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<title>__attribute__</title>
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<a xmlns="http://www.w3.org/1999/xhtml" id="attribute"></a>
<h1>__attribute__</h1>
<p>
</p>
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<div class="refsect2">
<a id="synopsis"></a>
<h3>
</h3>
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<td align="left">
__attribute__ ((<em class="replaceable"><code>attribute-list</code></em>))
attribute-list:
attribute<sub>opt</sub>
attribute-list, attribute<sub>opt</sub>
attribute:
attribute-token attribute-argument-clause<sub>opt</sub>
attribute-token:
identifier
attribute-argument-clause:
( attribute-argument-list )
attribute-argument-list:
attribute-argument
attribute-argument-list, attribute-argument
attribute-argument:
assignment-expression
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<div class="refsect1">
<a id="description"></a>
<h2>Description</h2>
<p>
This section describes the syntax with which <code class="code">__attribute__</code> may be used,
and the constructs to which attribute specifiers bind.
</p>
<p>
An attribute specifier is of the form <code class="constant">__attribute__
((<em class="replaceable"><code>attribute-list</code></em>))</code>.
</p>
<p>
This syntax is taken directly from GCC but unlike GCC, which allows attributes to be
applied only to functions, types, and variables, OpenCL attributes can be associated
with:
</p>
<div class="itemizedlist">
<ul class="itemizedlist" style="list-style-type: bullet; ">
<li class="listitem" style="list-style-type: disc">
<p>
<a class="citerefentry" href="attributes-types.html"><span class="citerefentry"><span class="refentrytitle">types</span></span></a>
</p>
</li>
<li class="listitem" style="list-style-type: disc">
<p>
<a class="citerefentry" href="functionQualifiers.html"><span class="citerefentry"><span class="refentrytitle">functions</span></span></a>
</p>
</li>
<li class="listitem" style="list-style-type: disc">
<p>
<a class="citerefentry" href="attributes-variables.html"><span class="citerefentry"><span class="refentrytitle">variables</span></span></a>
</p>
</li>
<li class="listitem" style="list-style-type: disc">
<p>
<a class="citerefentry" href="attributes-blocksAndControlFlow.html"><span class="citerefentry"><span class="refentrytitle">blocks</span></span></a>
</p>
</li>
<li class="listitem" style="list-style-type: disc">
<p>
<a class="citerefentry" href="attributes-blocksAndControlFlow.html"><span class="citerefentry"><span class="refentrytitle">control-flow statements</span></span></a>
</p>
</li>
</ul>
</div>
<p>
In general, the rules for how an attribute binds for a given context are non-trivial
and the reader is pointed to GCC's documentation and Maurer and Wong's paper (See the
"References" section in the <a href="http://www.khronos.org/registry/cl/specs/opencl-1.2.pdf#page=355" target="OpenCL Spec">OpenCL specification</a>
for details.)
</p>
</div>
<div class="refsect1">
<a id="specification"></a>
<h2>Specification</h2>
<p>
<img src="pdficon_small1.gif" />
<a href="http://www.khronos.org/registry/cl/specs/opencl-1.2.pdf#page=236" target="OpenCL Spec">OpenCL Specification</a>
</p>
</div>
<div class="refsect1">
<a id="seealso"></a>
<h2>Also see</h2>
<p>
<a class="citerefentry" href="attributes-types.html"><span class="citerefentry"><span class="refentrytitle">Type Attributes</span></span></a>,
<a class="citerefentry" href="attributes-variables.html"><span class="citerefentry"><span class="refentrytitle">Variable Attributes</span></span></a>,
<a class="citerefentry" href="attributes-blocksAndControlFlow.html"><span class="citerefentry"><span class="refentrytitle">Block and Control-Flow Statement Attributes</span></span></a>,
<a class="citerefentry" href="functionQualifiers.html"><span class="citerefentry"><span class="refentrytitle">Function Qualifiers</span></span></a>
</p>
</div>
<div xmlns="" class="refsect3" lang="en" xml:lang="en"><a xmlns="http://www.w3.org/1999/xhtml" id="Copyright"></a><h4 xmlns="http://www.w3.org/1999/xhtml"></h4><img xmlns="http://www.w3.org/1999/xhtml" src="KhronosLogo.jpg" /><p xmlns="http://www.w3.org/1999/xhtml"></p>Copyright © 2007-2011 The Khronos Group Inc.
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