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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]
	       [-y|--output-delaylib 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]
	       [--use-nul-prefixed-import-tables]
	       [-I|--identify library-file-name] [--identify-strict]
	       [-i|--interwork]
	       [-n|--nodelete] [-t|--temp-prefix prefix]
	       [-v|--verbose]
	       [-h|--help] [-V|--version]
	       [--no-leading-underscore] [--leading-underscore]
	       [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 invocation 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 programs will link with in
       order to access the functions in the DLL (an `import library').	This file can be created
       by giving the -l option to dlltool when it is creating or reading in a .def file.

       If the -y option is specified, dlltool generates a delay-import library that can be used
       instead of the normal import library to allow a program to link to the dll only as soon as
       an imported function is called for the first time. The resulting executable will need to
       be linked to the static delayimp library containing __delayLoadHelper2(), which in turn
       will import LoadLibraryA and GetProcAddress from kernel32.

       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

       dlltool may also be used to query an existing import library to determine the name of the
       DLL to which it is associated.  See the description of the -I or --identify option.

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.

       -y filename
       --output-delaylib filename
	   Specifies the name of the delay-import 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 exporting 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 special 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 instructions.

       -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.

       --no-leading-underscore
       --leading-underscore
	   Specifies whether standard symbol should be forced to be prefixed, or not.

       --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 compatibility with certain operating systems.

       --use-nul-prefixed-import-tables
	   Specifies that when dlltool is creating the exports and library files it should prefix
	   the ".idata4" and ".idata5" by zero an element. This emulates old gnu import library
	   generation of "dlltool". By default this option is turned off.

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

       -I filename
       --identify filename
	   Specifies that dlltool should inspect the import library indicated by filename and
	   report, on "stdout", the name(s) of the associated DLL(s).  This can be performed in
	   addition to any other operations indicated by the other options and arguments.
	   dlltool fails if the import library does not exist or is not actually an import
	   library. See also --identify-strict.

       --identify-strict
	   Modifies the behavior of the --identify option, such that an error is reported if
	   filename is associated with more than one DLL.

       -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 character 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, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.

       Permission is granted to copy, distribute and/or modify this document under the terms of
       the GNU Free Documentation License, Version 1.3 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-2.21.53-system 		    2011-12-23				       DLLTOOL(1)
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