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<h1>USE flags<a class="headerlink" href="#use-flags" title="Permalink to this headline">¶</a></h1>
<div class="section" id="versioned-use-flags">
<span id="index-0"></span><h2>Versioned USE flags<a class="headerlink" href="#versioned-use-flags" title="Permalink to this headline">¶</a></h2>
<dl class="field-list simple">
<dt class="field-odd">Source</dt>
<dd class="field-odd"><p>QA</p>
</dd>
<dt class="field-even">Reference</dt>
<dd class="field-even"><p><a class="reference external" href="https://wiki.gentoo.org/index.php?title=Project:Quality_Assurance/Policies&oldid=109991#Versioned_USE_flags">https://wiki.gentoo.org/index.php?title=Project:Quality_Assurance/Policies&oldid=109991#Versioned_USE_flags</a></p>
</dd>
<dt class="field-odd">Reported</dt>
<dd class="field-odd"><p>no</p>
</dd>
</dl>
<p>If a need arises to create new USE flags responsible for switching
between multiple versions of a specific dependency, it is recommended
that flat, explicitly versioned flags are used (e.g. <code class="docutils literal notranslate"><span class="pre">qt4</span></code>, <code class="docutils literal notranslate"><span class="pre">qt5</span></code>).
The hierarchical form used e.g. by GTK+ (<code class="docutils literal notranslate"><span class="pre">gtk</span></code> meaning 2-or-3,
then optionally <code class="docutils literal notranslate"><span class="pre">gtk2</span></code> or <code class="docutils literal notranslate"><span class="pre">gtk3</span></code> to switch between both)
is discouraged.</p>
<p>Any future set of USE flags introduced in this way needs to be discussed
with the QA team before introduction.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>This policy has historically been defined as an generalization
of the QA policy on gtk/gtk2/gtk3 flags. The latter policy has been
removed since.</p>
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<div class="section" id="use-gui-flag">
<span id="index-1"></span><h2>USE=gui flag<a class="headerlink" href="#use-gui-flag" title="Permalink to this headline">¶</a></h2>
<dl class="field-list simple">
<dt class="field-odd">Source</dt>
<dd class="field-odd"><p>QA</p>
</dd>
<dt class="field-even">Reference</dt>
<dd class="field-even"><p><a class="reference external" href="https://archives.gentoo.org/gentoo-dev/message/cf3f5a59ac918335766632bd02438722">https://archives.gentoo.org/gentoo-dev/message/cf3f5a59ac918335766632bd02438722</a></p>
</dd>
<dt class="field-odd">Reported</dt>
<dd class="field-odd"><p>no</p>
</dd>
</dl>
<p>Whenever a package offers an optional GUI support, the <code class="docutils literal notranslate"><span class="pre">gui</span></code> flag must
be used to control that support rather than historically used <code class="docutils literal notranslate"><span class="pre">X</span></code>
or toolkit flags. Toolkit flags can still be used to choose between
multiple available GUIs, or when the toolkit is used in a more
specialized way than for GUI (e.g. to control installing widgets).</p>
<p><em>Rationale</em>: the historical use of toolkit flags to control building
GUIs made it very hard for users to express the simple wish of ‘I want
<em>any</em> GUI’. Installing various packages made it necessary to either
adjust flags per package (manually discovering which flags are necessary
to obtain the GUI) or enabling multiple toolkits globally which
afterwards caused issues with packages supporting a choice between
multiple GUIs.</p>
</div>
<div class="section" id="underscores-in-use-flag-names">
<span id="index-2"></span><h2>Underscores in USE flag names<a class="headerlink" href="#underscores-in-use-flag-names" title="Permalink to this headline">¶</a></h2>
<dl class="field-list simple">
<dt class="field-odd">Source</dt>
<dd class="field-odd"><p>Council</p>
</dd>
<dt class="field-even">Reference</dt>
<dd class="field-even"><p><a class="reference external" href="https://projects.gentoo.org/council/meeting-logs/20191013-summary.txt">https://projects.gentoo.org/council/meeting-logs/20191013-summary.txt</a></p>
</dd>
<dt class="field-odd">Reported</dt>
<dd class="field-odd"><p>by pkgcheck</p>
</dd>
</dl>
<p>Underscores are reserved for USE_EXPAND flags, and must not be used
within names of newly-defined regular flags. Existing uses are
considered technically valid, and phasing them out has low priority.</p>
<p>Flags that attempt to resemble USE_EXPAND should be either converted
into proper (global) USE_EXPAND, or made into shorter (unprefixed)
local flags. In other flags, replacing underscore with hyphen is
recommended.</p>
<p><em>Rationale</em>: a few packages in Gentoo attempted to imitate USE_EXPAND
via local USE flags. This has no clear advantage, may be confusing
to end users who assume that they will work like USE_EXPAND
and in the end unnecessarily lengthens flag names or even causes
unnecessary mismatches between global flags and local flags.</p>
<p>Extending the rule to all flags containing underscores aims to make
distinguishing USE_EXPAND and regular flags easier. It also improves
consistency between flag names that historically used hyphens
or underscores depending on developer’s personal preference.</p>
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