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<article class="bd-article">
<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>
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