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<main>
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<h2 id="采用发布配置自定义构建"><a class="header" href="#采用发布配置自定义构建">采用发布配置自定义构建</a></h2>
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<!-- https://github.com/rust-lang/book/blob/main/src/ch14-01-release-profiles.md -->
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<!-- commit 56ec353290429e6547109e88afea4de027b0f1a9 -->
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<p>在 Rust 中<strong>发布配置</strong>（<em>release profiles</em>）文件是预定义和可定制的，它们包含不同的配置，允许程序员更灵活地控制代码编译的多种选项。每一个配置都相互独立。</p>
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<p>Cargo 有两个主要的配置：运行 <code>cargo build</code> 时采用的 <code>dev</code> 配置和运行 <code>cargo build --release</code> 的 <code>release</code> 配置。<code>dev</code> 配置为开发定义了良好的默认配置，<code>release</code> 配置则为发布构建定义了良好的默认配置。</p>
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<p>这些配置名称可能很眼熟，因为它们出现在构建的输出中：</p>
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<pre><code class="language-console">$ cargo build
|
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|
Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.00s
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$ cargo build --release
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Finished `release` profile [optimized] target(s) in 0.32s
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</code></pre>
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<p>构建输出中的 <code>dev</code> 和 <code>release</code> 表明编译器在使用不同的配置。</p>
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<p>当项目的 <em>Cargo.toml</em> 文件中没有显式增加任何 <code>[profile.*]</code> 部分的时候，Cargo 会对每一个配置都采用默认设置。通过增加任何希望定制的配置对应的 <code>[profile.*]</code> 部分，我们可以选择覆盖任意默认设置的子集。例如，如下是 <code>dev</code> 和 <code>release</code> 配置的 <code>opt-level</code> 设置的默认值：</p>
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<p><span class="filename">文件名：Cargo.toml</span></p>
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<pre><code class="language-toml">[profile.dev]
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opt-level = 0
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[profile.release]
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opt-level = 3
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</code></pre>
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<p><code>opt-level</code> 设置控制 Rust 会对代码进行何种程度的优化。这个配置的值从 0 到 3。越高的优化级别需要更多的时间编译，所以如果你在进行开发并经常编译，可能会希望在牺牲一些代码性能的情况下减少优化以便编译得快一些。因此 <code>dev</code> 的 <code>opt-level</code> 默认为 <code>0</code>。当你准备发布时，花费更多时间在编译上则更好。只需要在发布模式编译一次，而编译出来的程序则会运行很多次，所以发布模式用更长的编译时间换取运行更快的代码。这正是为什么 <code>release</code> 配置的 <code>opt-level</code> 默认为 <code>3</code>。</p>
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<p>我们可以选择通过在 <em>Cargo.toml</em> 增加不同的值来覆盖任何默认设置。比如，如果我们想要在开发配置中使用级别 1 的优化，则可以在 <em>Cargo.toml</em> 中增加这两行：</p>
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<p><span class="filename">文件名：Cargo.toml</span></p>
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<pre><code class="language-toml">[profile.dev]
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opt-level = 1
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</code></pre>
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<p>这会覆盖默认的设置 <code>0</code>。现在运行 <code>cargo build</code> 时，Cargo 将会使用 <code>dev</code> 的默认配置加上定制的 <code>opt-level</code>。因为 <code>opt-level</code> 设置为 <code>1</code>，Cargo 会比默认进行更多的优化，但是没有发布构建那么多。</p>
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<p>对于每个配置的设置和其默认值的完整列表，请参阅<a href="https://doc.rust-lang.org/cargo/reference/profiles.html">Cargo 的文档</a>。</p>
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