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<a name="D-ABI-parameters"></a>
<h3 class="section">18.29 D ABI parameters</h3>
<a name="index-parameters_002c-d-abi"></a>

<dl>
<dt><a name="index-TARGET_005fD_005fCPU_005fVERSIONS"></a>D Target Hook: <em>void</em> <strong>TARGET_D_CPU_VERSIONS</strong> <em>(void)</em></dt>
<dd><p>Declare all environmental version identifiers relating to the target CPU
using the function <code>builtin_version</code>, which takes a string representing
the name of the version.  Version identifiers predefined by this hook apply
to all modules that are being compiled and imported.
</p></dd></dl>

<dl>
<dt><a name="index-TARGET_005fD_005fOS_005fVERSIONS"></a>D Target Hook: <em>void</em> <strong>TARGET_D_OS_VERSIONS</strong> <em>(void)</em></dt>
<dd><p>Similarly to <code>TARGET_D_CPU_VERSIONS</code>, but is used for versions
relating to the target operating system.
</p></dd></dl>

<dl>
<dt><a name="index-TARGET_005fD_005fCRITSEC_005fSIZE"></a>D Target Hook: <em>unsigned</em> <strong>TARGET_D_CRITSEC_SIZE</strong> <em>(void)</em></dt>
<dd><p>Returns the size of the data structure used by the target operating system
for critical sections and monitors.  For example, on Microsoft Windows this
would return the <code>sizeof(CRITICAL_SECTION)</code>, while other platforms that
implement pthreads would return <code>sizeof(pthread_mutex_t)</code>.
</p></dd></dl>


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