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.\" ========================================================================

.\"

.IX Title "DLLTOOL 1"

.TH DLLTOOL 1 "2009-10-16" "binutils-2.20" "GNU Development Tools"

.\" For nroff, turn off justification.  Always turn off hyphenation; it makes

.\" way too many mistakes in technical documents.

.if n .ad l

.nh

.SH "NAME"

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

.SH "SYNOPSIS"

.IX Header "SYNOPSIS"

dlltool [\fB\-d\fR|\fB\-\-input\-def\fR \fIdef-file-name\fR]

        [\fB\-b\fR|\fB\-\-base\-file\fR \fIbase-file-name\fR]

        [\fB\-e\fR|\fB\-\-output\-exp\fR \fIexports-file-name\fR]

        [\fB\-z\fR|\fB\-\-output\-def\fR \fIdef-file-name\fR]

        [\fB\-l\fR|\fB\-\-output\-lib\fR \fIlibrary-file-name\fR]

        [\fB\-y\fR|\fB\-\-output\-delaylib\fR \fIlibrary-file-name\fR]

        [\fB\-\-export\-all\-symbols\fR] [\fB\-\-no\-export\-all\-symbols\fR]

        [\fB\-\-exclude\-symbols\fR \fIlist\fR]

        [\fB\-\-no\-default\-excludes\fR]

        [\fB\-S\fR|\fB\-\-as\fR \fIpath-to-assembler\fR] [\fB\-f\fR|\fB\-\-as\-flags\fR \fIoptions\fR]

        [\fB\-D\fR|\fB\-\-dllname\fR \fIname\fR] [\fB\-m\fR|\fB\-\-machine\fR \fImachine\fR]

        [\fB\-a\fR|\fB\-\-add\-indirect\fR]

        [\fB\-U\fR|\fB\-\-add\-underscore\fR] [\fB\-\-add\-stdcall\-underscore\fR]

        [\fB\-k\fR|\fB\-\-kill\-at\fR] [\fB\-A\fR|\fB\-\-add\-stdcall\-alias\fR]

        [\fB\-p\fR|\fB\-\-ext\-prefix\-alias\fR \fIprefix\fR]

        [\fB\-x\fR|\fB\-\-no\-idata4\fR] [\fB\-c\fR|\fB\-\-no\-idata5\fR]

        [\fB\-\-use\-nul\-prefixed\-import\-tables\fR]

        [\fB\-I\fR|\fB\-\-identify\fR \fIlibrary-file-name\fR] [\fB\-\-identify\-strict\fR]

        [\fB\-i\fR|\fB\-\-interwork\fR]

        [\fB\-n\fR|\fB\-\-nodelete\fR] [\fB\-t\fR|\fB\-\-temp\-prefix\fR \fIprefix\fR]

        [\fB\-v\fR|\fB\-\-verbose\fR]

        [\fB\-h\fR|\fB\-\-help\fR] [\fB\-V\fR|\fB\-\-version\fR]

        [object\-file ...]

.SH "DESCRIPTION"

.IX Header "DESCRIPTION"

\&\fBdlltool\fR reads its inputs, which can come from the \fB\-d\fR and

\&\fB\-b\fR options as well as object files specified on the command

line.  It then processes these inputs and if the \fB\-e\fR option has

been specified it creates a exports file.  If the \fB\-l\fR option

has been specified it creates a library file and if the \fB\-z\fR option

has been specified it creates a def file.  Any or all of the \fB\-e\fR,

\&\fB\-l\fR and \fB\-z\fR options can be present in one invocation of

dlltool.

.PP

When creating a \s-1DLL\s0, along with the source for the \s-1DLL\s0, it is necessary

to have three other files.  \fBdlltool\fR can help with the creation of

these files.

.PP

The first file is a \fI.def\fR file which specifies which functions are

exported from the \s-1DLL\s0, which functions the \s-1DLL\s0 imports, and so on.  This

is a text file and can be created by hand, or \fBdlltool\fR can be used

to create it using the \fB\-z\fR option.  In this case \fBdlltool\fR

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 \fI.def\fR file it creates.

.PP

In order to mark a function as being exported from a \s-1DLL\s0, it needs to

have an \fB\-export:\fR entry in the \fB.drectve\fR

section of the object file.  This can be done in C by using the

\&\fIasm()\fR operator:

.PP

.Vb 2

\&          asm (".section .drectve");

\&          asm (".ascii \e"\-export:my_func\e"");

\&

\&          int my_func (void) { ... }

.Ve

.PP

The second file needed for \s-1DLL\s0 creation is an exports file.  This file

is linked with the object files that make up the body of the \s-1DLL\s0 and it

handles the interface between the \s-1DLL\s0 and the outside world.  This is a

binary file and it can be created by giving the \fB\-e\fR option to

\&\fBdlltool\fR when it is creating or reading in a \fI.def\fR file.

.PP

The third file needed for \s-1DLL\s0 creation is the library file that programs

will link with in order to access the functions in the \s-1DLL\s0 (an `import

library').  This file can be created by giving the \fB\-l\fR option to

dlltool when it is creating or reading in a \fI.def\fR file.

.PP

If the \fB\-y\fR 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 _\|\fI_delayLoadHelper2()\fR,

which in turn will import LoadLibraryA and GetProcAddress from kernel32.

.PP

\&\fBdlltool\fR builds the library file by hand, but it builds the

exports file by creating temporary files containing assembler statements

and then assembling these.  The \fB\-S\fR command line option can be

used to specify the path to the assembler that dlltool will use,

and the \fB\-f\fR option can be used to pass specific flags to that

assembler.  The \fB\-n\fR can be used to prevent dlltool from deleting

these temporary assembler files when it is done, and if \fB\-n\fR is

specified twice then this will prevent dlltool from deleting the

temporary object files it used to build the library.

.PP

Here is an example of creating a \s-1DLL\s0 from a source file \fBdll.c\fR and

also creating a program (from an object file called \fBprogram.o\fR)

that uses that \s-1DLL:\s0

.PP

.Vb 4

\&          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

.Ve

.PP

\&\fBdlltool\fR may also be used to query an existing import library

to determine the name of the \s-1DLL\s0 to which it is associated.  See the

description of the \fB\-I\fR or \fB\-\-identify\fR option.

.SH "OPTIONS"

.IX Header "OPTIONS"

The command line options have the following meanings:

.IP "\fB\-d\fR \fIfilename\fR" 4

.IX Item "-d filename"

.PD 0

.IP "\fB\-\-input\-def\fR \fIfilename\fR" 4

.IX Item "--input-def filename"

.PD

Specifies the name of a \fI.def\fR file to be read in and processed.

.IP "\fB\-b\fR \fIfilename\fR" 4

.IX Item "-b filename"

.PD 0

.IP "\fB\-\-base\-file\fR \fIfilename\fR" 4

.IX Item "--base-file filename"

.PD

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.

.IP "\fB\-e\fR \fIfilename\fR" 4

.IX Item "-e filename"

.PD 0

.IP "\fB\-\-output\-exp\fR \fIfilename\fR" 4

.IX Item "--output-exp filename"

.PD

Specifies the name of the export file to be created by dlltool.

.IP "\fB\-z\fR \fIfilename\fR" 4

.IX Item "-z filename"

.PD 0

.IP "\fB\-\-output\-def\fR \fIfilename\fR" 4

.IX Item "--output-def filename"

.PD

Specifies the name of the \fI.def\fR file to be created by dlltool.

.IP "\fB\-l\fR \fIfilename\fR" 4

.IX Item "-l filename"

.PD 0

.IP "\fB\-\-output\-lib\fR \fIfilename\fR" 4

.IX Item "--output-lib filename"

.PD

Specifies the name of the library file to be created by dlltool.

.IP "\fB\-y\fR \fIfilename\fR" 4

.IX Item "-y filename"

.PD 0

.IP "\fB\-\-output\-delaylib\fR \fIfilename\fR" 4

.IX Item "--output-delaylib filename"

.PD

Specifies the name of the delay-import library file to be created by dlltool.

.IP "\fB\-\-export\-all\-symbols\fR" 4

.IX Item "--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 \fB\-\-no\-default\-excludes\fR

option.  You may add to the list of symbols to not export by using the

\&\fB\-\-exclude\-symbols\fR option.

.IP "\fB\-\-no\-export\-all\-symbols\fR" 4

.IX Item "--no-export-all-symbols"

Only export symbols explicitly listed in an input \fI.def\fR file or in

\&\fB.drectve\fR sections in the input object files.  This is the default

behaviour.  The \fB.drectve\fR sections are created by \fBdllexport\fR

attributes in the source code.

.IP "\fB\-\-exclude\-symbols\fR \fIlist\fR" 4

.IX Item "--exclude-symbols list"

Do not export the symbols in \fIlist\fR.  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

\&\fB\-\-export\-all\-symbols\fR is used.

.IP "\fB\-\-no\-default\-excludes\fR" 4

.IX Item "--no-default-excludes"

When \fB\-\-export\-all\-symbols\fR is used, it will by default avoid

exporting certain special symbols.  The current list of symbols to avoid

exporting is \fBDllMain@12\fR, \fBDllEntryPoint@0\fR,

\&\fBimpure_ptr\fR.  You may use the \fB\-\-no\-default\-excludes\fR option

to go ahead and export these special symbols.  This is only meaningful

when \fB\-\-export\-all\-symbols\fR is used.

.IP "\fB\-S\fR \fIpath\fR" 4

.IX Item "-S path"

.PD 0

.IP "\fB\-\-as\fR \fIpath\fR" 4

.IX Item "--as path"

.PD

Specifies the path, including the filename, of the assembler to be used

to create the exports file.

.IP "\fB\-f\fR \fIoptions\fR" 4

.IX Item "-f options"

.PD 0

.IP "\fB\-\-as\-flags\fR \fIoptions\fR" 4

.IX Item "--as-flags options"

.PD

Specifies any specific command line options to be passed to the

assembler when building the exports file.  This option will work even if

the \fB\-S\fR 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.

.IP "\fB\-D\fR \fIname\fR" 4

.IX Item "-D name"

.PD 0

.IP "\fB\-\-dll\-name\fR \fIname\fR" 4

.IX Item "--dll-name name"

.PD

Specifies the name to be stored in the \fI.def\fR file as the name of

the \s-1DLL\s0 when the \fB\-e\fR option is used.  If this option is not

present, then the filename given to the \fB\-e\fR option will be

used as the name of the \s-1DLL\s0.

.IP "\fB\-m\fR \fImachine\fR" 4

.IX Item "-m machine"

.PD 0

.IP "\fB\-machine\fR \fImachine\fR" 4

.IX Item "-machine machine"

.PD

Specifies the type of machine for which the library file should be

built.  \fBdlltool\fR 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 \s-1ARM\s0 processor, when the

contents of the \s-1DLL\s0 are actually encode using Thumb instructions.

.IP "\fB\-a\fR" 4

.IX Item "-a"

.PD 0

.IP "\fB\-\-add\-indirect\fR" 4

.IX Item "--add-indirect"

.PD

Specifies that when \fBdlltool\fR 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!

.IP "\fB\-U\fR" 4

.IX Item "-U"

.PD 0

.IP "\fB\-\-add\-underscore\fR" 4

.IX Item "--add-underscore"

.PD

Specifies that when \fBdlltool\fR is creating the exports file it

should prepend an underscore to the names of \fIall\fR exported symbols.

.IP "\fB\-\-add\-stdcall\-underscore\fR" 4

.IX Item "--add-stdcall-underscore"

Specifies that when \fBdlltool\fR is creating the exports file it

should prepend an underscore to the names of exported \fIstdcall\fR

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.

.IP "\fB\-k\fR" 4

.IX Item "-k"

.PD 0

.IP "\fB\-\-kill\-at\fR" 4

.IX Item "--kill-at"

.PD

Specifies that when \fBdlltool\fR is creating the exports file it

should not append the string \fB@ \fR.  These numbers are

called ordinal numbers and they represent another way of accessing the

function in a \s-1DLL\s0, other than by name.

.IP "\fB\-A\fR" 4

.IX Item "-A"

.PD 0

.IP "\fB\-\-add\-stdcall\-alias\fR" 4

.IX Item "--add-stdcall-alias"

.PD

Specifies that when \fBdlltool\fR is creating the exports file it

should add aliases for stdcall symbols without \fB@ \fR

in addition to the symbols with \fB@ \fR.

.IP "\fB\-p\fR" 4

.IX Item "-p"

.PD 0

.IP "\fB\-\-ext\-prefix\-alias\fR \fIprefix\fR" 4

.IX Item "--ext-prefix-alias prefix"

.PD

Causes \fBdlltool\fR to create external aliases for all \s-1DLL\s0

imports with the specified prefix.  The aliases are created for both

external and import symbols with no leading underscore.

.IP "\fB\-x\fR" 4

.IX Item "-x"

.PD 0

.IP "\fB\-\-no\-idata4\fR" 4

.IX Item "--no-idata4"

.PD

Specifies that when \fBdlltool\fR is creating the exports and library

files it should omit the \f(CW\*(C`.idata4\*(C'\fR section.  This is for compatibility

with certain operating systems.

.IP "\fB\-\-use\-nul\-prefixed\-import\-tables\fR" 4

.IX Item "--use-nul-prefixed-import-tables"

Specifies that when \fBdlltool\fR is creating the exports and library

files it should prefix the \f(CW\*(C`.idata4\*(C'\fR and \f(CW\*(C`.idata5\*(C'\fR by zero an

element. This emulates old gnu import library generation of

\&\f(CW\*(C`dlltool\*(C'\fR. By default this option is turned off.

.IP "\fB\-c\fR" 4

.IX Item "-c"

.PD 0

.IP "\fB\-\-no\-idata5\fR" 4

.IX Item "--no-idata5"

.PD

Specifies that when \fBdlltool\fR is creating the exports and library

files it should omit the \f(CW\*(C`.idata5\*(C'\fR section.  This is for compatibility

with certain operating systems.

.IP "\fB\-I\fR \fIfilename\fR" 4

.IX Item "-I filename"

.PD 0

.IP "\fB\-\-identify\fR \fIfilename\fR" 4

.IX Item "--identify filename"

.PD

Specifies that \fBdlltool\fR should inspect the import library

indicated by \fIfilename\fR and report, on \f(CW\*(C`stdout\*(C'\fR, the name(s)

of the associated \s-1DLL\s0(s).  This can be performed in addition to any

other operations indicated by the other options and arguments.

\&\fBdlltool\fR fails if the import library does not exist or is not

actually an import library. See also \fB\-\-identify\-strict\fR.

.IP "\fB\-\-identify\-strict\fR" 4

.IX Item "--identify-strict"

Modifies the behavior of the \fB\-\-identify\fR option, such

that an error is reported if \fIfilename\fR is associated with

more than one \s-1DLL\s0.

.IP "\fB\-i\fR" 4

.IX Item "-i"

.PD 0

.IP "\fB\-\-interwork\fR" 4

.IX Item "--interwork"

.PD

Specifies that \fBdlltool\fR should mark the objects in the library

file and exports file that it produces as supporting interworking

between \s-1ARM\s0 and Thumb code.

.IP "\fB\-n\fR" 4

.IX Item "-n"

.PD 0

.IP "\fB\-\-nodelete\fR" 4

.IX Item "--nodelete"

.PD

Makes \fBdlltool\fR 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.

.IP "\fB\-t\fR \fIprefix\fR" 4

.IX Item "-t prefix"

.PD 0

.IP "\fB\-\-temp\-prefix\fR \fIprefix\fR" 4

.IX Item "--temp-prefix prefix"

.PD

Makes \fBdlltool\fR use \fIprefix\fR when constructing the names of

temporary assembler and object files.  By default, the temp file prefix

is generated from the pid.

.IP "\fB\-v\fR" 4

.IX Item "-v"

.PD 0

.IP "\fB\-\-verbose\fR" 4

.IX Item "--verbose"

.PD

Make dlltool describe what it is doing.

.IP "\fB\-h\fR" 4

.IX Item "-h"

.PD 0

.IP "\fB\-\-help\fR" 4

.IX Item "--help"

.PD

Displays a list of command line options and then exits.

.IP "\fB\-V\fR" 4

.IX Item "-V"

.PD 0

.IP "\fB\-\-version\fR" 4

.IX Item "--version"

.PD

Displays dlltool's version number and then exits.

.IP "\fB@\fR\fIfile\fR" 4

.IX Item "@file"

Read command-line options from \fIfile\fR.  The options read are

inserted in place of the original @\fIfile\fR option.  If \fIfile\fR

does not exist, or cannot be read, then the option will be treated

literally, and not removed.

.Sp

Options in \fIfile\fR 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 \fIfile\fR may itself contain additional

@\fIfile\fR options; any such options will be processed recursively.

.SH "SEE ALSO"

.IX Header "SEE ALSO"

The Info pages for \fIbinutils\fR.

.SH "COPYRIGHT"

.IX Header "COPYRIGHT"

Copyright (c) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,

2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.

.PP

Permission is granted to copy, distribute and/or modify this document

under the terms of the \s-1GNU\s0 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 \*(L"\s-1GNU\s0 Free Documentation License\*(R".