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<title>GNU Binary Utilities: def file format</title>
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<a name="def-file-format"></a>
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<p>
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Up: <a href="dlltool.html#dlltool" accesskey="u" rel="up">dlltool</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Binutils-Index.html#Binutils-Index" title="Index" rel="index">Index</a>]</p>
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<a name="The-format-of-the-dlltool-_002edef-file"></a>
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<h3 class="section">14.1 The format of the <code>dlltool</code> <samp>.def</samp> file</h3>
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<p>A <samp>.def</samp> file contains any number of the following commands:
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</p>
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<dl compact="compact">
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<dt><code>NAME</code> <var>name</var> <code>[ ,</code> <var>base</var> <code>]</code></dt>
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<dd><p>The result is going to be named <var>name</var><code>.exe</code>.
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</p>
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</dd>
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<dt><code>LIBRARY</code> <var>name</var> <code>[ ,</code> <var>base</var> <code>]</code></dt>
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<dd><p>The result is going to be named <var>name</var><code>.dll</code>.
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Note: If you want to use LIBRARY as name then you need to quote. Otherwise
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this will fail due a necessary hack for libtool (see PR binutils/13710 for more
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details).
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</p>
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</dd>
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<dt><code>EXPORTS ( ( (</code> <var>name1</var> <code>[ = </code> <var>name2</var> <code>] ) | ( </code> <var>name1</var> <code>=</code> <var>module-name</var> <code>.</code> <var>external-name</var> <code>) ) [ == </code> <var>its_name</var> <code>]</code></dt>
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<dt><code>[</code> <var>integer</var> <code>] [ NONAME ] [ CONSTANT ] [ DATA ] [ PRIVATE ] ) *</code></dt>
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<dd><p>Declares <var>name1</var> as an exported symbol from the DLL, with optional
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ordinal number <var>integer</var>, or declares <var>name1</var> as an alias
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(forward) of the function <var>external-name</var> in the DLL.
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If <var>its_name</var> is specified, this name is used as string in export table.
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<var>module-name</var>.
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Note: The <code>EXPORTS</code> has to be the last command in .def file, as keywords
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are treated - beside <code>LIBRARY</code> - as simple name-identifiers.
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If you want to use LIBRARY as name then you need to quote it.
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</p>
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</dd>
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<dt><code>IMPORTS ( (</code> <var>internal-name</var> <code>=</code> <var>module-name</var> <code>.</code> <var>integer</var> <code>) | [</code> <var>internal-name</var> <code>= ]</code> <var>module-name</var> <code>.</code> <var>external-name</var> <code>) [ == ) <var>its_name</var> <code>]</code> *</code></dt>
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<dd><p>Declares that <var>external-name</var> or the exported function whose
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ordinal number is <var>integer</var> is to be imported from the file
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<var>module-name</var>. If <var>internal-name</var> is specified then this is
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the name that the imported function will be referred to in the body of
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the DLL.
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If <var>its_name</var> is specified, this name is used as string in import table.
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Note: The <code>IMPORTS</code> has to be the last command in .def file, as keywords
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are treated - beside <code>LIBRARY</code> - as simple name-identifiers.
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If you want to use LIBRARY as name then you need to quote it.
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</p>
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</dd>
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<dt><code>DESCRIPTION</code> <var>string</var></dt>
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<dd><p>Puts <var>string</var> into the output <samp>.exp</samp> file in the
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<code>.rdata</code> section.
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</p>
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</dd>
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<dt><code>STACKSIZE</code> <var>number-reserve</var> <code>[, </code> <var>number-commit</var> <code>]</code></dt>
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<dt><code>HEAPSIZE</code> <var>number-reserve</var> <code>[, </code> <var>number-commit</var> <code>]</code></dt>
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<dd><p>Generates <code>--stack</code> or <code>--heap</code>
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<var>number-reserve</var>,<var>number-commit</var> in the output <code>.drectve</code>
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section. The linker will see this and act upon it.
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</p>
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</dd>
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<dt><code>CODE</code> <var>attr</var> <code>+</code></dt>
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<dt><code>DATA</code> <var>attr</var> <code>+</code></dt>
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<dt><code>SECTIONS (</code> <var>section-name</var> <var>attr</var><code> + ) *</code></dt>
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<dd><p>Generates <code>--attr</code> <var>section-name</var> <var>attr</var> in the output
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<code>.drectve</code> section, where <var>attr</var> is one of <code>READ</code>,
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<code>WRITE</code>, <code>EXECUTE</code> or <code>SHARED</code>. The linker will see
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this and act upon it.
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</p>
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</dd>
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