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<h1 id="swift">Swift</h1>
<p>The Swift compiler is provided by the <code>swift</code> package:</p>
<div class="highlight"><pre><span></span><code><span class="c1"># Compile and link a simple executable.</span>
nix-shell<span class="w"> </span>-p<span class="w"> </span>swift<span class="w"> </span>--run<span class="w"> </span><span class="s1">&#39;swiftc -&#39;</span><span class="w"> </span><span class="o">&lt;&lt;&lt;</span><span class="w"> </span><span class="s1">&#39;print(&quot;Hello world!&quot;)&#39;</span>
<span class="c1"># Run it!</span>
./main
</code></pre></div>
<p>The <code>swift</code> package also provides the <code>swift</code> command, with some caveats:</p>
<ul>
<li>Swift Package Manager (SwiftPM) is packaged separately as <code>swiftpm</code>. If you
need functionality like <code>swift build</code>, <code>swift run</code>, <code>swift test</code>, you must
also add the <code>swiftpm</code> package to your closure.</li>
<li>On Darwin, the <code>swift repl</code> command requires an Xcode installation. This is
because it uses the system LLDB debugserver, which has special entitlements.</li>
</ul>
<h2 id="ssec-swift-module-search-paths">Module search paths</h2>
<p>Like other toolchains in Nixpkgs, the Swift compiler executables are wrapped
to help Swift find your application's dependencies in the Nix store. These
wrappers scan the <code>buildInputs</code> of your package derivation for specific
directories where Swift modules are placed by convention, and automatically
add those directories to the Swift compiler search paths.</p>
<p>Swift follows different conventions depending on the platform. The wrappers
look for the following directories:</p>
<ul>
<li>On Darwin platforms: <code>lib/swift/macosx</code>
(If not targeting macOS, replace <code>macosx</code> with the Xcode platform name.)</li>
<li>On other platforms: <code>lib/swift/linux/x86_64</code>
(Where <code>linux</code> and <code>x86_64</code> are from lowercase <code>uname -sm</code>.)</li>
<li>For convenience, Nixpkgs also adds <code>lib/swift</code> to the search path.
This can save a bit of work packaging Swift modules, because many Nix builds
will produce output for just one target any way.</li>
</ul>
<h2 id="ssec-swift-core-libraries">Core libraries</h2>
<p>In addition to the standard library, the Swift toolchain contains some
additional 'core libraries' that, on Apple platforms, are normally distributed
as part of the OS or Xcode. These are packaged separately in Nixpkgs, and can
be found (for use in <code>buildInputs</code>) as:</p>
<ul>
<li><code>swiftPackages.Dispatch</code></li>
<li><code>swiftPackages.Foundation</code></li>
<li><code>swiftPackages.XCTest</code></li>
</ul>
<h2 id="ssec-swift-packaging-with-swiftpm">Packaging with SwiftPM</h2>
<p>Nixpkgs includes a small helper <code>swiftpm2nix</code> that can fetch your SwiftPM
dependencies for you, when you need to write a Nix expression to package your
application.</p>
<p>The first step is to run the generator:</p>
<div class="highlight"><pre><span></span><code><span class="nb">cd</span><span class="w"> </span>/path/to/my/project
<span class="c1"># Enter a Nix shell with the required tools.</span>
nix-shell<span class="w"> </span>-p<span class="w"> </span>swift<span class="w"> </span>swiftpm<span class="w"> </span>swiftpm2nix
<span class="c1"># First, make sure the workspace is up-to-date.</span>
swift<span class="w"> </span>package<span class="w"> </span>resolve
<span class="c1"># Now generate the Nix code.</span>
swiftpm2nix
</code></pre></div>
<p>This produces some files in a directory <code>nix</code>, which will be part of your Nix
expression. The next step is to write that expression:</p>
<div class="highlight"><pre><span></span><code><span class="p">{</span> stdenv<span class="p">,</span> swift<span class="p">,</span> swiftpm<span class="p">,</span> swiftpm2nix<span class="p">,</span> fetchFromGitHub <span class="p">}:</span>
<span class="k">let</span>
<span class="c1"># Pass the generated files to the helper.</span>
<span class="ss">generated</span> <span class="o">=</span> swiftpm2nix<span class="o">.</span>helpers <span class="l">./nix</span><span class="p">;</span>
<span class="k">in</span>
stdenv<span class="o">.</span>mkDerivation <span class="k">rec</span> <span class="p">{</span>
<span class="ss">pname</span> <span class="o">=</span> <span class="s2">&quot;myproject&quot;</span><span class="p">;</span>
<span class="ss">version</span> <span class="o">=</span> <span class="s2">&quot;0.0.0&quot;</span><span class="p">;</span>
<span class="ss">src</span> <span class="o">=</span> fetchFromGitHub <span class="p">{</span>
<span class="ss">owner</span> <span class="o">=</span> <span class="s2">&quot;nixos&quot;</span><span class="p">;</span>
<span class="ss">repo</span> <span class="o">=</span> pname<span class="p">;</span>
<span class="ss">rev</span> <span class="o">=</span> version<span class="p">;</span>
<span class="ss">hash</span> <span class="o">=</span> <span class="s2">&quot;sha256-AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=&quot;</span><span class="p">;</span>
<span class="p">};</span>
<span class="c1"># Including SwiftPM as a nativeBuildInput provides a buildPhase for you.</span>
<span class="c1"># This by default performs a release build using SwiftPM, essentially:</span>
<span class="c1"># swift build -c release</span>
<span class="ss">nativeBuildInputs</span> <span class="o">=</span> <span class="p">[</span> swift swiftpm <span class="p">];</span>
<span class="c1"># The helper provides a configure snippet that will prepare all dependencies</span>
<span class="c1"># in the correct place, where SwiftPM expects them.</span>
<span class="ss">configurePhase</span> <span class="o">=</span> generated<span class="o">.</span>configure<span class="p">;</span>
<span class="ss">installPhase</span> <span class="o">=</span> <span class="s s-Multiline">&#39;&#39;</span>
<span class="s s-Multiline"> # This is a special function that invokes swiftpm to find the location</span>
<span class="s s-Multiline"> # of the binaries it produced.</span>
<span class="s s-Multiline"> binPath=&quot;$(swiftpmBinPath)&quot;</span>
<span class="s s-Multiline"> # Now perform any installation steps.</span>
<span class="s s-Multiline"> mkdir -p $out/bin</span>
<span class="s s-Multiline"> cp $binPath/myproject $out/bin/</span>
<span class="s s-Multiline"> &#39;&#39;</span><span class="p">;</span>
<span class="p">}</span>
</code></pre></div>
<h3 id="ssec-swiftpm-custom-build-flags">Custom build flags</h3>
<p>If you'd like to build a different configuration than <code>release</code>:</p>
<div class="highlight"><pre><span></span><code><span class="p">{</span>
<span class="ss">swiftpmBuildConfig</span> <span class="o">=</span> <span class="s2">&quot;debug&quot;</span><span class="p">;</span>
<span class="p">}</span>
</code></pre></div>
<p>It is also possible to provide additional flags to <code>swift build</code>:</p>
<div class="highlight"><pre><span></span><code><span class="p">{</span>
<span class="ss">swiftpmFlags</span> <span class="o">=</span> <span class="p">[</span> <span class="s2">&quot;--disable-dead-strip&quot;</span> <span class="p">];</span>
<span class="p">}</span>
</code></pre></div>
<p>The default <code>buildPhase</code> already passes <code>-j</code> for parallel building.</p>
<p>If these two customization options are insufficient, provide your own
<code>buildPhase</code> that invokes <code>swift build</code>.</p>
<h3 id="ssec-swiftpm-running-tests">Running tests</h3>
<p>Including <code>swiftpm</code> in your <code>nativeBuildInputs</code> also provides a default
<code>checkPhase</code>, but it must be enabled with:</p>
<div class="highlight"><pre><span></span><code><span class="p">{</span>
<span class="ss">doCheck</span> <span class="o">=</span> <span class="no">true</span><span class="p">;</span>
<span class="p">}</span>
</code></pre></div>
<p>This essentially runs: <code>swift test -c release</code></p>
<h3 id="ssec-swiftpm-patching-dependencies">Patching dependencies</h3>
<p>In some cases, it may be necessary to patch a SwiftPM dependency. SwiftPM
dependencies are located in <code>.build/checkouts</code>, but the <code>swiftpm2nix</code> helper
provides these as symlinks to read-only <code>/nix/store</code> paths. In order to patch
them, we need to make them writable.</p>
<p>A special function <code>swiftpmMakeMutable</code> is available to replace the symlink
with a writable copy:</p>
<div class="highlight"><pre><span></span><code><span class="p">{</span>
<span class="ss">configurePhase</span> <span class="o">=</span> generated<span class="o">.</span>configure <span class="o">++</span> <span class="s s-Multiline">&#39;&#39;</span>
<span class="s s-Multiline"> # Replace the dependency symlink with a writable copy.</span>
<span class="s s-Multiline"> swiftpmMakeMutable swift-crypto</span>
<span class="s s-Multiline"> # Now apply a patch.</span>
<span class="s s-Multiline"> patch -p1 -d .build/checkouts/swift-crypto -i </span><span class="si">${</span><span class="l">./some-fix.patch</span><span class="si">}</span>
<span class="s s-Multiline"> &#39;&#39;</span><span class="p">;</span>
<span class="p">}</span>
</code></pre></div>
<h2 id="ssec-swift-considerations-for-custom-build-tools">Considerations for custom build tools</h2>
<h3 id="ssec-swift-linking-the-standard-library">Linking the standard library</h3>
<p>The <code>swift</code> package has a separate <code>lib</code> output containing just the Swift
standard library, to prevent Swift applications needing a dependency on the
full Swift compiler at run-time. Linking with the Nixpkgs Swift toolchain
already ensures binaries correctly reference the <code>lib</code> output.</p>
<p>Sometimes, Swift is used only to compile part of a mixed codebase, and the
link step is manual. Custom build tools often locate the standard library
relative to the <code>swift</code> compiler executable, and while the result will work,
when this path ends up in the binary, it will have the Swift compiler as an
unintended dependency.</p>
<p>In this case, you should investigate how your build process discovers the
standard library, and override the path. The correct path will be something
like: <code>"${swift.swift.lib}/${swift.swiftModuleSubdir}"</code></p>
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