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<a name="Torture-Tests"></a>
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<a name="Support-for-torture-testing-using-multiple-options"></a>
<h3 class="section">7.9 Support for torture testing using multiple options</h3>

<p>Throughout the compiler testsuite there are several directories whose
tests are run multiple times, each with a different set of options.
These are known as torture tests.
<samp>lib/torture-options.exp</samp> defines procedures to
set up these lists:
</p>
<dl compact="compact">
<dt><code>torture-init</code></dt>
<dd><p>Initialize use of torture lists.
</p></dd>
<dt><code>set-torture-options</code></dt>
<dd><p>Set lists of torture options to use for tests with and without loops.
Optionally combine a set of torture options with a set of other
options, as is done with Objective-C runtime options.
</p></dd>
<dt><code>torture-finish</code></dt>
<dd><p>Finalize use of torture lists.
</p></dd>
</dl>

<p>The <samp>.exp</samp> file for a set of tests that use torture options must
include calls to these three procedures if:
</p>
<ul>
<li> It calls <code>gcc-dg-runtest</code> and overrides <var>DG_TORTURE_OPTIONS</var>.

</li><li> It calls <var>${tool}</var><code>-torture</code> or
<var>${tool}</var><code>-torture-execute</code>, where <var>tool</var> is <code>c</code>,
<code>fortran</code>, or <code>objc</code>.

</li><li> It calls <code>dg-pch</code>.
</li></ul>

<p>It is not necessary for a <samp>.exp</samp> file that calls <code>gcc-dg-runtest</code>
to call the torture procedures if the tests should use the list in
<var>DG_TORTURE_OPTIONS</var> defined in <samp>gcc-dg.exp</samp>.
</p>
<p>Most uses of torture options can override the default lists by defining
<var>TORTURE_OPTIONS</var> or add to the default list by defining
<var>ADDITIONAL_TORTURE_OPTIONS</var>.  Define these in a <samp>.dejagnurc</samp>
file or add them to the <samp>site.exp</samp> file; for example
</p>
<div class="smallexample">
<pre class="smallexample">set ADDITIONAL_TORTURE_OPTIONS  [list \
  { -O2 -ftree-loop-linear } \
  { -O2 -fpeel-loops } ]
</pre></div>


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