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