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<ol class="chapter"><li class="expanded affix "><a href="title-page.html">The Rust Programming Language</a></li><li class="expanded affix "><a href="foreword.html">Foreword</a></li><li class="expanded affix "><a href="ch00-00-introduction.html">Introduction</a></li><li class="expanded "><a href="ch01-00-getting-started.html"><strong aria-hidden="true">1.</strong> Getting Started</a></li><li><ol class="section"><li class="expanded "><a href="ch01-01-installation.html"><strong aria-hidden="true">1.1.</strong> Installation</a></li><li class="expanded "><a href="ch01-02-hello-world.html"><strong aria-hidden="true">1.2.</strong> Hello, World!</a></li><li class="expanded "><a href="ch01-03-hello-cargo.html"><strong aria-hidden="true">1.3.</strong> Hello, Cargo!</a></li></ol></li><li class="expanded "><a href="ch02-00-guessing-game-tutorial.html"><strong aria-hidden="true">2.</strong> Programming a Guessing Game</a></li><li class="expanded "><a href="ch03-00-common-programming-concepts.html"><strong aria-hidden="true">3.</strong> Common Programming Concepts</a></li><li><ol class="section"><li class="expanded "><a href="ch03-01-variables-and-mutability.html"><strong aria-hidden="true">3.1.</strong> Variables and Mutability</a></li><li class="expanded "><a href="ch03-02-data-types.html"><strong aria-hidden="true">3.2.</strong> Data Types</a></li><li class="expanded "><a href="ch03-03-how-functions-work.html"><strong aria-hidden="true">3.3.</strong> Functions</a></li><li class="expanded "><a href="ch03-04-comments.html"><strong aria-hidden="true">3.4.</strong> Comments</a></li><li class="expanded "><a href="ch03-05-control-flow.html"><strong aria-hidden="true">3.5.</strong> Control Flow</a></li></ol></li><li class="expanded "><a href="ch04-00-understanding-ownership.html"><strong aria-hidden="true">4.</strong> Understanding Ownership</a></li><li><ol class="section"><li class="expanded "><a href="ch04-01-what-is-ownership.html"><strong aria-hidden="true">4.1.</strong> What is Ownership?</a></li><li class="expanded "><a href="ch04-02-references-and-borrowing.html"><strong aria-hidden="true">4.2.</strong> References and Borrowing</a></li><li class="expanded "><a href="ch04-03-slices.html"><strong aria-hidden="true">4.3.</strong> The Slice Type</a></li></ol></li><li class="expanded "><a href="ch05-00-structs.html"><strong aria-hidden="true">5.</strong> Using Structs to Structure Related Data</a></li><li><ol class="section"><li class="expanded "><a href="ch05-01-defining-structs.html"><strong aria-hidden="true">5.1.</strong> Defining and Instantiating Structs</a></li><li class="expanded "><a href="ch05-02-example-structs.html"><strong aria-hidden="true">5.2.</strong> An Example Program Using Structs</a></li><li class="expanded "><a href="ch05-03-method-syntax.html"><strong aria-hidden="true">5.3.</strong> Method Syntax</a></li></ol></li><li class="expanded "><a href="ch06-00-enums.html"><strong aria-hidden="true">6.</strong> Enums and Pattern Matching</a></li><li><ol class="section"><li class="expanded "><a href="ch06-01-defining-an-enum.html"><strong aria-hidden="true">6.1.</strong> Defining an Enum</a></li><li class="expanded "><a href="ch06-02-match.html"><strong aria-hidden="true">6.2.</strong> The match Control Flow Operator</a></li><li class="expanded "><a href="ch06-03-if-let.html"><strong aria-hidden="true">6.3.</strong> Concise Control Flow with if let</a></li></ol></li><li class="expanded "><a href="ch07-00-managing-growing-projects-with-packages-crates-and-modules.html"><strong aria-hidden="true">7.</strong> Managing Growing Projects with Packages, Crates, and Modules</a></li><li><ol class="section"><li class="expanded "><a href="ch07-01-packages-and-crates.html"><strong aria-hidden="true">7.1.</strong> Packages and Crates</a></li><li class="expanded "><a href="ch07-02-defining-modules-to-control-scope-and-privacy.html"><strong aria-hidden="true">7.2.</strong> Defining Modules to Control Scope and Privacy</a></li><li class="expanded "><a href="ch07-03-paths-for-referring-to-an-item-in-the-module-tree.html"><
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<main>
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<h2><a class="header" href="#customizing-builds-with-release-profiles" id="customizing-builds-with-release-profiles">Customizing Builds with Release Profiles</a></h2>
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<p>In Rust, <em>release profiles</em> are predefined and customizable profiles with
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different configurations that allow a programmer to have more control over
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various options for compiling code. Each profile is configured independently of
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the others.</p>
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<p>Cargo has two main profiles: the <code>dev</code> profile Cargo uses when you run <code>cargo build</code> and the <code>release</code> profile Cargo uses when you run <code>cargo build --release</code>. The <code>dev</code> profile is defined with good defaults for development,
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and the <code>release</code> profile has good defaults for release builds.</p>
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<p>These profile names might be familiar from the output of your builds:</p>
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<pre><code class="language-text">$ cargo build
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Finished dev [unoptimized + debuginfo] target(s) in 0.0 secs
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$ cargo build --release
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Finished release [optimized] target(s) in 0.0 secs
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</code></pre>
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<p>The <code>dev</code> and <code>release</code> shown in this build output indicate that the compiler
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is using different profiles.</p>
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<p>Cargo has default settings for each of the profiles that apply when there
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aren’t any <code>[profile.*]</code> sections in the project’s <em>Cargo.toml</em> file. By adding
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<code>[profile.*]</code> sections for any profile you want to customize, you can override
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any subset of the default settings. For example, here are the default values
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for the <code>opt-level</code> setting for the <code>dev</code> and <code>release</code> profiles:</p>
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<p><span class="filename">Filename: 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>The <code>opt-level</code> setting controls the number of optimizations Rust will apply to
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your code, with a range of 0 to 3. Applying more optimizations extends
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compiling time, so if you’re in development and compiling your code often,
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you’ll want faster compiling even if the resulting code runs slower. That is
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the reason the default <code>opt-level</code> for <code>dev</code> is <code>0</code>. When you’re ready to
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release your code, it’s best to spend more time compiling. You’ll only compile
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in release mode once, but you’ll run the compiled program many times, so
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release mode trades longer compile time for code that runs faster. That is why
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the default <code>opt-level</code> for the <code>release</code> profile is <code>3</code>.</p>
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<p>You can override any default setting by adding a different value for it in
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<em>Cargo.toml</em>. For example, if we want to use optimization level 1 in the
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development profile, we can add these two lines to our project’s <em>Cargo.toml</em>
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file:</p>
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<p><span class="filename">Filename: 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>This code overrides the default setting of <code>0</code>. Now when we run <code>cargo build</code>,
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Cargo will use the defaults for the <code>dev</code> profile plus our customization to
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<code>opt-level</code>. Because we set <code>opt-level</code> to <code>1</code>, Cargo will apply more
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optimizations than the default, but not as many as in a release build.</p>
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<p>For the full list of configuration options and defaults for each profile, see
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<a href="https://doc.rust-lang.org/cargo/reference/manifest.html#the-profile-sections">Cargo’s documentation</a>.</p>
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<script src="highlight.js" type="text/javascript" charset="utf-8"></script>
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<script src="book.js" type="text/javascript" charset="utf-8"></script>
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<script type="text/javascript" src="ferris.js"></script>
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</body>
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</html>
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