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  <div class="section" id="install-options">
<h1>Install Options<a class="headerlink" href="#install-options" title="Permalink to this headline">¶</a></h1>
<p>When installing Imath from source, take note of the following CMake options:</p>
<dl class="simple">
<dt><code class="docutils literal notranslate"><span class="pre">IMATH_CXX_STANDARD</span></code></dt><dd><p>C++ standard to compile against. Default is <code class="docutils literal notranslate"><span class="pre">14</span></code>.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">IMATH_HALF_USE_LOOKUP_TABLE</span></code></dt><dd><p>Use the half-to-float conversion lookup table. Default is <code class="docutils literal notranslate"><span class="pre">ON</span></code> for
backwards compatibility. With the value of <code class="docutils literal notranslate"><span class="pre">OFF</span></code>, use a bit-shift
conversion algorithm. Note that this setting is overriden when
compiler flags enable the F16C SSE instruction set.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">IMATH_USE_DEFAULT_VISIBILITY</span></code></dt><dd><p>Use default visibility, which makes all symbols visible in compiled
objects.  Default is <code class="docutils literal notranslate"><span class="pre">OFF</span></code>, in which case only designated
necessary symbols are marked for export.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">IMATH_USE_NOEXCEPT</span></code></dt><dd><p>Use the <code class="docutils literal notranslate"><span class="pre">noexcept</span></code> specifier of appropriate methods. Default is
<code class="docutils literal notranslate"><span class="pre">ON</span></code>.  With the value of <code class="docutils literal notranslate"><span class="pre">OFF</span></code>, the <code class="docutils literal notranslate"><span class="pre">noexcept</span></code> specifier is
omitted, for situations in which it is not desireable.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">IMATH_ENABLE_LARGE_STACK</span></code></dt><dd><p>Enables the <code class="docutils literal notranslate"><span class="pre">halfFunction</span></code> object to place the lookup tables on
the stack rather than allocating heap memory. Default is <code class="docutils literal notranslate"><span class="pre">OFF</span></code>.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">IMATH_VERSION_RELEASE_TYPE</span></code></dt><dd><p>A string to append to the version
number in the internal package name macro
IMATH_PACKAGE_STRING. Default is the empty string, but can be set
to, for example, “-dev” during development (e.g. “3.1.0-dev”).</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">IMATH_INSTALL_SYM_LINK</span></code></dt><dd><p>Install an unversioned symbolic link (i.e. libImath.so) to the
versioned library.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">IMATH_INSTALL_PKG_CONFIG</span></code></dt><dd><p>Install Imath.pc file. Default is <code class="docutils literal notranslate"><span class="pre">ON</span></code>.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">IMATH_NAMESPACE</span></code></dt><dd><p>Public namespace alias for Imath. Default is <code class="docutils literal notranslate"><span class="pre">Imath</span></code>.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">IMATH_INTERNAL_NAMESPACE</span></code></dt><dd><p>Real namespace for Imath that will end up in compiled
symbols. Default is <code class="docutils literal notranslate"><span class="pre">Imath_&lt;major&gt;_&lt;minor&gt;</span></code>.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">IMATH_NAMESPACE_CUSTOM</span></code></dt><dd><p>Whether the namespace has been customized (so external users
know). Default is <code class="docutils literal notranslate"><span class="pre">NO</span></code>.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">IMATH_LIB_SUFFIX</span></code></dt><dd><p>String added to the end of all the versioned libraries. Default is
<code class="docutils literal notranslate"><span class="pre">-&lt;major&gt;_&lt;minor&gt;</span></code></p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">IMATH_OUTPUT_SUBDIR</span></code></dt><dd><p>Destination sub-folder of the include path for install. Default is <code class="docutils literal notranslate"><span class="pre">Imath</span></code>.</p>
</dd>
</dl>
<p>To enable half-to-float conversion using the F16C SSE instruction set
for g++ and clang when installing Imath, add the <code class="docutils literal notranslate"><span class="pre">-mf16c</span></code> compiler
option:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="o">%</span> <span class="n">cmake</span> <span class="o">&lt;</span><span class="n">Imath</span> <span class="n">source</span> <span class="n">directory</span><span class="o">&gt;</span> <span class="o">-</span><span class="n">DCMAKE_CXX_FLAGS</span><span class="o">=</span><span class="s2">&quot;-mf16c&quot;</span>
</pre></div>
</div>
<p>See <a class="reference internal" href="half_conversion.html#half-float-conversion-configuration-options"><span class="std std-ref">half-float Conversion Configuration Options</span></a> for more
information about the half-float conversion process.</p>
</div>


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