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<section id="objc-standard">
<span id="prop_tgt:OBJC_STANDARD"></span><h1>OBJC_STANDARD<a class="headerlink" href="#objc-standard" title="Permalink to this heading">ΒΆ</a></h1>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.16.</span></p>
</div>
<p>The OBJC standard whose features are requested to build this target.</p>
<p>This property specifies the OBJC standard whose features are requested
to build this target. For some compilers, this results in adding a
flag such as <code class="docutils literal notranslate"><span class="pre">-std=gnu11</span></code> to the compile line.</p>
<p>Supported values are:</p>
<dl class="simple">
<dt><code class="docutils literal notranslate"><span class="pre">90</span></code></dt><dd><p>Objective C89/C90</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">99</span></code></dt><dd><p>Objective C99</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">11</span></code></dt><dd><p>Objective C11</p>
</dd>
</dl>
<p>If the value requested does not result in a compile flag being added for
the compiler in use, a previous standard flag will be added instead. This
means that using:</p>
<div class="highlight-cmake notranslate"><div class="highlight"><pre><span></span><span class="nf">set_property(</span><span class="no">TARGET</span><span class="w"> </span><span class="nb">tgt</span><span class="w"> </span><span class="no">PROPERTY</span><span class="w"> </span><span class="no">OBJC_STANDARD</span><span class="w"> </span><span class="m">11</span><span class="nf">)</span><span class="w"></span>
</pre></div>
</div>
<p>with a compiler which does not support <code class="docutils literal notranslate"><span class="pre">-std=gnu11</span></code> or an equivalent
flag will not result in an error or warning, but will instead add the
<code class="docutils literal notranslate"><span class="pre">-std=gnu99</span></code> or <code class="docutils literal notranslate"><span class="pre">-std=gnu90</span></code> flag if supported. This "decay" behavior may
be controlled with the <span class="target" id="index-0-prop_tgt:OBJC_STANDARD_REQUIRED"></span><a class="reference internal" href="OBJC_STANDARD_REQUIRED.html#prop_tgt:OBJC_STANDARD_REQUIRED" title="OBJC_STANDARD_REQUIRED"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre">OBJC_STANDARD_REQUIRED</span></code></a> target property.
Additionally, the <span class="target" id="index-0-prop_tgt:OBJC_EXTENSIONS"></span><a class="reference internal" href="OBJC_EXTENSIONS.html#prop_tgt:OBJC_EXTENSIONS" title="OBJC_EXTENSIONS"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre">OBJC_EXTENSIONS</span></code></a> target property may be used to
control whether compiler-specific extensions are enabled on a per-target basis.</p>
<p>If the property is not set, and the project has set the <span class="target" id="index-0-prop_tgt:C_STANDARD"></span><a class="reference internal" href="C_STANDARD.html#prop_tgt:C_STANDARD" title="C_STANDARD"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre">C_STANDARD</span></code></a>,
the value of <span class="target" id="index-1-prop_tgt:C_STANDARD"></span><a class="reference internal" href="C_STANDARD.html#prop_tgt:C_STANDARD" title="C_STANDARD"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre">C_STANDARD</span></code></a> is set for <code class="docutils literal notranslate"><span class="pre">OBJC_STANDARD</span></code>.</p>
<p>See the <span class="target" id="index-0-manual:cmake-compile-features(7)"></span><a class="reference internal" href="../manual/cmake-compile-features.7.html#manual:cmake-compile-features(7)" title="cmake-compile-features(7)"><code class="xref cmake cmake-manual docutils literal notranslate"><span class="pre">cmake-compile-features(7)</span></code></a> manual for information on
compile features and a list of supported compilers.</p>
<p>This property is initialized by the value of
the <span class="target" id="index-0-variable:CMAKE_OBJC_STANDARD"></span><a class="reference internal" href="../variable/CMAKE_OBJC_STANDARD.html#variable:CMAKE_OBJC_STANDARD" title="CMAKE_OBJC_STANDARD"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_OBJC_STANDARD</span></code></a> variable if it is set when a target
is created.</p>
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