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<section id="cmp0128">
<span id="policy:CMP0128"></span><h1>CMP0128<a class="headerlink" href="#cmp0128" title="Permalink to this heading">ΒΆ</a></h1>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.22.</span></p>
</div>
<p>When this policy is set to <code class="docutils literal notranslate"><span class="pre">NEW</span></code>:</p>
<ul class="simple">
<li><p><span class="target" id="index-0-prop_tgt:<LANG>_EXTENSIONS"></span><a class="reference internal" href="../prop_tgt/LANG_EXTENSIONS.html#prop_tgt:<LANG>_EXTENSIONS" title="<LANG>_EXTENSIONS"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre"><LANG>_EXTENSIONS</span></code></a> is initialized to
<span class="target" id="index-0-variable:CMAKE_<LANG>_EXTENSIONS"></span><a class="reference internal" href="../variable/CMAKE_LANG_EXTENSIONS.html#variable:CMAKE_<LANG>_EXTENSIONS" title="CMAKE_<LANG>_EXTENSIONS"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_<LANG>_EXTENSIONS</span></code></a> if set, otherwise falling back to
<span class="target" id="index-0-variable:CMAKE_<LANG>_EXTENSIONS_DEFAULT"></span><a class="reference internal" href="../variable/CMAKE_LANG_EXTENSIONS_DEFAULT.html#variable:CMAKE_<LANG>_EXTENSIONS_DEFAULT" title="CMAKE_<LANG>_EXTENSIONS_DEFAULT"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_<LANG>_EXTENSIONS_DEFAULT</span></code></a>.</p></li>
<li><p>Extensions are correctly enabled/disabled if <span class="target" id="index-0-prop_tgt:<LANG>_STANDARD"></span><a class="reference internal" href="../prop_tgt/LANG_STANDARD.html#prop_tgt:<LANG>_STANDARD" title="<LANG>_STANDARD"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre"><LANG>_STANDARD</span></code></a> is
unset or satisfied by the default.</p></li>
<li><p>Standard mode-affecting flags aren't added unless necessary to achieve the
specified mode.</p></li>
</ul>
<p>The <code class="docutils literal notranslate"><span class="pre">OLD</span></code> behavior:</p>
<ul class="simple">
<li><p>Initializes <span class="target" id="index-1-prop_tgt:<LANG>_EXTENSIONS"></span><a class="reference internal" href="../prop_tgt/LANG_EXTENSIONS.html#prop_tgt:<LANG>_EXTENSIONS" title="<LANG>_EXTENSIONS"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre"><LANG>_EXTENSIONS</span></code></a> to
<span class="target" id="index-1-variable:CMAKE_<LANG>_EXTENSIONS"></span><a class="reference internal" href="../variable/CMAKE_LANG_EXTENSIONS.html#variable:CMAKE_<LANG>_EXTENSIONS" title="CMAKE_<LANG>_EXTENSIONS"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_<LANG>_EXTENSIONS</span></code></a> if set, otherwise falling back to <code class="docutils literal notranslate"><span class="pre">ON</span></code>.</p></li>
<li><p>Always adds a flag if <span class="target" id="index-1-prop_tgt:<LANG>_STANDARD"></span><a class="reference internal" href="../prop_tgt/LANG_STANDARD.html#prop_tgt:<LANG>_STANDARD" title="<LANG>_STANDARD"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre"><LANG>_STANDARD</span></code></a> is set and
<span class="target" id="index-0-prop_tgt:<LANG>_STANDARD_REQUIRED"></span><a class="reference internal" href="../prop_tgt/LANG_STANDARD_REQUIRED.html#prop_tgt:<LANG>_STANDARD_REQUIRED" title="<LANG>_STANDARD_REQUIRED"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre"><LANG>_STANDARD_REQUIRED</span></code></a> is <code class="docutils literal notranslate"><span class="pre">OFF</span></code>.</p></li>
<li><p>If <span class="target" id="index-2-prop_tgt:<LANG>_STANDARD"></span><a class="reference internal" href="../prop_tgt/LANG_STANDARD.html#prop_tgt:<LANG>_STANDARD" title="<LANG>_STANDARD"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre"><LANG>_STANDARD</span></code></a> is unset:</p>
<ul>
<li><p>Doesn't disable extensions even if <span class="target" id="index-2-prop_tgt:<LANG>_EXTENSIONS"></span><a class="reference internal" href="../prop_tgt/LANG_EXTENSIONS.html#prop_tgt:<LANG>_EXTENSIONS" title="<LANG>_EXTENSIONS"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre"><LANG>_EXTENSIONS</span></code></a> is
<code class="docutils literal notranslate"><span class="pre">OFF</span></code>.</p></li>
<li><p>Fails to enable extensions if <span class="target" id="index-3-prop_tgt:<LANG>_EXTENSIONS"></span><a class="reference internal" href="../prop_tgt/LANG_EXTENSIONS.html#prop_tgt:<LANG>_EXTENSIONS" title="<LANG>_EXTENSIONS"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre"><LANG>_EXTENSIONS</span></code></a> is <code class="docutils literal notranslate"><span class="pre">ON</span></code>
except for the <code class="docutils literal notranslate"><span class="pre">IAR</span></code> compiler.</p></li>
</ul>
</li>
</ul>
<p>Code may need to be updated for the <code class="docutils literal notranslate"><span class="pre">NEW</span></code> behavior in the following cases:</p>
<ul>
<li><p>If a standard mode flag previously overridden by CMake's and not used during
compiler detection now takes effect due to CMake no longer adding one as the
default detected is appropriate.</p>
<p>Such code should be converted to either:</p>
<ul class="simple">
<li><p>Use <span class="target" id="index-3-prop_tgt:<LANG>_STANDARD"></span><a class="reference internal" href="../prop_tgt/LANG_STANDARD.html#prop_tgt:<LANG>_STANDARD" title="<LANG>_STANDARD"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre"><LANG>_STANDARD</span></code></a> and <span class="target" id="index-4-prop_tgt:<LANG>_EXTENSIONS"></span><a class="reference internal" href="../prop_tgt/LANG_EXTENSIONS.html#prop_tgt:<LANG>_EXTENSIONS" title="<LANG>_EXTENSIONS"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre"><LANG>_EXTENSIONS</span></code></a> instead
of manually adding flags.</p></li>
<li><p>Or ensure the manually-specified flags are used during compiler detection.</p></li>
</ul>
</li>
<li><p>If extensions were disabled without <span class="target" id="index-4-prop_tgt:<LANG>_STANDARD"></span><a class="reference internal" href="../prop_tgt/LANG_STANDARD.html#prop_tgt:<LANG>_STANDARD" title="<LANG>_STANDARD"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre"><LANG>_STANDARD</span></code></a> being set
CMake previously wouldn't actually disable extensions.</p>
<p>Such code should be updated to not disable extensions if they are required.</p>
</li>
<li><p>If extensions were enabled/disabled when <span class="target" id="index-5-prop_tgt:<LANG>_STANDARD"></span><a class="reference internal" href="../prop_tgt/LANG_STANDARD.html#prop_tgt:<LANG>_STANDARD" title="<LANG>_STANDARD"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre"><LANG>_STANDARD</span></code></a> was
satisfied by the compiler's default CMake previously wouldn't actually
enable/disable extensions.</p>
<p>Such code should be updated to set the correct extensions mode.</p>
</li>
</ul>
<p>If compiler flags affecting the standard mode are used during compiler
detection (for example in <span class="target" id="index-0-manual:cmake-toolchains(7)"></span><a class="reference internal" href="../manual/cmake-toolchains.7.html#manual:cmake-toolchains(7)" title="cmake-toolchains(7)"><code class="xref cmake cmake-manual docutils literal notranslate"><span class="pre">a</span> <span class="pre">toolchain</span> <span class="pre">file</span></code></a>
using <span class="target" id="index-0-variable:CMAKE_<LANG>_FLAGS_INIT"></span><a class="reference internal" href="../variable/CMAKE_LANG_FLAGS_INIT.html#variable:CMAKE_<LANG>_FLAGS_INIT" title="CMAKE_<LANG>_FLAGS_INIT"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_<LANG>_FLAGS_INIT</span></code></a>) then they will affect the detected
default <span class="target" id="index-0-variable:CMAKE_<LANG>_STANDARD_DEFAULT"></span><a class="reference internal" href="../variable/CMAKE_LANG_STANDARD_DEFAULT.html#variable:CMAKE_<LANG>_STANDARD_DEFAULT" title="CMAKE_<LANG>_STANDARD_DEFAULT"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">standard</span></code></a> and
<span class="target" id="index-1-variable:CMAKE_<LANG>_EXTENSIONS_DEFAULT"></span><a class="reference internal" href="../variable/CMAKE_LANG_EXTENSIONS_DEFAULT.html#variable:CMAKE_<LANG>_EXTENSIONS_DEFAULT" title="CMAKE_<LANG>_EXTENSIONS_DEFAULT"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">extensions</span></code></a>.</p>
<p>Unlike many policies, CMake version 3.26.5 does <em>not</em> warn when the policy
is not set and simply uses the <code class="docutils literal notranslate"><span class="pre">OLD</span></code> behavior. 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.
See documentation of the
<span class="target" id="index-0-variable:CMAKE_POLICY_WARNING_CMP<NNNN>"></span><a class="reference internal" href="../variable/CMAKE_POLICY_WARNING_CMPNNNN.html#variable:CMAKE_POLICY_WARNING_CMP<NNNN>" title="CMAKE_POLICY_WARNING_CMP<NNNN>"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_POLICY_WARNING_CMP0128</span></code></a>
variable to control the warning.</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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