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91 lines
4.3 KiB
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91 lines
4.3 KiB
HTML
4 years ago
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<title>LTO Testing - GNU Compiler Collection (GCC) Internals</title>
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<meta name="description" content="GNU Compiler Collection (GCC) Internals">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Testsuites.html#Testsuites" title="Testsuites">
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<link rel="prev" href="libgcj-Tests.html#libgcj-Tests" title="libgcj Tests">
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<link rel="next" href="gcov-Testing.html#gcov-Testing" title="gcov Testing">
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Copyright (C) 1988-2015 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being ``Funding Free Software'', the Front-Cover
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(see below). A copy of the license is included in the section entitled
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``GNU Free Documentation License''.
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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</head>
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<body>
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<div class="node">
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<a name="LTO-Testing"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="gcov-Testing.html#gcov-Testing">gcov Testing</a>,
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Previous: <a rel="previous" accesskey="p" href="libgcj-Tests.html#libgcj-Tests">libgcj Tests</a>,
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Up: <a rel="up" accesskey="u" href="Testsuites.html#Testsuites">Testsuites</a>
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<hr>
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</div>
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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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<dl>
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<dt><code>{ dg-lto-do </code><var>do-what-keyword</var><code> }</code><dd><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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<dl>
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<dt><code>assemble</code><dd>Compile with <samp><span class="option">-c</span></samp> to produce a relocatable object file.
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<br><dt><code>link</code><dd>Compile, assemble, and link to produce an executable file.
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<br><dt><code>run</code><dd>Produce and run an executable file, which is expected to return
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an exit code of 0.
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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>Unlike <code>dg-do</code>, <code>dg-lto-do</code> does not support an optional
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‘<samp><span class="samp">target</span></samp>’ or ‘<samp><span class="samp">xfail</span></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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<br><dt><code>{ dg-lto-options { { </code><var>options</var><code> } [{ </code><var>options</var><code> }] } [{ target </code><var>selector</var><code> }]}</code><dd>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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<br><dt><code>{ dg-extra-ld-options </code><var>options</var><code> [{ target </code><var>selector</var><code> }]}</code><dd>This directive adds <var>options</var> to the linker options used.
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<br><dt><code>{ dg-suppress-ld-options </code><var>options</var><code> [{ target </code><var>selector</var><code> }]}</code><dd>This directive removes <var>options</var> from the set of linker options used.
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</dl>
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</body></html>
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