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| <div class="section" id="cmp0056"> |
| <span id="policy:CMP0056"></span><h1>CMP0056<a class="headerlink" href="#cmp0056" title="Permalink to this headline">ΒΆ</a></h1> |
| <div class="versionadded"> |
| <p><span class="versionmodified added">New in version 3.2.</span></p> |
| </div> |
| <p>Honor link flags in <span class="target" id="index-0-command:try_compile"></span><a class="reference internal" href="../command/try_compile.html#command:try_compile" title="try_compile"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">try_compile()</span></code></a> source-file signature.</p> |
| <p>The <span class="target" id="index-1-command:try_compile"></span><a class="reference internal" href="../command/try_compile.html#command:try_compile" title="try_compile"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">try_compile()</span></code></a> command source-file signature generates a |
| <code class="docutils literal notranslate"><span class="pre">CMakeLists.txt</span></code> file to build the source file into an executable. |
| In order to compile the source the same way as it might be compiled |
| by the calling project, the generated project sets the value of the |
| <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_<LANG>_FLAGS</span></code></a> variable to that in the calling project. |
| The value of the <span class="target" id="index-0-variable:CMAKE_EXE_LINKER_FLAGS"></span><a class="reference internal" href="../variable/CMAKE_EXE_LINKER_FLAGS.html#variable:CMAKE_EXE_LINKER_FLAGS" title="CMAKE_EXE_LINKER_FLAGS"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_EXE_LINKER_FLAGS</span></code></a> variable may be |
| needed in some cases too, but CMake 3.1 and lower did not set it in |
| the generated project. CMake 3.2 and above prefer to set it so that |
| linker flags are honored as well as compiler flags. This policy |
| provides compatibility with the pre-3.2 behavior.</p> |
| <p>The <code class="docutils literal notranslate"><span class="pre">OLD</span></code> behavior for this policy is to not set the value of the |
| <span class="target" id="index-1-variable:CMAKE_EXE_LINKER_FLAGS"></span><a class="reference internal" href="../variable/CMAKE_EXE_LINKER_FLAGS.html#variable:CMAKE_EXE_LINKER_FLAGS" title="CMAKE_EXE_LINKER_FLAGS"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_EXE_LINKER_FLAGS</span></code></a> variable in the generated test |
| project. The <code class="docutils literal notranslate"><span class="pre">NEW</span></code> behavior for this policy is to set the value of |
| the <span class="target" id="index-2-variable:CMAKE_EXE_LINKER_FLAGS"></span><a class="reference internal" href="../variable/CMAKE_EXE_LINKER_FLAGS.html#variable:CMAKE_EXE_LINKER_FLAGS" title="CMAKE_EXE_LINKER_FLAGS"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_EXE_LINKER_FLAGS</span></code></a> variable in the test project |
| to the same as it is in the calling project.</p> |
| <p>If the project code does not set the policy explicitly, users may |
| set it on the command line by defining the |
| <span class="target" id="index-0-variable:CMAKE_POLICY_DEFAULT_CMP<NNNN>"></span><a class="reference internal" href="../variable/CMAKE_POLICY_DEFAULT_CMPNNNN.html#variable:CMAKE_POLICY_DEFAULT_CMP<NNNN>" title="CMAKE_POLICY_DEFAULT_CMP<NNNN>"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_POLICY_DEFAULT_CMP0056</span></code></a> |
| variable in the cache.</p> |
| <p>This policy was introduced in CMake version 3.2. Unlike most policies, |
| CMake version 3.23.1 does <em>not</em> warn by default when this policy |
| is not set and simply uses <code class="docutils literal notranslate"><span class="pre">OLD</span></code> 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 notranslate"><span class="pre">CMAKE_POLICY_WARNING_CMP0056</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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