers to the
   constructor functions, terminated with a null pointer.  The
   destructor table has the same format, and begins at __DTOR_LIST__.  */

static void
scan_prog_file (prog_name, which_pass)
     char *prog_name;
     enum pass which_pass;
{
  void (*int_handler) ();
  void (*quit_handler) ();
  char *nm_argv[4];
  int pid;
  int argc = 0;
  int pipe_fd[2];
  char *p, buf[1024];
  FILE *inf;

  if (which_pass == PASS_SECOND)
    return;

  /* If we do not have an `nm', complain.  */
  if (nm_file_name == 0)
    fatal ("cannot find `nm'");

  nm_argv[argc++] = nm_file_name;
  if (NM_FLAGS[0] != '\0')
    nm_argv[argc++] = NM_FLAGS;

  nm_argv[argc++] = prog_name;
  nm_argv[argc++] = (char *) 0;

  if (pipe (pipe_fd) < 0)
    fatal_perror ("pipe");

  inf = fdopen (pipe_fd[0], "r");
  if (inf == (FILE *) 0)
    fatal_perror ("fdopen");

  /* Trace if needed.  */
  if (vflag)
    {
      char **p_argv;
      char *str;

      for (p_argv = &nm_argv[0]; (str = *p_argv) != (char *) 0; p_argv++)
        fprintf (stderr, " %s", str);

      fprintf (stderr, "\n");
    }

  fflush (stdout);
  fflush (stderr);

  /* Spawn child nm on pipe */
  pid = vfork ();
  if (pid == -1)
    fatal_perror (VFORK_STRING);

  if (pid == 0)                 /* child context */
    {
      /* setup stdout */
      if (dup2 (pipe_fd[1], 1) < 0)
        fatal_perror ("dup2 %d 1", pipe_fd[1]);

      if (close (pipe_fd[0]) < 0)
        fatal_perror ("close %d", pipe_fd[0]);

      if (close (pipe_fd[1]) < 0)
        fatal_perror ("close %d", pipe_fd[1]);

      execv (nm_file_name, nm_argv);
      fatal_perror ("execvp %s", nm_file_name);
    }

  /* Parent context from here on.  */
  int_handler  = (void (*) ())signal (SIGINT,  SIG_IGN);
#ifdef SIGQUIT
  quit_handler = (void (*) ())signal (SIGQUIT, SIG_IGN);
#endif

  if (close (pipe_fd[1]) < 0)
    fatal_perror ("close %d", pipe_fd[1]);

  if (debug)
    fprintf (stderr, "\nnm output with constructors/destructors.\n");

  /* Read each line of nm output.  */
  while (fgets (buf, sizeof buf, inf) != (char *) 0)
    {
      int ch, ch2;
      char *name, *end;

      /* If it contains a constructor or destructor name, add the name
         to the appropriate list.  */

      for (p = buf; (ch = *p) != '\0' && ch != '\n' && ch != '_'; p++)
        if (ch == ' ' && p[1] == 'U' && p[2] == ' ')
          break;

      if (ch != '_')
        continue;
  
      name = p;
      /* Find the end of the symbol name.
         Do not include `|', because Encore nm can tack that on the end.  */
      for (end = p; (ch2 = *end) != '\0' && !ISSPACE (ch2) && ch2 != '|';
           end++)
        continue;


      *end = '\0';
      switch (is_ctor_dtor (name))
        {
        case 1:
          if (which_pass != PASS_LIB)
            add_to_list (&constructors, name);
          break;

        case 2:
          if (which_pass != PASS_LIB)
            add_to_list (&destructors, name);
          break;

        case 3:
          if (which_pass != PASS_LIB)
            fatal ("init function found in object %s", prog_name);
#ifndef LD_INIT_SWITCH
          add_to_list (&constructors, name);
#endif
          break;

        case 4:
          if (which_pass != PASS_LIB)
            fatal ("fini function found in object %s", prog_name);
#ifndef LD_FINI_SWITCH
          add_to_list (&destructors, name);
#endif
          break;

        case 5:
          if (which_pass != PASS_LIB)
            add_to_list (&frame_tables, name);

        default:                /* not a constructor or destructor */
          continue;
        }

      if (debug)
        fprintf (stderr, "\t%s\n", buf);
    }

  if (debug)
    fprintf (stderr, "\n");

  if (fclose (inf) != 0)
    fatal_perror ("fclose");

  do_wait (nm_file_name);

  signal (SIGINT,  int_handler);
#ifdef SIGQUIT
  signal (SIGQUIT, quit_handler);
#endif
}

#if SUNOS4_SHARED_LIBRARIES

/* Routines to scan the SunOS 4 _DYNAMIC structure to find shared libraries
   that the output file depends upon and their initialization/finalization
   routines, if any.  */

#include <a.out.h>
#include <fcntl.h>
#include <link.h>
#include <sys/mman.h>
#include <sys/param.h>
#include <unistd.h>
#include <sys/dir.h>

/* pointers to the object file */
unsigned object;        /* address of memory mapped file */
unsigned objsize;       /* size of memory mapped to file */
char * code;            /* pointer to code segment */
char * data;            /* pointer to data segment */
struct nlist *symtab;   /* pointer to symbol table */
struct link_dynamic *ld;
struct link_dynamic_2 *ld_2;
struct head libraries;

/* Map the file indicated by NAME into memory and store its address.  */

static void
mapfile (name)
     char *name;
{
  int fp;
  struct stat s;
  if ((fp = open (name, O_RDONLY)) == -1)
    fatal ("unable to open file '%s'", name);
  if (fstat (fp, &s) == -1)
    fatal ("unable to stat file '%s'", name);

  objsize = s.st_size;
  object = (unsigned) mmap (0, objsize, PROT_READ|PROT_WRITE, MAP_PRIVATE,
                            fp, 0);
  if (object == -1)
    fatal ("unable to mmap file '%s'", name);

  close (fp);
}

/* Helpers for locatelib.  */

static char *libname;

static int
libselect (d)
     struct direct *d;
{
  return (strncmp (libname, d->d_name, strlen (libname)) == 0);
}

/* If one file has an additional numeric extension past LIBNAME, then put
   that one first in the sort.  If both files have additional numeric
   extensions, then put the one with the higher number first in the sort.

   We must verify that the extension is numeric, because Sun saves the
   original versions of patched libraries with a .FCS extension.  Files with
   invalid extensions must go last in the sort, so that they will not be used.  */

static int
libcompare (d1, d2)
     struct direct **d1, **d2;
{
  int i1, i2 = strlen (libname);
  char *e1 = (*d1)->d_name + i2;
  char *e2 = (*d2)->d_name + i2;

  while (*e1 && *e2 && *e1 == '.' && *e2 == '.'
         && e1[1] && ISDIGIT (e1[1]) && e2[1] && ISDIGIT (e2[1]))
    {
      ++e1;
      ++e2;
      i1 = strtol (e1, &e1, 10);
      i2 = strtol (e2, &e2, 10);
      if (i1 != i2)
        return i1 - i2;
    }

  if (*e1)
    {
      /* It has a valid numeric extension, prefer this one.  */
      if (*e1 == '.' && e1[1] && ISDIGIT (e1[1]))
        return 1;
      /* It has a invalid numeric extension, must prefer the other one.  */
      else
        return -1;
    }
  else if (*e2)
    {
      /* It has a valid numeric extension, prefer this one.  */
      if (*e2 == '.' && e2[1] && ISDIGIT (e2[1]))
        return -1;
      /* It has a invalid numeric extension, must prefer the other one.  */
      else
        return 1;
    }
  else
    return 0;
}

/* Given the name NAME of a dynamic dependency, find its pathname and add
   it to the list of libraries.  */

static void
locatelib (name)
     char *name;
{
  static char **l;
  static int cnt;
  char buf[MAXPATHLEN];
  char *p, *q;
  char **pp;

  if (l == 0)
    {
      char *ld_rules;
      char *ldr = 0;
      /* counting elements in array, need 1 extra for null */
      cnt = 1;  
      ld_rules = (char *) (ld_2->ld_rules + code);
      if (ld_rules)
        {
          cnt++;
          for (; *ld_rules != 0; ld_rules++)
            if (*ld_rules == ':')
              cnt++;
          ld_rules = (char *) (ld_2->ld_rules + code);
          ldr = (char *) malloc (strlen (ld_rules) + 1);
          strcpy (ldr, ld_rules);
        }
      p = getenv ("LD_LIBRARY_PATH");
      q = 0;
      if (p)
        {
          cnt++;
          for (q = p ; *q != 0; q++)
            if (*q == ':')
              cnt++;
          q = (char *) malloc (strlen (p) + 1);
          strcpy (q, p);
        }
      l = (char **) malloc ((cnt + 3) * sizeof (char *));
      pp = l;
      if (ldr)
        {
          *pp++ = ldr;
          for (; *ldr != 0; ldr++) 
            if (*ldr == ':')
              {
                *ldr++ = 0;
                *pp++ = ldr;
              }
        }
      if (q)
        {
          *pp++ = q;
          for (; *q != 0; q++) 
            if (*q == ':')
              {
                *q++ = 0;
                *pp++ = q;
              }
        }
      /* built in directories are /lib, /usr/lib, and /usr/local/lib */
      *pp++ = "/lib";
      *pp++ = "/usr/lib";
      *pp++ = "/usr/local/lib";
      *pp = 0;
    }
  libname = name;
  for (pp = l; *pp != 0 ; pp++)
    {
      struct direct **namelist;
      int entries;
      if ((entries = scandir (*pp, &namelist, libselect, libcompare)) > 0)
        {
          sprintf (buf, "%s/%s", *pp, namelist[entries - 1]->d_name);
          add_to_list (&libraries, buf);
          if (debug)
            fprintf (stderr, "%s\n", buf);
          break;
        }
    }
  if (*pp == 0)
    {
      if (debug)
        notice ("not found\n");
      else
        fatal ("dynamic dependency %s not found", name);
    }
}

/* Scan the _DYNAMIC structure of the output file to find shared libraries
   that it depends upon and any constructors or destructors they contain.  */

static void 
scan_libraries (prog_name)
     char *prog_name;
{
  struct exec *header;
  char *base;
  struct link_object *lo;
  char buff[MAXPATHLEN];
  struct id *list;

  mapfile (prog_name);
  header = (struct exec *)object;
  if (N_BADMAG (*header))
    fatal ("bad magic number in file '%s'", prog_name);
  if (header->a_dynamic == 0)
    return;

  code = (char *) (N_TXTOFF (*header) + (long) header);
  data = (char *) (N_DATOFF (*header) + (long) header);
  symtab = (struct nlist *) (N_SYMOFF (*header) + (long) header);

  if (header->a_magic == ZMAGIC && header->a_entry == 0x20)
    {
      /* shared object */
      ld = (struct link_dynamic *) (symtab->n_value + code);
      base = code;
    }
  else
    {
      /* executable */
      ld = (struct link_dynamic *) data;
      base = code-PAGSIZ;
    }

  if (debug)
    notice ("dynamic dependencies.\n");

  ld_2 = (struct link_dynamic_2 *) ((long) ld->ld_un.ld_2 + (long)base);
  for (lo = (struct link_object *) ld_2->ld_need; lo;
       lo = (struct link_object *) lo->lo_next)
    {
      char *name;
      lo = (struct link_object *) ((long) lo + code);
      name = (char *) (code + lo->lo_name);
      if (lo->lo_library)
        {
          if (debug)
            fprintf (stderr, "\t-l%s.%d => ", name, lo->lo_major);
          sprintf (buff, "lib%s.so.%d.%d", name, lo->lo_major, lo->lo_minor);
          locatelib (buff);
        }
      else
        {
          if (debug)
            fprintf (stderr, "\t%s\n", name);
          add_to_list (&libraries, name);
        }
    }

  if (debug)
    fprintf (stderr, "\n");

  /* now iterate through the library list adding their symbols to
     the list.  */
  for (list = libraries.first; list; list = list->next)
    scan_prog_file (list->name, PASS_LIB);
}

#else  /* SUNOS4_SHARED_LIBRARIES */
#ifdef LDD_SUFFIX

/* Use the List Dynamic Dependencies program to find shared libraries that
   the output file depends upon and their initialization/finalization
   routines, if any.  */

static void 
scan_libraries (prog_name)
     char *prog_name;
{
  static struct head libraries;         /* list of shared libraries found */
  struct id *list;
  void (*int_handler) ();
  void (*quit_handler) ();
  char *ldd_argv[4];
  int pid;
  int argc = 0;
  int pipe_fd[2];
  char buf[1024];
  FILE *inf;

  /* If we do not have an `ldd', complain.  */
  if (ldd_file_name == 0)
    {
      error ("cannot find `ldd'");
      return;
    }

  ldd_argv[argc++] = ldd_file_name;
  ldd_argv[argc++] = prog_name;
  ldd_argv[argc++] = (char *) 0;

  if (pipe (pipe_fd) < 0)
    fatal_perror ("pipe");

  inf = fdopen (pipe_fd[0], "r");
  if (inf == (FILE *) 0)
    fatal_perror ("fdopen");

  /* Trace if needed.  */
  if (vflag)
    {
      char **p_argv;
      char *str;

      for (p_argv = &ldd_argv[0]; (str = *p_argv) != (char *) 0; p_argv++)
        fprintf (stderr, " %s", str);

      fprintf (stderr, "\n");
    }

  fflush (stdout);
  fflush (stderr);

  /* Spawn child ldd on pipe */
  pid = vfork ();
  if (pid == -1)
    fatal_perror (VFORK_STRING);

  if (pid == 0)                 /* child context */
    {
      /* setup stdout */
      if (dup2 (pipe_fd[1], 1) < 0)
        fatal_perror ("dup2 %d 1", pipe_fd[1]);

      if (close (pipe_fd[0]) < 0)
        fatal_perror ("close %d", pipe_fd[0]);

      if (close (pipe_fd[1]) < 0)
        fatal_perror ("close %d", pipe_fd[1]);

      execv (ldd_file_name, ldd_argv);
      fatal_perror ("execv %s", ldd_file_name);
    }

  /* Parent context from here on.  */
  int_handler  = (void (*) ()) signal (SIGINT,  SIG_IGN);
#ifdef SIGQUIT
  quit_handler = (void (*) ()) signal (SIGQUIT, SIG_IGN);
#endif

  if (close (pipe_fd[1]) < 0)
    fatal_perror ("close %d", pipe_fd[1]);

  if (debug)
    notice ("\nldd output with constructors/destructors.\n");

  /* Read each line of ldd output.  */
  while (fgets (buf, sizeof buf, inf) != (char *) 0)
    {
      int ch, ch2;
      char *name, *end, *p = buf;

      /* Extract names of libraries and add to list.  */
      PARSE_LDD_OUTPUT (p);
      if (p == 0)
        continue;

      name = p;
      if (strncmp (name, "not found", sizeof ("not found") - 1) == 0)
        fatal ("dynamic dependency %s not found", buf);

      /* Find the end of the symbol name.  */
      for (end = p; 
           (ch2 = *end) != '\0' && ch2 != '\n' && !ISSPACE (ch2) && ch2 != '|';
           end++)
        continue;
      *end = '\0';

      if (access (name, R_OK) == 0)
        add_to_list (&libraries, name);
      else
        fatal ("unable to open dynamic dependency '%s'", buf);

      if (debug)
        fprintf (stderr, "\t%s\n", buf);
    }
  if (debug)
    fprintf (stderr, "\n");

  if (fclose (inf) != 0)
    fatal_perror ("fclose");

  do_wait (ldd_file_name);

  signal (SIGINT,  int_handler);
#ifdef SIGQUIT
  signal (SIGQUIT, quit_handler);
#endif

  /* now iterate through the library list adding their symbols to
     the list.  */
  for (list = libraries.first; list; list = list->next)
    scan_prog_file (list->name, PASS_LIB);
}

#endif /* LDD_SUFFIX */
#endif /* SUNOS4_SHARED_LIBRARIES */

#endif /* OBJECT_FORMAT_NONE */

\f
/*
 * COFF specific stuff.
 */

#ifdef OBJECT_FORMAT_COFF

#if defined(EXTENDED_COFF)
#   define GCC_SYMBOLS(X)       (SYMHEADER(X).isymMax + SYMHEADER(X).iextMax)
#   define GCC_SYMENT           SYMR
#   define GCC_OK_SYMBOL(X)     ((X).st == stProc && (X).sc == scText)
#   define GCC_SYMINC(X)        (1)
#   define GCC_SYMZERO(X)       (SYMHEADER(X).isymMax)
#   define GCC_CHECK_HDR(X)     (PSYMTAB(X) != 0)
#else
#   define GCC_SYMBOLS(X)       (HEADER(ldptr).f_nsyms)
#   define GCC_SYMENT           SYMENT
#   define GCC_OK_SYMBOL(X) \
     (((X).n_sclass == C_EXT) && \
      ((X).n_scnum > N_UNDEF) && \
      (((X).n_type & N_TMASK) == (DT_NON << N_BTSHFT) || \
       ((X).n_type & N_TMASK) == (DT_FCN << N_BTSHFT)))
#   define GCC_UNDEF_SYMBOL(X) \
     (((X).n_sclass == C_EXT) && ((X).n_scnum == N_UNDEF))
#   define GCC_SYMINC(X)        ((X).n_numaux+1)
#   define GCC_SYMZERO(X)       0
#   define GCC_CHECK_HDR(X) \
     ((HEADER (X).f_magic == U802TOCMAGIC && ! aix64_flag) \
      || (HEADER (X).f_magic == 0757 && aix64_flag))
#endif

extern char *ldgetname ();

/* COFF version to scan the name list of the loaded program for
   the symbols g++ uses for static constructors and destructors.

   The constructor table begins at __CTOR_LIST__ and contains a count
   of the number of pointers (or -1 if the constructors are built in a
   separate section by the linker), followed by the pointers to the
   constructor functions, terminated with a null pointer.  The
   destructor table has the same format, and begins at __DTOR_LIST__.  */

static void
scan_prog_file (prog_name, which_pass)
     char *prog_name;
     enum pass which_pass;
{
  LDFILE *ldptr = NULL;
  int sym_index, sym_count;
  int is_shared = 0;
#ifdef COLLECT_EXPORT_LIST
  /* Should we generate an import list for given prog_name?  */
  int import_flag = (which_pass == PASS_OBJ ? 0 : use_import_list (prog_name));
#endif

  if (which_pass != PASS_FIRST && which_pass != PASS_OBJ)
    return;

#ifdef COLLECT_EXPORT_LIST
  /* We do not need scanning for some standard C libraries.  */
  if (which_pass == PASS_FIRST && ignore_library (prog_name))
    return;

  /* On AIX we have a loop, because there is not much difference
     between an object and an archive. This trick allows us to
     eliminate scan_libraries() function.  */
  do
    {
#endif
      if ((ldptr = ldopen (prog_name, ldptr)) != NULL)
        {
          if (! MY_ISCOFF (HEADER (ldptr).f_magic))
            fatal ("%s: not a COFF file", prog_name);

          if (GCC_CHECK_HDR (ldptr))
            {
              sym_count = GCC_SYMBOLS (ldptr);
              sym_index = GCC_SYMZERO (ldptr);

#ifdef COLLECT_EXPORT_LIST
              /* Is current archive member a shared object?  */
              is_shared = HEADER (ldptr).f_flags & F_SHROBJ;
#endif

              while (sym_index < sym_count)
                {
                  GCC_SYMENT symbol;

                  if (ldtbread (ldptr, sym_index, &symbol) <= 0)
                    break;
                  sym_index += GCC_SYMINC (symbol);

                  if (GCC_OK_SYMBOL (symbol))
                    {
                      char *name;

                      if ((name = ldgetname (ldptr, &symbol)) == NULL)
                        continue;               /* should never happen */

#ifdef XCOFF_DEBUGGING_INFO
                      /* All AIX function names have a duplicate entry
                         beginning with a dot.  */
                      if (*name == '.')
                        ++name;
#endif

                      switch (is_ctor_dtor (name))
                        {
                        case 1:
                          if (! is_shared) add_to_list (&constructors, name);
#ifdef COLLECT_EXPORT_LIST
                          if (which_pass == PASS_OBJ)
                            add_to_list (&exports, name);
                          /* If this symbol was undefined and we are building
                             an import list, we should add a symbol to this
                             list.  */
                          else
                            if (import_flag
                                && is_in_list (name, undefined.first))
                              add_to_list (&imports, name);
#endif
                          break;

                        case 2:
                          if (! is_shared) add_to_list (&destructors, name);
#ifdef COLLECT_EXPORT_LIST
                          if (which_pass == PASS_OBJ)
                            add_to_list (&exports, name);
                          /* If this symbol was undefined and we are building
                             an import list, we should add a symbol to this
                             list.  */
                          else
                            if (import_flag
                                && is_in_list (name, undefined.first))
                              add_to_list (&imports, name);
#endif
                          break;

#ifdef COLLECT_EXPORT_LIST
                        case 3:
                          if (is_shared)
                            add_to_list (&constructors, name);
                          break;

                        case 4:
                          if (is_shared)
                            add_to_list (&destructors, name);
                          break;
#endif

                        default:        /* not a constructor or destructor */
#ifdef COLLECT_EXPORT_LIST
                          /* If we are building a shared object on AIX we need
                             to explicitly export all global symbols or add
                             them to import list.  */
                          if (shared_obj) 
                            {
                              if (which_pass == PASS_OBJ && (! export_flag))
                                add_to_list (&exports, name);
                              else if (! is_shared && which_pass == PASS_FIRST
                                       && import_flag
                                       && is_in_list(name, undefined.first))
                                add_to_list (&imports, name);
                            }
#endif
                          continue;
                        }

#if !defined(EXTENDED_COFF)
                      if (debug)
                        fprintf (stderr, "\tsec=%d class=%d type=%s%o %s\n",
                                 symbol.n_scnum, symbol.n_sclass,
                                 (symbol.n_type ? "0" : ""), symbol.n_type,
                                 name);
#else
                      if (debug)
                        fprintf (stderr,
                                 "\tiss = %5d, value = %5ld, index = %5d, name = %s\n",
                                 symbol.iss, (long) symbol.value, symbol.index, name);
#endif
                    }
#ifdef COLLECT_EXPORT_LIST
                  /* If we are building a shared object we should collect
                     information about undefined symbols for later
                     import list generation.  */
                  else if (shared_obj && GCC_UNDEF_SYMBOL (symbol))
                    {
                      char *name;

                      if ((name = ldgetname (ldptr, &symbol)) == NULL)
                        continue;               /* should never happen */

                      /* All AIX function names have a duplicate entry
                         beginning with a dot.  */
                      if (*name == '.')
                        ++name;
                      add_to_list (&undefined, name);
                    }
#endif
                }
            }
#ifdef COLLECT_EXPORT_LIST
          else
            {
              /* If archive contains both 32-bit and 64-bit objects,
                 we want to skip objects in other mode so mismatch normal.  */
              if (debug)
                fprintf (stderr, "%s : magic=%o aix64=%d mismatch\n",
                         prog_name, HEADER (ldptr).f_magic, aix64_flag);
            }
#endif
        }
      else
        {
          fatal ("%s: cannot open as COFF file", prog_name);
        }
#ifdef COLLECT_EXPORT_LIST
      /* On AIX loop continues while there are more members in archive.  */
    }
  while (ldclose (ldptr) == FAILURE);
#else
  /* Otherwise we simply close ldptr.  */
  (void) ldclose(ldptr);
#endif
}


#ifdef COLLECT_EXPORT_LIST

/* This new function is used to decide whether we should
   generate import list for an object or to use it directly.  */
static int
use_import_list (prog_name)
     char *prog_name;
{
  char *p;

  /* If we do not build a shared object then import list should not be used.  */
  if (! shared_obj) return 0;

  /* Currently we check only for libgcc, but this can be changed in future.  */
  p = strstr (prog_name, "libgcc.a");
  if (p != 0 && (strlen (p) == sizeof ("libgcc.a") - 1))
    return 1;
  return 0;
}

/* Given a library name without "lib" prefix, this function
   returns a full library name including a path.  */
static char *
resolve_lib_name (name)
     char *name;
{
  char *lib_buf;
  int i, j, l = 0;

  for (i = 0; libpaths[i]; i++)
    if (libpaths[i]->max_len > l)
      l = libpaths[i]->max_len;

  lib_buf = xmalloc (l + strlen(name) + 10);

  for (i = 0; libpaths[i]; i++)
    {
      struct prefix_list *list = libpaths[i]->plist;
      for (; list; list = list->next)
        {
          for (j = 0; libexts[j]; j++)
            {
              /* The following lines are needed because path_prefix list
                 may contain directories both with trailing '/' and
                 without it.  */
              char *p = "";
              if (list->prefix[strlen(list->prefix)-1] != '/')
                p = "/";
              sprintf (lib_buf, "%s%slib%s.%s",
                       list->prefix, p, name, libexts[j]);
if (debug) fprintf (stderr, "searching for: %s\n", lib_buf);
              if (file_exists (lib_buf))
                {
if (debug) fprintf (stderr, "found: %s\n", lib_buf);
                  return (lib_buf);
                }
            }
        }
    }
  if (debug)
    fprintf (stderr, "not found\n");
  else
    fatal ("Library lib%s not found", name);
  return (NULL);
}

/* Array of standard AIX libraries which should not
   be scanned for ctors/dtors.  */
static char* aix_std_libs[] = {
  "/unix",
  "/lib/libc.a",
  "/lib/libc_r.a",
  "/usr/lib/libc.a",
  "/usr/lib/libc_r.a",
  "/usr/lib/threads/libc.a",
  "/usr/ccs/lib/libc.a",
  "/usr/ccs/lib/libc_r.a",
  NULL
};

/* This function checks the filename and returns 1
   if this name matches the location of a standard AIX library. */
static int
ignore_library (name)
     char *name;
{
  char **p = &aix_std_libs[0];
  while (*p++ != NULL)
    if (! strcmp (name, *p)) return 1;
  return 0;
}

#endif

#endif /* OBJECT_FORMAT_COFF */

\f
/*
 * OSF/rose specific stuff.
 */

#ifdef OBJECT_FORMAT_ROSE

/* Union of the various load commands */

typedef union load_union
{
  ldc_header_t                  hdr;    /* common header */
  load_cmd_map_command_t        map;    /* map indexing other load cmds */
  interpreter_command_t         iprtr;  /* interpreter pathname */
  strings_command_t             str;    /* load commands strings section */
  region_command_t              region; /* region load command */
  reloc_command_t               reloc;  /* relocation section */
  package_command_t             pkg;    /* package load command */
  symbols_command_t             sym;    /* symbol sections */
  entry_command_t               ent;    /* program start section */
  gen_info_command_t            info;   /* object information */
  func_table_command_t          func;   /* function constructors/destructors */
} load_union_t;

/* Structure to point to load command and data section in memory.  */

typedef struct load_all
{
  load_union_t *load;                   /* load command */
  char *section;                        /* pointer to section */
} load_all_t;

/* Structure to contain information about a file mapped into memory.  */

struct file_info
{
  char *start;                          /* start of map */
  char *name;                           /* filename */
  long  size;                           /* size of the file */
  long  rounded_size;                   /* size rounded to page boundary */
  int   fd;                             /* file descriptor */
  int   rw;                             /* != 0 if opened read/write */
  int   use_mmap;                       /* != 0 if mmap'ed */
};

extern int decode_mach_o_hdr ();
extern int encode_mach_o_hdr ();

static void add_func_table      PROTO((mo_header_t *, load_all_t *,
                                       symbol_info_t *, int));
static void print_header        PROTO((mo_header_t *));
static void print_load_command  PROTO((load_union_t *, size_t, int));
static void bad_header          PROTO((int));
static struct file_info *read_file  PROTO((char *, int, int));
static void end_file            PROTO((struct file_info *));
\f
/* OSF/rose specific version to scan the name list of the loaded
   program for the symbols g++ uses for static constructors and
   destructors.

   The constructor table begins at __CTOR_LIST__ and contains a count
   of the number of pointers (or -1 if the constructors are built in a
   separate section by the linker), followed by the pointers to the
   constructor functions, terminated with a null pointer.  The
   destructor table has the same format, and begins at __DTOR_LIST__.  */

static void
scan_prog_file (prog_name, which_pass)
     char *prog_name;
     enum pass which_pass;
{
  char *obj;
  mo_header_t hdr;
  load_all_t *load_array;
  load_all_t *load_end;
  load_all_t *load_cmd;
  int symbol_load_cmds;
  off_t offset;
  int i;
  int num_syms;
  int status;
  char *str_sect;
  struct file_info *obj_file;
  int prog_fd;
  mo_lcid_t cmd_strings   = -1;
  symbol_info_t *main_sym = 0;
  int rw                  = (which_pass != PASS_FIRST);

  prog_fd = open (prog_name, (rw) ? O_RDWR : O_RDONLY);
  if (prog_fd < 0)
    fatal_perror ("open %s", prog_name);

  obj_file = read_file (prog_name, prog_fd, rw);
  obj = obj_file->start;

  status = decode_mach_o_hdr (obj, MO_SIZEOF_RAW_HDR, MOH_HEADER_VERSION, &hdr);
  if (status != MO_HDR_CONV_SUCCESS)
    bad_header (status);


  /* Do some basic sanity checks.  Note we explicitly use the big endian magic number,
     since the hardware will automatically swap bytes for us on loading little endian
     integers.  */

#ifndef CROSS_COMPILE
  if (hdr.moh_magic != MOH_MAGIC_MSB
      || hdr.moh_header_version != MOH_HEADER_VERSION
      || hdr.moh_byte_order != OUR_BYTE_ORDER
      || hdr.moh_data_rep_id != OUR_DATA_REP_ID
      || hdr.moh_cpu_type != OUR_CPU_TYPE
      || hdr.moh_cpu_subtype != OUR_CPU_SUBTYPE
      || hdr.moh_vendor_type != OUR_VENDOR_TYPE)
    {
      fatal ("incompatibilities between object file & expected values");
    }
#endif

  if (debug)
    print_header (&hdr);

  offset = hdr.moh_first_cmd_off;
  load_end = load_array
    = (load_all_t *) xcalloc (sizeof (load_all_t), hdr.moh_n_load_cmds + 2);

  /* Build array of load commands, calculating the offsets */
  for (i = 0; i < hdr.moh_n_load_cmds; i++)
    {
      load_union_t *load_hdr;           /* load command header */

      load_cmd = load_end++;
      load_hdr = (load_union_t *) (obj + offset);

      /* If modifying the program file, copy the header.  */
      if (rw)
        {
          load_union_t *ptr = (load_union_t *) xmalloc (load_hdr->hdr.ldci_cmd_size);
          bcopy ((char *)load_hdr, (char *)ptr, load_hdr->hdr.ldci_cmd_size);
          load_hdr = ptr;

          /* null out old command map, because we will rewrite at the end.  */
          if (ptr->hdr.ldci_cmd_type == LDC_CMD_MAP)
            {
              cmd_strings = ptr->map.lcm_ld_cmd_strings;
              ptr->hdr.ldci_cmd_type = LDC_UNDEFINED;
            }
        }

      load_cmd->load = load_hdr;
      if (load_hdr->hdr.ldci_section_off > 0)
        load_cmd->section = obj + load_hdr->hdr.ldci_section_off;

      if (debug)
        print_load_command (load_hdr, offset, i);

      offset += load_hdr->hdr.ldci_cmd_size;
    }

  /* If the last command is the load command map and is not undefined,
     decrement the count of load commands.  */
  if (rw && load_end[-1].load->hdr.ldci_cmd_type == LDC_UNDEFINED)
    {
      load_end--;
      hdr.moh_n_load_cmds--;
    }

  /* Go through and process each symbol table section.  */
  symbol_load_cmds = 0;
  for (load_cmd = load_array; load_cmd < load_end; load_cmd++)
    {
      load_union_t *load_hdr = load_cmd->load;

      if (load_hdr->hdr.ldci_cmd_type == LDC_SYMBOLS)
        {
          symbol_load_cmds++;

          if (debug)
            {
              char *kind = "unknown";

              switch (load_hdr->sym.symc_kind)
                {
                case SYMC_IMPORTS:         kind = "imports"; break;
                case SYMC_DEFINED_SYMBOLS: kind = "defined"; break;
                case SYMC_STABS:           kind = "stabs";   break;
                }

              notice ("\nProcessing symbol table #%d, offset = 0x%.8lx, kind = %s\n",
                      symbol_load_cmds, load_hdr->hdr.ldci_section_off, kind);
            }

          if (load_hdr->sym.symc_kind != SYMC_DEFINED_SYMBOLS)
            continue;

          str_sect = load_array[load_hdr->sym.symc_strings_section].section;
          if (str_sect == (char *) 0)
            fatal ("string section missing");

          if (load_cmd->section == (char *) 0)
            fatal ("section pointer missing");

          num_syms = load_hdr->sym.symc_nentries;
          for (i = 0; i < num_syms; i++)
            {
              symbol_info_t *sym = ((symbol_info_t *) load_cmd->section) + i;
              char *name = sym->si_name.symbol_name + str_sect;

              if (name[0] != '_')
                continue;

              if (rw)
                {
                  char *n = name + strlen (name) - strlen (NAME__MAIN);

                  if ((n - name) < 0 || strcmp (n, NAME__MAIN))
                    continue;
                  while (n != name)
                    if (*--n != '_')
                      continue;

                  main_sym = sym;
                }
              else
                {
                  switch (is_ctor_dtor (name))
                    {
                    case 1:
                      add_to_list (&constructors, name);
                      break;

                    case 2:
                      add_to_list (&destructors, name);
                      break;

                    default:    /* not a constructor or destructor */
                      continue;
                    }
                }

              if (debug)
                fprintf (stderr, "\ttype = 0x%.4x, sc = 0x%.2x, flags = 0x%.8x, name = %.30s\n",
                         sym->si_type, sym->si_sc_type, sym->si_flags, name);
            }
        }
    }

  if (symbol_load_cmds == 0)
    fatal ("no symbol table found");

  /* Update the program file now, rewrite header and load commands.  At present,
     we assume that there is enough space after the last load command to insert
     one more.  Since the first section written out is page aligned, and the
     number of load commands is small, this is ok for the present.  */

  if (rw)
    {
      load_union_t *load_map;
      size_t size;

      if (cmd_strings == -1)
        fatal ("no cmd_strings found");

      /* Add __main to initializer list.
         If we are building a program instead of a shared library, do not
         do anything, since in the current version, you cannot do mallocs
         and such in the constructors.  */

      if (main_sym != (symbol_info_t *) 0
          && ((hdr.moh_flags & MOH_EXECABLE_F) == 0))
        add_func_table (&hdr, load_array, main_sym, FNTC_INITIALIZATION);

      if (debug)
        notice ("\nUpdating header and load commands.\n\n");

      hdr.moh_n_load_cmds++;
      size = sizeof (load_cmd_map_command_t) + (sizeof (mo_offset_t) * (hdr.moh_n_load_cmds - 1));

      /* Create new load command map.  */
      if (debug)
        notice ("load command map, %d cmds, new size %ld.\n",
                (int) hdr.moh_n_load_cmds, (long) size);

      load_map = (load_union_t *) xcalloc (1, size);
      load_map->map.ldc_header.ldci_cmd_type = LDC_CMD_MAP;
      load_map->map.ldc_header.ldci_cmd_size = size;
      load_map->map.lcm_ld_cmd_strings = cmd_strings;
      load_map->map.lcm_nentries = hdr.moh_n_load_cmds;
      load_array[hdr.moh_n_load_cmds-1].load = load_map;

      offset = hdr.moh_first_cmd_off;
      for (i = 0; i < hdr.moh_n_load_cmds; i++)
        {
          load_map->map.lcm_map[i] = offset;
          if (load_array[i].load->hdr.ldci_cmd_type == LDC_CMD_MAP)
            hdr.moh_load_map_cmd_off = offset;

          offset += load_array[i].load->hdr.ldci_cmd_size;
        }

      hdr.moh_sizeofcmds = offset - MO_SIZEOF_RAW_HDR;

      if (debug)
        print_header (&hdr);

      /* Write header */
      status = encode_mach_o_hdr (&hdr, obj, MO_SIZEOF_RAW_HDR);
      if (status != MO_HDR_CONV_SUCCESS)
        bad_header (status);

      if (debug)
        notice ("writing load commands.\n\n");

      /* Write load commands */
      offset = hdr.moh_first_cmd_off;
      for (i = 0; i < hdr.moh_n_load_cmds; i++)
        {
          load_union_t *load_hdr = load_array[i].load;
          size_t size = load_hdr->hdr.ldci_cmd_size;

          if (debug)
            print_load_command (load_hdr, offset, i);

          bcopy ((char *) load_hdr, (char *) (obj + offset), size);
          offset += size;
        }
    }

  end_file (obj_file);

  if (close (prog_fd))
    fatal_perror ("close %s", prog_name);

  if (debug)
    fprintf (stderr, "\n");
}

\f
/* Add a function table to the load commands to call a function
   on initiation or termination of the process.  */

static void
add_func_table (hdr_p, load_array, sym, type)
     mo_header_t *hdr_p;                /* pointer to global header */
     load_all_t *load_array;            /* array of ptrs to load cmds */
     symbol_info_t *sym;                /* pointer to symbol entry */
     int type;                          /* fntc_type value */
{
  /* Add a new load command.  */
  int num_cmds = ++hdr_p->moh_n_load_cmds;
  int load_index = num_cmds - 1;
  size_t size = sizeof (func_table_command_t) + sizeof (mo_addr_t);
  load_union_t *ptr = xcalloc (1, size);
  load_all_t *load_cmd;
  int i;

  /* Set the unresolved address bit in the header to force the loader to be
     used, since kernel exec does not call the initialization functions.  */
  hdr_p->moh_flags |= MOH_UNRESOLVED_F;

  load_cmd = &load_array[load_index];
  load_cmd->load = ptr;
  load_cmd->section = (char *) 0;

  /* Fill in func table load command.  */
  ptr->func.ldc_header.ldci_cmd_type = LDC_FUNC_TABLE;
  ptr->func.ldc_header.ldci_cmd_size = size;
  ptr->func.ldc_header.ldci_section_off = 0;
  ptr->func.ldc_header.ldci_section_len = 0;
  ptr->func.fntc_type = type;
  ptr->func.fntc_nentries = 1;

  /* copy address, turn it from abs. address to (region,offset) if necessary.  */
  /* Is the symbol already expressed as (region, offset)?  */
  if ((sym->si_flags & SI_ABSOLUTE_VALUE_F) == 0)
    {
      ptr->func.fntc_entry_loc[i].adr_lcid = sym->si_value.def_val.adr_lcid;
      ptr->func.fntc_entry_loc[i].adr_sctoff = sym->si_value.def_val.adr_sctoff;
    }

  /* If not, figure out which region it's in.  */
  else
    {
      mo_vm_addr_t addr = sym->si_value.abs_val;
      int found = 0;

      for (i = 0; i < load_index; i++)
        {
          if (load_array[i].load->hdr.ldci_cmd_type == LDC_REGION)
            {
              region_command_t *region_ptr = &load_array[i].load->region;

              if ((region_ptr->regc_flags & REG_ABS_ADDR_F) != 0
                  && addr >= region_ptr->regc_addr.vm_addr
                  && addr <= region_ptr->regc_addr.vm_addr + region_ptr->regc_vm_size)
                {
                  ptr->func.fntc_entry_loc[0].adr_lcid = i;
                  ptr->func.fntc_entry_loc[0].adr_sctoff = addr - region_ptr->regc_addr.vm_addr;
                  found++;
                  break;
                }
            }
        }

      if (!found)
        fatal ("could not convert 0x%l.8x into a region", addr);
    }

  if (debug)
    notice ("%s function, region %d, offset = %ld (0x%.8lx)\n",
            type == FNTC_INITIALIZATION ? "init" : "term",
            (int) ptr->func.fntc_entry_loc[i].adr_lcid,
            (long) ptr->func.fntc_entry_loc[i].adr_sctoff,
            (long) ptr->func.fntc_entry_loc[i].adr_sctoff);

}

\f
/* Print the global header for an OSF/rose object.  */

static void
print_header (hdr_ptr)
     mo_header_t *hdr_ptr;
{
  fprintf (stderr, "\nglobal header:\n");
  fprintf (stderr, "\tmoh_magic            = 0x%.8lx\n", hdr_ptr->moh_magic);
  fprintf (stderr, "\tmoh_major_version    = %d\n", (int)hdr_ptr->moh_major_version);
  fprintf (stderr, "\tmoh_minor_version    = %d\n", (int)hdr_ptr->moh_minor_version);
  fprintf (stderr, "\tmoh_header_version   = %d\n", (int)hdr_ptr->moh_header_version);
  fprintf (stderr, "\tmoh_max_page_size    = %d\n", (int)hdr_ptr->moh_max_page_size);
  fprintf (stderr, "\tmoh_byte_order       = %d\n", (int)hdr_ptr->moh_byte_order);
  fprintf (stderr, "\tmoh_data_rep_id      = %d\n", (int)hdr_ptr->moh_data_rep_id);
  fprintf (stderr, "\tmoh_cpu_type         = %d\n", (int)hdr_ptr->moh_cpu_type);
  fprintf (stderr, "\tmoh_cpu_subtype      = %d\n", (int)hdr_ptr->moh_cpu_subtype);
  fprintf (stderr, "\tmoh_vendor_type      = %d\n", (int)hdr_ptr->moh_vendor_type);
  fprintf (stderr, "\tmoh_load_map_cmd_off = %d\n", (int)hdr_ptr->moh_load_map_cmd_off);
  fprintf (stderr, "\tmoh_first_cmd_off    = %d\n", (int)hdr_ptr->moh_first_cmd_off);
  fprintf (stderr, "\tmoh_sizeofcmds       = %d\n", (int)hdr_ptr->moh_sizeofcmds);
  fprintf (stderr, "\tmon_n_load_cmds      = %d\n", (int)hdr_ptr->moh_n_load_cmds);
  fprintf (stderr, "\tmoh_flags            = 0x%.8lx", (long)hdr_ptr->moh_flags);

  if (hdr_ptr->moh_flags & MOH_RELOCATABLE_F)
    fprintf (stderr, ", relocatable");

  if (hdr_ptr->moh_flags & MOH_LINKABLE_F)
    fprintf (stderr, ", linkable");

  if (hdr_ptr->moh_flags & MOH_EXECABLE_F)
    fprintf (stderr, ", execable");

  if (hdr_ptr->moh_flags & MOH_EXECUTABLE_F)
    fprintf (stderr, ", executable");

  if (hdr_ptr->moh_flags & MOH_UNRESOLVED_F)
    fprintf (stderr, ", unresolved");

  fprintf (stderr, "\n\n");
  return;
}

\f
/* Print a short summary of a load command.  */

static void
print_load_command (load_hdr, offset, number)
     load_union_t *load_hdr;
     size_t offset;
     int number;
{
  mo_long_t type = load_hdr->hdr.ldci_cmd_type;
  char *type_str = (char *) 0;

  switch (type)
    {
    case LDC_UNDEFINED:   type_str = "UNDEFINED";       break;
    case LDC_CMD_MAP:     type_str = "CMD_MAP";         break;
    case LDC_INTERPRETER: type_str = "INTERPRETER";     break;
    case LDC_STRINGS:     type_str = "STRINGS";         break;
    case LDC_REGION:      type_str = "REGION";          break;
    case LDC_RELOC:       type_str = "RELOC";           break;
    case LDC_PACKAGE:     type_str = "PACKAGE";         break;
    case LDC_SYMBOLS:     type_str = "SYMBOLS";         break;
    case LDC_ENTRY:       type_str = "ENTRY";           break;
    case LDC_FUNC_TABLE:  type_str = "FUNC_TABLE";      break;
    case LDC_GEN_INFO:    type_str = "GEN_INFO";        break;
    }

  fprintf (stderr,
           "cmd %2d, sz: 0x%.2lx, coff: 0x%.3lx, doff: 0x%.6lx, dlen: 0x%.6lx",
           number,
           (long) load_hdr->hdr.ldci_cmd_size,
           (long) offset,
           (long) load_hdr->hdr.ldci_section_off,
           (long) load_hdr->hdr.ldci_section_len);

  if (type_str == (char *) 0)
    fprintf (stderr, ", ty: unknown (%ld)\n", (long) type);

  else if (type != LDC_REGION)
    fprintf (stderr, ", ty: %s\n", type_str);

  else
    {
      char *region = "";
      switch (load_hdr->region.regc_usage_type)
        {
        case REG_TEXT_T:        region = ", .text";     break;
        case REG_DATA_T:        region = ", .data";     break;
        case REG_BSS_T:         region = ", .bss";      break;
        case REG_GLUE_T:        region = ", .glue";     break;
#if defined (REG_RDATA_T) && defined (REG_SDATA_T) && defined (REG_SBSS_T) /*mips*/
        case REG_RDATA_T:       region = ", .rdata";    break;
        case REG_SDATA_T:       region = ", .sdata";    break;
        case REG_SBSS_T:        region = ", .sbss";     break;
#endif
        }

      fprintf (stderr, ", ty: %s, vaddr: 0x%.8lx, vlen: 0x%.6lx%s\n",
               type_str,
               (long) load_hdr->region.regc_vm_addr,
               (long) load_hdr->region.regc_vm_size,
               region);
    }

  return;
}

\f
/* Fatal error when {en,de}code_mach_o_header fails.  */

static void
bad_header (status)
     int status;
{
  switch (status)
    {
    case MO_ERROR_BAD_MAGIC:            fatal ("bad magic number");
    case MO_ERROR_BAD_HDR_VERS:         fatal ("bad header version");
    case MO_ERROR_BAD_RAW_HDR_VERS:     fatal ("bad raw header version");
    case MO_ERROR_BUF2SML:              fatal ("raw header buffer too small");
    case MO_ERROR_OLD_RAW_HDR_FILE:     fatal ("old raw header file");
    case MO_ERROR_UNSUPPORTED_VERS:     fatal ("unsupported version");
    default:
      fatal ("unknown {de,en}code_mach_o_hdr return value %d", status);
    }
}

\f
/* Read a file into a memory buffer.  */

static struct file_info *
read_file (name, fd, rw)
     char *name;                /* filename */
     int fd;                    /* file descriptor */
     int rw;                    /* read/write */
{
  struct stat stat_pkt;
  struct file_info *p = (struct file_info *) xcalloc (sizeof (struct file_info), 1);
#ifdef USE_MMAP
  static int page_size;
#endif

  if (fstat (fd, &stat_pkt) < 0)
    fatal_perror ("fstat %s", name);

  p->name         = name;
  p->size         = stat_pkt.st_size;
  p->rounded_size = stat_pkt.st_size;
  p->fd           = fd;
  p->rw           = rw;

#ifdef USE_MMAP
  if (debug)
    fprintf (stderr, "mmap %s, %s\n", name, (rw) ? "read/write" : "read-only");

  if (page_size == 0)
    page_size = sysconf (_SC_PAGE_SIZE);

  p->rounded_size = ((p->size + page_size - 1) / page_size) * page_size;
  p->start = mmap ((caddr_t) 0,
                   (rw) ? p->rounded_size : p->size,
                   (rw) ? (PROT_READ | PROT_WRITE) : PROT_READ,
                   MAP_FILE | MAP_VARIABLE | MAP_SHARED,
                   fd,
                   0L);

  if (p->start != (char *) 0 && p->start != (char *) -1)
    p->use_mmap = 1;

  else
#endif /* USE_MMAP */
    {
      long len;

      if (debug)
        fprintf (stderr, "read %s\n", name);

      p->use_mmap = 0;
      p->start = xmalloc (p->size);
      if (lseek (fd, 0L, SEEK_SET) < 0)
        fatal_perror ("lseek %s 0", name);

      len = read (fd, p->start, p->size);
      if (len < 0)
        fatal_perror ("read %s", name);

      if (len != p->size)
        fatal ("read %ld bytes, expected %ld, from %s", len, p->size, name);
    }

  return p;
}
\f
/* Do anything necessary to write a file back from memory.  */

static void
end_file (ptr)
     struct file_info *ptr;     /* file information block */
{
#ifdef USE_MMAP
  if (ptr->use_mmap)
    {
      if (ptr->rw)
        {
          if (debug)
            fprintf (stderr, "msync %s\n", ptr->name);

          if (msync (ptr->start, ptr->rounded_size, MS_ASYNC))
            fatal_perror ("msync %s", ptr->name);
        }

      if (debug)
        fprintf (stderr, "munmap %s\n", ptr->name);

      if (munmap (ptr->start, ptr->size))
        fatal_perror ("munmap %s", ptr->name);
    }
  else
#endif /* USE_MMAP */
    {
      if (ptr->rw)
        {
          long len;

          if (debug)
            fprintf (stderr, "write %s\n", ptr->name);

          if (lseek (ptr->fd, 0L, SEEK_SET) < 0)
            fatal_perror ("lseek %s 0", ptr->name);

          len = write (ptr->fd, ptr->start, ptr->size);
          if (len < 0)
            fatal_perror ("write %s", ptr->name);

          if (len != ptr->size)
            fatal ("wrote %ld bytes, expected %ld, to %s", len, ptr->size, ptr->name);
        }

      free (ptr->start);
    }

  free (ptr);
}

#endif /* OBJECT_FORMAT_ROSE */