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<h1><span class="section-number">7. </span>Release Notes<a class="headerlink" href="#release-notes" title="Permalink to this heading"></a></h1>
<p>The following abbreviated list of release notes applies to this code
base as of this writing (10 Mar 2023):</p>
<div class="section" id="general-notes">
<h2><span class="section-number">7.1. </span>General notes<a class="headerlink" href="#general-notes" title="Permalink to this heading"></a></h2>
<ul class="simple">
<li><p>Systems that have been tested are:</p>
<ul>
<li><p>Linux (various flavors/distros), 64 bit (x86), with gcc, Intel,
and Portland (*)</p></li>
<li><p>OS X (10.7 and above), 64 bit (x86_64), with gcc and clang (*)</p></li>
</ul>
</li>
<li><p>OpenPMIx has taken some steps towards Reproducible Builds
(<a class="reference external" href="https://reproducible-builds.org/">https://reproducible-builds.org/</a>). Specifically, OpenPMIx’s
<code class="docutils literal notranslate"><span class="pre">configure</span></code> and <code class="docutils literal notranslate"><span class="pre">make</span></code> process, by default, records the build date
and some system-specific information such as the hostname where OpenPMIx
was built and the username who built it. If you desire a
Reproducible Build, set the <code class="docutils literal notranslate"><span class="pre">$SOURCE_DATE_EPOCH</span></code>, <code class="docutils literal notranslate"><span class="pre">$USER</span></code> and <code class="docutils literal notranslate"><span class="pre">$HOSTNAME</span></code>
environment variables before invoking <code class="docutils literal notranslate"><span class="pre">configure</span></code> and <code class="docutils literal notranslate"><span class="pre">make</span></code>, and
OpenPMIx will use those values instead of invoking <code class="docutils literal notranslate"><span class="pre">whoami</span></code> and/or
<code class="docutils literal notranslate"><span class="pre">hostname</span></code>, respectively. See
<a class="reference external" href="https://reproducible-builds.org/docs/source-date-epoch/">https://reproducible-builds.org/docs/source-date-epoch/</a> for
information on the expected format and content of the
<code class="docutils literal notranslate"><span class="pre">$SOURCE_DATE_EPOCH</span></code> variable.</p></li>
</ul>
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<div class="section" id="compiler-notes">
<h2><span class="section-number">7.2. </span>Compiler Notes<a class="headerlink" href="#compiler-notes" title="Permalink to this heading"></a></h2>
<ul>
<li><p>The Portland Group compilers prior to version 7.0 require the
<code class="docutils literal notranslate"><span class="pre">-Msignextend</span></code> compiler flag to extend the sign bit when converting
from a shorter to longer integer. This is is different than other
compilers (such as GNU). When compiling PMIx with the Portland
compiler suite, the following flags should be passed to PMIx’s
configure script:</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">CFLAGS</span><span class="o">=</span>-Msignextend<span class="w"> </span>...
</pre></div>
</div>
<p>This will compile PMIx with the proper compile flags.</p>
</li>
<li><p>Running on nodes with different endian and/or different datatype
sizes within a single parallel job is supported in this release.
However, PMIx does not resize data when datatypes differ in size
(for example, sending a 4 byte double and receiving an 8 byte
double will fail).</p></li>
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