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| <section id="cross-compiling-for-webassembly-with-emscripten"> |
| <span id="developers-cpp-emscripten"></span><h1>Cross compiling for WebAssembly with Emscripten<a class="headerlink" href="#cross-compiling-for-webassembly-with-emscripten" title="Permalink to this heading">#</a></h1> |
| <section id="prerequisites"> |
| <h2>Prerequisites<a class="headerlink" href="#prerequisites" title="Permalink to this heading">#</a></h2> |
| <p>You need CMake and compilers etc. installed as per the normal build instructions. Before building with Emscripten, you also need to install Emscripten and |
| activate it using the commands below (see <a class="reference external" href="https://emscripten.org/docs/getting_started/downloads.html">https://emscripten.org/docs/getting_started/downloads.html</a> for details).</p> |
| <div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>git<span class="w"> </span>clone<span class="w"> </span>https://github.com/emscripten-core/emsdk.git |
| <span class="nb">cd</span><span class="w"> </span>emsdk |
| <span class="c1"># replace <version> with the desired EMSDK version.</span> |
| <span class="c1"># e.g. for Pyodide 0.24, you need EMSDK version 3.1.45</span> |
| ./emsdk<span class="w"> </span>install<span class="w"> </span><version> |
| ./emsdk<span class="w"> </span>activate<span class="w"> </span><version> |
| <span class="nb">source</span><span class="w"> </span>./emsdk_env.sh |
| </pre></div> |
| </div> |
| <p>If you want to build PyArrow for <a class="reference external" href="https://pyodide.org">Pyodide</a>, you |
| need <code class="docutils literal notranslate"><span class="pre">pyodide-build</span></code> installed via <code class="docutils literal notranslate"><span class="pre">pip</span></code>, and to be running with the |
| same version of Python that Pyodide is built for, along with the same |
| versions of emsdk tools.</p> |
| <div class="highlight-shell notranslate"><div class="highlight"><pre><span></span><span class="c1"># install Pyodide build tools.</span> |
| <span class="c1"># e.g. for version 0.24 of Pyodide:</span> |
| pip<span class="w"> </span>install<span class="w"> </span>pyodide-build<span class="o">==</span><span class="m">0</span>.24 |
| </pre></div> |
| </div> |
| <p>Then build with the <code class="docutils literal notranslate"><span class="pre">ninja-release-emscripten</span></code> CMake preset, |
| like below:</p> |
| <div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>emcmake<span class="w"> </span>cmake<span class="w"> </span>--preset<span class="w"> </span><span class="s2">"ninja-release-emscripten"</span> |
| ninja<span class="w"> </span>install |
| </pre></div> |
| </div> |
| <p>This will install a built static library version of <code class="docutils literal notranslate"><span class="pre">libarrow</span></code> it into the |
| Emscripten sysroot cache, meaning you can build things that depend on it |
| and they will find <code class="docutils literal notranslate"><span class="pre">libarrow</span></code>.</p> |
| <p>e.g. if you want to build for Pyodide, run the commands above, and then |
| go to <code class="docutils literal notranslate"><span class="pre">arrow/python</span></code> and run</p> |
| <div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>pyodide<span class="w"> </span>build |
| </pre></div> |
| </div> |
| <p>It should make a wheel targeting the currently enabled version of |
| Pyodide (i.e. the version corresponding to the currently installed |
| <code class="docutils literal notranslate"><span class="pre">pyodide-build</span></code>) in the <code class="docutils literal notranslate"><span class="pre">dist</span></code> subdirectory.</p> |
| </section> |
| <section id="manual-build"> |
| <h2>Manual Build<a class="headerlink" href="#manual-build" title="Permalink to this heading">#</a></h2> |
| <p>If you want to manually build for Emscripten, take a look at the |
| <code class="docutils literal notranslate"><span class="pre">CMakePresets.json</span></code> file in the <code class="docutils literal notranslate"><span class="pre">arrow/cpp</span></code> directory for a list of things |
| you will need to override. In particular you will need:</p> |
| <ol class="arabic simple"> |
| <li><p>Build dependencies set to <code class="docutils literal notranslate"><span class="pre">BUNDLED</span></code>, so it uses properly cross |
| compiled build dependencies.</p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">CMAKE_TOOLCHAIN_FILE</span></code> set by using <code class="docutils literal notranslate"><span class="pre">emcmake</span> <span class="pre">cmake</span></code> instead of just <code class="docutils literal notranslate"><span class="pre">cmake</span></code>.</p></li> |
| <li><p>You will quite likely need to set <code class="docutils literal notranslate"><span class="pre">ARROW_ENABLE_THREADING</span></code> to <code class="docutils literal notranslate"><span class="pre">OFF</span></code> |
| for builds targeting single threaded Emscripten environments such as |
| Pyodide.</p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">ARROW_FLIGHT</span></code> and anything else that uses network probably won’t |
| work.</p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">ARROW_JEMALLOC</span></code> and <code class="docutils literal notranslate"><span class="pre">ARROW_MIMALLOC</span></code> again probably need to be |
| <code class="docutils literal notranslate"><span class="pre">OFF</span></code></p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">ARROW_BUILD_STATIC</span></code> set to <code class="docutils literal notranslate"><span class="pre">ON</span></code> and <code class="docutils literal notranslate"><span class="pre">ARROW_BUILD_SHARED</span></code> set to |
| <code class="docutils literal notranslate"><span class="pre">OFF</span></code> is most likely to work.</p></li> |
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