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<title>Using the GNU Compiler Collection (GCC): S/390 Function Attributes</title>
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<a name="S_002f390-Function-Attributes"></a>
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<div class="header">
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<p>
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Next: <a href="SH-Function-Attributes.html#SH-Function-Attributes" accesskey="n" rel="next">SH Function Attributes</a>, Previous: <a href="RX-Function-Attributes.html#RX-Function-Attributes" accesskey="p" rel="prev">RX Function Attributes</a>, Up: <a href="Function-Attributes.html#Function-Attributes" accesskey="u" rel="up">Function Attributes</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
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<a name="S_002f390-Function-Attributes-1"></a>
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<h4 class="subsection">6.31.26 S/390 Function Attributes</h4>
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<p>These function attributes are supported on the S/390:
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</p>
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<dl compact="compact">
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<dt><code>hotpatch (<var>halfwords-before-function-label</var>,<var>halfwords-after-function-label</var>)</code></dt>
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<dd><a name="index-hotpatch-function-attribute_002c-S_002f390"></a>
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<p>On S/390 System z targets, you can use this function attribute to
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make GCC generate a “hot-patching” function prologue. If the
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<samp>-mhotpatch=</samp> command-line option is used at the same time,
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the <code>hotpatch</code> attribute takes precedence. The first of the
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two arguments specifies the number of halfwords to be added before
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the function label. A second argument can be used to specify the
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number of halfwords to be added after the function label. For
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both arguments the maximum allowed value is 1000000.
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</p>
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<p>If both arguments are zero, hotpatching is disabled.
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</p>
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</dd>
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<dt><code>target (<var>options</var>)</code></dt>
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<dd><a name="index-target-function-attribute-4"></a>
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<p>As discussed in <a href="Common-Function-Attributes.html#Common-Function-Attributes">Common Function Attributes</a>, this attribute
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allows specification of target-specific compilation options.
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</p>
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<p>On S/390, the following options are supported:
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</p>
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<dl compact="compact">
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<dt>‘<samp>arch=</samp>’</dt>
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<dt>‘<samp>tune=</samp>’</dt>
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<dt>‘<samp>stack-guard=</samp>’</dt>
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<dt>‘<samp>stack-size=</samp>’</dt>
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<dt>‘<samp>branch-cost=</samp>’</dt>
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<dt>‘<samp>warn-framesize=</samp>’</dt>
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<dt>‘<samp>backchain</samp>’</dt>
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<dt>‘<samp>no-backchain</samp>’</dt>
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<dt>‘<samp>hard-dfp</samp>’</dt>
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<dt>‘<samp>no-hard-dfp</samp>’</dt>
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<dt>‘<samp>hard-float</samp>’</dt>
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<dt>‘<samp>soft-float</samp>’</dt>
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<dt>‘<samp>htm</samp>’</dt>
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<dt>‘<samp>no-htm</samp>’</dt>
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<dt>‘<samp>vx</samp>’</dt>
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<dt>‘<samp>no-vx</samp>’</dt>
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<dt>‘<samp>packed-stack</samp>’</dt>
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<dt>‘<samp>no-packed-stack</samp>’</dt>
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<dt>‘<samp>small-exec</samp>’</dt>
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<dt>‘<samp>no-small-exec</samp>’</dt>
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<dt>‘<samp>mvcle</samp>’</dt>
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<dt>‘<samp>no-mvcle</samp>’</dt>
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<dt>‘<samp>warn-dynamicstack</samp>’</dt>
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<dt>‘<samp>no-warn-dynamicstack</samp>’</dt>
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</dl>
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<p>The options work exactly like the S/390 specific command line
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options (without the prefix <samp>-m</samp>) except that they do not
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change any feature macros. For example,
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</p>
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<div class="smallexample">
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<pre class="smallexample"><code>target("no-vx")</code>
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</pre></div>
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<p>does not undefine the <code>__VEC__</code> macro.
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</p></dd>
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</dl>
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