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<span id="compiler-notes-section-label"></span><h1><span class="section-number">3.3. </span>Compiler Notes<a class="headerlink" href="#compiler-notes" title="Permalink to this heading"></a></h1>
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<ul>
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<li><p>PMIx requires a C99-capable compiler to build.</p></li>
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<li><p>PMIx requires a compiler that either supports C11 atomics or the GCC
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<code class="docutils literal notranslate"><span class="pre">__atomic</span></code> atomics (e.g., GCC >= v4.8.x).</p></li>
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<li><p>32-bit platforms are not currently supported.</p></li>
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<li><p>In general, the latest versions of compilers of a given vendor’s
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series have the least bugs. We have seen cases where Vendor XYZ’s
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compiler version A.B fails to compile PMIx, but version A.C
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(where C>B) works just fine. If you run into a compile failure, you
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might want to double check that you have the latest bug fixes and
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patches for your compiler.</p></li>
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<li><p>PMIx does not support the PGI compiler suite on OS X or MacOS.
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See issues below for more details:</p>
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<ul class="simple">
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<li><p><a class="reference external" href="https://github.com/open-mpi/ompi/issues/2604">https://github.com/open-mpi/ompi/issues/2604</a></p></li>
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<li><p><a class="reference external" href="https://github.com/open-mpi/ompi/issues/2605">https://github.com/open-mpi/ompi/issues/2605</a></p></li>
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</ul>
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</li>
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<li><p>At least some versions of the Intel 8.1 compiler seg fault while
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compiling certain PMIx source code files. As such, it is not
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supported.</p></li>
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<li><p>It has been reported that the Intel 9.1 and 10.0 compilers fail to
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compile PMIx on IA64 platforms. As of 12 Sep 2012, there is
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very little (if any) testing performed on IA64 platforms (with any
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compiler). Support is “best effort” for these platforms, but it is
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doubtful that any effort will be expended to fix the Intel 9.1 /
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10.0 compiler issuers on this platform.</p></li>
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<li><p>Early versions of the Intel 12.1 Linux compiler suite on x86_64 seem
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to have a bug that prevents PMIx from working. Symptoms
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including immediate segv of the wrapper compiler (<code class="docutils literal notranslate"><span class="pre">pmixcc</span></code>) and
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PMIx-based applications. If you upgrade to the latest
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version of the Intel 12.1 Linux compiler suite, the problem will go
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away.</p></li>
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<li><p>The Portland Group compilers prior to version 7.0 require the
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<code class="docutils literal notranslate"><span class="pre">-Msignextend</span></code> compiler flag to extend the sign bit when converting
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from a shorter to longer integer. This is different than other
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compilers (such as GNU). When compiling PMIx with the Portland
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compiler suite, the following flags should be passed to PMIx’s
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<code class="docutils literal notranslate"><span class="pre">configure</span></code> script:</p>
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<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span>shell$<span class="w"> </span>./configure<span class="w"> </span><span class="nv">CFLAGS</span><span class="o">=</span>-Msignextend<span class="w"> </span><span class="se">\</span>
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<span class="w"> </span>--with-wrapper-cflags<span class="o">=</span>-Msignextend<span class="w"> </span>...
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</pre></div>
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</div>
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<p>This will both compile PMIx with the proper compile flags and
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also automatically add <code class="docutils literal notranslate"><span class="pre">-Msignextend</span></code> when the C wrapper
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compiler is used to compile user PMIx-based applications.</p>
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</li>
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<li><p>It has been reported that Pathscale 5.0.5 and 6.0.527 compilers
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give an internal compiler error when trying to build PMIx.</p></li>
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<li><p>As of July 2017, the Pathscale compiler suite apparently has no
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further commercial support, and it does not look like there will be
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further releases. Any issues discovered regarding building /
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running PMIx with the Pathscale compiler suite therefore may not
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be able to be resolved.</p></li>
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