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<section id="integration-with-build-systems-written-in-python">
<h1>Integration with build systems written in Python<a class="headerlink" href="#integration-with-build-systems-written-in-python" title="Permalink to this heading">¶</a></h1>
<p>Besides the build systems commonly used by Python packages there are
a few build systems written in Python and requiring the packages
to script them in Python. This makes it necessary to use a proper
Python eclass in order to declare their compatibility with Python
versions.</p>
<section id="meson">
<h2>Meson<a class="headerlink" href="#meson" title="Permalink to this heading">¶</a></h2>
<p><a class="reference external" href="https://mesonbuild.com/">Meson</a> build system is a fairly recent addition. While it is written
in Python, its scripts use a custom Python-agnostic script language.
Hence, it can be treated as an arbitrary external tool and does not need
any Python eclass.</p>
</section>
<section id="scons">
<h2>SCons<a class="headerlink" href="#scons" title="Permalink to this heading">¶</a></h2>
<p><a class="reference external" href="https://scons.org/">SCons</a> has gained Python 3 support quite recently. At the same time,
many old script files were written for Python 2 and fail when run
via Python 3 SCons. For this reason, it is necessary to use Python
eclass when using SCons.</p>
<p>In the simplest case when the package has no other use for Python,
it is sufficient to declare <code class="docutils literal notranslate"><span class="pre">PYTHON_COMPAT</span></code> for the SCons scripts
in the package, and inherit <code class="docutils literal notranslate"><span class="pre">python-any-r1</span></code> prior to <code class="docutils literal notranslate"><span class="pre">scons-utils</span></code>
(this happens naturally when you sort includes by eclass name).
The latter eclass takes care of setting as much as possible.</p>
<p>If the package has other Python components, it is necessary to account
for them and use an appropriate eclass as detailed in the eclass choice
chapter.</p>
<section id="build-time-use-with-no-extra-dependencies">
<h3>Build-time use with no extra dependencies<a class="headerlink" href="#build-time-use-with-no-extra-dependencies" title="Permalink to this heading">¶</a></h3>
<p>If the package either has no other Python components than SCons, or all
of them are purely build-time and have no dependencies, it is sufficient
to inherit <code class="docutils literal notranslate"><span class="pre">python-any-r1</span></code>. The eclass takes care of setting
<code class="docutils literal notranslate"><span class="pre">BDEPEND</span></code> along with matching <code class="docutils literal notranslate"><span class="pre">python_check_deps()</span></code>.</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span><span class="w"> </span><span class="c1"># Copyright 1999-2020 Gentoo Authors</span>
<span class="w"> </span><span class="c1"># Distributed under the terms of the GNU General Public License v2</span>
<span class="w"> </span><span class="nv">EAPI</span><span class="o">=</span><span class="m">7</span>
<span class="hll"><span class="w"> </span><span class="nv">PYTHON_COMPAT</span><span class="o">=(</span><span class="w"> </span>python3_<span class="o">{</span><span class="m">6</span>,7<span class="o">}</span><span class="w"> </span><span class="o">)</span>
</span><span class="hll"><span class="w"> </span>inherit<span class="w"> </span>python-any-r1<span class="w"> </span>scons-utils<span class="w"> </span>toolchain-funcs
</span>
<span class="w"> </span><span class="nv">COMMIT</span><span class="o">=</span><span class="s2">"6e5e8a57628095d8d0c8bbb38187afb0f3a42112"</span>
<span class="w"> </span><span class="nv">DESCRIPTION</span><span class="o">=</span><span class="s2">"Userspace Xbox 360 Controller driver"</span>
<span class="w"> </span><span class="nv">HOMEPAGE</span><span class="o">=</span><span class="s2">"https://xboxdrv.gitlab.io"</span>
<span class="w"> </span><span class="nv">SRC_URI</span><span class="o">=</span><span class="s2">"https://github.com/chewi/xboxdrv/archive/</span><span class="si">${</span><span class="nv">COMMIT</span><span class="si">}</span><span class="s2">.tar.gz -> </span><span class="si">${</span><span class="nv">P</span><span class="si">}</span><span class="s2">.tar.gz"</span>
<span class="w"> </span><span class="nv">S</span><span class="o">=</span><span class="s2">"</span><span class="si">${</span><span class="nv">WORKDIR</span><span class="si">}</span><span class="s2">/</span><span class="si">${</span><span class="nv">PN</span><span class="si">}</span><span class="s2">-</span><span class="si">${</span><span class="nv">COMMIT</span><span class="si">}</span><span class="s2">"</span>
<span class="w"> </span><span class="nv">LICENSE</span><span class="o">=</span><span class="s2">"GPL-3"</span>
<span class="w"> </span><span class="nv">SLOT</span><span class="o">=</span><span class="s2">"0"</span>
<span class="w"> </span><span class="nv">KEYWORDS</span><span class="o">=</span><span class="s2">"~amd64 ~x86"</span>
<span class="w"> </span><span class="nv">RDEPEND</span><span class="o">=</span><span class="s2">"</span>
<span class="s2"> dev-libs/boost:=</span>
<span class="s2"> dev-libs/dbus-glib</span>
<span class="s2"> dev-libs/glib:2</span>
<span class="s2"> sys-apps/dbus</span>
<span class="s2"> virtual/libudev:=</span>
<span class="s2"> virtual/libusb:1</span>
<span class="s2"> x11-libs/libX11</span>
<span class="s2"> "</span>
<span class="w"> </span><span class="nv">DEPEND</span><span class="o">=</span><span class="s2">"</span>
<span class="s2"> </span><span class="si">${</span><span class="nv">RDEPEND</span><span class="si">}</span>
<span class="s2"> "</span>
<span class="w"> </span><span class="nv">BDEPEND</span><span class="o">=</span><span class="s2">"</span>
<span class="s2"> dev-util/glib-utils</span>
<span class="s2"> virtual/pkgconfig</span>
<span class="s2"> "</span>
<span class="w"> </span>src_compile<span class="o">()</span><span class="w"> </span><span class="o">{</span>
<span class="w"> </span>escons<span class="w"> </span><span class="se">\</span>
<span class="w"> </span><span class="nv">BUILD</span><span class="o">=</span>custom<span class="w"> </span><span class="se">\</span>
<span class="w"> </span><span class="nv">CXX</span><span class="o">=</span><span class="s2">"</span><span class="k">$(</span>tc-getCXX<span class="k">)</span><span class="s2">"</span><span class="w"> </span><span class="se">\</span>
<span class="w"> </span><span class="nv">AR</span><span class="o">=</span><span class="s2">"</span><span class="k">$(</span>tc-getAR<span class="k">)</span><span class="s2">"</span><span class="w"> </span><span class="se">\</span>
<span class="w"> </span><span class="nv">RANLIB</span><span class="o">=</span><span class="s2">"</span><span class="k">$(</span>tc-getRANLIB<span class="k">)</span><span class="s2">"</span><span class="w"> </span><span class="se">\</span>
<span class="w"> </span><span class="nv">CXXFLAGS</span><span class="o">=</span><span class="s2">"-Wall </span><span class="si">${</span><span class="nv">CXXFLAGS</span><span class="si">}</span><span class="s2">"</span><span class="w"> </span><span class="se">\</span>
<span class="w"> </span><span class="nv">LINKFLAGS</span><span class="o">=</span><span class="s2">"</span><span class="si">${</span><span class="nv">LDFLAGS</span><span class="si">}</span><span class="s2">"</span>
<span class="w"> </span><span class="o">}</span>
<span class="w"> </span>src_install<span class="o">()</span><span class="w"> </span><span class="o">{</span>
<span class="w"> </span>dobin<span class="w"> </span>xboxdrv
<span class="w"> </span>doman<span class="w"> </span>doc/xboxdrv.1
<span class="w"> </span>dodoc<span class="w"> </span>AUTHORS<span class="w"> </span>NEWS<span class="w"> </span>PROTOCOL<span class="w"> </span>README.md<span class="w"> </span>TODO
<span class="w"> </span><span class="o">}</span>
</pre></div>
</div>
</section>
<section id="build-time-use-with-extra-dependencies">
<h3>Build-time use with extra dependencies<a class="headerlink" href="#build-time-use-with-extra-dependencies" title="Permalink to this heading">¶</a></h3>
<p>If the package has extra dependencies, you need to take care of <em>all</em>
dependencies yourself. This is because <code class="docutils literal notranslate"><span class="pre">python_gen_any_dep</span></code> cannot
be combined.</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span><span class="w"> </span><span class="c1"># Copyright 1999-2020 Gentoo Authors</span>
<span class="w"> </span><span class="c1"># Distributed under the terms of the GNU General Public License v2</span>
<span class="w"> </span><span class="nv">EAPI</span><span class="o">=</span><span class="m">7</span>
<span class="hll"><span class="w"> </span><span class="nv">PYTHON_COMPAT</span><span class="o">=(</span><span class="w"> </span>python3_<span class="o">{</span><span class="m">6</span>,7<span class="o">}</span><span class="w"> </span><span class="o">)</span>
</span><span class="hll"><span class="w"> </span>inherit<span class="w"> </span>python-any-r1<span class="w"> </span>scons-utils<span class="w"> </span>toolchain-funcs
</span>
<span class="w"> </span><span class="nv">MY_P</span><span class="o">=</span><span class="si">${</span><span class="nv">PN</span><span class="si">}</span>-src-r<span class="si">${</span><span class="nv">PV</span><span class="p">/_rc/-rc</span><span class="si">}</span>
<span class="w"> </span><span class="nv">DESCRIPTION</span><span class="o">=</span><span class="s2">"A high-performance, open source, schema-free document-oriented database"</span>
<span class="w"> </span><span class="nv">HOMEPAGE</span><span class="o">=</span><span class="s2">"https://www.mongodb.com"</span>
<span class="w"> </span><span class="nv">SRC_URI</span><span class="o">=</span><span class="s2">"https://fastdl.mongodb.org/src/</span><span class="si">${</span><span class="nv">MY_P</span><span class="si">}</span><span class="s2">.tar.gz"</span>
<span class="w"> </span><span class="nv">S</span><span class="o">=</span><span class="s2">"</span><span class="si">${</span><span class="nv">WORKDIR</span><span class="si">}</span><span class="s2">/</span><span class="si">${</span><span class="nv">MY_P</span><span class="si">}</span><span class="s2">"</span>
<span class="w"> </span><span class="nv">LICENSE</span><span class="o">=</span><span class="s2">"Apache-2.0 SSPL-1"</span>
<span class="w"> </span><span class="nv">SLOT</span><span class="o">=</span><span class="s2">"0"</span>
<span class="w"> </span><span class="nv">KEYWORDS</span><span class="o">=</span><span class="s2">"~amd64"</span>
<span class="w"> </span><span class="nv">IUSE</span><span class="o">=</span><span class="s2">"test +tools"</span>
<span class="w"> </span><span class="nv">RESTRICT</span><span class="o">=</span><span class="s2">"!test? ( test )"</span>
<span class="w"> </span><span class="nv">RDEPEND</span><span class="o">=</span><span class="s2">"acct-group/mongodb</span>
<span class="s2"> acct-user/mongodb</span>
<span class="s2"> >=app-arch/snappy-1.1.3</span>
<span class="s2"> >=dev-cpp/yaml-cpp-0.6.2:=</span>
<span class="s2"> >=dev-libs/boost-1.70:=[threads(+)]</span>
<span class="s2"> >=dev-libs/libpcre-8.42[cxx]</span>
<span class="s2"> app-arch/zstd</span>
<span class="s2"> dev-libs/snowball-stemmer</span>
<span class="s2"> net-libs/libpcap</span>
<span class="s2"> >=sys-libs/zlib-1.2.11:="</span>
<span class="w"> </span><span class="nv">DEPEND</span><span class="o">=</span><span class="s2">"</span><span class="si">${</span><span class="nv">RDEPEND</span><span class="si">}</span>
<span class="s2"> </span><span class="si">${</span><span class="nv">PYTHON_DEPS</span><span class="si">}</span>
<span class="s2"> </span><span class="k">$(</span>python_gen_any_dep<span class="w"> </span><span class="s1">'</span>
<span class="s1"> test? ( dev-python/pymongo[${PYTHON_USEDEP}] )</span>
<span class="hll"><span class="s1"> >=dev-util/scons-2.5.0[${PYTHON_USEDEP}]</span>
</span><span class="s1"> dev-python/cheetah3[${PYTHON_USEDEP}]</span>
<span class="s1"> dev-python/psutil[${PYTHON_USEDEP}]</span>
<span class="s1"> dev-python/pyyaml[${PYTHON_USEDEP}]</span>
<span class="s1"> virtual/python-typing[${PYTHON_USEDEP}]</span>
<span class="s1"> '</span><span class="k">)</span>
<span class="s2"> sys-libs/ncurses:0=</span>
<span class="s2"> sys-libs/readline:0="</span>
<span class="w"> </span><span class="nv">PDEPEND</span><span class="o">=</span><span class="s2">"tools? ( >=app-admin/mongo-tools-</span><span class="si">${</span><span class="nv">PV</span><span class="si">}</span><span class="s2"> )"</span>
<span class="w"> </span>python_check_deps<span class="o">()</span><span class="w"> </span><span class="o">{</span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span>use<span class="w"> </span>test<span class="p">;</span><span class="w"> </span><span class="k">then</span>
<span class="w"> </span>python_has_version<span class="w"> </span><span class="s2">"dev-python/pymongo[</span><span class="si">${</span><span class="nv">PYTHON_USEDEP</span><span class="si">}</span><span class="s2">]"</span><span class="w"> </span><span class="o">||</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="m">1</span>
<span class="w"> </span><span class="k">fi</span>
<span class="hll"><span class="w"> </span>python_has_version<span class="w"> </span><span class="s2">">=dev-util/scons-2.5.0[</span><span class="si">${</span><span class="nv">PYTHON_USEDEP</span><span class="si">}</span><span class="s2">]"</span><span class="w"> </span><span class="o">&&</span>
</span><span class="w"> </span>python_has_version<span class="w"> </span><span class="s2">"dev-python/cheetah3[</span><span class="si">${</span><span class="nv">PYTHON_USEDEP</span><span class="si">}</span><span class="s2">]"</span><span class="w"> </span><span class="o">&&</span>
<span class="w"> </span>python_has_version<span class="w"> </span><span class="s2">"dev-python/psutil[</span><span class="si">${</span><span class="nv">PYTHON_USEDEP</span><span class="si">}</span><span class="s2">]"</span><span class="w"> </span><span class="o">&&</span>
<span class="w"> </span>python_has_version<span class="w"> </span><span class="s2">"dev-python/pyyaml[</span><span class="si">${</span><span class="nv">PYTHON_USEDEP</span><span class="si">}</span><span class="s2">]"</span><span class="w"> </span><span class="o">&&</span>
<span class="w"> </span>python_has_version<span class="w"> </span><span class="s2">"virtual/python-typing[</span><span class="si">${</span><span class="nv">PYTHON_USEDEP</span><span class="si">}</span><span class="s2">]"</span>
<span class="w"> </span><span class="o">}</span>
<span class="w"> </span>src_configure<span class="o">()</span><span class="w"> </span><span class="o">{</span>
<span class="w"> </span><span class="nv">scons_opts</span><span class="o">=(</span>
<span class="w"> </span><span class="nv">CC</span><span class="o">=</span><span class="s2">"</span><span class="k">$(</span>tc-getCC<span class="k">)</span><span class="s2">"</span>
<span class="w"> </span><span class="nv">CXX</span><span class="o">=</span><span class="s2">"</span><span class="k">$(</span>tc-getCXX<span class="k">)</span><span class="s2">"</span>
<span class="w"> </span>--disable-warnings-as-errors
<span class="w"> </span>--use-system-boost
<span class="w"> </span>--use-system-pcre
<span class="w"> </span>--use-system-snappy
<span class="w"> </span>--use-system-stemmer
<span class="w"> </span>--use-system-yaml
<span class="w"> </span>--use-system-zlib
<span class="w"> </span>--use-system-zstd
<span class="w"> </span><span class="o">)</span>
<span class="w"> </span>default
<span class="w"> </span><span class="o">}</span>
<span class="w"> </span>src_compile<span class="o">()</span><span class="w"> </span><span class="o">{</span>
<span class="w"> </span>escons<span class="w"> </span><span class="s2">"</span><span class="si">${</span><span class="nv">scons_opts</span><span class="p">[@]</span><span class="si">}</span><span class="s2">"</span><span class="w"> </span>core<span class="w"> </span>tools
<span class="w"> </span><span class="o">}</span>
<span class="w"> </span>src_test<span class="o">()</span><span class="w"> </span><span class="o">{</span>
<span class="w"> </span><span class="s2">"</span><span class="si">${</span><span class="nv">EPYTHON</span><span class="si">}</span><span class="s2">"</span><span class="w"> </span>./buildscripts/resmoke.py<span class="w"> </span>--dbpathPrefix<span class="o">=</span><span class="nb">test</span><span class="w"> </span><span class="se">\</span>
<span class="w"> </span>--suites<span class="w"> </span>core<span class="w"> </span>--jobs<span class="o">=</span><span class="k">$(</span>makeopts_jobs<span class="k">)</span><span class="w"> </span><span class="o">||</span><span class="w"> </span>die<span class="w"> </span><span class="s2">"Tests failed"</span>
<span class="w"> </span><span class="o">}</span>
<span class="w"> </span>src_install<span class="o">()</span><span class="w"> </span><span class="o">{</span>
<span class="w"> </span>escons<span class="w"> </span><span class="s2">"</span><span class="si">${</span><span class="nv">scons_opts</span><span class="p">[@]</span><span class="si">}</span><span class="s2">"</span><span class="w"> </span>--nostrip<span class="w"> </span>install<span class="w"> </span>--prefix<span class="o">=</span><span class="s2">"</span><span class="si">${</span><span class="nv">ED</span><span class="si">}</span><span class="s2">"</span>/usr
<span class="w"> </span><span class="o">}</span>
</pre></div>
</div>
</section>
<section id="single-impl-package">
<h3>Single-impl package<a class="headerlink" href="#single-impl-package" title="Permalink to this heading">¶</a></h3>
<p>If the package needs to install some Python components, and single-impl
install is appropriate, you need to combine <code class="docutils literal notranslate"><span class="pre">python-single-r1</span></code>
with <code class="docutils literal notranslate"><span class="pre">scons-utils</span></code>. In this case, the eclass takes care of everything
needed for SCons, and you take care of everything needed for your
package.</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span><span class="w"> </span><span class="c1"># Copyright 1999-2020 Gentoo Authors</span>
<span class="w"> </span><span class="c1"># Distributed under the terms of the GNU General Public License v2</span>
<span class="w"> </span><span class="nv">EAPI</span><span class="o">=</span><span class="m">5</span>
<span class="hll"><span class="w"> </span><span class="nv">PYTHON_COMPAT</span><span class="o">=(</span><span class="w"> </span>python2_7<span class="w"> </span><span class="o">)</span>
</span><span class="hll"><span class="w"> </span>inherit<span class="w"> </span>eutils<span class="w"> </span>python-single-r1<span class="w"> </span>scons-utils<span class="w"> </span>toolchain-funcs
</span>
<span class="w"> </span><span class="nv">DESCRIPTION</span><span class="o">=</span><span class="s2">"Molecular dynamics by NMR data analysis"</span>
<span class="w"> </span><span class="nv">HOMEPAGE</span><span class="o">=</span><span class="s2">"https://www.nmr-relax.com/"</span>
<span class="w"> </span><span class="nv">SRC_URI</span><span class="o">=</span><span class="s2">"http://download.gna.org/relax/</span><span class="si">${</span><span class="nv">P</span><span class="si">}</span><span class="s2">.src.tar.bz2"</span>
<span class="w"> </span><span class="nv">SLOT</span><span class="o">=</span><span class="s2">"0"</span>
<span class="w"> </span><span class="nv">LICENSE</span><span class="o">=</span><span class="s2">"GPL-2"</span>
<span class="w"> </span><span class="nv">KEYWORDS</span><span class="o">=</span><span class="s2">"~amd64 ~x86 ~amd64-linux ~x86-linux"</span>
<span class="w"> </span><span class="nv">IUSE</span><span class="o">=</span><span class="s2">"test"</span>
<span class="w"> </span><span class="nv">RESTRICT</span><span class="o">=</span><span class="s2">"!test? ( test )"</span>
<span class="hll"><span class="w"> </span><span class="nv">REQUIRED_USE</span><span class="o">=</span><span class="s2">"</span><span class="si">${</span><span class="nv">PYTHON_REQUIRED_USE</span><span class="si">}</span><span class="s2">"</span>
</span>
<span class="w"> </span><span class="nv">RDEPEND</span><span class="o">=</span><span class="s2">"</span>
<span class="s2"> </span><span class="si">${</span><span class="nv">PYTHON_DEPS</span><span class="si">}</span>
<span class="s2"> </span><span class="k">$(</span>python_gen_cond_dep<span class="w"> </span><span class="s2">"</span>
<span class="s2"> dev-python/Numdifftools[\${PYTHON_USEDEP}]</span>
<span class="s2"> || (</span>
<span class="s2"> dev-python/matplotlib-python2[\${PYTHON_USEDEP}]</span>
<span class="s2"> dev-python/matplotlib[\${PYTHON_USEDEP}]</span>
<span class="s2"> )</span>
<span class="s2"> || (</span>
<span class="s2"> dev-python/numpy-python2[\${PYTHON_USEDEP}]</span>
<span class="s2"> dev-python/numpy[\${PYTHON_USEDEP}]</span>
<span class="s2"> )</span>
<span class="s2"> dev-python/wxpython:</span><span class="si">${</span><span class="nv">WX_GTK_VER</span><span class="si">}</span><span class="s2">[\${PYTHON_USEDEP}]</span>
<span class="s2"> sci-chemistry/pymol[\${PYTHON_USEDEP}]</span>
<span class="s2"> >=sci-libs/bmrblib-1.0.3[\${PYTHON_USEDEP}]</span>
<span class="s2"> >=sci-libs/minfx-1.0.11[\${PYTHON_USEDEP}]</span>
<span class="s2"> || (</span>
<span class="s2"> sci-libs/scipy-python2[\${PYTHON_USEDEP}]</span>
<span class="s2"> sci-libs/scipy[\${PYTHON_USEDEP}]</span>
<span class="s2"> )</span>
<span class="s2"> "</span><span class="k">)</span>
<span class="s2"> sci-chemistry/molmol</span>
<span class="s2"> sci-chemistry/vmd</span>
<span class="s2"> sci-visualization/grace</span>
<span class="s2"> sci-visualization/opendx"</span>
<span class="w"> </span><span class="nv">DEPEND</span><span class="o">=</span><span class="s2">"</span><span class="si">${</span><span class="nv">RDEPEND</span><span class="si">}</span>
<span class="s2"> media-gfx/pngcrush</span>
<span class="s2"> test? ( </span><span class="si">${</span><span class="nv">RDEPEND</span><span class="si">}</span><span class="s2"> )</span>
<span class="s2"> "</span>
<span class="w"> </span>src_compile<span class="o">()</span><span class="w"> </span><span class="o">{</span>
<span class="w"> </span>tc-export<span class="w"> </span>CC
<span class="w"> </span>escons
<span class="w"> </span><span class="o">}</span>
<span class="w"> </span>src_install<span class="o">()</span><span class="w"> </span><span class="o">{</span>
<span class="w"> </span>python_moduleinto<span class="w"> </span><span class="si">${</span><span class="nv">PN</span><span class="si">}</span>
<span class="w"> </span>python_domodule<span class="w"> </span>*
<span class="w"> </span>make_wrapper<span class="w"> </span><span class="si">${</span><span class="nv">PN</span><span class="si">}</span>-nmr<span class="w"> </span><span class="s2">"</span><span class="si">${</span><span class="nv">EPYTHON</span><span class="si">}</span><span class="s2"> </span><span class="k">$(</span>python_get_sitedir<span class="k">)</span><span class="s2">/</span><span class="si">${</span><span class="nv">PN</span><span class="si">}</span><span class="s2">/</span><span class="si">${</span><span class="nv">PN</span><span class="si">}</span><span class="s2">.py </span><span class="nv">$@</span><span class="s2">"</span>
<span class="w"> </span><span class="o">}</span>
</pre></div>
</div>
</section>
<section id="single-impl-package-with-conditional-python-install">
<h3>Single-impl package with conditional Python install<a class="headerlink" href="#single-impl-package-with-conditional-python-install" title="Permalink to this heading">¶</a></h3>
<p>If the runtime part of the package uses Python only conditionally,
the use is similar to a package with unconditional build-time
and conditional runtime dependency on Python. That is, build-time
dependencies, <code class="docutils literal notranslate"><span class="pre">REQUIRED_USE</span></code> and <code class="docutils literal notranslate"><span class="pre">pkg_setup</span></code> must be called
unconditionally.</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span><span class="w"> </span><span class="c1"># Copyright 1999-2020 Gentoo Authors</span>
<span class="w"> </span><span class="c1"># Distributed under the terms of the GNU General Public License v2</span>
<span class="w"> </span><span class="nv">EAPI</span><span class="o">=</span><span class="m">7</span>
<span class="hll"><span class="w"> </span><span class="nv">PYTHON_COMPAT</span><span class="o">=(</span><span class="w"> </span>python3_<span class="o">{</span><span class="m">6</span>,7,8<span class="o">}</span><span class="w"> </span><span class="o">)</span>
</span>
<span class="w"> </span><span class="nv">FORTRAN_NEEDED</span><span class="o">=</span>fortran
<span class="w"> </span><span class="nv">FORTRAN_STANDARD</span><span class="o">=</span><span class="m">90</span>
<span class="hll"><span class="w"> </span>inherit<span class="w"> </span>python-single-r1<span class="w"> </span>scons-utils<span class="w"> </span>toolchain-funcs
</span>
<span class="w"> </span><span class="nv">DESCRIPTION</span><span class="o">=</span><span class="s2">"Object-oriented tool suite for chemical kinetics, thermodynamics, and transport"</span>
<span class="w"> </span><span class="nv">HOMEPAGE</span><span class="o">=</span><span class="s2">"https://www.cantera.org"</span>
<span class="w"> </span><span class="nv">SRC_URI</span><span class="o">=</span><span class="s2">"https://github.com/Cantera/</span><span class="si">${</span><span class="nv">PN</span><span class="si">}</span><span class="s2">/archive/v</span><span class="si">${</span><span class="nv">PV</span><span class="si">}</span><span class="s2">.tar.gz -> </span><span class="si">${</span><span class="nv">P</span><span class="si">}</span><span class="s2">.tar.gz"</span>
<span class="w"> </span><span class="nv">LICENSE</span><span class="o">=</span><span class="s2">"BSD"</span>
<span class="w"> </span><span class="nv">SLOT</span><span class="o">=</span><span class="s2">"0"</span>
<span class="w"> </span><span class="nv">KEYWORDS</span><span class="o">=</span><span class="s2">"amd64 ~x86"</span>
<span class="w"> </span><span class="nv">IUSE</span><span class="o">=</span><span class="s2">"fortran pch +python"</span>
<span class="w"> </span><span class="nv">REQUIRED_USE</span><span class="o">=</span><span class="s2">"</span>
<span class="hll"><span class="s2"> </span><span class="si">${</span><span class="nv">PYTHON_REQUIRED_USE</span><span class="si">}</span>
</span><span class="s2"> "</span>
<span class="w"> </span><span class="nv">RDEPEND</span><span class="o">=</span><span class="s2">"</span>
<span class="s2"> python? (</span>
<span class="s2"> </span><span class="si">${</span><span class="nv">PYTHON_DEPS</span><span class="si">}</span>
<span class="s2"> </span><span class="k">$(</span>python_gen_cond_dep<span class="w"> </span><span class="s1">'</span>
<span class="s1"> dev-python/numpy[${PYTHON_USEDEP}]</span>
<span class="s1"> '</span><span class="k">)</span>
<span class="s2"> )</span>
<span class="s2"> <sci-libs/sundials-5.1.0:0=</span>
<span class="s2"> "</span>
<span class="w"> </span><span class="nv">DEPEND</span><span class="o">=</span><span class="s2">"</span>
<span class="s2"> </span><span class="si">${</span><span class="nv">RDEPEND</span><span class="si">}</span>
<span class="s2"> dev-cpp/eigen:3</span>
<span class="s2"> dev-libs/boost</span>
<span class="s2"> dev-libs/libfmt</span>
<span class="s2"> python? (</span>
<span class="s2"> </span><span class="k">$(</span>python_gen_cond_dep<span class="w"> </span><span class="s1">'</span>
<span class="s1"> dev-python/cython[${PYTHON_USEDEP}]</span>
<span class="s1"> '</span><span class="k">)</span>
<span class="s2"> )</span>
<span class="s2"> "</span>
<span class="w"> </span>pkg_setup<span class="o">()</span><span class="w"> </span><span class="o">{</span>
<span class="w"> </span>fortran-2_pkg_setup
<span class="hll"><span class="w"> </span>python-single-r1_pkg_setup
</span><span class="w"> </span><span class="o">}</span>
<span class="w"> </span>src_configure<span class="o">()</span><span class="w"> </span><span class="o">{</span>
<span class="w"> </span><span class="nv">scons_vars</span><span class="o">=(</span>
<span class="w"> </span><span class="nv">CC</span><span class="o">=</span><span class="s2">"</span><span class="k">$(</span>tc-getCC<span class="k">)</span><span class="s2">"</span>
<span class="w"> </span><span class="nv">CXX</span><span class="o">=</span><span class="s2">"</span><span class="k">$(</span>tc-getCXX<span class="k">)</span><span class="s2">"</span>
<span class="w"> </span><span class="nv">cc_flags</span><span class="o">=</span><span class="s2">"</span><span class="si">${</span><span class="nv">CXXFLAGS</span><span class="si">}</span><span class="s2">"</span>
<span class="w"> </span><span class="nv">cxx_flags</span><span class="o">=</span><span class="s2">"-std=c++11"</span>
<span class="w"> </span><span class="nv">debug</span><span class="o">=</span><span class="s2">"no"</span>
<span class="w"> </span><span class="nv">FORTRAN</span><span class="o">=</span><span class="s2">"</span><span class="k">$(</span>tc-getFC<span class="k">)</span><span class="s2">"</span>
<span class="w"> </span><span class="nv">FORTRANFLAGS</span><span class="o">=</span><span class="s2">"</span><span class="si">${</span><span class="nv">CXXFLAGS</span><span class="si">}</span><span class="s2">"</span>
<span class="w"> </span><span class="nv">optimize_flags</span><span class="o">=</span><span class="s2">"-Wno-inline"</span>
<span class="w"> </span><span class="nv">renamed_shared_libraries</span><span class="o">=</span><span class="s2">"no"</span>
<span class="w"> </span><span class="nv">use_pch</span><span class="o">=</span><span class="k">$(</span>usex<span class="w"> </span>pch<span class="k">)</span>
<span class="w"> </span><span class="nv">system_fmt</span><span class="o">=</span><span class="s2">"y"</span>
<span class="w"> </span><span class="nv">system_sundials</span><span class="o">=</span><span class="s2">"y"</span>
<span class="w"> </span><span class="nv">system_eigen</span><span class="o">=</span><span class="s2">"y"</span>
<span class="w"> </span><span class="nv">env_vars</span><span class="o">=</span><span class="s2">"all"</span>
<span class="w"> </span><span class="nv">extra_inc_dirs</span><span class="o">=</span><span class="s2">"/usr/include/eigen3"</span>
<span class="w"> </span><span class="o">)</span>
<span class="w"> </span><span class="nv">scons_targets</span><span class="o">=(</span>
<span class="w"> </span><span class="nv">f90_interface</span><span class="o">=</span><span class="k">$(</span>usex<span class="w"> </span>fortran<span class="w"> </span>y<span class="w"> </span>n<span class="k">)</span>
<span class="w"> </span><span class="nv">python2_package</span><span class="o">=</span><span class="s2">"none"</span>
<span class="w"> </span><span class="o">)</span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span>use<span class="w"> </span>python<span class="w"> </span><span class="p">;</span><span class="w"> </span><span class="k">then</span>
<span class="w"> </span><span class="nv">scons_targets</span><span class="o">+=(</span><span class="w"> </span><span class="nv">python3_package</span><span class="o">=</span><span class="s2">"full"</span><span class="w"> </span><span class="nv">python3_cmd</span><span class="o">=</span><span class="s2">"</span><span class="si">${</span><span class="nv">EPYTHON</span><span class="si">}</span><span class="s2">"</span><span class="w"> </span><span class="o">)</span>
<span class="w"> </span><span class="k">else</span>
<span class="w"> </span><span class="nv">scons_targets</span><span class="o">+=(</span><span class="w"> </span><span class="nv">python3_package</span><span class="o">=</span><span class="s2">"none"</span><span class="w"> </span><span class="o">)</span>
<span class="w"> </span><span class="k">fi</span>
<span class="w"> </span><span class="o">}</span>
<span class="w"> </span>src_compile<span class="o">()</span><span class="w"> </span><span class="o">{</span>
<span class="w"> </span>escons<span class="w"> </span>build<span class="w"> </span><span class="s2">"</span><span class="si">${</span><span class="nv">scons_vars</span><span class="p">[@]</span><span class="si">}</span><span class="s2">"</span><span class="w"> </span><span class="s2">"</span><span class="si">${</span><span class="nv">scons_targets</span><span class="p">[@]</span><span class="si">}</span><span class="s2">"</span><span class="w"> </span><span class="nv">prefix</span><span class="o">=</span><span class="s2">"/usr"</span>
<span class="w"> </span><span class="o">}</span>
<span class="w"> </span>src_test<span class="o">()</span><span class="w"> </span><span class="o">{</span>
<span class="w"> </span>escons<span class="w"> </span><span class="nb">test</span>
<span class="w"> </span><span class="o">}</span>
<span class="w"> </span>src_install<span class="o">()</span><span class="w"> </span><span class="o">{</span>
<span class="w"> </span>escons<span class="w"> </span>install<span class="w"> </span><span class="nv">stage_dir</span><span class="o">=</span><span class="s2">"</span><span class="si">${</span><span class="nv">D</span><span class="si">}</span><span class="s2">"</span><span class="w"> </span><span class="nv">libdirname</span><span class="o">=</span><span class="s2">"</span><span class="k">$(</span>get_libdir<span class="k">)</span><span class="s2">"</span>
<span class="w"> </span>python_optimize
<span class="w"> </span><span class="o">}</span>
</pre></div>
</div>
</section>
<section id="pure-python-multi-impl-package">
<h3>Pure Python multi-impl package<a class="headerlink" href="#pure-python-multi-impl-package" title="Permalink to this heading">¶</a></h3>
<p>When you are dealing with a pure Python package using SCons, it makes
sense to use plain <code class="docutils literal notranslate"><span class="pre">python-r1</span></code> API. This means that SCons is going
to be called from a <code class="docutils literal notranslate"><span class="pre">python_foreach_impl</span></code> loop only.</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span><span class="w"> </span><span class="c1"># Copyright 1999-2020 Gentoo Authors</span>
<span class="w"> </span><span class="c1"># Distributed under the terms of the GNU General Public License v2</span>
<span class="w"> </span><span class="nv">EAPI</span><span class="o">=</span><span class="m">7</span>
<span class="hll"><span class="w"> </span><span class="nv">PYTHON_COMPAT</span><span class="o">=(</span><span class="w"> </span>python2_7<span class="w"> </span><span class="o">)</span>
</span><span class="hll"><span class="w"> </span>inherit<span class="w"> </span>fortran-2<span class="w"> </span>python-r1<span class="w"> </span>scons-utils<span class="w"> </span>toolchain-funcs
</span>
<span class="w"> </span><span class="nv">DESCRIPTION</span><span class="o">=</span><span class="s2">"Automated pipeline for performing Poisson-Boltzmann electrostatics calculations"</span>
<span class="w"> </span><span class="nv">HOMEPAGE</span><span class="o">=</span><span class="s2">"https://www.poissonboltzmann.org/"</span>
<span class="w"> </span><span class="nv">SRC_URI</span><span class="o">=</span><span class="s2">"https://github.com/Electrostatics/apbs-</span><span class="si">${</span><span class="nv">PN</span><span class="si">}</span><span class="s2">/releases/download/</span><span class="si">${</span><span class="nv">P</span><span class="si">}</span><span class="s2">/</span><span class="si">${</span><span class="nv">PN</span><span class="si">}</span><span class="s2">-src-</span><span class="si">${</span><span class="nv">PV</span><span class="si">}</span><span class="s2">.tar.gz"</span>
<span class="w"> </span><span class="nv">SLOT</span><span class="o">=</span><span class="s2">"0"</span>
<span class="w"> </span><span class="nv">LICENSE</span><span class="o">=</span><span class="s2">"BSD"</span>
<span class="w"> </span><span class="nv">KEYWORDS</span><span class="o">=</span><span class="s2">"amd64 x86 ~amd64-linux ~x86-linux"</span>
<span class="w"> </span><span class="nv">IUSE</span><span class="o">=</span><span class="s2">"opal"</span>
<span class="hll"><span class="w"> </span><span class="nv">REQUIRED_USE</span><span class="o">=</span><span class="s2">"</span><span class="si">${</span><span class="nv">PYTHON_REQUIRED_USE</span><span class="si">}</span><span class="s2">"</span>
</span>
<span class="w"> </span><span class="nv">RDEPEND</span><span class="o">=</span><span class="s2">"</span><span class="si">${</span><span class="nv">PYTHON_DEPS</span><span class="si">}</span>
<span class="s2"> || (</span>
<span class="s2"> dev-python/numpy-python2[</span><span class="si">${</span><span class="nv">PYTHON_USEDEP</span><span class="si">}</span><span class="s2">]</span>
<span class="s2"> dev-python/numpy[</span><span class="si">${</span><span class="nv">PYTHON_USEDEP</span><span class="si">}</span><span class="s2">]</span>
<span class="s2"> )</span>
<span class="s2"> sci-chemistry/openbabel-python[</span><span class="si">${</span><span class="nv">PYTHON_USEDEP</span><span class="si">}</span><span class="s2">]</span>
<span class="s2"> opal? ( dev-python/zsi[</span><span class="si">${</span><span class="nv">PYTHON_USEDEP</span><span class="si">}</span><span class="s2">] )</span>
<span class="s2"> "</span>
<span class="w"> </span><span class="nv">DEPEND</span><span class="o">=</span><span class="s2">"</span><span class="si">${</span><span class="nv">RDEPEND</span><span class="si">}</span>
<span class="s2"> dev-lang/swig:0</span>
<span class="hll"><span class="s2"> dev-util/scons[</span><span class="si">${</span><span class="nv">PYTHON_USEDEP</span><span class="si">}</span><span class="s2">]"</span>
</span>
<span class="w"> </span>src_prepare<span class="o">()</span><span class="w"> </span><span class="o">{</span>
<span class="w"> </span>find<span class="w"> </span>-type<span class="w"> </span>f<span class="w"> </span><span class="se">\(</span><span class="w"> </span>-name<span class="w"> </span><span class="s2">"*.pyc"</span><span class="w"> </span>-o<span class="w"> </span>-name<span class="w"> </span><span class="s2">"*.pyo"</span><span class="w"> </span><span class="se">\)</span><span class="w"> </span>-delete<span class="w"> </span><span class="o">||</span><span class="w"> </span>die
<span class="w"> </span>eapply<span class="w"> </span><span class="s2">"</span><span class="si">${</span><span class="nv">PATCHES</span><span class="p">[@]</span><span class="si">}</span><span class="s2">"</span>
<span class="w"> </span>eapply_user
<span class="w"> </span>rm<span class="w"> </span>-rf<span class="w"> </span>scons<span class="w"> </span><span class="o">||</span><span class="w"> </span>die
<span class="w"> </span>python_copy_sources
<span class="w"> </span><span class="o">}</span>
<span class="w"> </span>python_configure<span class="o">()</span><span class="w"> </span><span class="o">{</span>
<span class="w"> </span>tc-export<span class="w"> </span>CXX
<span class="w"> </span>cat<span class="w"> </span>><span class="w"> </span><span class="s2">"</span><span class="si">${</span><span class="nv">BUILD_DIR</span><span class="si">}</span><span class="s2">"</span>/build_config.py<span class="w"> </span><span class="s"><<-EOF || die</span>
<span class="s"> PREFIX="${D}/$(python_get_sitedir)/${PN}"</span>
<span class="s"> APBS="${EPREFIX}/usr/bin/apbs"</span>
<span class="s"> MAX_ATOMS=10000</span>
<span class="s"> BUILD_PDB2PKA=False</span>
<span class="s"> REBUILD_SWIG=True</span>
<span class="s"> EOF</span>
<span class="w"> </span><span class="o">}</span>
<span class="w"> </span>src_configure<span class="o">()</span><span class="w"> </span><span class="o">{</span>
<span class="w"> </span>python_foreach_impl<span class="w"> </span>python_configure
<span class="w"> </span><span class="o">}</span>
<span class="w"> </span>src_compile<span class="o">()</span><span class="w"> </span><span class="o">{</span>
<span class="hll"><span class="w"> </span>python_foreach_impl<span class="w"> </span>run_in_build_dir<span class="w"> </span>escons
</span><span class="w"> </span><span class="o">}</span>
<span class="w"> </span>python_install<span class="o">()</span><span class="w"> </span><span class="o">{</span>
<span class="w"> </span><span class="nb">cd</span><span class="w"> </span><span class="s2">"</span><span class="si">${</span><span class="nv">BUILD_DIR</span><span class="si">}</span><span class="s2">"</span><span class="w"> </span><span class="o">||</span><span class="w"> </span>die
<span class="hll"><span class="w"> </span>escons<span class="w"> </span>install
</span><span class="w"> </span>python_optimize
<span class="w"> </span><span class="o">}</span>
<span class="w"> </span>src_install<span class="o">()</span><span class="w"> </span><span class="o">{</span>
<span class="w"> </span>python_foreach_impl<span class="w"> </span>python_install
<span class="w"> </span><span class="o">}</span>
</pre></div>
</div>
</section>
<section id="hybrid-python-r1-scons-package">
<h3>Hybrid python-r1 + SCons package<a class="headerlink" href="#hybrid-python-r1-scons-package" title="Permalink to this heading">¶</a></h3>
<p>Finally, let’s consider a package that uses SCons as a build system
and installs Python components independently of it. This could be
e.g. a C/C++ program with separate Python bindings.</p>
<p>Let’s presume that the Python bindings need to be installed manually,
and they support a wider target range than the build system. In this
case, the any-r1 API is recommended.</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span><span class="w"> </span><span class="c1"># Copyright 1999-2020 Gentoo Authors</span>
<span class="w"> </span><span class="c1"># Distributed under the terms of the GNU General Public License v2</span>
<span class="w"> </span><span class="nv">EAPI</span><span class="o">=</span><span class="m">7</span>
<span class="w"> </span><span class="nv">PYTHON_COMPAT</span><span class="o">=(</span><span class="w"> </span>python2_7<span class="w"> </span>python3_6<span class="w"> </span><span class="o">)</span>
<span class="w"> </span>inherit<span class="w"> </span>python-r1<span class="w"> </span>scons-utils<span class="w"> </span>toolchain-funcs
<span class="w"> </span><span class="nv">DESCRIPTION</span><span class="o">=</span><span class="s2">"GPS daemon and library for USB/serial GPS devices and GPS/mapping clients"</span>
<span class="w"> </span><span class="nv">HOMEPAGE</span><span class="o">=</span><span class="s2">"https://gpsd.gitlab.io/gpsd/"</span>
<span class="w"> </span><span class="nv">SRC_URI</span><span class="o">=</span><span class="s2">"mirror://nongnu/</span><span class="si">${</span><span class="nv">PN</span><span class="si">}</span><span class="s2">/</span><span class="si">${</span><span class="nv">P</span><span class="si">}</span><span class="s2">.tar.gz"</span>
<span class="w"> </span><span class="nv">LICENSE</span><span class="o">=</span><span class="s2">"BSD"</span>
<span class="w"> </span><span class="nv">SLOT</span><span class="o">=</span><span class="s2">"0/24"</span>
<span class="w"> </span><span class="nv">KEYWORDS</span><span class="o">=</span><span class="s2">"~amd64 ~arm ~ppc ~ppc64 ~sparc ~x86"</span>
<span class="w"> </span><span class="nv">IUSE</span><span class="o">=</span><span class="s2">"python"</span>
<span class="w"> </span><span class="nv">REQUIRED_USE</span><span class="o">=</span><span class="s2">"</span>
<span class="s2"> python? ( </span><span class="si">${</span><span class="nv">PYTHON_REQUIRED_USE</span><span class="si">}</span><span class="s2"> )"</span>
<span class="w"> </span><span class="nv">RDEPEND</span><span class="o">=</span><span class="s2">"</span>
<span class="s2"> >=net-misc/pps-tools-0.0.20120407</span>
<span class="s2"> python? ( </span><span class="si">${</span><span class="nv">PYTHON_DEPS</span><span class="si">}</span><span class="s2"> )"</span>
<span class="w"> </span><span class="nv">DEPEND</span><span class="o">=</span><span class="s2">"</span><span class="si">${</span><span class="nv">RDEPEND</span><span class="si">}</span>
<span class="hll"><span class="s2"> </span><span class="k">$(</span>python_gen_any_dep<span class="w"> </span><span class="s1">'>=dev-util/scons-2.3.0[${PYTHON_USEDEP}]'</span><span class="w"> </span>-2<span class="k">)</span>
</span><span class="s2"> virtual/pkgconfig"</span>
<span class="hll"><span class="w"> </span>python_check_deps<span class="o">()</span><span class="w"> </span><span class="o">{</span>
</span><span class="hll"><span class="w"> </span>python_has_version<span class="w"> </span><span class="s2">">=dev-util/scons-2.3.0[</span><span class="si">${</span><span class="nv">PYTHON_USEDEP</span><span class="si">}</span><span class="s2">]"</span>
</span><span class="hll"><span class="w"> </span><span class="o">}</span>
</span>
<span class="w"> </span>src_configure<span class="o">()</span><span class="w"> </span><span class="o">{</span>
<span class="w"> </span><span class="nv">myesconsargs</span><span class="o">=(</span>
<span class="w"> </span><span class="nv">prefix</span><span class="o">=</span><span class="s2">"</span><span class="si">${</span><span class="nv">EPREFIX</span><span class="si">}</span><span class="s2">/usr"</span>
<span class="w"> </span><span class="nv">libdir</span><span class="o">=</span><span class="s2">"\$prefix/</span><span class="k">$(</span>get_libdir<span class="k">)</span><span class="s2">"</span>
<span class="w"> </span><span class="nv">udevdir</span><span class="o">=</span><span class="s2">"</span><span class="k">$(</span>get_udevdir<span class="k">)</span><span class="s2">"</span>
<span class="w"> </span><span class="nv">chrpath</span><span class="o">=</span>False
<span class="w"> </span><span class="nv">gpsd_user</span><span class="o">=</span>gpsd
<span class="w"> </span><span class="nv">gpsd_group</span><span class="o">=</span>uucp
<span class="w"> </span><span class="nv">nostrip</span><span class="o">=</span>True
<span class="w"> </span><span class="nv">manbuild</span><span class="o">=</span>False
<span class="w"> </span><span class="k">$(</span>use_scons<span class="w"> </span>python<span class="k">)</span>
<span class="w"> </span><span class="o">)</span>
<span class="w"> </span><span class="c1"># SConstruct uses py2 constructs</span>
<span class="hll"><span class="w"> </span>python_setup<span class="w"> </span>-2
</span><span class="w"> </span><span class="o">}</span>
<span class="w"> </span>src_compile<span class="o">()</span><span class="w"> </span><span class="o">{</span>
<span class="w"> </span><span class="nb">export</span><span class="w"> </span><span class="nv">CHRPATH</span><span class="o">=</span>
<span class="w"> </span>tc-export<span class="w"> </span>CC<span class="w"> </span>CXX<span class="w"> </span>PKG_CONFIG
<span class="w"> </span><span class="nb">export</span><span class="w"> </span><span class="nv">SHLINKFLAGS</span><span class="o">=</span><span class="si">${</span><span class="nv">LDFLAGS</span><span class="si">}</span><span class="w"> </span><span class="nv">LINKFLAGS</span><span class="o">=</span><span class="si">${</span><span class="nv">LDFLAGS</span><span class="si">}</span>
<span class="w"> </span>escons
<span class="w"> </span><span class="o">}</span>
<span class="w"> </span>src_install<span class="o">()</span><span class="w"> </span><span class="o">{</span>
<span class="w"> </span><span class="nv">DESTDIR</span><span class="o">=</span><span class="s2">"</span><span class="si">${</span><span class="nv">D</span><span class="si">}</span><span class="s2">"</span><span class="w"> </span>escons<span class="w"> </span>install
<span class="w"> </span>use<span class="w"> </span>python<span class="w"> </span><span class="o">&&</span><span class="w"> </span>python_foreach_impl<span class="w"> </span>python_domodule<span class="w"> </span>gps
<span class="w"> </span><span class="o">}</span>
</pre></div>
</div>
</section>
</section>
<section id="waf">
<h2>waf<a class="headerlink" href="#waf" title="Permalink to this heading">¶</a></h2>
<p>The <a class="reference external" href="https://waf.io/">waf</a> build system is written in Python and bundled with the packages
using it. Therefore, it is necessary to combine <code class="docutils literal notranslate"><span class="pre">waf-utils</span></code> eclass
with one of the Python eclasses.</p>
<p>Since SCons does not have any dependencies beside the Python
interpreter, the integration is generally simple. You consider waf
like any other build-time script, and use the eclass implied by other
Python components in package.</p>
<p>Furthermore, since waf requires threading support in the Python
interpreter, it is necessary to add <code class="docutils literal notranslate"><span class="pre">PYTHON_REQ_USE='threads(+)'</span></code> in
all waf packages (combined with individual package requirements if
applicable).</p>
<section id="build-time-use">
<h3>Build-time use<a class="headerlink" href="#build-time-use" title="Permalink to this heading">¶</a></h3>
<p>If waf is the only build-time Python script in the package, it is only
necessary to add <code class="docutils literal notranslate"><span class="pre">PYTHON_REQ_USE</span></code> and <code class="docutils literal notranslate"><span class="pre">${PYTHON_DEPS}</span></code> to build-time
dependencies. If the package had other Python dependencies, you would
specify them instead.</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span><span class="w"> </span><span class="c1"># Copyright 1999-2020 Gentoo Authors</span>
<span class="w"> </span><span class="c1"># Distributed under the terms of the GNU General Public License v2</span>
<span class="w"> </span><span class="nv">EAPI</span><span class="o">=</span><span class="m">7</span>
<span class="hll"><span class="w"> </span><span class="nv">PYTHON_COMPAT</span><span class="o">=(</span><span class="w"> </span>python2_7<span class="w"> </span><span class="o">)</span>
</span><span class="hll"><span class="w"> </span><span class="nv">PYTHON_REQ_USE</span><span class="o">=</span><span class="s1">'threads(+)'</span>
</span><span class="w"> </span><span class="nv">NO_WAF_LIBDIR</span><span class="o">=</span>yes
<span class="hll"><span class="w"> </span>inherit<span class="w"> </span>python-any-r1<span class="w"> </span>waf-utils
</span>
<span class="w"> </span><span class="nv">DESCRIPTION</span><span class="o">=</span><span class="s2">"C++ Template Unit Test Framework"</span>
<span class="w"> </span><span class="nv">HOMEPAGE</span><span class="o">=</span><span class="s2">"http://mrzechonek.github.io/tut-framework/"</span>
<span class="w"> </span><span class="nv">SRC_URI</span><span class="o">=</span><span class="s2">"https://github.com/mrzechonek/tut-framework/archive/</span><span class="si">${</span><span class="nv">PV</span><span class="p">//./-</span><span class="si">}</span><span class="s2">.tar.gz -> </span><span class="si">${</span><span class="nv">P</span><span class="si">}</span><span class="s2">.tar.gz"</span>
<span class="w"> </span><span class="nv">S</span><span class="o">=</span><span class="s2">"</span><span class="si">${</span><span class="nv">WORKDIR</span><span class="si">}</span><span class="s2">/tut-framework-</span><span class="si">${</span><span class="nv">PV</span><span class="p">//./-</span><span class="si">}</span><span class="s2">"</span>
<span class="w"> </span><span class="nv">LICENSE</span><span class="o">=</span><span class="s2">"BSD-2"</span>
<span class="w"> </span><span class="nv">SLOT</span><span class="o">=</span><span class="s2">"0"</span>
<span class="w"> </span><span class="nv">KEYWORDS</span><span class="o">=</span><span class="s2">"~amd64 ~x86"</span>
<span class="w"> </span><span class="nv">IUSE</span><span class="o">=</span><span class="s2">""</span>
<span class="hll"><span class="w"> </span><span class="nv">BDEPEND</span><span class="o">=</span><span class="si">${</span><span class="nv">PYTHON_DEPS</span><span class="si">}</span>
</span></pre></div>
</div>
</section>
<section id="id1">
<h3>Single-impl package<a class="headerlink" href="#id1" title="Permalink to this heading">¶</a></h3>
<p>The rules for integrating simple-impl package are roughly the same
as for pure <code class="docutils literal notranslate"><span class="pre">python-single-r1</span></code> use. Again, waf requires only plain
build-time <code class="docutils literal notranslate"><span class="pre">${PYTHON_DEPS}</span></code> and <code class="docutils literal notranslate"><span class="pre">PYTHON_REQ_USE</span></code>.</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span><span class="w"> </span><span class="c1"># Copyright 1999-2020 Gentoo Authors</span>
<span class="w"> </span><span class="c1"># Distributed under the terms of the GNU General Public License v2</span>
<span class="w"> </span><span class="nv">EAPI</span><span class="o">=</span><span class="m">6</span>
<span class="hll"><span class="w"> </span><span class="nv">PYTHON_COMPAT</span><span class="o">=(</span><span class="w"> </span>python2_7<span class="w"> </span><span class="o">)</span>
</span><span class="hll"><span class="w"> </span><span class="nv">PYTHON_REQ_USE</span><span class="o">=</span><span class="s2">"threads"</span>
</span>
<span class="hll"><span class="w"> </span>inherit<span class="w"> </span>python-single-r1<span class="w"> </span>waf-utils
</span>
<span class="w"> </span><span class="nv">DESCRIPTION</span><span class="o">=</span><span class="s2">"An LDAP-like embedded database"</span>
<span class="w"> </span><span class="nv">HOMEPAGE</span><span class="o">=</span><span class="s2">"https://ldb.samba.org/"</span>
<span class="w"> </span><span class="nv">SRC_URI</span><span class="o">=</span><span class="s2">"https://www.samba.org/ftp/pub/</span><span class="si">${</span><span class="nv">PN</span><span class="si">}</span><span class="s2">/</span><span class="si">${</span><span class="nv">P</span><span class="si">}</span><span class="s2">.tar.gz"</span>
<span class="w"> </span><span class="nv">LICENSE</span><span class="o">=</span><span class="s2">"LGPL-3"</span>
<span class="w"> </span><span class="nv">SLOT</span><span class="o">=</span><span class="s2">"0/</span><span class="si">${</span><span class="nv">PV</span><span class="si">}</span><span class="s2">"</span>
<span class="w"> </span><span class="nv">KEYWORDS</span><span class="o">=</span><span class="s2">"~alpha amd64 arm ~arm64 ~hppa ia64 ~mips ppc ppc64 ~s390 ~sh sparc x86"</span>
<span class="w"> </span><span class="nv">IUSE</span><span class="o">=</span><span class="s2">"+ldap python"</span>
<span class="w"> </span><span class="nv">REQUIRED_USE</span><span class="o">=</span><span class="s2">"python? ( </span><span class="si">${</span><span class="nv">PYTHON_REQUIRED_USE</span><span class="si">}</span><span class="s2"> )"</span>
<span class="w"> </span><span class="nv">RDEPEND</span><span class="o">=</span><span class="s2">"!elibc_FreeBSD? ( dev-libs/libbsd )</span>
<span class="s2"> dev-libs/popt</span>
<span class="s2"> >=sys-libs/talloc-2.1.8[python?]</span>
<span class="s2"> >=sys-libs/tevent-0.9.31[python(+)?]</span>
<span class="s2"> >=sys-libs/tdb-1.3.12[python?]</span>
<span class="s2"> python? ( </span><span class="si">${</span><span class="nv">PYTHON_DEPS</span><span class="si">}</span><span class="s2"> )</span>
<span class="s2"> ldap? ( net-nds/openldap )</span>
<span class="s2"> "</span>
<span class="w"> </span><span class="nv">DEPEND</span><span class="o">=</span><span class="s2">"dev-libs/libxslt</span>
<span class="s2"> virtual/pkgconfig</span>
<span class="hll"><span class="s2"> </span><span class="si">${</span><span class="nv">PYTHON_DEPS</span><span class="si">}</span>
</span><span class="s2"> </span><span class="si">${</span><span class="nv">RDEPEND</span><span class="si">}</span><span class="s2">"</span>
<span class="w"> </span><span class="nv">WAF_BINARY</span><span class="o">=</span><span class="s2">"</span><span class="si">${</span><span class="nv">S</span><span class="si">}</span><span class="s2">/buildtools/bin/waf"</span>
<span class="w"> </span><span class="nv">PATCHES</span><span class="o">=(</span>
<span class="w"> </span><span class="s2">"</span><span class="si">${</span><span class="nv">FILESDIR</span><span class="si">}</span><span class="s2">"</span>/<span class="si">${</span><span class="nv">PN</span><span class="si">}</span>-1.1.27-optional_packages.patch
<span class="w"> </span><span class="s2">"</span><span class="si">${</span><span class="nv">FILESDIR</span><span class="si">}</span><span class="s2">"</span>/<span class="si">${</span><span class="nv">P</span><span class="si">}</span>-disable-python.patch
<span class="w"> </span><span class="o">)</span>
<span class="w"> </span>pkg_setup<span class="o">()</span><span class="w"> </span><span class="o">{</span>
<span class="hll"><span class="w"> </span>python-single-r1_pkg_setup
</span><span class="w"> </span><span class="o">}</span>
<span class="w"> </span>src_configure<span class="o">()</span><span class="w"> </span><span class="o">{</span>
<span class="w"> </span><span class="nb">local</span><span class="w"> </span><span class="nv">myconf</span><span class="o">=(</span>
<span class="w"> </span><span class="k">$(</span>usex<span class="w"> </span>ldap<span class="w"> </span><span class="s1">''</span><span class="w"> </span>--disable-ldap<span class="k">)</span>
<span class="w"> </span><span class="k">$(</span>usex<span class="w"> </span>python<span class="w"> </span><span class="s1">''</span><span class="w"> </span><span class="s1">'--disable-python'</span><span class="k">)</span>
<span class="w"> </span>--disable-rpath
<span class="w"> </span>--disable-rpath-install<span class="w"> </span>--bundled-libraries<span class="o">=</span>NONE
<span class="w"> </span>--with-modulesdir<span class="o">=</span><span class="s2">"</span><span class="si">${</span><span class="nv">EPREFIX</span><span class="si">}</span><span class="s2">"</span>/usr/<span class="k">$(</span>get_libdir<span class="k">)</span>/samba
<span class="w"> </span>--builtin-libraries<span class="o">=</span>NONE
<span class="w"> </span><span class="o">)</span>
<span class="w"> </span>waf-utils_src_configure<span class="w"> </span><span class="s2">"</span><span class="si">${</span><span class="nv">myconf</span><span class="p">[@]</span><span class="si">}</span><span class="s2">"</span>
<span class="w"> </span><span class="o">}</span>
</pre></div>
</div>
</section>
</section>
</section>
</div>
</div>
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<li class="toctree-l1"><a class="reference internal" href="preface.html">Preface</a></li>
<li class="toctree-l1"><a class="reference internal" href="interpreter.html">Python interpreters</a></li>
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<li class="toctree-l1"><a class="reference internal" href="expert-multi.html">Expert python-r1 usage</a></li>
<li class="toctree-l1 current"><a class="current reference internal" href="#">Integration with build systems written in Python</a><ul>
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