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<title>GNU Compiler Collection (GCC) Internals: Require Support</title>
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<a name="Require-Support"></a>
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<div class="header">
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<p>
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Next: <a href="Final-Actions.html#Final-Actions" accesskey="n" rel="next">Final Actions</a>, Previous: <a href="Add-Options.html#Add-Options" accesskey="p" rel="prev">Add Options</a>, Up: <a href="Test-Directives.html#Test-Directives" accesskey="u" rel="up">Test Directives</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="Variants-of-dg_002drequire_002dsupport"></a>
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<h4 class="subsection">7.2.5 Variants of <code>dg-require-<var>support</var></code></h4>
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<p>A few of the <code>dg-require</code> directives take arguments.
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</p>
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<dl compact="compact">
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<dt><code>dg-require-iconv <var>codeset</var></code></dt>
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<dd><p>Skip the test if the target does not support iconv. <var>codeset</var> is
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the codeset to convert to.
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</p>
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</dd>
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<dt><code>dg-require-profiling <var>profopt</var></code></dt>
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<dd><p>Skip the test if the target does not support profiling with option
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<var>profopt</var>.
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</p>
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</dd>
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<dt><code>dg-require-visibility <var>vis</var></code></dt>
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<dd><p>Skip the test if the target does not support the <code>visibility</code> attribute.
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If <var>vis</var> is <code>""</code>, support for <code>visibility("hidden")</code> is
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checked, for <code>visibility("<var>vis</var>")</code> otherwise.
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</p></dd>
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</dl>
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<p>The original <code>dg-require</code> directives were defined before there
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was support for effective-target keywords. The directives that do not
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take arguments could be replaced with effective-target keywords.
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</p>
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<dl compact="compact">
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<dt><code>dg-require-alias ""</code></dt>
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<dd><p>Skip the test if the target does not support the ‘<samp>alias</samp>’ attribute.
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</p>
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</dd>
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<dt><code>dg-require-ascii-locale ""</code></dt>
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<dd><p>Skip the test if the host does not support an ASCII locale.
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</p>
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</dd>
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<dt><code>dg-require-compat-dfp ""</code></dt>
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<dd><p>Skip this test unless both compilers in a <samp>compat</samp> testsuite
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support decimal floating point.
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</p>
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</dd>
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<dt><code>dg-require-cxa-atexit ""</code></dt>
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<dd><p>Skip the test if the target does not support <code>__cxa_atexit</code>.
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This is equivalent to <code>dg-require-effective-target cxa_atexit</code>.
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</p>
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</dd>
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<dt><code>dg-require-dll ""</code></dt>
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<dd><p>Skip the test if the target does not support DLL attributes.
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</p>
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</dd>
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<dt><code>dg-require-fork ""</code></dt>
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<dd><p>Skip the test if the target does not support <code>fork</code>.
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</p>
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</dd>
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<dt><code>dg-require-gc-sections ""</code></dt>
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<dd><p>Skip the test if the target’s linker does not support the
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<code>--gc-sections</code> flags.
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This is equivalent to <code>dg-require-effective-target gc-sections</code>.
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</p>
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</dd>
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<dt><code>dg-require-host-local ""</code></dt>
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<dd><p>Skip the test if the host is remote, rather than the same as the build
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system. Some tests are incompatible with DejaGnu’s handling of remote
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hosts, which involves copying the source file to the host and compiling
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it with a relative path and "<code>-o a.out</code>".
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</p>
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</dd>
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<dt><code>dg-require-mkfifo ""</code></dt>
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<dd><p>Skip the test if the target does not support <code>mkfifo</code>.
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</p>
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</dd>
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<dt><code>dg-require-named-sections ""</code></dt>
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<dd><p>Skip the test is the target does not support named sections.
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This is equivalent to <code>dg-require-effective-target named_sections</code>.
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</p>
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</dd>
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<dt><code>dg-require-weak ""</code></dt>
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<dd><p>Skip the test if the target does not support weak symbols.
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</p>
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</dd>
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<dt><code>dg-require-weak-override ""</code></dt>
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<dd><p>Skip the test if the target does not support overriding weak symbols.
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</p></dd>
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</dl>
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<hr>
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<p>
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Next: <a href="Final-Actions.html#Final-Actions" accesskey="n" rel="next">Final Actions</a>, Previous: <a href="Add-Options.html#Add-Options" accesskey="p" rel="prev">Add Options</a>, Up: <a href="Test-Directives.html#Test-Directives" accesskey="u" rel="up">Test Directives</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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