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  <div class="section" id="frequently-asked-questions-faq">
<h1>Frequently Asked Questions (FAQ)<a class="headerlink" href="#frequently-asked-questions-faq" title="Permalink to this headline"></a></h1>
<div class="contents local topic" id="contents">
<ul class="simple">
<li><a class="reference internal" href="#driver" id="id1">Driver</a><ul>
<li><a class="reference internal" href="#i-run-clang-cc1-and-get-weird-errors-about-missing-headers" id="id2">I run <code class="docutils literal"><span class="pre">clang</span> <span class="pre">-cc1</span> <span class="pre">...</span></code> and get weird errors about missing headers</a></li>
<li><a class="reference internal" href="#i-get-errors-about-some-headers-being-missing-stddef-h-stdarg-h" id="id3">I get errors about some headers being missing (<code class="docutils literal"><span class="pre">stddef.h</span></code>, <code class="docutils literal"><span class="pre">stdarg.h</span></code>)</a></li>
</ul>
</li>
</ul>
</div>
<div class="section" id="driver">
<h2><a class="toc-backref" href="#id1">Driver</a><a class="headerlink" href="#driver" title="Permalink to this headline"></a></h2>
<div class="section" id="i-run-clang-cc1-and-get-weird-errors-about-missing-headers">
<h3><a class="toc-backref" href="#id2">I run <code class="docutils literal"><span class="pre">clang</span> <span class="pre">-cc1</span> <span class="pre">...</span></code> and get weird errors about missing headers</a><a class="headerlink" href="#i-run-clang-cc1-and-get-weird-errors-about-missing-headers" title="Permalink to this headline"></a></h3>
<p>Given this source file:</p>
<div class="highlight-c"><div class="highlight"><pre><span></span><span class="cp">#include</span> <span class="cpf">&lt;stdio.h&gt;</span><span class="cp"></span>

<span class="kt">int</span> <span class="nf">main</span><span class="p">()</span> <span class="p">{</span>
  <span class="n">printf</span><span class="p">(</span><span class="s">&quot;Hello world</span><span class="se">\n</span><span class="s">&quot;</span><span class="p">);</span>
<span class="p">}</span>
</pre></div>
</div>
<p>If you run:</p>
<div class="highlight-console"><div class="highlight"><pre><span></span><span class="gp">$</span> clang -cc1 hello.c
<span class="go">hello.c:1:10: fatal error: &#39;stdio.h&#39; file not found</span>
<span class="gp">#</span>include &lt;stdio.h&gt;
<span class="go">         ^</span>
<span class="go">1 error generated.</span>
</pre></div>
</div>
<p><code class="docutils literal"><span class="pre">clang</span> <span class="pre">-cc1</span></code> is the frontend, <code class="docutils literal"><span class="pre">clang</span></code> is the <a class="reference internal" href="DriverInternals.html"><span class="doc">driver</span></a>.  The driver invokes the frontend with options appropriate
for your system.  To see these options, run:</p>
<div class="highlight-console"><div class="highlight"><pre><span></span><span class="gp">$</span> clang -### -c hello.c
</pre></div>
</div>
<p>Some clang command line options are driver-only options, some are frontend-only
options.  Frontend-only options are intended to be used only by clang developers.
Users should not run <code class="docutils literal"><span class="pre">clang</span> <span class="pre">-cc1</span></code> directly, because <code class="docutils literal"><span class="pre">-cc1</span></code> options are not
guaranteed to be stable.</p>
<p>If you want to use a frontend-only option (&#8220;a <code class="docutils literal"><span class="pre">-cc1</span></code> option&#8221;), for example
<code class="docutils literal"><span class="pre">-ast-dump</span></code>, then you need to take the <code class="docutils literal"><span class="pre">clang</span> <span class="pre">-cc1</span></code> line generated by the
driver and add the option you need.  Alternatively, you can run
<code class="docutils literal"><span class="pre">clang</span> <span class="pre">-Xclang</span> <span class="pre">&lt;option&gt;</span> <span class="pre">...</span></code> to force the driver pass <code class="docutils literal"><span class="pre">&lt;option&gt;</span></code> to
<code class="docutils literal"><span class="pre">clang</span> <span class="pre">-cc1</span></code>.</p>
</div>
<div class="section" id="i-get-errors-about-some-headers-being-missing-stddef-h-stdarg-h">
<h3><a class="toc-backref" href="#id3">I get errors about some headers being missing (<code class="docutils literal"><span class="pre">stddef.h</span></code>, <code class="docutils literal"><span class="pre">stdarg.h</span></code>)</a><a class="headerlink" href="#i-get-errors-about-some-headers-being-missing-stddef-h-stdarg-h" title="Permalink to this headline"></a></h3>
<p>Some header files (<code class="docutils literal"><span class="pre">stddef.h</span></code>, <code class="docutils literal"><span class="pre">stdarg.h</span></code>, and others) are shipped with
Clang &#8212; these are called builtin includes.  Clang searches for them in a
directory relative to the location of the <code class="docutils literal"><span class="pre">clang</span></code> binary.  If you moved the
<code class="docutils literal"><span class="pre">clang</span></code> binary, you need to move the builtin headers, too.</p>
<p>More information can be found in the <a class="reference internal" href="LibTooling.html#libtooling-builtin-includes"><span class="std std-ref">Builtin includes</span></a>
section.</p>
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