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LIBTOOL(1)							    LIBTOOL(1)

NAME
       libtool - create libraries
       ranlib - add or update the table of contents of archive libraries

SYNOPSIS
       libtool	-static	 -o  output  [ -sacLT ] [ - ] [ -arch_only arch_type ]
       file...	[-filelist listfile[,dirname]]

       libtool -dynamic -o output [ -install_name name ] [ -compatibility_ver‐
       sion  number ] [ -current_version number ] [ link editor flags ] [ -v ]
       [ -noall_load ] [ - ] [	-arch_only  arch_type  ]  file...   [-filelist
       listfile[,dirname]]

       ranlib [ -sactfLT ] [ - ] archive...

DESCRIPTION
       The  libtool command takes the specified input object files and creates
       a library for use with the link editor, ld(1).  The library's  name  is
       specified  by  output  (the argument to the -o flag).  The input object
       files may be in any correct format that contains object files  (``fat''
       files,  archives,  object  files).  Libtool will not put any non-object
       input file into the output library (unlike ranlib, which allows this in
       the archives it operates on).

       When  producing	a  ``fat''  file from objects of the same CPU type and
       differing CPU subtypes, libtool and ranlib create at most  one  library
       for  each  CPU  type,  rather than a separate library in a fat file for
       each of the unique pairings of CPU type and  CPU	 subtype.   Thus,  the
       resulting CPU subtype for each library is the _ALL CPU subtype for that
       CPU type.  This strategy	 strongly  encourages  the  implementor	 of  a
       library	to  create one library that chooses optimum code to run at run
       time, rather than at link time.

       Libtool can create either dynamically  linked  shared  libraries,  with
       -dynamic, or statically linked (archive) libraries, with -static.

DYNAMICALLY LINKED SHARED LIBRARIES
       Dynamically  linked  libraries, unlike statically linked libraries, are
       Mach-O format files and not ar(5)  format  files.   Dynamically	linked
       libraries  have two restrictions: No symbol may be defined in more than
       one object file and no common symbol can be used.  To maximize  sharing
       of  a  dynamically linked shared library the objects should be compiled
       with the -dynamic flag of cc(1) to produce  indirect  undefined	refer‐
       ences  and  position-independent	 code.	 To build a dynamically linked
       library, libtool, runs the link editor, ld(1),  with  -dylib  once  for
       each architecutre present in the input objects and then lipo(1) to cre‐
       ate a fat file if needed.

ARCHIVE (or statically linked) LIBRARIES
       Libtool with -static is intended to  replace  ar(5)  and	 ranlib.   For
       backward	 compatibility, ranlib is still available, and it supports fat
       files.  Ranlib adds or updates the table of contents to each archive so
       it  can	be linked by the link editor, ld(1).  The table of contents is
       an archive member at the beginning of the archive that indicates	 which
       symbols	are defined in which library members.  Because ranlib rewrites
       the archive, sufficient temporary file space must be available  in  the
       file system that contains the current directory.	 Ranlib takes all cor‐
       rect forms of libraries (fat files containing archives, and simple  ar‐
       chives) and updates the table of contents for all archives in the file.
       Ranlib also takes one common incorrect  form  of	 archive,  an  archive
       whose  members  are  fat	 object files, adding or updating the table of
       contents and producing the library in correct form (a fat file contain‐
       ing multiple archives).

       The   archive   member  name  for  a  table  of	contents  begins  with
       ``__.SYMDEF''.  Currently, there are two types  of  table  of  contents
       produced	 by libtool -static and ranlib and understood by the link edi‐
       tor, ld(1).  These are explained below, under the -s and -a options.

OPTIONS
       The following options pertain to libtool only.

       -static
	      Produce a statically linked (archive)  library  from  the	 input
	      files.  This is the default.

       -dynamic
	      Produce  a  dynamically  linked  shared  library	from the input
	      files.

       -install_name name
	      ror a dynamic shared library this specifies the  file  name  the
	      library  will be installed in for programs that use it.  If this
	      is not specified the name specified by the -o output option will
	      be used.

       -compatibility_version number
	      For  a  dynamic  shared library this specifies the compatibility
	      version number of the library.  When a library is used the  com‐
	      patibility  version  is  checked	and  if	 the user's version is
	      greater that the library's version, an error message is  printed
	      and  the using program exits.  The format of number is X[.Y[.Z]]
	      where X must be a positive non-zero number less than or equal to
	      65535,  and  .Y  and .Z are optional and if present must be non-
	      negative numbers less than or equal to  255.   If	 this  is  not
	      specified	 then it has a value of 0 and no checking is done when
	      the library is used.

       -current_version number
	      For dynamic shared library files this specifies the current ver‐
	      sion  number  of the library.  The program using the library can
	      obtain the current version of the	 library  programmatically  to
	      determine exactly which version of the library it is using.  The
	      format of number is X[.Y[.Z]] where X must be  a	positive  non-
	      zero  number  less  than	or  equal  to 65535, and .Y and .Z are
	      optional and if present must be non-negative numbers  less  than
	      or  equal	 to 255.  If this is not specified then it has a value
	      of 0.

       -noall_load
	      For dynamic shared library files this specifies the the  default
	      behavior	of loading all members of archives on the command line
	      is not to be done.  This option is  used	by  the	 GNU  compiler
	      driver,  cc(1), when used with it's -dynamiclib option.  This is
	      done to allow selective loading of the GNU's compiler's  runtime
	      support library, libcc_dynamic.a .

       link editor flags
	      For  a  dynamic  shared  library	the  following ld(1) flags are
	      accepted and passed through: -lx, -weak-lx,  -search_paths_first
	      -weak_library, -Ldir, -ysym, -usym, -initsym, -idefinition:indi‐
	      rect,  -seg1addr,	 -segs_read_only_addr,	-segs_read_write_addr,
	      -seg_addr_table,	-seg_addr_table_filename, -segprot, -segalign,
	      -sectcreate, -sectorder, -sectorder_detail,  -sectalign,	-unde‐
	      fined,  -read_only_relocs,  -prebind, -prebind_all_twolevel_mod‐
	      ules,  -noprebind,   -framework,	 -weak_framework,   -umbrella,
	      -allowable_client, -sub_umbrella, -sub_library, -F, -U, -Y, -Sn,
	      -Si,  -S,	 -X,  -x,  -whyload,  -all_load.   -arch_errors_fatal,
	      -dylib_file, -run_init_lazily, -final_output, -multiply_defined,
	      -multiply_defined_unused, -twolevel_namespace,  -twolevel_names‐
	      pace_hints,  -flat_namespace, -nomultidefs, -headerpad, -header‐
	      pad_max_install_names,	  -weak_reference_mismatches,	   -M,
	      -no_arch_warnings, -single_module, -multi_module, -exported_sym‐
	      bols_list, -unexported_symbols_list, -m.	See the ld(1) man page
	      for  details  on these flags.  The flag -image_base is a synonym
	      for -seg1addr.

       -v     Verbose mode, which prints the ld(1) commands and	 lipo(1)  com‐
	      mands executed.

       -filelist listfile[,dirname]
	      The listfile contains a list of file names and is an alternative
	      way of specifiying file names on the command  line.    The  file
	      names are listed one per line separated only by newlines (spaces
	      and tabs are assumed to be part  of  the	file  name).   If  the
	      optional	directory  name,  dirname  is  specified  then	it  is
	      prepended to each name in the list file.

       -arch_only arch_type
	      This option causes libtool to build a library only for the spec‐
	      ified arch_type and ignores all other architectures in the input
	      files.  When building a dynamic library, if  this	 is  specified
	      with a specific cpusubtype other than the family cpusubtype then
	      libtool it does not use the ld(1) -force_cpusubtype_ALL flag and
	      passes  the  -arch_only  argument	 to ld(1) as the -arch flag so
	      that the output is tagged with that cpusubtype.

       The following options pertain to the table of contents for  an  archive
       library, and apply to both libtool -static and ranlib:

       -s     Produce  the  preferred type of table of contents, which results
	      in faster link editing when linking with the archive.  The order
	      of  the table of contents is sorted by symbol name.  The library
	      member name of this type of table	 of  contents  is  ``__.SYMDEF
	      SORTED''.	  This	type of table of contents can only be produced
	      when the library does not have multiple members that define  the
	      same symbol.  This is the default.

       -a     Produce  the  original type of table of contents, whose order is
	      based on the order of the members in the archive.	  The  library
	      member  name of this type of table of contents is ``__.SYMDEF''.
	      This type of table of contents must be used when the library has
	      multiple members that define the same symbol.

       -c     Include  common symbols as definitions with respect to the table
	      of contents.  This is seldom the intended behavior  for  linking
	      from  a  library,	 as  it forces the linking of a library member
	      just because it uses an uninitialized global that	 is  undefined
	      at  that	point  in  the	linking.  This option is included only
	      because this was the original behavior of ranlib.	  This	option
	      is not the default.

       -L     Use  the 4.4bsd archive extended format #1, which allows archive
	      member names to be longer than 16 characters and have spaces  in
	      their names.  This option is the default.

       -T     Truncate archive member names to 16 characters and don't use the
	      4.4bsd extended format #1.  This option is not the default.

       -f     Warns when the output archive is fat and ar(1) will no longer be
	      able to operate on it.

       For  compatibility,  the	 following  ranlib  option  is	accepted  (but
       ignored):

       -t     This option used to request that ranlib only ``touch''  the  ar‐
	      chives  instead  of  modifying them.  The option is now ignored,
	      and the table of contents is rebuilt.

       One other option applies to both libtool and ranlib:

       -      Treat all remaining arguments as names of	 files	(or  archives)
	      and not as options.

SEE ALSO
       ld(1), ar(1), otool(1), make(1), redo_prebinding(1), ar(5)

BUGS
       With  the way libraries used to be created, errors were possible if the
       library was modified with ar(1) and  the	 table	of  contents  was  not
       updated	by  rerunning ranlib(1).  Thus the link editor, ld, warns when
       the modification date of a library is more  recent  than	 the  creation
       date  of its table of contents.	Unfortunately, this means that you get
       the warning even if you only copy the library.

Apple Computer, Inc.		 July 11, 2003			    LIBTOOL(1)
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