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<section id="cmake-verify-interface-header-sets">
<span id="variable:CMAKE_VERIFY_INTERFACE_HEADER_SETS"></span><h1>CMAKE_VERIFY_INTERFACE_HEADER_SETS<a class="headerlink" href="#cmake-verify-interface-header-sets" title="Permalink to this heading">ΒΆ</a></h1>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.24.</span></p>
</div>
<p>This variable is used to initialize the
<span class="target" id="index-0-prop_tgt:VERIFY_INTERFACE_HEADER_SETS"></span><a class="reference internal" href="../prop_tgt/VERIFY_INTERFACE_HEADER_SETS.html#prop_tgt:VERIFY_INTERFACE_HEADER_SETS" title="VERIFY_INTERFACE_HEADER_SETS"><code class="xref cmake cmake-prop_tgt docutils literal notranslate"><span class="pre">VERIFY_INTERFACE_HEADER_SETS</span></code></a> property of targets when they are
created. Setting it to true enables header set verification.</p>
<p>Projects should not normally set this variable, it is intended as a developer
control to be set on the <span class="target" id="index-0-manual:cmake(1)"></span><a class="reference internal" href="../manual/cmake.1.html#manual:cmake(1)" title="cmake(1)"><code class="xref cmake cmake-manual docutils literal notranslate"><span class="pre">cmake(1)</span></code></a> command line or other
equivalent methods. The developer must have the ability to enable or
disable header set verification according to the capabilities of their own
machine and compiler.</p>
<p>Verification of a dependency's header sets is not typically of interest
to developers. Therefore, <span class="target" id="index-0-command:fetchcontent_makeavailable"></span><a class="reference internal" href="../module/FetchContent.html#command:fetchcontent_makeavailable" title="fetchcontent_makeavailable"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">FetchContent_MakeAvailable()</span></code></a> explicitly
sets <code class="docutils literal notranslate"><span class="pre">CMAKE_VERIFY_INTERFACE_HEADER_SETS</span></code> to false for the duration of its
call, but restores its original value before returning. If a project brings
a dependency directly into the main build (e.g. calling
<span class="target" id="index-0-command:add_subdirectory"></span><a class="reference internal" href="../command/add_subdirectory.html#command:add_subdirectory" title="add_subdirectory"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">add_subdirectory()</span></code></a> on a vendored project from a git submodule), it
should also do likewise. For example:</p>
<div class="highlight-cmake notranslate"><div class="highlight"><pre><span></span><span class="c"># Save original setting so we can restore it later</span>
<span class="nf">set(</span><span class="nb">want_header_set_verification</span><span class="w"> </span><span class="o">${</span><span class="nt">CMAKE_VERIFY_INTERFACE_HEADER_SETS</span><span class="o">}</span><span class="nf">)</span><span class="w"></span>
<span class="c"># Include the vendored dependency with header set verification disabled</span>
<span class="nf">set(</span><span class="no">CMAKE_VERIFY_INTERFACE_HEADER_SETS</span><span class="w"> </span><span class="no">OFF</span><span class="nf">)</span><span class="w"></span>
<span class="nf">add_subdirectory(</span><span class="p">...</span><span class="nf">)</span><span class="w"> </span><span class="c"># Vendored sources, e.g. from git submodules</span>
<span class="c"># Add the project's own sources. Restore the developer's original choice</span>
<span class="c"># for whether to enable header set verification.</span>
<span class="nf">set(</span><span class="no">CMAKE_VERIFY_INTERFACE_HEADER_SETS</span><span class="w"> </span><span class="o">${</span><span class="nt">want_header_set_verification</span><span class="o">}</span><span class="nf">)</span><span class="w"></span>
<span class="nf">add_subdirectory(</span><span class="nb">src</span><span class="nf">)</span><span class="w"></span>
</pre></div>
</div>
<p>By default, this variable is not set, which will result in header set
verification being disabled.</p>
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