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| <div class="section" id="cmp0117"> |
| <span id="policy:CMP0117"></span><h1>CMP0117<a class="headerlink" href="#cmp0117" title="Permalink to this headline">ΒΆ</a></h1> |
| <div class="versionadded"> |
| <p><span class="versionmodified added">New in version 3.20.</span></p> |
| </div> |
| <p>MSVC RTTI flag <code class="docutils literal notranslate"><span class="pre">/GR</span></code> is not added to |
| <span class="target" id="index-0-variable:CMAKE_<LANG>_FLAGS"></span><a class="reference internal" href="../variable/CMAKE_LANG_FLAGS.html#variable:CMAKE_<LANG>_FLAGS" title="CMAKE_<LANG>_FLAGS"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_CXX_FLAGS</span></code></a> by default.</p> |
| <p>When using MSVC-like compilers in CMake 3.19 and below, the RTTI flag |
| <code class="docutils literal notranslate"><span class="pre">/GR</span></code> is added to <span class="target" id="index-1-variable:CMAKE_<LANG>_FLAGS"></span><a class="reference internal" href="../variable/CMAKE_LANG_FLAGS.html#variable:CMAKE_<LANG>_FLAGS" title="CMAKE_<LANG>_FLAGS"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_CXX_FLAGS</span></code></a> by |
| default. This behavior is left from support for MSVC versions from Visual |
| Studio 2003 and below that did not enable RTTI by default. It is no longer |
| necessary. Furthermore, it is problematic for projects that want to change |
| to <code class="docutils literal notranslate"><span class="pre">/GR-</span></code> programmatically. In particular, it requires string editing of |
| the <span class="target" id="index-2-variable:CMAKE_<LANG>_FLAGS"></span><a class="reference internal" href="../variable/CMAKE_LANG_FLAGS.html#variable:CMAKE_<LANG>_FLAGS" title="CMAKE_<LANG>_FLAGS"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_CXX_FLAGS</span></code></a> variable with knowledge |
| of the CMake builtin default so it can be replaced.</p> |
| <p>CMake 3.20 and above prefer to leave out <code class="docutils literal notranslate"><span class="pre">/GR</span></code> from the value of |
| <span class="target" id="index-3-variable:CMAKE_<LANG>_FLAGS"></span><a class="reference internal" href="../variable/CMAKE_LANG_FLAGS.html#variable:CMAKE_<LANG>_FLAGS" title="CMAKE_<LANG>_FLAGS"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_CXX_FLAGS</span></code></a> by default.</p> |
| <p>This policy provides compatibility with projects that have not been updated |
| to expect the lack of the <code class="docutils literal notranslate"><span class="pre">/GR</span></code> flag. The policy setting takes effect as |
| of the first <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 notranslate"><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 notranslate"><span class="pre">enable_language()</span></code></a> command that |
| initializes <span class="target" id="index-4-variable:CMAKE_<LANG>_FLAGS"></span><a class="reference internal" href="../variable/CMAKE_LANG_FLAGS.html#variable:CMAKE_<LANG>_FLAGS" title="CMAKE_<LANG>_FLAGS"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_CXX_FLAGS</span></code></a>.</p> |
| <div class="admonition note"> |
| <p class="admonition-title">Note</p> |
| <p>Once the policy has taken effect at the top of a project for a given |
| language, that choice must be used throughout the tree for that language. |
| In projects that have nested projects in subdirectories, be sure to |
| convert everything together.</p> |
| </div> |
| <p>The <code class="docutils literal notranslate"><span class="pre">OLD</span></code> behavior for this policy is to place the MSVC <code class="docutils literal notranslate"><span class="pre">/GR</span></code> flag in the |
| default <span class="target" id="index-5-variable:CMAKE_<LANG>_FLAGS"></span><a class="reference internal" href="../variable/CMAKE_LANG_FLAGS.html#variable:CMAKE_<LANG>_FLAGS" title="CMAKE_<LANG>_FLAGS"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_CXX_FLAGS</span></code></a> cache entry. The |
| <code class="docutils literal notranslate"><span class="pre">NEW</span></code> behavior for this policy is to <em>not</em> place the MSVC <code class="docutils literal notranslate"><span class="pre">/GR</span></code> flag in |
| the default cache entry.</p> |
| <p>This policy was introduced in CMake version 3.20. 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 3.23.1 does <em>not</em> warn |
| when this 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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