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<h1 id="seo-header">Rust 初体验</h1>
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<p>近日，在安装<code>某ss-rust</code>时，发现要在Debian上可选安装方式有<code>snap</code>和<code>cargo</code>。</p>
<p>由于众所周知的snap稳定性，还是选择cargo进行后续操作。</p>
<p>不熟悉的领域总会出错，本次cargo的安装固然不是一帆风顺。</p>
<span id="more"></span>
<h2 id="安装-Cargo"><a href="#安装-Cargo" class="headerlink" title="安装 Cargo"></a>安装 Cargo</h2><p>根据文档<a target="_blank" rel="noopener" href="https://doc.rust-lang.org/cargo/" title="Rust Cargo">1</a>，安装cargo似乎非常简单，只需要执行下面这一段指令确认结果就可以了。</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><code class="hljs shell"><span class="hljs-meta prompt_">$ </span><span class="language-bash">curl https://sh.rustup.rs -sSf | sh</span><br></code></pre></td></tr></table></figure>
<p>但实际上，安装结果确实符合官网所描述的 <code>Rust is installed now. Great!</code>。</p>
<figure class="highlight text"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br></pre></td><td class="code"><pre><code class="hljs text">info: downloading installer<br><br>Welcome to Rust!<br><br>This will download and install the official compiler for the Rust<br>programming language, and its package manager, Cargo.<br><br>Rustup metadata and toolchains will be installed into the Rustup<br>home directory, located at:<br><br> /root/.rustup<br><br>This can be modified with the RUSTUP_HOME environment variable.<br><br>The Cargo home directory is located at:<br><br> /root/.cargo<br><br>This can be modified with the CARGO_HOME environment variable.<br><br>The cargo, rustc, rustup and other commands will be added to<br>Cargo's bin directory, located at:<br><br> /root/.cargo/bin<br><br>This path will then be added to your PATH environment variable by<br>modifying the profile files located at:<br><br> /root/.profile<br> /root/.bashrc<br><br>You can uninstall at any time with rustup self uninstall and<br>these changes will be reverted.<br><br>Current installation options:<br><br><br> default host triple: x86_64-unknown-linux-gnu<br> default toolchain: stable (default)<br> profile: default<br> modify PATH variable: yes<br><br>1) Proceed with installation (default)<br>2) Customize installation<br>3) Cancel installation<br><br>><br><br>info: profile set to 'default'<br>info: default host triple is x86_64-unknown-linux-gnu<br>warning: Updating existing toolchain, profile choice will be ignored<br>info: syncing channel updates for 'stable-x86_64-unknown-linux-gnu'<br>info: default toolchain set to 'stable-x86_64-unknown-linux-gnu'<br><br> stable-x86_64-unknown-linux-gnu unchanged - rustc 1.71.1 (eb26296b5 2023-08-03)<br><br><br>Rust is installed now. Great!<br><br>To get started you may need to restart your current shell.<br>This would reload your PATH environment variable to include<br>Cargo's bin directory ($HOME/.cargo/bin).<br><br>To configure your current shell, run:<br>source "$HOME/.cargo/env"<br></code></pre></td></tr></table></figure>
<h2 id="问题在哪"><a href="#问题在哪" class="headerlink" title="问题在哪"></a>问题在哪</h2><p>安装 Cargo 后，我们根据文档执行<code>cargo new hello_world</code>，似乎没什么问题。</p>
<p>但是执行构建指令后，问题显然就发生了。这是由于没有安装编译器。（在纯净环境下总是会忘记装编译环境）</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><code class="hljs shell"><span class="hljs-meta prompt_">$ </span><span class="language-bash">cargo build</span><br> Compiling hello_world v0.1.0 (/root/hello_world)<br>error: linker `cc` not found<br> |<br> = note: No such file or directory (os error 2)<br><br>error: could not compile `hello_world` (bin "hello_world") due to previous error<br></code></pre></td></tr></table></figure>
<p>在Debian环境下，使用APT包管理器安装编译器的简易方式如下</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><code class="hljs shell"><span class="hljs-meta prompt_">$ </span><span class="language-bash">apt install build-essential</span><br></code></pre></td></tr></table></figure>
<h2 id="大功告成"><a href="#大功告成" class="headerlink" title="大功告成"></a>大功告成</h2><p>构建Rust应用程序。</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><code class="hljs shell"><span class="hljs-meta prompt_">$ </span><span class="language-bash">cargo build</span><br> Compiling hello_world v0.1.0 (/root/hello_world)<br> Finished dev [unoptimized + debuginfo] target(s) in 0.27s<br></code></pre></td></tr></table></figure>
<p>执行应用程序。</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><code class="hljs shell"><span class="hljs-meta prompt_">$ </span><span class="language-bash">cargo run</span><br> Finished dev [unoptimized + debuginfo] target(s) in 0.00s<br> Running `target/debug/hello_world`<br>Hello, world!<br></code></pre></td></tr></table></figure>
<p>你好Rust世界！</p>
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