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ld



SYNOPSIS

       ld [options] objfile ...


DESCRIPTION

       ld  combines  a  number of object and archive files, relo­
       cates their data and ties up  symbol  references.  Usually
       the last step in compiling a program is to run ld.

       ld  accepts  Linker  Command  Language  files written in a
       superset of AT&T's Link Editor Command Language syntax, to
       provide  explicit  and total control over the linking pro­
       cess.

       This man page does not describe the command language;  see
       the  ld entry in "info", or the manual ld: the GNU linker,
       for full details on the  command  language  and  on  other
       aspects of the GNU linker.

       This  version of ld uses the general purpose BFD libraries
       to operate on object files. This allows ld to  read,  com­
       bine,  and  write  object  files  in  many  different for­
       mats---for example, COFF or  "a.out".   Different  formats
       may  be  linked  together to produce any available kind of
       object file.

       Aside from its flexibility, the GNU linker is more helpful
       than  other  linkers  in providing diagnostic information.
       Many linkers abandon execution immediately upon encounter­
       ing  an  error; whenever possible, ld continues executing,
       allowing you to identify other errors (or, in some  cases,
       to get an output file in spite of the error).

       The GNU linker ld is meant to cover a broad range of situ­
       ations, and to be as compatible  as  possible  with  other
       linkers.   As  a  result, you have many choices to control
       its behavior.


OPTIONS

       The linker supports a plethora  of  command-line  options,
       but in actual practice few of them are used in any partic­
       ular context.  For instance, a frequent use of  ld  is  to
       link  standard  Unix object files on a standard, supported
       Unix system.  On such a system, to link a file "hello.o":

               ld -o <output> /lib/crt0.o hello.o -lc

       This tells ld to produce  a  file  called  output  as  the
       result  of  linking  the file "/lib/crt0.o" with "hello.o"
       and the library "libc.a", which will come from  the  stan­
       dard  search  directories.   (See the discussion of the -l
       option below.)

       be mixed in with  command-line  options,  except  that  an
       object  file  argument may not be placed between an option
       and its argument.

       Usually the linker is invoked with  at  least  one  object
       file,  but  you  can  specify  other forms of binary input
       files using -l, -R, and the script command  language.   If
       no  binary  input  files  at all are specified, the linker
       does not produce any output, and  issues  the  message  No
       input files.

       If  the  linker  cannot  recognize the format of an object
       file, it will assume that it is a linker script.  A script
       specified in this way augments the main linker script used
       for the link (either the default linker script or the  one
       specified  by  using -T).  This feature permits the linker
       to link against a file which appears to be an object or an
       archive,  but  actually merely defines some symbol values,
       or uses "INPUT" or "GROUP" to load  other  objects.   Note
       that  specifying  a script in this way merely augments the
       main linker script; use  the  -T  option  to  replace  the
       default linker script entirely.

       For  options whose names are a single letter, option argu­
       ments must either follow the option letter without  inter­
       vening whitespace, or be given as separate arguments imme­
       diately following the option that requires them.

       For options whose names are multiple letters,  either  one
       dash  or  two  can  precede  the option name; for example,
       -trace-symbol   and   --trace-symbol    are    equivalent.
       Note---there is one exception to this rule.  Multiple let­
       ter options that start with a lower case 'o' can  only  be
       preceeded by two dashes.  This is to reduce confusion with
       the -o option.  So for example  -omagic  sets  the  output
       file  name  to magic whereas --omagic sets the NMAGIC flag
       on the output.

       Arguments to multiple-letter options must either be  sepa­
       rated  from the option name by an equals sign, or be given
       as separate arguments  immediately  following  the  option
       that  requires  them.  For example, --trace-symbol foo and
       --trace-symbol=foo are equivalent.   Unique  abbreviations
       of the names of multiple-letter options are accepted.

       Note---if  the  linker  is being invoked indirectly, via a
       compiler driver (e.g. gcc) then  all  the  linker  command
       line  options  should  be prefixed by -Wl, (or whatever is
       appropriate for the particular compiler driver) like this:

                 gcc -Wl,--startgroup foo.o bar.o -Wl,--endgroup


       -Aarchitecture
       --architecture=architecture
           In  the  current  release of ld, this option is useful
           only for the Intel 960 family  of  architectures.   In
           that ld configuration, the architecture argument iden­
           tifies the particular architecture in the 960  family,
           enabling  some  safeguards  and modifying the archive-
           library search path.

           Future releases of ld may support similar  functional­
           ity for other architecture families.

       -b input-format
       --format=input-format
           ld  may be configured to support more than one kind of
           object file.  If your ld is configured this  way,  you
           can use the -b option to specify the binary format for
           input object files that follow this option on the com­
           mand  line.   Even  when  ld  is configured to support
           alternative object formats, you don't usually need  to
           specify  this, as ld should be configured to expect as
           a default input format the most usual format  on  each
           machine.  input-format is a text string, the name of a
           particular format  supported  by  the  BFD  libraries.
           (You  can  list the available binary formats with obj­
           dump -i.)

           You may want to use this option  if  you  are  linking
           files with an unusual binary format.  You can also use
           -b to switch formats explicitly (when  linking  object
           files  of  different  formats), by including -b input-
           format before each group of object files in a particu­
           lar format.

           The default format is taken from the environment vari­
           able "GNUTARGET".

           You can also define the input format  from  a  script,
           using the command "TARGET";

       -c MRI-commandfile
       --mri-script=MRI-commandfile
           For  compatibility  with  linkers  produced by MRI, ld
           accepts  script  files  written   in   an   alternate,
           restricted command language, described in the MRI Com­
           patible Script Files section of GNU ld  documentation.
           Introduce MRI script files with the option -c; use the
           -T option to run linker scripts written  in  the  gen­
           eral-purpose  ld  scripting  language.  If MRI-cmdfile
           does not exist, ld looks for  it  in  the  directories
           specified by any -L options.
           will  try  to parse entry as a number, and use that as
           the entry address (the number will be  interpreted  in
           base  10;  you  may use a leading 0x for base 16, or a
           leading 0 for base 8).

       -E
       --export-dynamic
           When creating a dynamically linked executable, add all
           symbols to the dynamic symbol table.  The dynamic sym­
           bol table is the set of symbols which are visible from
           dynamic objects at run time.

           If  you  do  not  use  this option, the dynamic symbol
           table will normally contain only those  symbols  which
           are referenced by some dynamic object mentioned in the
           link.

           If you use "dlopen" to load  a  dynamic  object  which
           needs to refer back to the symbols defined by the pro­
           gram, rather than some other dynamic object, then  you
           will probably need to use this option when linking the
           program itself.

           You can also use the version script  to  control  what
           symbols should be added to the dynamic symbol table if
           the output format supports it.  See the description of
           --version-script in @ref{VERSION}.

       -EB Link  big-endian  objects.   This  affects the default
           output format.

       -EL Link little-endian objects.  This affects the  default
           output format.

       -f
       --auxiliary name
           When  creating  an ELF shared object, set the internal
           DT_AUXILIARY field to the specified name.  This  tells
           the dynamic linker that the symbol table of the shared
           object should be used as an auxiliary  filter  on  the
           symbol table of the shared object name.

           If  you  later  link  a  program  against  this filter
           object, then, when you run the  program,  the  dynamic
           linker  will  see  the  DT_AUXILIARY  field.   If  the
           dynamic linker resolves any symbols  from  the  filter
           object, it will first check whether there is a defini­
           tion in the shared object name.  If there is  one,  it
           will  be  used instead of the definition in the filter
           object.  The shared object name need not exist.   Thus
           the  shared  object  name  may  be  used to provide an
           alternative implementation of certain functions,  per­

           If you  later  link  a  program  against  this  filter
           object,  then,  when  you run the program, the dynamic
           linker will see  the  DT_FILTER  field.   The  dynamic
           linker  will  resolve  symbols according to the symbol
           table of the filter object as usual, but it will actu­
           ally  link  to  the  definitions  found  in the shared
           object name.  Thus the filter object can  be  used  to
           select  a subset of the symbols provided by the object
           name.

           Some older linkers used the  -F  option  throughout  a
           compilation  toolchain for specifying object-file for­
           mat for both input and output object files.   The  GNU
           linker uses other mechanisms for this purpose: the -b,
           --format, --oformat options, the "TARGET"  command  in
           linker  scripts, and the "GNUTARGET" environment vari­
           able.  The GNU linker will ignore the -F  option  when
           not creating an ELF shared object.

       -fini name
           When creating an ELF executable or shared object, call
           NAME when the executable or shared object is unloaded,
           by setting DT_FINI to the address of the function.  By
           default, the linker uses "_fini" as  the  function  to
           call.

       -g  Ignored.  Provided for compatibility with other tools.

       -Gvalue
       --gpsize=value
           Set the maximum size of objects to be optimized  using
           the  GP register to size.  This is only meaningful for
           object file formats such as MIPS ECOFF which  supports
           putting  large  and  small objects into different sec­
           tions.  This is ignored for other object file formats.

       -hname
       -soname=name
           When  creating  an ELF shared object, set the internal
           DT_SONAME field to the specified name.  When  an  exe­
           cutable  is  linked  with  a shared object which has a
           DT_SONAME field, then when the executable is  run  the
           dynamic  linker will attempt to load the shared object
           specified by the DT_SONAME field rather than the using
           the file name given to the linker.

       -i  Perform an incremental link (same as option -r).

       -init name
           When creating an ELF executable or shared object, call
           NAME when the executable or shared object  is  loaded,
           a  directory  for a library with an extension of ".so"
           before searching for one with an  extension  of  ".a".
           By  convention,  a  ".so" extension indicates a shared
           library.

           The linker will search an archive only  once,  at  the
           location  where  it  is specified on the command line.
           If the archive defines a symbol which was undefined in
           some  object  which appeared before the archive on the
           command line, the linker will include the  appropriate
           file(s)  from the archive.  However, an undefined sym­
           bol in an object appearing later on the  command  line
           will not cause the linker to search the archive again.

           See the -( option for a way to  force  the  linker  to
           search archives multiple times.

           You  may  list  the same archive multiple times on the
           command line.

           This type of archive searching is  standard  for  Unix
           linkers.   However,  if  you are using ld on AIX, note
           that it is different from the  behaviour  of  the  AIX
           linker.

       -Lsearchdir
       --library-path=searchdir
           Add  path  searchdir to the list of paths that ld will
           search for archive libraries and ld  control  scripts.
           You  may  use  this  option  any number of times.  The
           directories are searched in the order  in  which  they
           are specified on the command line.  Directories speci­
           fied on the  command  line  are  searched  before  the
           default  directories.   All -L options apply to all -l
           options, regardless of the order in which the  options
           appear.

           If  searchdir  begins  with  "=", then the "=" will be
           replaced by the sysroot prefix, a path specified  when
           the linker is configured.

           The default set of paths searched (without being spec­
           ified with -L) depends on which emulation mode  ld  is
           using,  and  in  some cases also on how it was config­
           ured.

           The paths can also be specified in a link script  with
           the  "SEARCH_DIR" command.  Directories specified this
           way are searched at the  point  in  which  the  linker
           script appears in the command line.

       -memulation
           following:

           *   Where  object  files  and  symbols are mapped into
               memory.

           *   How common symbols are allocated.

           *   All archive members included in the link,  with  a
               mention  of  the  symbol  which caused the archive
               member to be brought in.

       -n
       --nmagic
           Turn off page alignment of sections, and mark the out­
           put as "NMAGIC" if possible.

       -N
       --omagic
           Set  the  text  and  data  sections to be readable and
           writable.  Also, do not page-align the  data  segment,
           and  disable linking against shared libraries.  If the
           output format supports Unix style magic numbers,  mark
           the output as "OMAGIC".

       --no-omagic
           This  option  negates  most  of  the effects of the -N
           option.  It sets the text section to be read-only, and
           forces  the  data  segment to be page-aligned.  Note -
           this option does not  enable  linking  against  shared
           libraries.  Use -Bdynamic for this.

       -o output
       --output=output
           Use output as the name for the program produced by ld;
           if this option is not specified,  the  name  a.out  is
           used by default.  The script command "OUTPUT" can also
           specify the output file name.

       -O level
           If level is a numeric  values  greater  than  zero  ld
           optimizes  the  output.  This might take significantly
           longer and therefore probably should only  be  enabled
           for the final binary.

       -q
       --emit-relocs
           Leave relocation sections and contents in fully linked
           exececutables.  Post link  analysis  and  optimization
           tools  may  need  this information in order to perform
           correct modifications of executables.  This results in
           larger executables.


           When an input file does not have the  same  format  as
           the  output file, partial linking is only supported if
           that input file  does  not  contain  any  relocations.
           Different  output  formats  can  have further restric­
           tions; for example some "a.out"-based formats  do  not
           support partial linking with input files in other for­
           mats at all.

           This option does the same thing as -i.

       -R filename
       --just-symbols=filename
           Read symbol names and their addresses  from  filename,
           but  do  not  relocate it or include it in the output.
           This allows your output file to refer symbolically  to
           absolute  locations  of  memory  defined in other pro­
           grams.  You may use this option more than once.

           For compatibility with other ELF linkers,  if  the  -R
           option  is followed by a directory name, rather than a
           file name, it is treated as the -rpath option.

       -s
       --strip-all
           Omit all symbol information from the output file.

       -S
       --strip-debug
           Omit debugger symbol information (but not all symbols)
           from the output file.

       -t
       --trace
           Print  the  names  of  the input files as ld processes
           them.

       -T scriptfile
       --script=scriptfile
           Use scriptfile as  the  linker  script.   This  script
           replaces  ld's  default  linker  script  (rather  than
           adding to it), so commandfile must specify  everything
           necessary  to  describe the output file.    If script­
           file does not exist in  the  current  directory,  "ld"
           looks  for it in the directories specified by any pre­
           ceding -L options.  Multiple -T options accumulate.

       -u symbol
       --undefined=symbol
           Force symbol to be entered in the output  file  as  an
           undefined  symbol.  Doing this may, for example, trig­
           ger  linking  of  additional  modules  from   standard

       --unique[=SECTION]
           Creates a separate output section for every input sec­
           tion  matching  SECTION,  or  if the optional wildcard
           SECTION argument is missing, for  every  orphan  input
           section.   An  orphan  section is one not specifically
           mentioned in a linker script.  You may use this option
           multiple  times  on the command line;  It prevents the
           normal merging of input sections with the  same  name,
           overriding  output  section  assignments  in  a linker
           script.

       -v
       --version
       -V  Display the version number for ld.  The -V option also
           lists the supported emulations.

       -x
       --discard-all
           Delete all local symbols.

       -X
       --discard-locals
           Delete all temporary local symbols.  For most targets,
           this is all local symbols whose names begin with L.

       -y symbol
       --trace-symbol=symbol
           Print the name of each linked  file  in  which  symbol
           appears.   This  option  may  be  given  any number of
           times.  On many systems it is necessary to prepend  an
           underscore.

           This  option is useful when you have an undefined sym­
           bol in your link but don't know where the reference is
           coming from.

       -Y path
           Add  path  to  the  default library search path.  This
           option exists for Solaris compatibility.

       -z keyword
           The recognized keywords are "initfirst",  "interpose",
           "loadfltr",  "nodefaultlib",  "nodelete",  "nodlopen",
           "nodump", "now", "origin", "combreloc",  "nocombreloc"
           and "nocopyreloc".  The other keywords are ignored for
           Solaris compatibility. "initfirst" marks the object to
           be  initialized  first  at  runtime  before  any other
           objects.  "interpose" marks the object that its symbol
           table  interposes  before  all symbols but the primary
           executable. "loadfltr" marks the object that its  fil­
           tees be processed immediately at runtime.  "nodefault­

       -( archives -)
       --start-group archives --end-group
           The  archives should be a list of archive files.  They
           may be either explicit file names, or -l options.

           The specified archives are searched  repeatedly  until
           no new undefined references are created.  Normally, an
           archive is searched only once in the order that it  is
           specified  on  the  command line.  If a symbol in that
           archive is  needed  to  resolve  an  undefined  symbol
           referred  to  by  an object in an archive that appears
           later on the command line, the  linker  would  not  be
           able  to  resolve  that  reference.   By  grouping the
           archives, they all be searched  repeatedly  until  all
           possible references are resolved.

           Using  this option has a significant performance cost.
           It is best to use it only when there  are  unavoidable
           circular references between two or more archives.

       --accept-unknown-input-arch
       --no-accept-unknown-input-arch
           Tells the linker to accept input files whose architec­
           ture cannot be recognised.  The assumption is that the
           user  knows what they are doing and deliberately wants
           to link in these unknown input files.   This  was  the
           default  behaviour of the linker, before release 2.14.
           The default behaviour from release 2.14 onwards is  to
           reject     such    input    files,    and    so    the
           --accept-unknown-input-arch option has been  added  to
           restore the old behaviour.

       -assert keyword
           This option is ignored for SunOS compatibility.

       -Bdynamic
       -dy
       -call_shared
           Link against dynamic libraries.  This is only meaning­
           ful on platforms for which shared libraries  are  sup­
           ported.   This  option is normally the default on such
           platforms.  The different variants of this option  are
           for  compatibility  with various systems.  You may use
           this option multiple times on  the  command  line:  it
           affects  library searching for -l options which follow
           it.

       -Bgroup
           Set the "DF_1_GROUP" flag in the "DT_FLAGS_1" entry in
           the  dynamic  section.  This causes the runtime linker
           to handle lookups in this object and its  dependencies
           it.

       -Bsymbolic
           When  creating  a  shared  library, bind references to
           global symbols to the  definition  within  the  shared
           library,  if any.  Normally, it is possible for a pro­
           gram linked against a shared library to  override  the
           definition  within the shared library.  This option is
           only meaningful on ELF platforms which support  shared
           libraries.

       --check-sections
       --no-check-sections
           Asks  the  linker not to check section addresses after
           they have been assigned to see if there any  overlaps.
           Normally the linker will perform this check, and if it
           finds any overlaps it will produce suitable error mes­
           sages.   The  linker  does  know  about, and does make
           allowances for  sections  in  overlays.   The  default
           behaviour  can  be  restored by using the command line
           switch --check-sections.

       --cref
           Output a cross reference table.  If a linker map  file
           is  being  generated,  the  cross  reference  table is
           printed to the map file.  Otherwise, it is printed  on
           the standard output.

           The  format  of  the table is intentionally simple, so
           that it may be easily processed by a script if  neces­
           sary.   The  symbols  are printed out, sorted by name.
           For each symbol, a list of file names  is  given.   If
           the  symbol  is  defined, the first file listed is the
           location of the definition.  The remaining files  con­
           tain references to the symbol.

       --no-define-common
           This  option  inhibits  the assignment of addresses to
           common  symbols.   The  script  command  "INHIBIT_COM­
           MON_ALLOCATION" has the same effect.

           The  --no-define-common  option  allows decoupling the
           decision to assign addresses to  Common  symbols  from
           the  choice  of the output file type; otherwise a non-
           Relocatable output type forces assigning addresses  to
           Common  symbols.  Using --no-define-common allows Com­
           mon symbols that are referenced from a shared  library
           to  be  assigned  addresses  only in the main program.
           This eliminates the  unused  duplicate  space  in  the
           shared  library, and also prevents any possible confu­
           sion over resolving to the wrong duplicate when  there
           are many dynamic modules with specialized search paths
           sign (``=''), and expression.

       --demangle[=style]
       --no-demangle
           These options control whether to demangle symbol names
           in error messages and other output.  When  the  linker
           is  told to demangle, it tries to present symbol names
           in a readable fashion: it strips  leading  underscores
           if  they  are used by the object file format, and con­
           verts C++ mangled  symbol  names  into  user  readable
           names.   Different  compilers  have different mangling
           styles.  The optional demangling style argument can be
           used  to  choose  an  appropriate demangling style for
           your compiler.  The linker will  demangle  by  default
           unless the environment variable COLLECT_NO_DEMANGLE is
           set.  These  options  may  be  used  to  override  the
           default.

       --dynamic-linker file
           Set  the  name  of  the  dynamic linker.  This is only
           meaningful when generating dynamically linked ELF exe­
           cutables.  The default dynamic linker is normally cor­
           rect; don't use this unless  you  know  what  you  are
           doing.

       --embedded-relocs
           This  option  is  only  meaningful  when  linking MIPS
           embedded PIC code,  generated  by  the  -membedded-pic
           option  to  the GNU compiler and assembler.  It causes
           the linker to create a table which may be used at run­
           time  to  relocate  any data which was statically ini­
           tialized to pointer values.  See  the  code  in  test­
           suite/ld-empic for details.

       --fatal-warnings
           Treat all warnings as errors.

       --force-exe-suffix
           Make sure that an output file has a .exe suffix.

           If  a successfully built fully linked output file does
           not have a ".exe" or ".dll" suffix, this option forces
           the  linker to copy the output file to one of the same
           name with a ".exe" suffix. This option is useful  when
           using unmodified Unix makefiles on a Microsoft Windows
           host, since some versions  of  Windows  won't  run  an
           image unless it ends in a ".exe" suffix.

       --no-gc-sections
       --gc-sections
           Enable  garbage  collection  of unused input sections.
           It is ignored on targets  that  do  not  support  this

       -Map mapfile
           Print  a  link  map  to  the  file  mapfile.   See the
           description of the -M option, above.

       --no-keep-memory
           ld normally optimizes for speed over memory  usage  by
           caching  the  symbol  tables of input files in memory.
           This option tells ld to instead  optimize  for  memory
           usage,  by  rereading  the symbol tables as necessary.
           This may be required if ld runs out  of  memory  space
           while linking a large executable.

       --no-undefined
       -z defs
           Normally  when creating a non-symbolic shared library,
           undefined symbols are allowed and left to be  resolved
           by  the  runtime  loader.   This option disallows such
           undefined symbols if they  come  from  regular  object
           files.  The switch --no-allow-shlib-undefined controls
           the behaviour for shared objects being linked into the
           shared library.

       --allow-multiple-definition
       -z muldefs
           Normally  when a symbol is defined multiple times, the
           linker will report a fatal error. These options  allow
           multiple  definitions and the first definition will be
           used.

       --allow-shlib-undefined
       --no-allow-shlib-undefined
           Allow (the default) or disallow undefined  symbols  in
           shared  objects.  The setting of this switch overrides
           --no-undefined where  shared  objects  are  concerned.
           Thus      if     --no-undefined     is     set     but
           --no-allow-shlib-undefined is not, the net result will
           be that undefined symbols in regular object files will
           trigger an error,  but  undefined  symbols  in  shared
           objects will be ignored.

           The reason that --allow-shlib-undefined is the default
           is that the shared object being specified at link time
           may  not  be  the  same  one that is available at load
           time, so the symbols might actually be  resolvable  at
           load  time.   Plus  there  are some systems, (eg BeOS)
           where undefined symbols in shared libraries is  normal
           since  the  kernel patches them at load time to select
           which function is most  appropriate  for  the  current
           architecture. eg. to dynamically select an appropriate
           memset function.  Apparently it  is  also  normal  for
           HPPA shared libraries to have undefined symbols.

           that ensures that the linker errors are inappropriate.

       --no-whole-archive
           Turn off the effect of the --whole-archive option  for
           subsequent archive files.

       --noinhibit-exec
           Retain the executable output file whenever it is still
           usable.  Normally, the linker will not produce an out­
           put  file if it encounters errors during the link pro­
           cess; it exits without writing an output file when  it
           issues any error whatsoever.

       -nostdlib
           Only  search  library directories explicitly specified
           on the command line.  Library directories specified in
           linker  scripts (including linker scripts specified on
           the command line) are ignored.

       --oformat output-format
           ld may be configured to support more than one kind  of
           object  file.   If your ld is configured this way, you
           can use the --oformat option  to  specify  the  binary
           format  for  the  output object file.  Even when ld is
           configured to support alternative object formats,  you
           don't  usually  need  to specify this, as ld should be
           configured to produce as a default output  format  the
           most usual format on each machine.  output-format is a
           text string, the name of a particular format supported
           by  the  BFD  libraries.   (You can list the available
           binary formats with objdump -i.)  The  script  command
           "OUTPUT_FORMAT"  can  also  specify the output format,
           but this option overrides it.

       -pie
       --pic-executable
           Create a position  independent  executable.   This  is
           currently  only  supported on ELF platforms.  Position
           independent  executables   are   similar   to   shared
           libraries  in  that  they are relocated by the dynamic
           linker to the virtual  address  OS  chooses  for  them
           (which  can  varry  between  invocations), like normal
           dynamically linked executables they  can  be  executed
           and  symbols defined in the executable cannot be over­
           ridden by shared libraries.

       -qmagic
           This option is ignored for Linux compatibility.

       -Qy This option is ignored for SVR4 compatibility.

       --relax

           On  platforms  where this is not supported, --relax is
           accepted, but ignored.

       --retain-symbols-file filename
           Retain only the symbols listed in the  file  filename,
           discarding  all  others.   filename  is  simply a flat
           file, with one symbol name per line.  This  option  is
           especially  useful  in  environments (such as VxWorks)
           where a large global symbol table is accumulated grad­
           ually, to conserve run-time memory.

           --retain-symbols-file  does not discard undefined sym­
           bols, or symbols needed for relocations.

           You may only specify --retain-symbols-file once in the
           command line.  It overrides -s and -S.

       -rpath dir
           Add  a  directory  to the runtime library search path.
           This is used  when  linking  an  ELF  executable  with
           shared objects.  All -rpath arguments are concatenated
           and passed to the runtime linker, which uses  them  to
           locate  shared  objects at runtime.  The -rpath option
           is also used when locating shared  objects  which  are
           needed  by  shared  objects explicitly included in the
           link; see the description of the  -rpath-link  option.
           If  -rpath is not used when linking an ELF executable,
           the contents of the environment variable "LD_RUN_PATH"
           will be used if it is defined.

           The  -rpath  option  may  also  be  used on SunOS.  By
           default, on SunOS, the  linker  will  form  a  runtime
           search  patch  out  of all the -L options it is given.
           If a -rpath option is used, the  runtime  search  path
           will  be  formed exclusively using the -rpath options,
           ignoring the -L options.   This  can  be  useful  when
           using  gcc, which adds many -L options which may be on
           NFS mounted filesystems.

           For compatibility with other ELF linkers,  if  the  -R
           option  is followed by a directory name, rather than a
           file name, it is treated as the -rpath option.

       -rpath-link DIR
           When using  ELF  or  SunOS,  one  shared  library  may
           require  another.   This  happens when an "ld -shared"
           link includes a shared library as  one  of  the  input
           files.

           When  the  linker  encounters  such  a dependency when
           doing a  non-shared,  non-relocatable  link,  it  will

           The linker uses the following search paths  to  locate
           required shared libraries.

           1.  Any  directories specified by -rpath-link options.

           2.  Any directories specified by -rpath options.   The
               difference  between -rpath and -rpath-link is that
               directories  specified  by  -rpath   options   are
               included  in  the  executable and used at runtime,
               whereas the -rpath-link option is  only  effective
               at link time. It is for the native linker only.

           3.  On  an  ELF system, if the -rpath and "rpath-link"
               options were not used, search the contents of  the
               environment  variable "LD_RUN_PATH". It is for the
               native linker only.

           4.  On SunOS, if  the  -rpath  option  was  not  used,
               search any directories specified using -L options.

           5.  For a native linker, the contents of the  environ­
               ment variable "LD_LIBRARY_PATH".

           6.  For  a  native  ELF  linker,  the  directories  in
               "DT_RUNPATH" or "DT_RPATH" of a shared library are
               searched  for  shared  libraries needed by it. The
               "DT_RPATH" entries  are  ignored  if  "DT_RUNPATH"
               entries exist.

           7.  The   default   directories,   normally  /lib  and
               /usr/lib.

           8.  For a native linker on an ELF system, if the  file
               /etc/ld.so.conf  exists,  the  list of directories
               found in that file.

           If the required  shared  library  is  not  found,  the
           linker  will  issue  a  warning  and continue with the
           link.

       -shared
       -Bshareable
           Create a shared library.  This is currently only  sup­
           ported  on  ELF, XCOFF and SunOS platforms.  On SunOS,
           the linker will automatically create a shared  library
           if  the  -e option is not used and there are undefined
           symbols in the link.

       --sort-common
           This option tells ld to sort  the  common  symbols  by
           size  when  it  places  them in the appropriate output
           erating huge relocatable files  for  downloading  into
           certain  real  time  kernels with the COFF object file
           format; since COFF cannot represent  more  than  65535
           relocations  in a single section.  Note that this will
           fail to work with object file  formats  which  do  not
           support arbitrary sections.  The linker will not split
           up individual input sections for redistribution, so if
           a  single input section contains more than count relo­
           cations one output  section  will  contain  that  many
           relocations.  count defaults to a value of 32768.

       --stats
           Compute  and display statistics about the operation of
           the linker, such as execution time and memory usage.

       --traditional-format
           For some targets, the output of  ld  is  different  in
           some  ways  from  the  output of some existing linker.
           This switch requests ld to use the traditional  format
           instead.

           For  example,  on SunOS, ld combines duplicate entries
           in the symbol string table.  This can reduce the  size
           of  an  output file with full debugging information by
           over 30 percent.  Unfortunately, the SunOS "dbx"  pro­
           gram  can not read the resulting program ("gdb" has no
           trouble).  The --traditional-format switch tells ld to
           not combine duplicate entries.

       --section-start sectionname=org
           Locate  a  section  in the output file at the absolute
           address given by org.  You may use this option as many
           times  as necessary to locate multiple sections in the
           command line.  org must be a single hexadecimal  inte­
           ger;  for  compatibility  with  other linkers, you may
           omit the leading 0x usually associated with  hexadeci­
           mal  values.   Note:  there  should  be no white space
           between sectionname, the equals sign (``=''), and org.

       -Tbss org
       -Tdata org
       -Ttext org
           Same  as  --section-start,  with  ".bss",  ".data"  or
           ".text" as the sectionname.

       --dll-verbose
       --verbose
           Display the version number for ld and list the  linker
           emulations  supported.   Display which input files can
           and cannot be opened.  Display the linker script being
           used by the linker.

           global  symbols.   Unfortunately, some C libraries use
           this practice, so you may get some warnings about sym­
           bols in the libraries as well as in your programs.

           There  are  three kinds of global symbols, illustrated
           here by C examples:

           int i = 1;
               A definition, which goes in the  initialized  data
               section of the output file.

           extern int i;
               An  undefined  reference,  which does not allocate
               space.  There must be either  a  definition  or  a
               common symbol for the variable somewhere.

           int i;
               A  common symbol.  If there are only (one or more)
               common symbols for a  variable,  it  goes  in  the
               uninitialized  data  area of the output file.  The
               linker merges multiple common symbols for the same
               variable  into  a  single  symbol.  If they are of
               different sizes, it picks the largest  size.   The
               linker  turns  a common symbol into a declaration,
               if there is a definition of the same variable.

           The --warn-common option can  produce  five  kinds  of
           warnings.   Each  warning consists of a pair of lines:
           the first describes the symbol just  encountered,  and
           the  second  describes the previous symbol encountered
           with the same name.  One or both of  the  two  symbols
           will be a common symbol.

           1.  Turning  a common symbol into a reference, because
               there is already a definition for the symbol.

                       <file>(<section>): warning: common of `<symbol>'
                          overridden by definition
                       <file>(<section>): warning: defined here

           2.  Turning a common symbol into a reference,  because
               a  later definition for the symbol is encountered.
               This is the same as the previous case, except that
               the  symbols are encountered in a different order.

                       <file>(<section>): warning: definition of `<symbol>'
                          overriding common
                       <file>(<section>): warning: common is here

           3.  Merging a common symbol with a previous same-sized
               common symbol.

               different order.

                       <file>(<section>): warning: common of `<symbol>'
                          overriding smaller common
                       <file>(<section>): warning: smaller common is here

       --warn-constructors
           Warn  if  any  global  constructors are used.  This is
           only useful for a few object file formats.   For  for­
           mats  like  COFF or ELF, the linker can not detect the
           use of global constructors.

       --warn-multiple-gp
           Warn if multiple global pointer values are required in
           the  output file.  This is only meaningful for certain
           processors, such as  the  Alpha.   Specifically,  some
           processors  put  large-valued  constants  in a special
           section.  A  special  register  (the  global  pointer)
           points  into  the middle of this section, so that con­
           stants can be loaded efficiently via  a  base-register
           relative  addressing  mode.  Since the offset in base-
           register relative mode is fixed and  relatively  small
           (e.g.,  16  bits), this limits the maximum size of the
           constant pool.  Thus, in large programs, it  is  often
           necessary  to  use  multiple  global pointer values in
           order to be able to address  all  possible  constants.
           This  option  causes  a  warning to be issued whenever
           this case occurs.

       --warn-once
           Only warn once for each undefined symbol, rather  than
           once per module which refers to it.

       --warn-section-align
           Warn  if  the  address of an output section is changed
           because of alignment.  Typically, the  alignment  will
           be  set by an input section.  The address will only be
           changed if it not explicitly specified;  that  is,  if
           the  "SECTIONS"  command  does  not  specify  a  start
           address for the section.

       --whole-archive
           For each archive mentioned on the command  line  after
           the  --whole-archive option, include every object file
           in the archive in the link, rather than searching  the
           archive  for  the required object files.  This is nor­
           mally used to turn  an  archive  file  into  a  shared
           library,  forcing  every  object to be included in the
           resulting shared library.  This  option  may  be  used
           more than once.

           Two  notes when using this option from gcc: First, gcc
           function.   The  wrapper  function  should  be  called
           "__wrap_symbol".  If it  wishes  to  call  the  system
           function, it should call "__real_symbol".

           Here is a trivial example:

                   void *
                   __wrap_malloc (int c)
                   {
                     printf ("malloc called with %ld\n", c);
                     return __real_malloc (c);
                   }

           If  you  link  other  code with this file using --wrap
           malloc, then all calls to "malloc" will call the func­
           tion    "__wrap_malloc"    instead.    The   call   to
           "__real_malloc" in "__wrap_malloc" will call the  real
           "malloc" function.

           You  may wish to provide a "__real_malloc" function as
           well, so that links without  the  --wrap  option  will
           succeed.  If you do this, you should not put the defi­
           nition  of  "__real_malloc"  in  the  same   file   as
           "__wrap_malloc";  if you do, the assembler may resolve
           the call before the linker has a chance to wrap it  to
           "malloc".

       --enable-new-dtags
       --disable-new-dtags
           This  linker  can  create the new dynamic tags in ELF.
           But the older ELF systems may not understand them.  If
           you  specify --enable-new-dtags, the dynamic tags will
           be  created  as  needed.   If   you   specify   --dis­
           able-new-dtags,  no  new dynamic tags will be created.
           By default, the new dynamic tags are not created. Note
           that those options are only available for ELF systems.

       The i386 PE linker  supports  the  -shared  option,  which
       causes the output to be a dynamically linked library (DLL)
       instead of a normal executable.  You should name the  out­
       put  "*.dll"  when  you use this option.  In addition, the
       linker fully supports the standard  "*.def"  files,  which
       may be specified on the linker command line like an object
       file (in fact, it should precede archives it exports  sym­
       bols  from, to ensure that they get linked in, just like a
       normal object file).

       In addition to the options common to all targets, the i386
       PE linker support additional command line options that are
       specific to the i386 PE target.  Options that take  values
       may be separated from their values by either a space or an
       equals sign.
           Create a DLL instead of a regular executable.  You may
           also  use  -shared  or  specify a "LIBRARY" in a given
           ".def" file.  [This option is specific to the i386  PE
           targeted port of the linker]

       --enable-stdcall-fixup
       --disable-stdcall-fixup
           If  the link finds a symbol that it cannot resolve, it
           will attempt to do ``fuzzy linking''  by  looking  for
           another defined symbol that differs only in the format
           of the symbol name (cdecl vs stdcall) and will resolve
           that symbol by linking to the match.  For example, the
           undefined symbol "_foo" might be linked to  the  func­
           tion  "_foo@12",  or  the  undefined  symbol "_bar@16"
           might be linked to  the  function  "_bar".   When  the
           linker  does  this, it prints a warning, since it nor­
           mally should have failed to link, but sometimes import
           libraries  generated  from  third-party  dlls may need
           this  feature  to   be   usable.    If   you   specify
           --enable-stdcall-fixup,  this feature is fully enabled
           and warnings are not printed.  If you  specify  --dis­
           able-stdcall-fixup,  this feature is disabled and such
           mismatches are considered to be errors.  [This  option
           is  specific  to  the  i386  PE  targeted  port of the
           linker]

       --export-all-symbols
           If given, all global symbols in the  objects  used  to
           build  a  DLL  will be exported by the DLL.  Note that
           this is the default if there otherwise wouldn't be any
           exported   symbols.    When   symbols  are  explicitly
           exported via DEF  files  or  implicitly  exported  via
           function attributes, the default is to not export any­
           thing else unless this option is given.  Note that the
           symbols  "DllMain@12", "DllEntryPoint@0", "DllMainCRT­
           Startup@12", and "impure_ptr" will  not  be  automati­
           cally  exported.   Also,  symbols  imported from other
           DLLs will not be re-exported, nor will symbols  speci­
           fying  the  DLL's internal layout such as those begin­
           ning with "_head_" or ending with "_iname".  In  addi­
           tion,  no  symbols  from  "libgcc",  "libstd++", "lib­
           mingw32", or "crtX.o" will be exported.  Symbols whose
           names begin with "__rtti_" or "__builtin_" will not be
           exported, to help with C++ DLLs.  Finally, there is an
           extensive  list of cygwin-private symbols that are not
           exported (obviously, this  applies  on  when  building
           DLLs  for cygwin targets).  These cygwin-excludes are:
           "_cygwin_dll_entry@12",       "_cygwin_crt0_common@8",
           "_cygwin_noncygwin_dll_entry@12",            "_fmode",
           "_impure_ptr", "cygwin_attach_dll", "cygwin_premain0",
           "cygwin_premain1",   "cygwin_premain2",   "cygwin_pre­
           main3", and "environ".  [This option  is  specific  to
           explicitly  listed  in a .def file are still exported,
           regardless of this option.  [This option  is  specific
           to the i386 PE targeted port of the linker]

       --file-alignment
           Specify the file alignment.  Sections in the file will
           always begin at file offsets which  are  multiples  of
           this  number.   This defaults to 512.  [This option is
           specific to the i386 PE targeted port of the linker]

       --heap reserve
       --heap reserve,commit
           Specify the amount of memory to reserve  (and  option­
           ally commit) to be used as heap for this program.  The
           default is 1Mb reserved, 4K committed.   [This  option
           is  specific  to  the  i386  PE  targeted  port of the
           linker]

       --image-base value
           Use value as the base address of your program or  dll.
           This  is  the lowest memory location that will be used
           when your program or dll is  loaded.   To  reduce  the
           need to relocate and improve performance of your dlls,
           each should have a unique base address and not overlap
           any  other dlls.  The default is 0x400000 for executa­
           bles, and 0x10000000 for dlls.  [This option  is  spe­
           cific to the i386 PE targeted port of the linker]

       --kill-at
           If  given, the stdcall suffixes (@nn) will be stripped
           from symbols before they are exported.   [This  option
           is  specific  to  the  i386  PE  targeted  port of the
           linker]

       --major-image-version value
           Sets  the  major  number  of  the  ``image  version''.
           Defaults  to  1.  [This option is specific to the i386
           PE targeted port of the linker]

       --major-os-version value
           Sets the major number of the ``os version''.  Defaults
           to  4.   [This  option is specific to the i386 PE tar­
           geted port of the linker]

       --major-subsystem-version value
           Sets the major number of  the  ``subsystem  version''.
           Defaults  to  4.  [This option is specific to the i386
           PE targeted port of the linker]

       --minor-image-version value
           Sets  the  minor  number  of  the  ``image  version''.
           Defaults  to  0.  [This option is specific to the i386
           tain a DEF file corresponding to the DLL the linker is
           generating.  This DEF file  (which  should  be  called
           "*.def")  may be used to create an import library with
           "dlltool" or may be used as a reference  to  automati­
           cally or implicitly exported symbols.  [This option is
           specific to the i386 PE targeted port of the linker]

       --out-implib file
           The linker will create the file file which  will  con­
           tain an import lib corresponding to the DLL the linker
           is generating. This import lib (which should be called
           "*.dll.a" or "*.a" may be used to link clients against
           the generated DLL; this behavior makes it possible  to
           skip  a  separate  "dlltool"  import  library creation
           step.  [This option is specific to the  i386  PE  tar­
           geted port of the linker]

       --enable-auto-image-base
           Automatically  choose  the image base for DLLs, unless
           one is specified using  the  "--image-base"  argument.
           By  using  a hash generated from the dllname to create
           unique image bases for each DLL, in-memory  collisions
           and  relocations which can delay program execution are
           avoided.  [This option is specific to the i386 PE tar­
           geted port of the linker]

       --disable-auto-image-base
           Do not automatically generate a unique image base.  If
           there is no user-specified image base ("--image-base")
           then  use  the platform default.  [This option is spe­
           cific to the i386 PE targeted port of the linker]

       --dll-search-prefix string
           When linking dynamically to a dll  without  an  import
           library,  search for "<string><basename>.dll" in pref­
           erence to "lib<basename>.dll".  This  behavior  allows
           easy  distinction  between  DLLs built for the various
           "subplatforms": native, cygwin, uwin,  pw,  etc.   For
           instance, cygwin DLLs typically use "--dll-search-pre­
           fix=cyg".  [This option is specific  to  the  i386  PE
           targeted port of the linker]

       --enable-auto-import
           Do  sophisticated linking of "_symbol" to "__imp__sym­
           bol" for DATA imports from DLLs, and create the neces­
           sary   thunking   symbols  when  building  the  import
           libraries with those  DATA  exports.   This  generally
           will  'just  work'  --  but sometimes you may see this
           message:

           "variable '<var>' can't be auto-imported. Please  read
           the  documentation for ld's "--enable-auto-import" for
           There are several ways  to  address  this  difficulty,
           regardless of the data type of the exported variable:

           One   way   is  to  use  --enable-runtime-pseudo-reloc
           switch. This leaves the task of  adjusting  references
           in  your  client code for runtime environment, so this
           method works only when runtime  environtment  supports
           this feature.

           A  second  solution is to force one of the 'constants'
           to be a variable -- that is, unknown  and  un-optimiz­
           able  at compile time.  For arrays, there are two pos­
           sibilities: a) make the indexee (the array's  address)
           a  variable,  or  b) make the 'constant' index a vari­
           able.  Thus:

                   extern type extern_array[];
                   extern_array[1] -->
                      { volatile type *t=extern_array; t[1] }

           or

                   extern type extern_array[];
                   extern_array[1] -->
                      { volatile int t=1; extern_array[t] }

           For structs (and most other multiword data types)  the
           only  option is to make the struct itself (or the long
           long, or the ...) variable:

                   extern struct s extern_struct;
                   extern_struct.field -->
                      { volatile struct s *t=&extern_struct; t->field }

           or

                   extern long long extern_ll;
                   extern_ll -->
                     { volatile long long * local_ll=&extern_ll; *local_ll }

           A third method of dealing with this difficulty  is  to
           abandon  'auto-import'  for  the  offending symbol and
           mark it  with  "__declspec(dllimport)".   However,  in
           practice  that requires using compile-time #defines to
           indicate whether you  are  building  a  DLL,  building
           client  code  that  will  link  to  the DLL, or merely
           building/linking to a static library.   In making  the
           choice  between  the  various methods of resolving the
           'direct address with  constant  offset'  problem,  you
           should consider typical real-world usage:

           Original:

           Solution 1:

                   --foo.h
                   extern int arr[];
                   --foo.c
                   #include "foo.h"
                   void main(int argc, char **argv){
                     /* This workaround is for win32 and cygwin; do not "optimize" */
                     volatile int *parr = arr;
                     printf("%d\n",parr[1]);
                   }

           Solution 2:

                   --foo.h
                   /* Note: auto-export is assumed (no __declspec(dllexport)) */
                   #if (defined(_WIN32) || defined(__CYGWIN__)) && \
                     !(defined(FOO_BUILD_DLL) || defined(FOO_STATIC))
                   #define FOO_IMPORT __declspec(dllimport)
                   #else
                   #define FOO_IMPORT
                   #endif
                   extern FOO_IMPORT int arr[];
                   --foo.c
                   #include "foo.h"
                   void main(int argc, char **argv){
                     printf("%d\n",arr[1]);
                   }

           A  fourth way to avoid this problem is to re-code your
           library to use a functional interface  rather  than  a
           data  interface  for  the  offending  variables  (e.g.
           set_foo() and get_foo()  accessor  functions).   [This
           option is specific to the i386 PE targeted port of the
           linker]

       --disable-auto-import
           Do not attempt to do sophisticalted linking of  "_sym­
           bol"  to  "__imp__symbol"  for DATA imports from DLLs.
           [This option is specific to the i386 PE targeted  port
           of the linker]

       --enable-runtime-pseudo-reloc
           If   your   code  contains  expressions  described  in
           --enable-auto-import section, that  is,  DATA  imports
           from DLL with non-zero offset, this switch will create
           a vector of 'runtime pseudo relocations' which can  be
           used  by  runtime  environment to adjust references to
           such data in your client code.  [This option  is  spe­
           cific to the i386 PE targeted port of the linker]

           number.  Defaults to 0x1000.  [This option is specific
           to the i386 PE targeted port of the linker]

       --stack reserve
       --stack reserve,commit
           Specify  the  amount of memory to reserve (and option­
           ally commit) to be used as  stack  for  this  program.
           The  default  is  2Mb  reserved,  4K committed.  [This
           option is specific to the i386 PE targeted port of the
           linker]

       --subsystem which
       --subsystem which:major
       --subsystem which:major.minor
           Specifies  the subsystem under which your program will
           execute.  The legal values  for  which  are  "native",
           "windows", "console", and "posix".  You may optionally
           set the subsystem version also.  [This option is  spe­
           cific to the i386 PE targeted port of the linker]


ENVIRONMENT

       You  can  change  the  behavior of ld with the environment
       variables    "GNUTARGET",    "LDEMULATION"    and    "COL­
       LECT_NO_DEMANGLE".

       "GNUTARGET" determines the input-file object format if you
       don't use -b (or its synonym --format).  Its value  should
       be  one of the BFD names for an input format.  If there is
       no "GNUTARGET" in the environment,  ld  uses  the  natural
       format  of  the target. If "GNUTARGET" is set to "default"
       then BFD attempts to discover the input format by  examin­
       ing  binary  input  files; this method often succeeds, but
       there are potential ambiguities, since there is no  method
       of  ensuring that the magic number used to specify object-
       file formats is unique.  However, the configuration proce­
       dure for BFD on each system places the conventional format
       for that system first in the search-list,  so  ambiguities
       are resolved in favor of convention.

       "LDEMULATION"  determines  the  default  emulation  if you
       don't use the -m option.  The emulation can affect various
       aspects  of  linker  behaviour,  particularly  the default
       linker script.  You can list the available emulations with
       the  --verbose  or  -V  options.   If the -m option is not
       used, and the "LDEMULATION" environment  variable  is  not
       defined, the default emulation depends upon how the linker
       was configured.

       Normally, the linker will default to  demangling  symbols.
       However,  if  "COLLECT_NO_DEMANGLE" is set in the environ­
       ment, then it will  default  to  not  demangling  symbols.
       This  environment variable is used in a similar fashion by
       by the Free Software Foundation; with  no  Invariant  Sec­
       tions,  with  no Front-Cover Texts, and with no Back-Cover
       Texts.  A copy of the license is included in  the  section
       entitled ``GNU Free Documentation License''.

binutils-2.14.90.0.5        2003-09-23                      LD(1)
  

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