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<div class="section" id="cmake-ninja-output-path-prefix">
<span id="variable:CMAKE_NINJA_OUTPUT_PATH_PREFIX"></span><h1>CMAKE_NINJA_OUTPUT_PATH_PREFIX<a class="headerlink" href="#cmake-ninja-output-path-prefix" title="Permalink to this headline">ΒΆ</a></h1>
<p>Set output files path prefix for the <span class="target" id="index-0-generator:Ninja"></span><a class="reference internal" href="../generator/Ninja.html#generator:Ninja" title="Ninja"><code class="xref cmake cmake-generator docutils literal"><span class="pre">Ninja</span></code></a> generator.</p>
<p>Every output files listed in the generated <code class="docutils literal"><span class="pre">build.ninja</span></code> will be
prefixed by the contents of this variable (a trailing slash is
appended if missing). This is useful when the generated ninja file is
meant to be embedded as a <code class="docutils literal"><span class="pre">subninja</span></code> file into a <em>super</em> ninja
project. For example, a ninja build file generated with a command
like:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">cd</span> <span class="n">top</span><span class="o">-</span><span class="n">build</span><span class="o">-</span><span class="nb">dir</span><span class="o">/</span><span class="n">sub</span> <span class="o">&amp;&amp;</span>
<span class="n">cmake</span> <span class="o">-</span><span class="n">G</span> <span class="n">Ninja</span> <span class="o">-</span><span class="n">DCMAKE_NINJA_OUTPUT_PATH_PREFIX</span><span class="o">=</span><span class="n">sub</span><span class="o">/</span> <span class="n">path</span><span class="o">/</span><span class="n">to</span><span class="o">/</span><span class="n">source</span>
</pre></div>
</div>
<p>can be embedded in <code class="docutils literal"><span class="pre">top-build-dir/build.ninja</span></code> with a directive like
this:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">subninja</span> <span class="n">sub</span><span class="o">/</span><span class="n">build</span><span class="o">.</span><span class="n">ninja</span>
</pre></div>
</div>
<p>The <code class="docutils literal"><span class="pre">auto-regeneration</span></code> rule in <code class="docutils literal"><span class="pre">top-build-dir/build.ninja</span></code> must have an
order-only dependency on <code class="docutils literal"><span class="pre">sub/build.ninja</span></code>.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">When <code class="docutils literal"><span class="pre">CMAKE_NINJA_OUTPUT_PATH_PREFIX</span></code> is set, the project generated
by CMake cannot be used as a standalone project. No default targets
are specified.</p>
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