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<section id="add-definitions">
<span id="command:add_definitions"></span><h1>add_definitions<a class="headerlink" href="#add-definitions" title="Permalink to this heading"></a></h1>
<p>Add <code class="docutils literal notranslate"><span class="pre">-D</span></code> define flags to the compilation of source files.</p>
<div class="highlight-cmake notranslate"><div class="highlight"><pre><span></span><span class="nf">add_definitions(</span><span class="p">-</span><span class="no">DFOO</span><span class="w"> </span><span class="p">-</span><span class="no">DBAR</span><span class="w"> </span><span class="p">...</span><span class="nf">)</span>
</pre></div>
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<p>Adds definitions to the compiler command line for targets in the current
directory, whether added before or after this command is invoked, and for
the ones in sub-directories added after. This command can be used to add any
flags, but it is intended to add preprocessor definitions.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>This command has been superseded by alternatives:</p>
<ul class="simple">
<li><p>Use <span class="target" id="index-0-command:add_compile_definitions"></span><a class="reference internal" href="add_compile_definitions.html#command:add_compile_definitions" title="add_compile_definitions"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">add_compile_definitions()</span></code></a> to add preprocessor definitions.</p></li>
<li><p>Use <span class="target" id="index-0-command:include_directories"></span><a class="reference internal" href="include_directories.html#command:include_directories" title="include_directories"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">include_directories()</span></code></a> to add include directories.</p></li>
<li><p>Use <span class="target" id="index-0-command:add_compile_options"></span><a class="reference internal" href="add_compile_options.html#command:add_compile_options" title="add_compile_options"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">add_compile_options()</span></code></a> to add other options.</p></li>
</ul>
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<p>Flags beginning in <code class="docutils literal notranslate"><span class="pre">-D</span></code> or <code class="docutils literal notranslate"><span class="pre">/D</span></code> that look like preprocessor definitions are
automatically 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 directory. Definitions with non-trivial values
may be left in the set of flags instead of being converted for reasons of
backwards compatibility. See documentation of the
<span class="target" id="index-1-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">directory</span></code></a>,
<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">target</span></code></a>,
<span class="target" id="index-0-prop_sf:COMPILE_DEFINITIONS"></span><a class="reference internal" href="../prop_sf/COMPILE_DEFINITIONS.html#prop_sf:COMPILE_DEFINITIONS" title="COMPILE_DEFINITIONS"><code class="xref cmake cmake-prop_sf docutils literal notranslate"><span class="pre">source</span> <span class="pre">file</span></code></a> <code class="docutils literal notranslate"><span class="pre">COMPILE_DEFINITIONS</span></code>
properties for details on adding preprocessor definitions to specific
scopes and configurations.</p>
<section id="see-also">
<h2>See Also<a class="headerlink" href="#see-also" title="Permalink to this heading"></a></h2>
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<li><p>The <span class="target" id="index-0-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></li>
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