x-1-prop_tgt:&lt;LANG&gt;_STANDARD"></span><a class="reference internal" href="LANG_STANDARD.html#prop_tgt:&lt;LANG&gt;_STANDARD" title="&lt;LANG&gt;_STANDARD"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre">&lt;LANG&gt;_STANDARD</span></code></a> target
property is treated as optional and may &quot;decay&quot; to a previous standard if the
requested standard is not available.  When <code class="docutils literal notranslate"><span class="pre">&lt;LANG&gt;_STANDARD_REQU