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<span id="label-binary-compatibility"></span><h1><span class="section-number">9.4. </span>ABI compatibility to previous versions of Open MPI<a class="headerlink" href="#abi-compatibility-to-previous-versions-of-open-mpi" title="Permalink to this heading"></a></h1>
<p>The Open MPI v5.0.x series maintains Application Binary Interface (ABI)
compatibility for the C MPI bindings to the last major Open MPI release. Specifically, an
application compiled with Open MPI v4.x can be executed with Open MPI
v5.0.x without having to recompile the application.</p>
<div class="admonition important">
<p class="admonition-title">Important</p>
<p>ABI is maintained for <em>most</em> of the Fortran MPI bindings, too — see below for additional information.</p>
</div>
<p>There are however a few scenarios where an application compiled with
Open MPI v4.x might not execute correctly with Open MPI 5.0.</p>
<ul>
<li><p>Fortran compilers provide varying degrees of ABI guarantees between
their releases. As such, Open MPI can only provide ABI guarantees
with MPI applications that use the Fortran MPI bindings when all
three entities — Open MPI v4.x, Open MPI v5.0.x, and
the MPI application — were built with exactly the same Fortran
compiler and environment.</p>
<p>If these conditions are met, Open MPI’s ABI guarantees between the
Open MPI v4.x and v5.0.x series are in effect, with the
exception of the following cases:</p>
<ul>
<li><p>When using the Fortran <code class="docutils literal notranslate"><span class="pre">mpi</span></code> module bindings with GCC compiler
versions prior to v4.8, non-compliant Fortran interfaces for
<code class="docutils literal notranslate"><span class="pre">MPI_Comm_spawn_multiple</span></code>, <code class="docutils literal notranslate"><span class="pre">MPI_Testall</span></code>, <code class="docutils literal notranslate"><span class="pre">MPI_Testsome</span></code>,
<code class="docutils literal notranslate"><span class="pre">MPI_Waitall</span></code>, and <code class="docutils literal notranslate"><span class="pre">MPI_Waitsome</span></code> were removed starting with
Open MPI v5.0.0.</p></li>
<li><p>When using the Fortran <code class="docutils literal notranslate"><span class="pre">mpi</span></code> module with modern Fortran
compilers (e.g., GNU Fortran >= v4.9), Open MPI v5.0.0 removed the
names from the MPI interfaces when there is only a single
subroutine in the interface, and that subroutine name exactly
matches the iterface name. This change is likely to make Open MPI
v5.0.x’s <code class="docutils literal notranslate"><span class="pre">mpi</span></code> module bindings <em>less</em> restrictive than
Open MPI v4.x, but it <em>may</em> also have ABI implications, depending
on your Fortran compiler.</p>
<p><a class="reference external" href="https://github.com/open-mpi/ompi/commit/f34782fe0c493963ec44bcf7dde9d94b88a7ea91">See this git commit message</a>
for more details.</p>
<div class="admonition important">
<p class="admonition-title">Important</p>
<p>This is likely a compiler-specific issue, and may
need to be tested in your environment.</p>
</div>
</li>
<li><p>When using the Fortran <code class="docutils literal notranslate"><span class="pre">mpi_f08</span></code> module bindings in an
environment where a Fortran <code class="docutils literal notranslate"><span class="pre">INTEGER</span></code> is 8 bytes but a C <code class="docutils literal notranslate"><span class="pre">int</span></code>
is 4 bytes, the size of a <code class="docutils literal notranslate"><span class="pre">Type(MPI_Status)</span></code> was increased
starting with Open MPI v5.0.0.</p></li>
</ul>
</li>
<li><p>Open MPI v5.0.0 removed support for the MPI C++ bindings. If an application
was using the deprecated and now removed C++ bindings, it will not
be able to compile or execute with Open MPI v5.0.0. For details on deprecated and
removed functions see <a class="reference internal" href="removed-mpi-constructs.html#label-removed-mpi-constructs"><span class="std std-ref">Removed MPI constructs</span></a> and <a class="reference internal" href="deprecation-warnings.html#label-deprecated-functions"><span class="std std-ref">Deprecation warnings</span></a></p></li>
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