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<title>GNU Compiler Collection (GCC) Internals: LTO Testing</title>
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Next: <a href="gcov-Testing.html#gcov-Testing" accesskey="n" rel="next">gcov Testing</a>, Previous: <a href="libgcj-Tests.html#libgcj-Tests" accesskey="p" rel="prev">libgcj Tests</a>, Up: <a href="Testsuites.html#Testsuites" accesskey="u" rel="up">Testsuites</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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<a name="Support-for-testing-link_002dtime-optimizations"></a>
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<h3 class="section">7.6 Support for testing link-time optimizations</h3>
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<p>Tests for link-time optimizations usually require multiple source files
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that are compiled separately, perhaps with different sets of options.
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There are several special-purpose test directives used for these tests.
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</p>
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<dl compact="compact">
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<dt><code>{ dg-lto-do <var>do-what-keyword</var> }</code></dt>
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<dd><p><var>do-what-keyword</var> specifies how the test is compiled and whether
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it is executed. It is one of:
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</p>
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<dl compact="compact">
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<dt><code>assemble</code></dt>
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<dd><p>Compile with <samp>-c</samp> to produce a relocatable object file.
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</p></dd>
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<dt><code>link</code></dt>
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<dd><p>Compile, assemble, and link to produce an executable file.
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</p></dd>
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<dt><code>run</code></dt>
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<dd><p>Produce and run an executable file, which is expected to return
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an exit code of 0.
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</p></dd>
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</dl>
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<p>The default is <code>assemble</code>. That can be overridden for a set of
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tests by redefining <code>dg-do-what-default</code> within the <code>.exp</code>
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file for those tests.
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</p>
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<p>Unlike <code>dg-do</code>, <code>dg-lto-do</code> does not support an optional
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‘<samp>target</samp>’ or ‘<samp>xfail</samp>’ list. Use <code>dg-skip-if</code>,
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<code>dg-xfail-if</code>, or <code>dg-xfail-run-if</code>.
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</p>
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</dd>
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<dt><code>{ dg-lto-options { { <var>options</var> } [{ <var>options</var> }] } [{ target <var>selector</var> }]}</code></dt>
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<dd><p>This directive provides a list of one or more sets of compiler options
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to override <var>LTO_OPTIONS</var>. Each test will be compiled and run with
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each of these sets of options.
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</p>
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</dd>
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<dt><code>{ dg-extra-ld-options <var>options</var> [{ target <var>selector</var> }]}</code></dt>
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<dd><p>This directive adds <var>options</var> to the linker options used.
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</p>
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</dd>
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<dt><code>{ dg-suppress-ld-options <var>options</var> [{ target <var>selector</var> }]}</code></dt>
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<dd><p>This directive removes <var>options</var> from the set of linker options used.
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</p></dd>
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