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130 lines
5.3 KiB
HTML
130 lines
5.3 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1988-2018 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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Texts being (a) (see below), and with the Back-Cover Texts being (b)
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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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software. Copies published by the Free Software Foundation raise
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funds for GNU development. -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>LTO Testing (GNU Compiler Collection (GCC) Internals)</title>
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<meta name="description" content="LTO Testing (GNU Compiler Collection (GCC) Internals)">
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<meta name="keywords" content="LTO Testing (GNU Compiler Collection (GCC) Internals)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Testsuites.html#Testsuites" rel="up" title="Testsuites">
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<link href="gcov-Testing.html#gcov-Testing" rel="next" title="gcov Testing">
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<link href="C-Tests.html#C-Tests" rel="prev" title="C Tests">
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<style type="text/css">
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-->
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</style>
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</head>
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<body lang="en">
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<a name="LTO-Testing"></a>
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<div class="header">
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<p>
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Next: <a href="gcov-Testing.html#gcov-Testing" accesskey="n" rel="next">gcov Testing</a>, Previous: <a href="C-Tests.html#C-Tests" accesskey="p" rel="prev">C 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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</div>
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<hr>
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<a name="Support-for-testing-link_002dtime-optimizations"></a>
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<h3 class="section">7.5 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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</dl>
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</body>
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</html>
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