/* Parse options for the GNU linker.
   Copyright (C) 1991, 92, 93, 94, 95, 96, 1997 Free Software Foundation, Inc.

This file is part of GLD, the Gnu Linker.

GLD 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.

GLD 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 GLD; see the file COPYING.  If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#include "bfd.h"
#include "sysdep.h"
#include "libiberty.h"
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include "getopt.h"
#include "bfdlink.h"
#include "ld.h"
#include "ldmain.h"
#include "ldmisc.h"
#include "ldexp.h"
#include "ldlang.h"
#include "ldgram.h"
#include "ldlex.h"
#include "ldfile.h"
#include "ldver.h"
#include "ldemul.h"

/* Somewhere above, sys/stat.h got included . . . . */
#if !defined(S_ISDIR) && defined(S_IFDIR)
#define	S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
#endif

/* Omit args to avoid the possibility of clashing with a system header
   that might disagree about consts.  */
unsigned long strtoul ();

static void set_default_dirlist PARAMS ((char *dirlist_ptr));
static void set_section_start PARAMS ((char *sect, char *valstr));
static void help PARAMS ((void));

/* Non-zero if we are processing a --defsym from the command line.  */
int parsing_defsym = 0;

/* Codes used for the long options with no short synonyms.  150 isn't
   special; it's just an arbitrary non-ASCII char value.  */

#define OPTION_ASSERT			150
#define OPTION_CALL_SHARED		(OPTION_ASSERT + 1)
#define OPTION_CREF			(OPTION_CALL_SHARED + 1)
#define OPTION_DEFSYM			(OPTION_CREF + 1)
#define OPTION_DYNAMIC_LINKER		(OPTION_DEFSYM + 1)
#define OPTION_EB			(OPTION_DYNAMIC_LINKER + 1)
#define OPTION_EL			(OPTION_EB + 1)
#define OPTION_EMBEDDED_RELOCS		(OPTION_EL + 1)
#define OPTION_EXPORT_DYNAMIC		(OPTION_EMBEDDED_RELOCS + 1)
#define OPTION_HELP			(OPTION_EXPORT_DYNAMIC + 1)
#define OPTION_IGNORE			(OPTION_HELP + 1)
#define OPTION_MAP			(OPTION_IGNORE + 1)
#define OPTION_NO_KEEP_MEMORY		(OPTION_MAP + 1)
#define OPTION_NOINHIBIT_EXEC		(OPTION_NO_KEEP_MEMORY + 1)
#define OPTION_NON_SHARED		(OPTION_NOINHIBIT_EXEC + 1)
#define OPTION_NO_WHOLE_ARCHIVE		(OPTION_NON_SHARED + 1)
#define OPTION_OFORMAT			(OPTION_NO_WHOLE_ARCHIVE + 1)
#define OPTION_RELAX			(OPTION_OFORMAT + 1)
#define OPTION_RETAIN_SYMBOLS_FILE	(OPTION_RELAX + 1)
#define OPTION_RPATH			(OPTION_RETAIN_SYMBOLS_FILE + 1)
#define OPTION_RPATH_LINK		(OPTION_RPATH + 1)
#define OPTION_SHARED			(OPTION_RPATH_LINK + 1)
#define OPTION_SONAME			(OPTION_SHARED + 1)
#define OPTION_SORT_COMMON		(OPTION_SONAME + 1)
#define OPTION_STATS			(OPTION_SORT_COMMON + 1)
#define OPTION_SYMBOLIC			(OPTION_STATS + 1)
#define OPTION_TBSS			(OPTION_SYMBOLIC + 1)
#define OPTION_TDATA			(OPTION_TBSS + 1)
#define OPTION_TTEXT			(OPTION_TDATA + 1)
#define OPTION_TRADITIONAL_FORMAT	(OPTION_TTEXT + 1)
#define OPTION_UR			(OPTION_TRADITIONAL_FORMAT + 1)
#define OPTION_VERBOSE			(OPTION_UR + 1)
#define OPTION_VERSION			(OPTION_VERBOSE + 1)
#define OPTION_VERSION_SCRIPT		(OPTION_VERSION + 1)
#define OPTION_WARN_COMMON		(OPTION_VERSION_SCRIPT + 1)
#define OPTION_WARN_CONSTRUCTORS	(OPTION_WARN_COMMON + 1)
#define OPTION_WARN_MULTIPLE_GP		(OPTION_WARN_CONSTRUCTORS + 1)
#define OPTION_WARN_ONCE		(OPTION_WARN_MULTIPLE_GP + 1)
#define OPTION_WARN_SECTION_ALIGN	(OPTION_WARN_ONCE + 1)
#define OPTION_SPLIT_BY_RELOC		(OPTION_WARN_SECTION_ALIGN + 1)
#define OPTION_SPLIT_BY_FILE 	    	(OPTION_SPLIT_BY_RELOC + 1)
#define OPTION_WHOLE_ARCHIVE		(OPTION_SPLIT_BY_FILE + 1)
#define OPTION_WRAP			(OPTION_WHOLE_ARCHIVE + 1)
#define OPTION_FORCE_EXE_SUFFIX		(OPTION_WRAP + 1)

/* The long options.  This structure is used for both the option
   parsing and the help text.  */

struct ld_option
{
  /* The long option information.  */
  struct option opt;
  /* The short option with the same meaning ('\0' if none).  */
  char shortopt;
  /* The name of the argument (NULL if none).  */
  const char *arg;
  /* The documentation string.  If this is NULL, this is a synonym for
     the previous option.  */
  const char *doc;
  enum
    {
      /* Use one dash before long option name.  */
      ONE_DASH,
      /* Use two dashes before long option name.  */
      TWO_DASHES,
      /* Don't mention this option in --help output.  */
      NO_HELP
    } control;
};

static const struct ld_option ld_options[] =
{
  { {NULL, required_argument, NULL, '\0'},
      'a', "KEYWORD", "Shared library control for HP/UX compatibility",
      ONE_DASH },
  { {"architecture", required_argument, NULL, 'A'},
      'A', "ARCH", "Set architecture" , TWO_DASHES },
  { {"format", required_argument, NULL, 'b'},
      'b', "TARGET", "Specify target for following input files", TWO_DASHES },
  { {"mri-script", required_argument, NULL, 'c'},
      'c', "FILE", "Read MRI format linker script", TWO_DASHES },
  { {"dc", no_argument, NULL, 'd'},
      'd', NULL, "Force common symbols to be defined", ONE_DASH },
  { {"dp", no_argument, NULL, 'd'},
      '\0', NULL, NULL, ONE_DASH },
  { {"entry", required_argument, NULL, 'e'},
      'e', "ADDRESS", "Set start address", TWO_DASHES },
  { {"export-dynamic", no_argument, NULL, OPTION_EXPORT_DYNAMIC},
      'E', NULL, "Export all dynamic symbols", TWO_DASHES },
  { {"auxiliary", required_argument, NULL, 'f'},
      'f', "SHLIB", "Auxiliary filter for shared object symbol table",
      TWO_DASHES },
  { {"filter", required_argument, NULL, 'F'},
      'F', "SHLIB", "Filter for shared object symbol table", TWO_DASHES },
  { {NULL, no_argument, NULL, '\0'},
      'g', NULL, "Ignored", ONE_DASH },
  { {"gpsize", required_argument, NULL, 'G'},
      'G', "SIZE", "Small data size (if no size, same as --shared)",
      TWO_DASHES },
  { {"soname", required_argument, NULL, OPTION_SONAME},
      'h', "FILENAME", "Set internal name of shared library", ONE_DASH },
  { {"library", required_argument, NULL, 'l'},
      'l', "LIBNAME", "Search for library LIBNAME", TWO_DASHES },
  { {"library-path", required_argument, NULL, 'L'},
      'L', "DIRECTORY", "Add DIRECTORY to library search path", TWO_DASHES },
  { {NULL, required_argument, NULL, '\0'},
      'm', "EMULATION", "Set emulation", ONE_DASH },
  { {"print-map", no_argument, NULL, 'M'},
      'M', NULL, "Print map file on standard output", TWO_DASHES },
  { {"nmagic", no_argument, NULL, 'n'},
      'n', NULL, "Do not page align data", TWO_DASHES },
  { {"omagic", no_argument, NULL, 'N'},
      'N', NULL, "Do not page align data, do not make text readonly",
      TWO_DASHES },
  { {"output", required_argument, NULL, 'o'},
      'o', "FILE", "Set output file name", TWO_DASHES },
  { {NULL, required_argument, NULL, '\0'},
      'O', NULL, "Ignored", ONE_DASH },
  { {"relocateable", no_argument, NULL, 'r'},
      'r', NULL, "Generate relocateable output", TWO_DASHES },
  { {NULL, no_argument, NULL, '\0'},
      'i', NULL, NULL, ONE_DASH },
  { {"just-symbols", required_argument, NULL, 'R'},
      'R', "FILE", "Just link symbols (if directory, same as --rpath)",
      TWO_DASHES },
  { {"strip-all", no_argument, NULL, 's'},
      's', NULL, "Strip all symbols", TWO_DASHES },
  { {"strip-debug", no_argument, NULL, 'S'},
      'S', NULL, "Strip debugging symbols", TWO_DASHES },
  { {"trace", no_argument, NULL, 't'},
      't', NULL, "Trace file opens", TWO_DASHES },
  { {"script", required_argument, NULL, 'T'},
      'T', "FILE", "Read linker script", TWO_DASHES },
  { {"undefined", required_argument, NULL, 'u'},
      'u', "SYMBOL", "Start with undefined reference to SYMBOL", TWO_DASHES },
  { {"version", no_argument, NULL, OPTION_VERSION},
      'v', NULL, "Print version information", TWO_DASHES },
  { {NULL, no_argument, NULL, '\0'},
      'V', NULL, "Print version and emulation information", ONE_DASH },
  { {"discard-all", no_argument, NULL, 'x'},
      'x', NULL, "Discard all local symbols", TWO_DASHES },
  { {"discard-locals", no_argument, NULL, 'X'},
      'X', NULL, "Discard temporary local symbols", TWO_DASHES },
  { {"trace-symbol", required_argument, NULL, 'y'},
      'y', "SYMBOL", "Trace mentions of SYMBOL", TWO_DASHES },
  { {NULL, required_argument, NULL, '\0'},
      'Y', "PATH", "Default search path for Solaris compatibility", ONE_DASH },
  { {NULL, required_argument, NULL, '\0'},
      'z', "KEYWORD", "Ignored for Solaris compatibility", ONE_DASH },
  { {"start-group", no_argument, NULL, '('},
      '(', NULL, "Start a group", TWO_DASHES },
  { {"end-group", no_argument, NULL, ')'},
      ')', NULL, "End a group", TWO_DASHES },
  { {"assert", required_argument, NULL, OPTION_ASSERT},
      '\0', "KEYWORD", "Ignored for SunOS compatibility", ONE_DASH },
  { {"Bdynamic", no_argument, NULL, OPTION_CALL_SHARED},
      '\0', NULL, "Link against shared libraries", ONE_DASH },
  { {"dy", no_argument, NULL, OPTION_CALL_SHARED},
      '\0', NULL, NULL, ONE_DASH },
  { {"call_shared", no_argument, NULL, OPTION_CALL_SHARED},
      '\0', NULL, NULL, ONE_DASH },
  { {"Bstatic", no_argument, NULL, OPTION_NON_SHARED},
      '\0', NULL, "Do not link against shared libraries", ONE_DASH },
  { {"dn", no_argument, NULL, OPTION_NON_SHARED},
      '\0', NULL, NULL, ONE_DASH },
  { {"non_shared", no_argument, NULL, OPTION_NON_SHARED},
      '\0', NULL, NULL, ONE_DASH },
  { {"static", no_argument, NULL, OPTION_NON_SHARED},
      '\0', NULL, NULL, ONE_DASH },
  { {"Bsymbolic", no_argument, NULL, OPTION_SYMBOLIC},
      '\0', NULL, "Bind global references locally", ONE_DASH },
  { {"cref", no_argument, NULL, OPTION_CREF},
      '\0', NULL, "Output cross reference table", TWO_DASHES },
  { {"defsym", required_argument, NULL, OPTION_DEFSYM},
      '\0', "SYMBOL=EXPRESSION", "Define a symbol", TWO_DASHES },
  { {"dynamic-linker", required_argument, NULL, OPTION_DYNAMIC_LINKER},
      '\0', "PROGRAM", "Set the dynamic linker to use", TWO_DASHES },
  { {"EB", no_argument, NULL, OPTION_EB},
      '\0', NULL, "Link big-endian objects", ONE_DASH },
  { {"EL", no_argument, NULL, OPTION_EL},
      '\0', NULL, "Link little-endian objects", ONE_DASH },
  { {"embedded-relocs", no_argument, NULL, OPTION_EMBEDDED_RELOCS},
      '\0', NULL, "Generate embedded relocs", TWO_DASHES},
  { {"force-exe-suffix", no_argument, NULL, OPTION_FORCE_EXE_SUFFIX},
      '\0', NULL, "Force generation of file with .exe suffix", TWO_DASHES},
  { {"help", no_argument, NULL, OPTION_HELP},
      '\0', NULL, "Print option help", TWO_DASHES },
  { {"Map", required_argument, NULL, OPTION_MAP},
      '\0', "FILE", "Write a map file", ONE_DASH },
  { {"no-keep-memory", no_argument, NULL, OPTION_NO_KEEP_MEMORY},
      '\0', NULL, "Use less memory and more disk I/O", TWO_DASHES },
  { {"no-whole-archive", no_argument, NULL, OPTION_NO_WHOLE_ARCHIVE},
      '\0', NULL, "Turn off --whole-archive", TWO_DASHES },
  { {"noinhibit-exec", no_argument, NULL, OPTION_NOINHIBIT_EXEC},
      '\0', NULL, "Create an output file even if errors occur", TWO_DASHES },
  { {"noinhibit_exec", no_argument, NULL, OPTION_NOINHIBIT_EXEC},
      '\0', NULL, NULL, NO_HELP },
  { {"oformat", required_argument, NULL, OPTION_OFORMAT},
      '\0', "TARGET", "Specify target of output file", TWO_DASHES },
  { {"qmagic", no_argument, NULL, OPTION_IGNORE},
      '\0', NULL, "Ignored for Linux compatibility", ONE_DASH },
  { {"Qy", no_argument, NULL, OPTION_IGNORE},
      '\0', NULL, "Ignored for SVR4 compatibility", ONE_DASH },
  { {"relax", no_argument, NULL, OPTION_RELAX},
      '\0', NULL, "Relax branches on certain targets", TWO_DASHES },
  { {"retain-symbols-file", required_argument, NULL,
       OPTION_RETAIN_SYMBOLS_FILE},
      '\0', "FILE", "Keep only symbols listed in FILE", TWO_DASHES },
  { {"rpath", required_argument, NULL, OPTION_RPATH},
      '\0', "PATH", "Set runtime shared library search path", ONE_DASH },
  { {"rpath-link", required_argument, NULL, OPTION_RPATH_LINK},
      '\0', "PATH", "Set link time shared library search path", ONE_DASH },
  { {"shared", no_argument, NULL, OPTION_SHARED},
      '\0', NULL, "Create a shared library", ONE_DASH },
  { {"Bshareable", no_argument, NULL, OPTION_SHARED }, /* FreeBSD.  */
      '\0', NULL, NULL, ONE_DASH },
  { {"sort-common", no_argument, NULL, OPTION_SORT_COMMON},
      '\0', NULL, "Sort common symbols by size", TWO_DASHES },
  { {"sort_common", no_argument, NULL, OPTION_SORT_COMMON},
      '\0', NULL, NULL, NO_HELP },
  { {"split-by-file", no_argument, NULL, OPTION_SPLIT_BY_FILE},
      '\0', NULL, "Split output sections for each file", TWO_DASHES },
  { {"split-by-reloc", required_argument, NULL, OPTION_SPLIT_BY_RELOC},
      '\0', "COUNT", "Split output sections every COUNT relocs", TWO_DASHES },
  { {"stats", no_argument, NULL, OPTION_STATS},
      '\0', NULL, "Print memory usage statistics", TWO_DASHES },
  { {"traditional-format", no_argument, NULL, OPTION_TRADITIONAL_FORMAT},
      '\0', NULL, "Use same format as native linker", TWO_DASHES },
  { {"Tbss", required_argument, NULL, OPTION_TBSS},
      '\0', "ADDRESS", "Set address of .bss section", ONE_DASH },
  { {"Tdata", required_argument, NULL, OPTION_TDATA},
      '\0', "ADDRESS", "Set address of .data section", ONE_DASH },
  { {"Ttext", required_argument, NULL, OPTION_TTEXT},
      '\0', "ADDRESS", "Set address of .text section", ONE_DASH },
  { {"Ur", no_argument, NULL, OPTION_UR},
      '\0', NULL, "Build global constructor/destructor tables", ONE_DASH },
  { {"verbose", no_argument, NULL, OPTION_VERBOSE},
      '\0', NULL, "Output lots of information during link", TWO_DASHES },
  { {"dll-verbose", no_argument, NULL, OPTION_VERBOSE}, /* Linux.  */
      '\0', NULL, NULL, NO_HELP },
  { {"version-script", required_argument, NULL, OPTION_VERSION_SCRIPT },
      '\0', "FILE", "Read version information script", TWO_DASHES },
  { {"warn-common", no_argument, NULL, OPTION_WARN_COMMON},
      '\0', NULL, "Warn about duplicate common symbols", TWO_DASHES },
  { {"warn-constructors", no_argument, NULL, OPTION_WARN_CONSTRUCTORS},
      '\0', NULL, "Warn if global constructors/destructors are seen",
      TWO_DASHES },
  { {"warn-multiple-gp", no_argument, NULL, OPTION_WARN_MULTIPLE_GP},
      '\0', NULL, "Warn if the multiple GP values are used", TWO_DASHES },
  { {"warn-once", no_argument, NULL, OPTION_WARN_ONCE},
      '\0', NULL, "Warn only once per undefined symbol", TWO_DASHES },
  { {"warn-section-align", no_argument, NULL, OPTION_WARN_SECTION_ALIGN},
      '\0', NULL, "Warn if start of section changes due to alignment",
      TWO_DASHES },
  { {"whole-archive", no_argument, NULL, OPTION_WHOLE_ARCHIVE},
      '\0', NULL, "Include all objects from following archives", TWO_DASHES },
  { {"wrap", required_argument, NULL, OPTION_WRAP},
      '\0', "SYMBOL", "Use wrapper functions for SYMBOL", TWO_DASHES }
};

#define OPTION_COUNT (sizeof ld_options / sizeof ld_options[0])

void
parse_args (argc, argv)
     int argc;
     char **argv;
{
  int i, is, il;
  int ingroup = 0;
  char *default_dirlist = NULL;
  char shortopts[OPTION_COUNT * 3 + 2];
  struct option longopts[OPTION_COUNT + 1];

  /* Starting the short option string with '-' is for programs that
     expect options and other ARGV-elements in any order and that care about
     the ordering of the two.  We describe each non-option ARGV-element
     as if it were the argument of an option with character code 1.  */
  shortopts[0] = '-';
  is = 1;
  il = 0;
  for (i = 0; i < OPTION_COUNT; i++)
    {
      if (ld_options[i].shortopt != '\0')
	{
	  shortopts[is] = ld_options[i].shortopt;
	  ++is;
	  if (ld_options[i].opt.has_arg == required_argument
	      || ld_options[i].opt.has_arg == optional_argument)
	    {
	      shortopts[is] = ':';
	      ++is;
	      if (ld_options[i].opt.has_arg == optional_argument)
		{
		  shortopts[is] = ':';
		  ++is;
		}
	    }
	}
      if (ld_options[i].opt.name != NULL)
	{
	  longopts[il] = ld_options[i].opt;
	  ++il;
	}
    }
  shortopts[is] = '\0';
  longopts[il].name = NULL;

  /* The -G option is ambiguous on different platforms.  Sometimes it
     specifies the largest data size to put into the small data
     section.  Sometimes it is equivalent to --shared.  Unfortunately,
     the first form takes an argument, while the second does not.

     We need to permit the --shared form because on some platforms,
     such as Solaris, gcc -shared will pass -G to the linker.

     To permit either usage, we look through the argument list.  If we
     find -G not followed by a number, we change it into --shared.
     This will work for most normal cases.  */
  for (i = 1; i < argc; i++)
    if (strcmp (argv[i], "-G") == 0
	&& (i + 1 >= argc
	    || ! isdigit (argv[i + 1][0])))
      argv[i] = (char *) "--shared";

  while (1)
    {
      /* getopt_long_only is like getopt_long, but '-' as well as '--' can
	 indicate a long option.  */
      int longind;
      int optc;

      if (ldemul_parse_args (argc, argv))
	continue;

      optc = getopt_long_only (argc, argv, shortopts, longopts, &longind);

      if (optc == -1)
	break;
      switch (optc)
	{
	default:
	  xexit (1);
	case 1:			/* File name.  */
	  lang_add_input_file (optarg, lang_input_file_is_file_enum,
			       (char *) NULL);
	  break;

	case OPTION_IGNORE:
	  break;
	case 'a':
	  /* For HP/UX compatibility.  Actually -a shared should mean
             ``use only shared libraries'' but, then, we don't
             currently support shared libraries on HP/UX anyhow.  */
	  if (strcmp (optarg, "archive") == 0)
	    config.dynamic_link = false;
	  else if (strcmp (optarg, "shared") == 0
		   || strcmp (optarg, "default") == 0)
	    config.dynamic_link = true;
	  else
	    einfo ("%P%F: unrecognized -a option `%s'\n", optarg);
	  break;
	case OPTION_ASSERT:
	  /* FIXME: We just ignore these, but we should handle them.  */
	  if (strcmp (optarg, "definitions") == 0)
	    ;
	  else if (strcmp (optarg, "nodefinitions") == 0)
	    ;
	  else if (strcmp (optarg, "nosymbolic") == 0)
	    ;
	  else if (strcmp (optarg, "pure-text") == 0)
	    ;
	  else
	    einfo ("%P%F: unrecognized -assert option `%s'\n", optarg);
	  break;
	case 'A':
	  ldfile_add_arch (optarg);
	  break;
	case 'b':
	  lang_add_target (optarg);
	  break;
	case 'c':
	  ldfile_open_command_file (optarg);
	  parser_input = input_mri_script;
	  yyparse ();
	  break;
	case OPTION_CALL_SHARED:
	  config.dynamic_link = true;
	  break;
	case OPTION_NON_SHARED:
	  config.dynamic_link = false;
	  break;
	case OPTION_CREF:
	  command_line.cref = true;
	  link_info.notice_all = true;
	  break;
	case 'd':
	  command_line.force_common_definition = true;
	  break;
	case OPTION_DEFSYM:
	  lex_string = optarg;
	  lex_redirect (optarg);
	  parser_input = input_defsym;
	  parsing_defsym = 1;
	  yyparse ();
	  parsing_defsym = 0;
	  lex_string = NULL;
	  break;
	case OPTION_DYNAMIC_LINKER:
	  command_line.interpreter = optarg;
	  break;
	case OPTION_EB:
	  command_line.endian = ENDIAN_BIG;
	  break;
	case OPTION_EL:
	  command_line.endian = ENDIAN_LITTLE;
	  break;
	case OPTION_EMBEDDED_RELOCS:
	  command_line.embedded_relocs = true;
	  break;
	case OPTION_EXPORT_DYNAMIC:
	case 'E': /* HP/UX compatibility.  */
	  command_line.export_dynamic = true;
	  break;
	case 'e':
	  lang_add_entry (optarg, true);
	  break;
	case 'f':
	  if (command_line.auxiliary_filters == NULL)
	    {
	      command_line.auxiliary_filters =
		(char **) xmalloc (2 * sizeof (char *));
	      command_line.auxiliary_filters[0] = optarg;
	      command_line.auxiliary_filters[1] = NULL;
	    }
	  else
	    {
	      int c;
	      char **p;

	      c = 0;
	      for (p = command_line.auxiliary_filters; *p != NULL; p++)
		++c;
	      command_line.auxiliary_filters =
		(char **) xrealloc (command_line.auxiliary_filters,
				    (c + 2) * sizeof (char *));
	      command_line.auxiliary_filters[c] = optarg;
	      command_line.auxiliary_filters[c + 1] = NULL;
	    }
	  break;
	case 'F':
	  command_line.filter_shlib = optarg;
	  break;
	case OPTION_FORCE_EXE_SUFFIX:
	  command_line.force_exe_suffix = true;
	  break;
	case 'G':
	  {
	    char *end;
	    g_switch_value = strtoul (optarg, &end, 0);
	    if (*end)
	      einfo ("%P%F: invalid number `%s'\n", optarg);
	  }
	  break;
	case 'g':
	  /* Ignore.  */
	  break;
	case OPTION_HELP:
	  help ();
	  xexit (0);
	  break;
	case 'L':
	  ldfile_add_library_path (optarg, true);
	  break;
	case 'l':
	  lang_add_input_file (optarg, lang_input_file_is_l_enum,
			       (char *) NULL);
	  break;
	case 'M':
	  config.map_filename = "-";
	  break;
	case 'm':
	  /* Ignore.  Was handled in a pre-parse.   */
	  break;
	case OPTION_MAP:
	  config.map_filename = optarg;
	  break;
	case 'N':
	  config.text_read_only = false;
	  config.magic_demand_paged = false;
	  config.dynamic_link = false;
	  break;
	case 'n':
	  config.magic_demand_paged = false;
	  config.dynamic_link = false;
	  break;
	case OPTION_NO_KEEP_MEMORY:
	  link_info.keep_memory = false;
	  break;
	case OPTION_NOINHIBIT_EXEC:
	  force_make_executable = true;
	  break;
	case OPTION_NO_WHOLE_ARCHIVE:
	  whole_archive = false;
	  break;
	case 'O':
	  /* FIXME "-O<non-digits> <value>" used to set the address of
	     section <non-digits>.  Was this for compatibility with
	     something, or can we create a new option to do that
	     (with a syntax similar to -defsym)?
	     getopt can't handle two args to an option without kludges.  */
	  break;
	case 'o':
	  lang_add_output (optarg, 0); 
	  break;
	case OPTION_OFORMAT:
	  lang_add_output_format (optarg, (char *) NULL, (char *) NULL, 0);
	  break;
	case 'i':
	case 'r':
	  link_info.relocateable = true;
	  config.build_constructors = false;
	  config.magic_demand_paged = false;
	  config.text_read_only = false;
	  config.dynamic_link = false;
	  break;
	case 'R':
	  /* The GNU linker traditionally uses -R to mean to include
	     only the symbols from a file.  The Solaris linker uses -R
	     to set the path used by the runtime linker to find
	     libraries.  This is the GNU linker -rpath argument.  We
	     try to support both simultaneously by checking the file
	     named.  If it is a directory, rather than a regular file,
	     we assume -rpath was meant.  */
	  {
	    struct stat s;

	    if (stat (optarg, &s) >= 0
		&& ! S_ISDIR (s.st_mode))
	      {
		lang_add_input_file (optarg,
				     lang_input_file_is_symbols_only_enum,
				     (char *) NULL);
		break;
	      }
	  }
	  /* Fall through.  */
	case OPTION_RPATH:
	  if (command_line.rpath == NULL)
	    command_line.rpath = buystring (optarg);
	  else
	    {
	      char *buf;

	      buf = xmalloc (strlen (command_line.rpath)
			     + strlen (optarg)
			     + 2);
	      sprintf (buf, "%s:%s", command_line.rpath, optarg);
	      free (command_line.rpath);
	      command_line.rpath = buf;
	    }
	  break;
	case OPTION_RPATH_LINK:
	  if (command_line.rpath_link == NULL)
	    command_line.rpath_link = buystring (optarg);
	  else
	    {
	      char *buf;

	      buf = xmalloc (strlen (command_line.rpath_link)
			     + strlen (optarg)
			     + 2);
	      sprintf (buf, "%s:%s", command_line.rpath_link, optarg);
	      free (command_line.rpath_link);
	      command_line.rpath_link = buf;
	    }
	  break;
	case OPTION_RELAX:
	  command_line.relax = true;
	  break;
	case OPTION_RETAIN_SYMBOLS_FILE:
	  add_keepsyms_file (optarg);
	  break;
	case 'S':
	  link_info.strip = strip_debugger;
	  break;
	case 's':
	  link_info.strip = strip_all;
	  break;
	case OPTION_SHARED:
	  link_info.shared = true;
	  break;
	case 'h':		/* Used on Solaris.  */
	case OPTION_SONAME:
	  command_line.soname = optarg;
	  break;
	case OPTION_SORT_COMMON:
	  config.sort_common = true;
	  break;
	case OPTION_STATS:
	  config.stats = true;
	  break;
	case OPTION_SYMBOLIC:
	  link_info.symbolic = true;
	  break;
	case 't':
	  trace_files = true;
	  break;
	case 'T':
	  ldfile_open_command_file (optarg);
	  parser_input = input_script;
	  yyparse ();
	  break;
	case OPTION_TBSS:
	  set_section_start (".bss", optarg);
	  break;
	case OPTION_TDATA:
	  set_section_start (".data", optarg);
	  break;
	case OPTION_TTEXT:
	  set_section_start (".text", optarg);
	  break;
	case OPTION_TRADITIONAL_FORMAT:
	  link_info.traditional_format = true;
	  break;
	case OPTION_UR:
	  link_info.relocateable = true;
	  config.build_constructors = true;
	  config.magic_demand_paged = false;
	  config.text_read_only = false;
	  config.dynamic_link = false;
	  break;
	case 'u':
	  ldlang_add_undef (optarg);
	  break;
	case OPTION_VERBOSE:
	  ldversion (1);
	  version_printed = true;
	  trace_file_tries = true;
	  break;
	case 'v':
	  ldversion (0);
	  version_printed = true;
	  break;
	case 'V':
	  ldversion (1);
	  version_printed = true;
	  break;
	case OPTION_VERSION:
	  /* This output is intended to follow the GNU standards document.  */
	  printf ("GNU ld %s\n", ld_program_version);
	  printf ("Copyright 1997 Free Software Foundation, Inc.\n");
	  printf ("\
This program is free software; you may redistribute it under the terms of\n\
the GNU General Public License.  This program has absolutely no warranty.\n");
	  {
	    ld_emulation_xfer_type **ptr = ld_emulations;
    
	    printf ("  Supported emulations:\n");
	    while (*ptr) 
	      {
		printf ("   %s\n", (*ptr)->emulation_name);
		ptr++;
	      }
	  }
	  xexit (0);
	  break;
	case OPTION_VERSION_SCRIPT:
	  /* This option indicates a small script that only specifies
             version information.  Read it, but don't assume that
             we've seen a linker script.  */
	  {
	    boolean hold_had_script;

	    hold_had_script = had_script;
	    ldfile_open_command_file (optarg);
	    had_script = hold_had_script;
	    parser_input = input_version_script;
	    yyparse ();
	  }
	  break;
	case OPTION_WARN_COMMON:
	  config.warn_common = true;
	  break;
	case OPTION_WARN_CONSTRUCTORS:
	  config.warn_constructors = true;
	  break;
	case OPTION_WARN_MULTIPLE_GP:
	  config.warn_multiple_gp = true;
	  break;
	case OPTION_WARN_ONCE:
	  config.warn_once = true;
	  break;
	case OPTION_WARN_SECTION_ALIGN:
	  config.warn_section_align = true;
	  break;
	case OPTION_WHOLE_ARCHIVE:
	  whole_archive = true;
	  break;
	case OPTION_WRAP:
	  add_wrap (optarg);
	  break;
	case 'X':
	  link_info.discard = discard_l;
	  break;
	case 'x':
	  link_info.discard = discard_all;
	  break;
	case 'Y':
	  if (strncmp (optarg, "P,", 2) == 0)
	    optarg += 2;
	  default_dirlist = xstrdup (optarg);
	  break;
	case 'y':
	  add_ysym (optarg);
	  break;
	case 'z':
	  /* We accept and ignore this option for Solaris
             compatibility.  Actually, on Solaris, optarg is not
             ignored.  Someday we should handle it correctly.  FIXME.  */
	  break;
	case OPTION_SPLIT_BY_RELOC:
	  config.split_by_reloc = atoi (optarg);
	  break; 
	case OPTION_SPLIT_BY_FILE:
	  config.split_by_file = true;
	  break; 
	case '(':
	  if (ingroup)
	    {
	      fprintf (stderr,
		       "%s: may not nest groups (--help for usage)\n",
		       program_name);
	      xexit (1);
	    }
	  lang_enter_group ();
	  ingroup = 1;
	  break;
	case ')':
	  if (! ingroup)
	    {
	      fprintf (stderr,
		       "%s: group ended before it began (--help for usage)\n",
		       program_name);
	      xexit (1);
	    }
	  lang_leave_group ();
	  ingroup = 0;
	  break;

	}
    }

  if (ingroup)
    lang_leave_group ();

  if (default_dirlist != NULL)
    set_default_dirlist (default_dirlist);

}

/* Add the (colon-separated) elements of DIRLIST_PTR to the
   library search path.  */

static void
set_default_dirlist (dirlist_ptr)
     char *dirlist_ptr;
{
  char *p;

  while (1)
    {
      p = strchr (dirlist_ptr, ':');
      if (p != NULL)
	*p = '\0';
      if (*dirlist_ptr != '\0')
	ldfile_add_library_path (dirlist_ptr, true);
      if (p == NULL)
	break;
      dirlist_ptr = p + 1;
    }
}

static void
set_section_start (sect, valstr)
     char *sect, *valstr;
{
  char *end;
  unsigned long val = strtoul (valstr, &end, 16);
  if (*end)
    einfo ("%P%F: invalid hex number `%s'\n", valstr);
  lang_section_start (sect, exp_intop (val));
}

/* Print help messages for the options.  */

static void
help ()
{
  int i;
  const char **targets, **pp;

  printf ("Usage: %s [options] file...\n", program_name);

  printf ("Options:\n");
  for (i = 0; i < OPTION_COUNT; i++)
    {
      if (ld_options[i].doc != NULL)
	{
	  boolean comma;
	  int len;
	  int j;

	  printf ("  ");

	  comma = false;
	  len = 2;

	  j = i;
	  do
	    {
	      if (ld_options[j].shortopt != '\0'
		  && ld_options[j].control != NO_HELP)
		{
		  printf ("%s-%c", comma ? ", " : "", ld_options[j].shortopt);
		  len += (comma ? 2 : 0) + 2;
		  if (ld_options[j].arg != NULL)
		    {
		      if (ld_options[j].opt.has_arg != optional_argument)
			{
			  printf (" ");
			  ++len;
			}
		      printf ("%s", ld_options[j].arg);
		      len += strlen (ld_options[j].arg);
		    }
		  comma = true;
		}
	      ++j;
	    }
	  while (j < OPTION_COUNT && ld_options[j].doc == NULL);

	  j = i;
	  do
	    {
	      if (ld_options[j].opt.name != NULL
		  && ld_options[j].control != NO_HELP)
		{
		  printf ("%s-%s%s",
			  comma ? ", " : "",
			  ld_options[j].control == TWO_DASHES ? "-" : "",
			  ld_options[j].opt.name);
		  len += ((comma ? 2 : 0)
			  + 1
			  + (ld_options[j].control == TWO_DASHES ? 1 : 0)
			  + strlen (ld_options[j].opt.name));
		  if (ld_options[j].arg != NULL)
		    {
		      printf (" %s", ld_options[j].arg);
		      len += 1 + strlen (ld_options[j].arg);
		    }
		  comma = true;
		}
	      ++j;
	    }
	  while (j < OPTION_COUNT && ld_options[j].doc == NULL);

	  if (len >= 30)
	    {
	      printf ("\n");
	      len = 0;
	    }

	  for (; len < 30; len++)
	    putchar (' ');

	  printf ("%s\n", ld_options[i].doc);
	}
    }

  printf ("%s: supported targets:", program_name);
  targets = bfd_target_list ();
  for (pp = targets; *pp != NULL; pp++)
    printf (" %s", *pp);
  free (targets);
  printf ("\n");

  printf ("%s: supported emulations: ", program_name);
  ldemul_list_emulations (stdout);
  printf ("\n");
  printf ("\nReport bugs to bug-gnu-utils@prep.ai.mit.edu\n");
}
