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<span id="policy:CMP0047"></span><h1>CMP0047<a class="headerlink" href="#cmp0047" title="Permalink to this headline">¶</a></h1>
<p>Use <code class="docutils literal"><span class="pre">QCC</span></code> compiler id for the qcc drivers on QNX.</p>
<p>CMake 3.0 and above recognize that the QNX qcc compiler driver is
different from the GNU compiler.
CMake now prefers to present this to projects by setting the
<span class="target" id="index-0-variable:CMAKE_<LANG>_COMPILER_ID"></span><a class="reference internal" href="../variable/CMAKE_LANG_COMPILER_ID.html#variable:CMAKE_<LANG>_COMPILER_ID" title="CMAKE_<LANG>_COMPILER_ID"><code class="xref cmake cmake-variable docutils literal"><span class="pre">CMAKE_<LANG>_COMPILER_ID</span></code></a> variable to <code class="docutils literal"><span class="pre">QCC</span></code> instead
of <code class="docutils literal"><span class="pre">GNU</span></code>. However, existing projects may assume the compiler id for
QNX qcc is just <code class="docutils literal"><span class="pre">GNU</span></code> as it was in CMake versions prior to 3.0.
Therefore this policy determines for QNX qcc which compiler id to
report in the <span class="target" id="index-1-variable:CMAKE_<LANG>_COMPILER_ID"></span><a class="reference internal" href="../variable/CMAKE_LANG_COMPILER_ID.html#variable:CMAKE_<LANG>_COMPILER_ID" title="CMAKE_<LANG>_COMPILER_ID"><code class="xref cmake cmake-variable docutils literal"><span class="pre">CMAKE_<LANG>_COMPILER_ID</span></code></a> variable after
language <code class="docutils literal"><span class="pre"><LANG></span></code> is enabled by the <span class="target" id="index-0-command:project"></span><a class="reference internal" href="../command/project.html#command:project" title="project"><code class="xref cmake cmake-command docutils literal"><span class="pre">project()</span></code></a> or
<span class="target" id="index-0-command:enable_language"></span><a class="reference internal" href="../command/enable_language.html#command:enable_language" title="enable_language"><code class="xref cmake cmake-command docutils literal"><span class="pre">enable_language()</span></code></a> command. The policy must be set prior
to the invocation of either command.</p>
<p>The OLD behavior for this policy is to use the <code class="docutils literal"><span class="pre">GNU</span></code> compiler id
for the qcc and QCC compiler drivers. The NEW behavior for this policy
is to use the <code class="docutils literal"><span class="pre">QCC</span></code> compiler id for those drivers.</p>
<p>This policy was introduced in CMake version 3.0. 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"><span class="pre">cmake_policy()</span></code></a> command to set this policy to OLD or NEW explicitly.
Unlike most policies, CMake version 3.8.2 does <em>not</em> warn
by default when this policy is not set and simply uses OLD behavior.
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"><span class="pre">CMAKE_POLICY_WARNING_CMP0047</span></code></a>
variable to control the warning.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">The <code class="docutils literal"><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"><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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