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  <section id="cmp0125">
<span id="policy:CMP0125"></span><h1>CMP0125<a class="headerlink" href="#cmp0125" title="Permalink to this heading">ΒΆ</a></h1>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.21.</span></p>
</div>
<p>The <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>, <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>, <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> and
<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> commands cache their result in the variable specified
by their first argument.  Prior to CMake 3.21, if a cache variable of that
name already existed before the call but the cache variable had no type, any
non-cache variable of the same name would be discarded and the cache variable
was always used (see also <span class="target" id="index-0-policy:CMP0126"></span><a class="reference internal" href="CMP0126.html#policy:CMP0126" title="CMP0126"><code class="xref cmake cmake-policy docutils literal notranslate"><span class="pre">CMP0126</span></code></a> for a different but similar
behavior).  This contradicts the convention that a non-cache variable should
take precedence over a cache variable of the same name.  Such a situation can
arise if a user sets a cache variable on the command line without specifying
a type, such as <code class="docutils literal notranslate"><span class="pre">cmake</span> <span class="pre">-DMYVAR=blah</span> <span class="pre">...</span></code> instead of
<code class="docutils literal notranslate"><span class="pre">cmake</span> <span class="pre">-DMYVAR:FILEPATH=blah</span></code>.</p>
<p>Related to the above, if a cache variable of the specified name already exists
and it <em>does</em> have a type, the various <code class="docutils literal notranslate"><span class="pre">find_...()</span></code> commands would return
that value unchanged.  In particular, if it contained a relative path, it
would not be converted to an absolute path in this situation.</p>
<p>When policy <code class="docutils literal notranslate"><span class="pre">CMP0125</span></code> is set to <code class="docutils literal notranslate"><span class="pre">OLD</span></code> or is unset, the behavior is as
described above.  When it is set to <code class="docutils literal notranslate"><span class="pre">NEW</span></code>, the behavior is as follows:</p>
<ul class="simple">
<li><p>If a non-cache variable of the specified name exists when the <code class="docutils literal notranslate"><span class="pre">find_...()</span></code>
command is called, its value will be used regardless of whether a cache
variable of the same name already exists or not.  A cache variable will not
be created in this case if no such cache variable existed before.
If a cache variable of the specified name did already exist, the cache will
be updated to match the non-cache variable.</p></li>
<li><p>The various <code class="docutils literal notranslate"><span class="pre">find...()</span></code> commands will always provide an absolute path in
the result variable, except where a relative path provided by a cache or
non-cache variable cannot be resolved to an existing path.</p></li>
</ul>
<p>This policy was introduced in CMake version 3.21. Use the
<span class="target" id="index-0-command:cmake_policy"></span><a class="reference internal" href="../command/cmake_policy.html#command:cmake_policy" title="cmake_policy"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">cmake_policy()</span></code></a> command to set it to <code class="docutils literal notranslate"><span class="pre">OLD</span></code> or <code class="docutils literal notranslate"><span class="pre">NEW</span></code> explicitly.
Unlike many policies, CMake version 3.26.5 does <em>not</em> warn when the policy
is not set and simply uses <code class="docutils literal notranslate"><span class="pre">OLD</span></code> behavior.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>The <code class="docutils literal notranslate"><span class="pre">OLD</span></code> behavior of a policy is
<span class="target" id="index-0-manual:cmake-policies(7)"></span><a class="reference internal" href="../manual/cmake-policies.7.html#manual:cmake-policies(7)" title="cmake-policies(7)"><code class="xref cmake cmake-manual docutils literal notranslate"><span class="pre">deprecated</span> <span class="pre">by</span> <span class="pre">definition</span></code></a>
and may be removed in a future version of CMake.</p>
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