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  <section id="add-compile-definitions">
<span id="command:add_compile_definitions"></span><h1>add_compile_definitions<a class="headerlink" href="#add-compile-definitions" title="Permalink to this heading">¶</a></h1>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.12.</span></p>
</div>
<p>Add preprocessor definitions to the compilation of source files.</p>
<div class="highlight-cmake notranslate"><div class="highlight"><pre><span></span><span class="nf">add_compile_definitions(</span><span class="nv">&lt;definition&gt;</span><span class="w"> </span><span class="p">...</span><span class="nf">)</span><span class="w"></span>
</pre></div>
</div>
<p>Adds preprocessor definitions to the compiler command line.</p>
<p>The preprocessor definitions are added to the <span class="target" id="index-0-prop_dir:COMPILE_DEFINITIONS"></span><a class="reference internal" href="../prop_dir/COMPILE_DEFINITIONS.html#prop_dir:COMPILE_DEFINITIONS" title="COMPILE_DEFINITIONS"><code class="xref cmake cmake-prop_dir docutils literal notranslate"><span class="pre">COMPILE_DEFINITIONS</span></code></a>
directory property for the current <code class="docutils literal notranslate"><span class="pre">CMakeLists</span></code> file. They are also added to
the <span class="target" id="index-0-prop_tgt:COMPILE_DEFINITIONS"></span><a class="reference internal" href="../prop_tgt/COMPILE_DEFINITIONS.html#prop_tgt:COMPILE_DEFINITIONS" title="COMPILE_DEFINITIONS"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre">COMPILE_DEFINITIONS</span></code></a> target property for each target in the
current <code class="docutils literal notranslate"><span class="pre">CMakeLists</span></code> file.</p>
<p>Definitions are specified using the syntax <code class="docutils literal notranslate"><span class="pre">VAR</span></code> or <code class="docutils literal notranslate"><span class="pre">VAR=value</span></code>.
Function-style definitions are not supported. CMake will automatically
escape the value correctly for the native build system (note that CMake
language syntax may require escapes to specify some values).</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.26: </span>Any leading <code class="docutils literal notranslate"><span class="pre">-D</span></code> on an item will be removed.</p>
</div>
<p>Arguments to <code class="docutils literal notranslate"><span class="pre">add_compile_definitions</span></code> may use generator expressions
with the syntax <code class="docutils literal notranslate"><span class="pre">$&lt;...&gt;</span></code>. See the <span class="target" id="index-0-manual:cmake-generator-expressions(7)"></span><a class="reference internal" href="../manual/cmake-generator-expressions.7.html#manual:cmake-generator-expressions(7)" title="cmake-generator-expressions(7)"><code class="xref cmake cmake-manual docutils literal notranslate"><span class="pre">cmake-generator-expressions(7)</span></code></a>
manual for available expressions.  See the <span class="target" id="index-1-manual:cmake-buildsystem(7)"></span><a class="reference internal" href="../manual/cmake-buildsystem.7.html#manual:cmake-buildsystem(7)" title="cmake-buildsystem(7)"><code class="xref cmake cmake-manual docutils literal notranslate"><span class="pre">cmake-buildsystem(7)</span></code></a> manual
for more on defining buildsystem properties.</p>
<section id="see-also">
<h2>See Also<a class="headerlink" href="#see-also" title="Permalink to this heading">¶</a></h2>
<ul class="simple">
<li><p>The command <span class="target" id="index-0-command:target_compile_definitions"></span><a class="reference internal" href="target_compile_definitions.html#command:target_compile_definitions" title="target_compile_definitions"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">target_compile_definitions()</span></code></a> adds target-specific definitions.</p></li>
</ul>
</section>
</section>


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