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<section id="cmake-ignore-path">
<span id="variable:CMAKE_IGNORE_PATH"></span><h1>CMAKE_IGNORE_PATH<a class="headerlink" href="#cmake-ignore-path" title="Permalink to this heading">ΒΆ</a></h1>
<p><a class="reference internal" href="../manual/cmake-language.7.html#cmake-language-lists"><span class="std std-ref">Semicolon-separated list</span></a> of directories
to be ignored by the various <code class="docutils literal notranslate"><span class="pre">find...()</span></code> commands.</p>
<p>For <span class="target" id="index-0-command:find_program"></span><a class="reference internal" href="../command/find_program.html#command:find_program" title="find_program"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">find_program()</span></code></a>, <span class="target" id="index-0-command:find_library"></span><a class="reference internal" href="../command/find_library.html#command:find_library" title="find_library"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">find_library()</span></code></a>, <span class="target" id="index-0-command:find_file"></span><a class="reference internal" href="../command/find_file.html#command:find_file" title="find_file"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">find_file()</span></code></a>,
and <span class="target" id="index-0-command:find_path"></span><a class="reference internal" href="../command/find_path.html#command:find_path" title="find_path"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">find_path()</span></code></a>, any file found in one of the listed directories
will be ignored. The listed directories do not apply recursively, so any
subdirectories to be ignored must also be explicitly listed.
<code class="docutils literal notranslate"><span class="pre">CMAKE_IGNORE_PATH</span></code> does not affect the search <em>prefixes</em> used by these
four commands. To ignore individual paths under a search prefix
(e.g. <code class="docutils literal notranslate"><span class="pre">bin</span></code>, <code class="docutils literal notranslate"><span class="pre">include</span></code>, <code class="docutils literal notranslate"><span class="pre">lib</span></code>, etc.), each path must be listed in
<code class="docutils literal notranslate"><span class="pre">CMAKE_IGNORE_PATH</span></code> as a full absolute path. <span class="target" id="index-1-variable:CMAKE_IGNORE_PREFIX_PATH"></span><a class="reference internal" href="CMAKE_IGNORE_PREFIX_PATH.html#variable:CMAKE_IGNORE_PREFIX_PATH" title="CMAKE_IGNORE_PREFIX_PATH"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_IGNORE_PREFIX_PATH</span></code></a>
provides a more appropriate way to ignore a whole search prefix.</p>
<p><span class="target" id="index-0-command:find_package"></span><a class="reference internal" href="../command/find_package.html#command:find_package" title="find_package"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">find_package()</span></code></a> is also affected by <code class="docutils literal notranslate"><span class="pre">CMAKE_IGNORE_PATH</span></code>, but only
for <em>Config mode</em> searches. Any <code class="docutils literal notranslate"><span class="pre"><Name>Config.cmake</span></code> or
<code class="docutils literal notranslate"><span class="pre"><name>-config.cmake</span></code> file found in one of the specified directories
will be ignored. In addition, any search <em>prefix</em> found in <code class="docutils literal notranslate"><span class="pre">CMAKE_IGNORE_PATH</span></code>
will be skipped for backward compatibility reasons, but new code should
prefer to use <span class="target" id="index-2-variable:CMAKE_IGNORE_PREFIX_PATH"></span><a class="reference internal" href="CMAKE_IGNORE_PREFIX_PATH.html#variable:CMAKE_IGNORE_PREFIX_PATH" title="CMAKE_IGNORE_PREFIX_PATH"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_IGNORE_PREFIX_PATH</span></code></a> to ignore prefixes instead.</p>
<p>Ignoring search locations can be useful in cross-compiling environments where
some system directories contain incompatible but possibly linkable libraries.
For example, on cross-compiled cluster environments, this allows a user to
ignore directories containing libraries meant for the front-end machine.</p>
<p>By default, <code class="docutils literal notranslate"><span class="pre">CMAKE_IGNORE_PATH</span></code> is empty. It is intended to be set by the
project or the end user.</p>
<p>See also the following variables:</p>
<ul class="simple">
<li><p><span class="target" id="index-3-variable:CMAKE_IGNORE_PREFIX_PATH"></span><a class="reference internal" href="CMAKE_IGNORE_PREFIX_PATH.html#variable:CMAKE_IGNORE_PREFIX_PATH" title="CMAKE_IGNORE_PREFIX_PATH"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_IGNORE_PREFIX_PATH</span></code></a></p></li>
<li><p><span class="target" id="index-0-variable:CMAKE_SYSTEM_IGNORE_PATH"></span><a class="reference internal" href="CMAKE_SYSTEM_IGNORE_PATH.html#variable:CMAKE_SYSTEM_IGNORE_PATH" title="CMAKE_SYSTEM_IGNORE_PATH"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_SYSTEM_IGNORE_PATH</span></code></a></p></li>
<li><p><span class="target" id="index-0-variable:CMAKE_PREFIX_PATH"></span><a class="reference internal" href="CMAKE_PREFIX_PATH.html#variable:CMAKE_PREFIX_PATH" title="CMAKE_PREFIX_PATH"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_PREFIX_PATH</span></code></a></p></li>
<li><p><span class="target" id="index-0-variable:CMAKE_LIBRARY_PATH"></span><a class="reference internal" href="CMAKE_LIBRARY_PATH.html#variable:CMAKE_LIBRARY_PATH" title="CMAKE_LIBRARY_PATH"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_LIBRARY_PATH</span></code></a></p></li>
<li><p><span class="target" id="index-0-variable:CMAKE_INCLUDE_PATH"></span><a class="reference internal" href="CMAKE_INCLUDE_PATH.html#variable:CMAKE_INCLUDE_PATH" title="CMAKE_INCLUDE_PATH"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_INCLUDE_PATH</span></code></a></p></li>
<li><p><span class="target" id="index-0-variable:CMAKE_PROGRAM_PATH"></span><a class="reference internal" href="CMAKE_PROGRAM_PATH.html#variable:CMAKE_PROGRAM_PATH" title="CMAKE_PROGRAM_PATH"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_PROGRAM_PATH</span></code></a></p></li>
</ul>
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