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<span id="install-configure-compilers-and-flags-label"></span><h1><span class="section-number">5.5. </span>Specifying compilers and flags<a class="headerlink" href="#specifying-compilers-and-flags" title="Permalink to this heading"></a></h1>
<p>Changing the compilers that PMIx uses to build itself uses the
standard GNU Autoconf mechanism of setting special environment variables
either before invoking <code class="docutils literal notranslate"><span class="pre">configure</span></code> or on the <code class="docutils literal notranslate"><span class="pre">configure</span></code> command
line itself.</p>
<p>The following environment variables are recognized by <code class="docutils literal notranslate"><span class="pre">configure</span></code>:</p>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">CC</span></code>: C compiler to use</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">CFLAGS</span></code>: Compile flags to pass to the C compiler</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">CPPFLAGS</span></code>: Preprocessor flags to pass to the C compiler</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">LDFLAGS</span></code>: Linker flags to pass to all compilers</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">LIBS</span></code>: Libraries to pass to all compilers (it is rarely
necessary for users to need to specify additional <code class="docutils literal notranslate"><span class="pre">LIBS</span></code>)</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">PKG_CONFIG</span></code>: Path to the <code class="docutils literal notranslate"><span class="pre">pkg-config</span></code> utility</p></li>
</ul>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>PMIx v5.0.8a1 does not contain any C++ code. However,
you can use a C++ compiler to build PMIx if you so choose.</p>
</div>
<p>For example, to build with a specific instance of <code class="docutils literal notranslate"><span class="pre">gcc</span></code>:</p>
<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span>shell$<span class="w"> </span>./configure<span class="w"> </span><span class="se">\</span>
<span class="w"> </span><span class="nv">CC</span><span class="o">=</span>/opt/gcc-a.b.c/bin/gcc<span class="w"> </span><span class="nv">CFLAGS</span><span class="o">=</span>-m64<span class="w"> </span>...
</pre></div>
</div>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>The PMIx community generally suggests using the above
command line form for setting different compilers (vs. setting
environment variables and then invoking <code class="docutils literal notranslate"><span class="pre">./configure</span></code>). The
above form will save all variables and values in the <code class="docutils literal notranslate"><span class="pre">config.log</span></code>
file, which makes post-mortem analysis easier if problems occur.</p>
</div>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p>Note that setting <code class="docutils literal notranslate"><span class="pre">CFLAGS</span></code> (etc.) does <em>not</em> affect the
flags used by the <a class="reference internal" href="../building-apps/quickstart.html#label-quickstart-building-apps"><span class="std std-ref">wrapper compiler</span></a>. In the above, example, you may
also need to add <code class="docutils literal notranslate"><span class="pre">-m64</span></code> to the <code class="docutils literal notranslate"><span class="pre">--with-wrapper-cflags</span></code>
option:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>shell$ ./configure CFLAGS=-m64 \
--with-wrapper-cflags=-m64 ...
</pre></div>
</div>
<p>Failure to do this will result in PMIx-based applications
failing to compile / link properly.</p>
<p>See the <a class="reference internal" href="../building-apps/customizing-wrappers.html#label-customizing-wrapper-compiler"><span class="std std-ref">Customizing wrapper compiler behavior</span></a> section for more
details.</p>
</div>
<p>Note that if you intend to compile PMIx with a <code class="docutils literal notranslate"><span class="pre">make</span></code> other than
the default one in your <code class="docutils literal notranslate"><span class="pre">PATH</span></code>, then you must either set the <code class="docutils literal notranslate"><span class="pre">$MAKE</span></code>
environment variable before invoking PMIx’s <code class="docutils literal notranslate"><span class="pre">configure</span></code> script, or
pass <code class="docutils literal notranslate"><span class="pre">MAKE=your_make_prog</span></code> to configure. For example:</p>
<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span>shell$<span class="w"> </span>./configure<span class="w"> </span><span class="nv">MAKE</span><span class="o">=</span>/path/to/my/make<span class="w"> </span>...
</pre></div>
</div>
<p>This could be the case, for instance, if you have a shell alias for
<code class="docutils literal notranslate"><span class="pre">make</span></code>, or you always type <code class="docutils literal notranslate"><span class="pre">gmake</span></code> out of habit. Failure to tell
<code class="docutils literal notranslate"><span class="pre">configure</span></code> which non-default <code class="docutils literal notranslate"><span class="pre">make</span></code> you will use to compile PMIx
can result in undefined behavior (meaning: don’t do that).</p>
<p>Note that you may also want to ensure that the value of
<code class="docutils literal notranslate"><span class="pre">LD_LIBRARY_PATH</span></code> is set appropriately (or not at all) for your build
(or whatever environment variable is relevant for your operating
system). For example, some users have been tripped up by setting to
use a non-default C compiler via the <code class="docutils literal notranslate"><span class="pre">CC</span></code> environment variable,
but then failing to set <code class="docutils literal notranslate"><span class="pre">LD_LIBRARY_PATH</span></code> to include the directory
containing that non-default C compiler’s support libraries.
This causes PMIx’s <code class="docutils literal notranslate"><span class="pre">configure</span></code> script to fail when it tries to
compile / link / run simple C programs.</p>
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