dlltool.1

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.\" ========================================================================
.\"
.IX Title "DLLTOOL 1"
.TH DLLTOOL 1 "2006-08-25" "binutils-2.17.50" "GNU Development Tools"
.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\-\-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\-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:<name_of_function>\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"");
.Ve
.PP
.Vb 1
\&          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.  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
\&\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
.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