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<a name="Require-Support"></a>
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<hr>
<a name="Variants-of-dg_002drequire_002dsupport"></a>
<h4 class="subsection">7.2.5 Variants of <code>dg-require-<var>support</var></code></h4>

<p>A few of the <code>dg-require</code> directives take arguments.
</p>
<dl compact="compact">
<dt><code>dg-require-iconv <var>codeset</var></code></dt>
<dd><p>Skip the test if the target does not support iconv.  <var>codeset</var> is
the codeset to convert to.
</p>
</dd>
<dt><code>dg-require-profiling <var>profopt</var></code></dt>
<dd><p>Skip the test if the target does not support profiling with option
<var>profopt</var>.
</p>
</dd>
<dt><code>dg-require-stack-check <var>check</var></code></dt>
<dd><p>Skip the test if the target does not support the <code>-fstack-check</code>
option.  If <var>check</var> is <code>&quot;&quot;</code>, support for <code>-fstack-check</code>
is checked, for <code>-fstack-check=(&quot;<var>check</var>&quot;)</code> otherwise.
</p>
</dd>
<dt><code>dg-require-stack-size <var>size</var></code></dt>
<dd><p>Skip the test if the target does not support a stack size of <var>size</var>.
</p>
</dd>
<dt><code>dg-require-visibility <var>vis</var></code></dt>
<dd><p>Skip the test if the target does not support the <code>visibility</code> attribute.
If <var>vis</var> is <code>&quot;&quot;</code>, support for <code>visibility(&quot;hidden&quot;)</code> is
checked, for <code>visibility(&quot;<var>vis</var>&quot;)</code> otherwise.
</p></dd>
</dl>

<p>The original <code>dg-require</code> directives were defined before there
was support for effective-target keywords.  The directives that do not
take arguments could be replaced with effective-target keywords.
</p>
<dl compact="compact">
<dt><code>dg-require-alias &quot;&quot;</code></dt>
<dd><p>Skip the test if the target does not support the &lsquo;<samp>alias</samp>&rsquo; attribute.
</p>
</dd>
<dt><code>dg-require-ascii-locale &quot;&quot;</code></dt>
<dd><p>Skip the test if the host does not support an ASCII locale.
</p>
</dd>
<dt><code>dg-require-compat-dfp &quot;&quot;</code></dt>
<dd><p>Skip this test unless both compilers in a <samp>compat</samp> testsuite
support decimal floating point.
</p>
</dd>
<dt><code>dg-require-cxa-atexit &quot;&quot;</code></dt>
<dd><p>Skip the test if the target does not support <code>__cxa_atexit</code>.
This is equivalent to <code>dg-require-effective-target cxa_atexit</code>.
</p>
</dd>
<dt><code>dg-require-dll &quot;&quot;</code></dt>
<dd><p>Skip the test if the target does not support DLL attributes.
</p>
</dd>
<dt><code>dg-require-dot &quot;&quot;</code></dt>
<dd><p>Skip the test if the host does not have <code>dot</code>.
</p>
</dd>
<dt><code>dg-require-fork &quot;&quot;</code></dt>
<dd><p>Skip the test if the target does not support <code>fork</code>.
</p>
</dd>
<dt><code>dg-require-gc-sections &quot;&quot;</code></dt>
<dd><p>Skip the test if the target&rsquo;s linker does not support the
<code>--gc-sections</code> flags.
This is equivalent to <code>dg-require-effective-target gc-sections</code>.
</p>
</dd>
<dt><code>dg-require-host-local &quot;&quot;</code></dt>
<dd><p>Skip the test if the host is remote, rather than the same as the build
system.  Some tests are incompatible with DejaGnu&rsquo;s handling of remote
hosts, which involves copying the source file to the host and compiling
it with a relative path and &quot;<code>-o a.out</code>&quot;.
</p>
</dd>
<dt><code>dg-require-mkfifo &quot;&quot;</code></dt>
<dd><p>Skip the test if the target does not support <code>mkfifo</code>.
</p>
</dd>
<dt><code>dg-require-named-sections &quot;&quot;</code></dt>
<dd><p>Skip the test is the target does not support named sections.
This is equivalent to <code>dg-require-effective-target named_sections</code>.
</p>
</dd>
<dt><code>dg-require-weak &quot;&quot;</code></dt>
<dd><p>Skip the test if the target does not support weak symbols.
</p>
</dd>
<dt><code>dg-require-weak-override &quot;&quot;</code></dt>
<dd><p>Skip the test if the target does not support overriding weak symbols.
</p></dd>
</dl>

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