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DLLTOOL(1)		     GNU Development Tools		    DLLTOOL(1)

NAME
       dlltool - Create files needed to build and use DLLs.

SYNOPSIS
       dlltool [-d|--input-def def-file-name]
	       [-b|--base-file base-file-name]
	       [-e|--output-exp exports-file-name]
	       [-z|--output-def def-file-name]
	       [-l|--output-lib library-file-name]
	       [--export-all-symbols] [--no-export-all-symbols]
	       [--exclude-symbols list]
	       [--no-default-excludes]
	       [-S|--as path-to-assembler] [-f|--as-flags options]
	       [-D|--dllname name] [-m|--machine machine]
	       [-a|--add-indirect]
	       [-U|--add-underscore] [--add-stdcall-underscore]
	       [-k|--kill-at] [-A|--add-stdcall-alias]
	       [-p|--ext-prefix-alias prefix]
	       [-x|--no-idata4] [-c|--no-idata5] [-i|--interwork]
	       [-n|--nodelete] [-t|--temp-prefix prefix]
	       [-v|--verbose]
	       [-h|--help] [-V|--version]
	       [object-file ...]

DESCRIPTION
       dlltool	reads its inputs, which can come from the -d and -b options as
       well as object files specified on the command line.  It then  processes
       these  inputs  and  if  the  -e	option has been specified it creates a
       exports file.  If the -l option has been specified it creates a library
       file  and  if  the  -z option has been specified it creates a def file.
       Any or all of the -e, -l and -z options can be present in  one  invoca‐
       tion of dlltool.

       When creating a DLL, along with the source for the DLL, it is necessary
       to have three other files.  dlltool can help with the creation of these
       files.

       The  first  file	 is  a	.def  file which specifies which functions are
       exported from the DLL, which functions the  DLL	imports,  and  so  on.
       This  is a text file and can be created by hand, or dlltool can be used
       to create it using the -z option.  In this case dlltool will  scan  the
       object  files specified on its command line looking for those functions
       which have been specially marked as being exported and put entries  for
       them in the .def file it creates.

       In  order  to mark a function as being exported from a DLL, it needs to
       have an -export:<name_of_function> entry in the .drectve section of the
       object file.  This can be done in C by using the asm() operator:

		 asm (".section .drectve");
		 asm (".ascii \"-export:my_func\"");

		 int my_func (void) { ... }

       The  second file needed for DLL creation is an exports file.  This file
       is linked with the object files that make up the body of the DLL and it
       handles the interface between the DLL and the outside world.  This is a
       binary file and it can be created by giving the -e  option  to  dlltool
       when it is creating or reading in a .def file.

       The  third  file	 needed for DLL creation is the library file that pro‐
       grams will link with in order to access the functions in the DLL.  This
       file  can be created by giving the -l option to dlltool when it is cre‐
       ating or reading in a .def file.

       dlltool builds the library file by hand, but it builds the exports file
       by  creating  temporary	files containing assembler statements and then
       assembling these.  The -S command line option can be  used  to  specify
       the  path to the assembler that dlltool will use, and the -f option can
       be used to pass specific flags to that assembler.  The -n can  be  used
       to  prevent  dlltool from deleting these temporary assembler files when
       it is done, and if -n is specified twice then this will prevent dlltool
       from deleting the temporary object files it used to build the library.

       Here  is an example of creating a DLL from a source file dll.c and also
       creating a program (from an object file	called	program.o)  that  uses
       that DLL:

		 gcc -c dll.c
		 dlltool -e exports.o -l dll.lib dll.o
		 gcc dll.o exports.o -o dll.dll
		 gcc program.o dll.lib -o program

OPTIONS
       The command line options have the following meanings:

       -d filename
       --input-def filename
	   Specifies the name of a .def file to be read in and processed.

       -b filename
       --base-file filename
	   Specifies the name of a base file to be read in and processed.  The
	   contents of this file will be added to the  relocation  section  in
	   the exports file generated by dlltool.

       -e filename
       --output-exp filename
	   Specifies the name of the export file to be created by dlltool.

       -z filename
       --output-def filename
	   Specifies the name of the .def file to be created by dlltool.

       -l filename
       --output-lib filename
	   Specifies the name of the library file to be created by dlltool.

       --export-all-symbols
	   Treat all global and weak defined symbols found in the input object
	   files as symbols to be exported.  There is a small list of  symbols
	   which  are  not  exported by default; see the --no-default-excludes
	   option.  You may add to the list of symbols to not export by	 using
	   the --exclude-symbols option.

       --no-export-all-symbols
	   Only	 export	 symbols explicitly listed in an input .def file or in
	   .drectve sections in the input object files.	 This is  the  default
	   behaviour.	 The   .drectve	 sections  are	created	 by  dllexport
	   attributes in the source code.

       --exclude-symbols list
	   Do not export the symbols in list.  This is a list of symbol	 names
	   separated  by  comma	 or colon characters.  The symbol names should
	   not contain a leading underscore.  This  is	only  meaningful  when
	   --export-all-symbols is used.

       --no-default-excludes
	   When --export-all-symbols is used, it will by default avoid export‐
	   ing certain special symbols.	 The current list of symbols to	 avoid
	   exporting  is DllMain@12, DllEntryPoint@0, impure_ptr.  You may use
	   the --no-default-excludes option to go ahead and export these  spe‐
	   cial symbols.  This is only meaningful when --export-all-symbols is
	   used.

       -S path
       --as path
	   Specifies the path, including the filename, of the assembler to  be
	   used to create the exports file.

       -f options
       --as-flags options
	   Specifies  any  specific  command  line options to be passed to the
	   assembler when building the exports file.  This  option  will  work
	   even	 if  the  -S  option  is not used.  This option only takes one
	   argument, and if it occurs more than once on the command line, then
	   later  occurrences  will override earlier occurrences.  So if it is
	   necessary to pass multiple options to the assembler they should  be
	   enclosed in double quotes.

       -D name
       --dll-name name
	   Specifies the name to be stored in the .def file as the name of the
	   DLL when the -e option is used.  If this  option  is	 not  present,
	   then	 the  filename given to the -e option will be used as the name
	   of the DLL.

       -m machine
       -machine machine
	   Specifies the type of machine for which the library file should  be
	   built.   dlltool has a built in default type, depending upon how it
	   was created, but this option can be used to override that.  This is
	   normally  only useful when creating DLLs for an ARM processor, when
	   the contents of the DLL are actually encode	using  Thumb  instruc‐
	   tions.

       -a
       --add-indirect
	   Specifies  that when dlltool is creating the exports file it should
	   add a section which allows the exported functions to be  referenced
	   without using the import library.  Whatever the hell that means!

       -U
       --add-underscore
	   Specifies  that when dlltool is creating the exports file it should
	   prepend an underscore to the names of all exported symbols.

       --add-stdcall-underscore
	   Specifies that when dlltool is creating the exports file it	should
	   prepend  an	underscore to the names of exported stdcall functions.
	   Variable names and non-stdcall function  names  are	not  modified.
	   This	 option is useful when creating GNU-compatible import libs for
	   third party DLLs that were built with MS-Windows tools.

       -k
       --kill-at
	   Specifies that when dlltool is creating the exports file it	should
	   not append the string @ <number>.  These numbers are called ordinal
	   numbers and they represent another way of accessing the function in
	   a DLL, other than by name.

       -A
       --add-stdcall-alias
	   Specifies  that when dlltool is creating the exports file it should
	   add aliases for stdcall symbols without @ <number> in  addition  to
	   the symbols with @ <number>.

       -p
       --ext-prefix-alias prefix
	   Causes  dlltool to create external aliases for all DLL imports with
	   the specified prefix.  The aliases are created  for	both  external
	   and import symbols with no leading underscore.

       -x
       --no-idata4
	   Specifies  that  when  dlltool  is creating the exports and library
	   files it should omit the ".idata4" section.	This is	 for  compati‐
	   bility with certain operating systems.

       -c
       --no-idata5
	   Specifies  that  when  dlltool  is creating the exports and library
	   files it should omit the ".idata5" section.	This is	 for  compati‐
	   bility with certain operating systems.

       -i
       --interwork
	   Specifies  that dlltool should mark the objects in the library file
	   and exports	file  that  it	produces  as  supporting  interworking
	   between ARM and Thumb code.

       -n
       --nodelete
	   Makes  dlltool  preserve  the  temporary assembler files it used to
	   create the exports file.  If this option is repeated	 then  dlltool
	   will also preserve the temporary object files it uses to create the
	   library file.

       -t prefix
       --temp-prefix prefix
	   Makes dlltool use prefix when constructing the names	 of  temporary
	   assembler  and  object  files.  By default, the temp file prefix is
	   generated from the pid.

       -v
       --verbose
	   Make dlltool describe what it is doing.

       -h
       --help
	   Displays a list of command line options and then exits.

       -V
       --version
	   Displays dlltool's version number and then exits.

       @file
	   Read command-line options from file.	 The options read are inserted
	   in  place of the original @file option.  If file does not exist, or
	   cannot be read, then the option will be treated literally, and  not
	   removed.

	   Options  in file are separated by whitespace.  A whitespace charac‐
	   ter may be included in an option by surrounding the	entire	option
	   in  either  single  or  double  quotes.  Any character (including a
	   backslash) may  be  included	 by  prefixing	the  character	to  be
	   included  with a backslash.	The file may itself contain additional
	   @file options; any such options will be processed recursively.

SEE ALSO
       The Info pages for binutils.

COPYRIGHT
       Copyright (c) 1991, 1992, 1993, 1994, 1995,  1996,  1997,  1998,	 1999,
       2000,  2001,  2002,  2003, 2004, 2005, 2006, 2007 Free Software Founda‐
       tion, Inc.

       Permission is granted to copy, distribute and/or modify	this  document
       under  the  terms of the GNU Free Documentation License, Version 1.1 or
       any later version published by the Free Software	 Foundation;  with  no
       Invariant  Sections,  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-2.17.90		  2007-08-06			    DLLTOOL(1)
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