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<h1><span class="section-number">13.3. </span>Compiler Pickyness by Default<a class="headerlink" href="#compiler-pickyness-by-default" title="Permalink to this heading"></a></h1>
<p>If you are building Open MPI from a Git clone (i.e., there is a
<code class="docutils literal notranslate"><span class="pre">.git</span></code> directory in your build tree), the default build includes
extra compiler pickyness, which will result in more compiler warnings
than in non-developer builds. Getting these extra compiler warnings
is helpful to Open MPI developers in making the code base as clean as
possible.</p>
<p>Developers can disable this picky-by-default behavior by using the
<code class="docutils literal notranslate"><span class="pre">--disable-picky</span></code> configure option. Also note that extra-picky
compiles do <em>not</em> happen automatically when you do a VPATH build
(e.g., if <code class="docutils literal notranslate"><span class="pre">.git</span></code> is in your source tree, but not in your build
tree).</p>
<p>Prior versions of Open MPI would automatically activate a lot of
(performance-reducing) debugging code by default if <code class="docutils literal notranslate"><span class="pre">.git</span></code> was found
in your build tree. This is no longer true. You can manually enable
these (performance-reducing) debugging features in the Open MPI code
base with these configure options:</p>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">--enable-debug</span></code></p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">--enable-mem-debug</span></code></p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">--enable-mem-profile</span></code></p></li>
</ul>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>These options are really only relevant to those who are
developing Open MPI itself. They are not generally helpful for
debugging general MPI applications.</p>
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