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| Building other Arrow libraries |
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| |
| <section id="building-the-arrow-libraries"> |
| <span id="build-arrow-guide"></span><h1>Building the Arrow libraries 🏋🏿♀️<a class="headerlink" href="#building-the-arrow-libraries" title="Permalink to this heading">¶</a></h1> |
| <p>The Arrow project contains a number of libraries that enable |
| work in many languages. Most libraries (C++, C#, Go, Java, |
| JavaScript, Julia, and Rust) already contain distinct implementations |
| of Arrow.</p> |
| <p>This is different for C (Glib), MATLAB, Python, R, and Ruby as they |
| are built on top of the C++ library. In this section of the guide |
| we will try to make a friendly introduction to the build, |
| dealing with some of these libraries as well has how they work with |
| the C++ library.</p> |
| <p>If you decide to contribute to Arrow you might need to compile the |
| C++ source code. This is done using a tool called CMake, which you |
| may or may not have experience with. If not, this section of the |
| guide will help you better understand CMake and the process |
| of building Arrow’s C++ code.</p> |
| <p>This content is intended to help explain the concepts related to |
| and tools required for building Arrow’s C++ library from source. |
| If you are looking for the specific required steps, or already feel comfortable |
| with compiling Arrow’s C++ library, then feel free to proceed |
| to the <a class="reference internal" href="../../cpp/building.html#building-arrow-cpp"><span class="std std-ref">C++</span></a>, <a class="reference internal" href="../../python.html#build-pyarrow"><span class="std std-ref">PyArrow</span></a> or |
| <a class="reference external" href="https://arrow.apache.org/docs/r/articles/developing.html">R package build section</a>.</p> |
| <section id="building-arrow-c"> |
| <h2>Building Arrow C++<a class="headerlink" href="#building-arrow-c" title="Permalink to this heading">¶</a></h2> |
| <section id="why-build-arrow-c-from-source"> |
| <h3>Why build Arrow C++ from source?<a class="headerlink" href="#why-build-arrow-c-from-source" title="Permalink to this heading">¶</a></h3> |
| <p>For Arrow implementations which are built on top of the C++ implementation |
| (e.g. Python and R), wrappers and interfaces have been written to the |
| underlying C++ functions. If you want to work on PyArrow or the R package, |
| you may need to edit the source code of the C++ library too.</p> |
| <p>Detailed instructions on building C++ library from source can |
| be found <a class="reference internal" href="../../cpp/building.html#building-arrow-cpp"><span class="std std-ref">here</span></a>.</p> |
| </section> |
| <section id="about-cmake"> |
| <h3>About CMake<a class="headerlink" href="#about-cmake" title="Permalink to this heading">¶</a></h3> |
| <p>CMake is a cross-platform build system generator and it defers |
| to another program such as <code class="docutils literal notranslate"><span class="pre">make</span></code> or <code class="docutils literal notranslate"><span class="pre">ninja</span></code> for the actual build. |
| If you are running into errors with the build process, the first thing to |
| do is to look at the error message thoroughly and check the building |
| documentation for any similar error advice. Also changing the CMake flags |
| for compiling Arrow could be useful.</p> |
| <section id="cmake-presets"> |
| <h4>CMake presets<a class="headerlink" href="#cmake-presets" title="Permalink to this heading">¶</a></h4> |
| <p>You could also try to build with CMake presets which are a collection of |
| build and test recipes for Arrow’s CMake. They are a very useful |
| starting points.</p> |
| <p>More detailed information about CMake presets can be found in |
| the <a class="reference internal" href="../../cpp/building.html#cmake-presets"><span class="std std-ref">CMake presets</span></a> section.</p> |
| </section> |
| <section id="optional-flags-and-environment-variables"> |
| <h4>Optional flags and environment variables<a class="headerlink" href="#optional-flags-and-environment-variables" title="Permalink to this heading">¶</a></h4> |
| <p>Flags used in the CMake build are used to include additional components |
| and to handle third-party dependencies. |
| The build for C++ library can be minimal with no use of flags or can |
| be changed with adding optional components from the |
| <a class="reference internal" href="../../cpp/building.html#cpp-build-optional-components"><span class="std std-ref">list</span></a>.</p> |
| <div class="admonition seealso"> |
| <p class="admonition-title">See also</p> |
| <p>Full list of optional flags: <a class="reference internal" href="../../cpp/building.html#cpp-build-optional-components"><span class="std std-ref">Optional Components</span></a></p> |
| </div> |
| <p>R and Python have specific lists of flags in their respective builds |
| that need to be included. You can find the links at the end |
| of this section.</p> |
| <p>In general on Python side, the options are set with CMake flags and |
| paths with environment variables. In R the environment variables are used |
| for all things connected to the build, also for setting CMake flags.</p> |
| </section> |
| </section> |
| </section> |
| <section id="building-other-arrow-libraries"> |
| <span id="build-libraries-guide"></span><h2>Building other Arrow libraries<a class="headerlink" href="#building-other-arrow-libraries" title="Permalink to this heading">¶</a></h2> |
| <div class="sd-tab-set docutils"> |
| <input checked="checked" id="sd-tab-item-0" name="sd-tab-set-0" type="radio"> |
| </input><label class="sd-tab-label" for="sd-tab-item-0"> |
| Building PyArrow</label><div class="sd-tab-content docutils"> |
| <p>After building the Arrow C++ library, you need to build PyArrow on top |
| of it also. The reason is the same; so you can edit the code and run |
| tests on the edited code you have locally.</p> |
| <p><strong>Why do we have to do builds separately?</strong></p> |
| <p>As mentioned at the beginning of this page, the Python part of the Arrow |
| project is built on top of the C++ library. In order to make changes in |
| the Python part of Arrow as well as the C++ part of Arrow, you need to |
| build them separately.</p> |
| <p>We hope this introduction was enough to help you start with the building |
| process.</p> |
| <div class="admonition seealso"> |
| <p class="admonition-title">See also</p> |
| <p>Follow the instructions to build PyArrow together with the C++ library</p> |
| <ul class="simple"> |
| <li><p><a class="reference internal" href="../../python.html#build-pyarrow"><span class="std std-ref">Building on Linux and macOS</span></a></p></li> |
| </ul> |
| <p>Or</p> |
| <ul class="simple"> |
| <li><p><a class="reference internal" href="../../python.html#build-pyarrow-win"><span class="std std-ref">Building on Windows</span></a></p></li> |
| </ul> |
| </div> |
| <p>When you will make change to the code, you may need to recompile |
| PyArrow or Arrow C++:</p> |
| <p><strong>Recompiling Cython</strong></p> |
| <p>If you only make changes to <code class="docutils literal notranslate"><span class="pre">.py</span></code> files, you do not need to |
| recompile PyArrow. However, you should recompile it if you make |
| changes in <code class="docutils literal notranslate"><span class="pre">.pyx</span></code> or <code class="docutils literal notranslate"><span class="pre">.pxd</span></code> files.</p> |
| <p>To do that run this command again:</p> |
| <div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>python<span class="w"> </span>setup.py<span class="w"> </span>build_ext<span class="w"> </span>--inplace |
| </pre></div> |
| </div> |
| <p><strong>Recompiling C++</strong></p> |
| <p>Similarly, you will need to recompile the C++ code if you have |
| made changes to any C++ files. In this case, |
| re-run the build commands again.</p> |
| </div> |
| <input id="sd-tab-item-1" name="sd-tab-set-0" type="radio"> |
| </input><label class="sd-tab-label" for="sd-tab-item-1"> |
| Building the R package</label><div class="sd-tab-content docutils"> |
| <p>When working on code in the R package, depending on your OS and planned |
| changes, you may or may not need to build the Arrow C++ library (often |
| referred to in the R documentation as ‘libarrow’) from source.</p> |
| <p>More information on this and full instructions on setting up the Arrow C++ |
| library and Arrow R package can be found in the |
| <a class="reference external" href="https://arrow.apache.org/docs/r/articles/developing.html">R developer docs</a>.</p> |
| <p><strong>Reinstalling R package and running ‘make clean’</strong></p> |
| <p>If you make changes to the Arrow C++ part of the code, also |
| called libarrow, you will need to:</p> |
| <ol class="arabic simple"> |
| <li><p>reinstall libarrow,</p></li> |
| <li><p>run <code class="docutils literal notranslate"><span class="pre">make</span> <span class="pre">clean</span></code>,</p></li> |
| <li><p>reinstall the R package.</p></li> |
| </ol> |
| <p>The <code class="docutils literal notranslate"><span class="pre">make</span> <span class="pre">clean</span></code> function is defined in <code class="docutils literal notranslate"><span class="pre">r/Makefile</span></code> and will |
| remove any cached object code in the <code class="docutils literal notranslate"><span class="pre">r/src/</span></code> directory, ensuring |
| you have a clean reinstall. The <code class="docutils literal notranslate"><span class="pre">Makefile</span></code> also includes functions |
| like <code class="docutils literal notranslate"><span class="pre">make</span> <span class="pre">test</span></code>, <code class="docutils literal notranslate"><span class="pre">make</span> <span class="pre">doc</span></code>, etc. and was added to help with |
| common tasks from the command line.</p> |
| <p>See more in the <a class="reference external" href="https://arrow.apache.org/docs/dev/r/articles/developers/setup.html#troubleshooting">Troubleshooting</a> |
| section of the R Developer environment setup article.</p> |
| </div> |
| </div> |
| <p><strong>Building from source vs. using binaries</strong></p> |
| <p>Using binaries is a fast and simple way of working with the last release |
| of Arrow. However, if you use these it means that you will be unable to |
| make changes to the Arrow C++ library.</p> |
| <div class="admonition note"> |
| <p class="admonition-title">Note</p> |
| <p>Every language has its own way of dealing with binaries. |
| To get more information navigate to the section of the language you are |
| interested to find more information.</p> |
| </div> |
| </section> |
| </section> |
| |
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