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<li class="toctree-l1"><a class="reference internal" href="../quickstart.html">1. Quick start</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../getting-help.html">2. Getting help</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../release-notes/index.html">3. Release notes</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../installing-open-mpi/index.html">4. Building and installing Open MPI</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../features/index.html">5. Open MPI-specific features</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../validate.html">6. Validating your installation</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../version-numbering.html">7. Version numbers and compatibility</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../mca.html">8. The Modular Component Architecture (MCA)</a></li>
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<li class="toctree-l1 current"><a class="reference internal" href="index.html">9. Building MPI applications</a><ul class="current">
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<li class="toctree-l2 current"><a class="current reference internal" href="#">9.1. Quick start: Building MPI applications</a></li>
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<li class="toctree-l2"><a class="reference internal" href="customizing-wrappers.html">9.2. Customizing wrapper compiler behavior</a></li>
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<li class="toctree-l2"><a class="reference internal" href="extracting-wrapper-flags.html">9.3. Extracting flags from the wrapper compilers</a></li>
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<li class="toctree-l2"><a class="reference internal" href="abi-compatibility.html">9.4. ABI compatibility to previous versions of Open MPI</a></li>
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<li class="toctree-l2"><a class="reference internal" href="removed-mpi-constructs.html">9.5. Removed MPI constructs</a></li>
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<li class="toctree-l2"><a class="reference internal" href="deprecation-warnings.html">9.6. Deprecation warnings while compiling MPI applications</a></li>
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<li class="toctree-l2"><a class="reference internal" href="building-static-apps.html">9.7. Building fully-static MPI applications</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../launching-apps/index.html">10. Launching MPI applications</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../tuning-apps/index.html">11. Run-time operation and tuning MPI applications</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../app-debug/index.html">12. Debugging Open MPI Parallel Applications</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../developers/index.html">13. Developer’s guide</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../contributing.html">14. Contributing to Open MPI</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../history.html">16. History of Open MPI</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../man-openmpi/index.html">17. Open MPI manual pages</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../man-openshmem/index.html">18. OpenSHMEM manual pages</a></li>
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<li class="breadcrumb-item"><a href="index.html"><span class="section-number">9. </span>Building MPI applications</a></li>
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<span id="label-quickstart-building-apps"></span><h1><span class="section-number">9.1. </span>Quick start: Building MPI applications<a class="headerlink" href="#quick-start-building-mpi-applications" title="Permalink to this heading"></a></h1>
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<p>Although this section skips many details, it offers examples that will
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probably work in many environments.</p>
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<div class="admonition caution">
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<p class="admonition-title">Caution</p>
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<p>Note that this section is a “Quick start” — it does
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not attempt to be comprehensive or describe how to build Open MPI
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in all supported environments. The examples below may therefore
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not work exactly as shown in your environment.</p>
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<p>Please consult the other sections in this chapter for more details,
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if necessary.</p>
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</div>
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<p>Open MPI provides “wrapper” compilers that should be used for
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compiling MPI and OpenSHMEM applications:</p>
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<table class="docutils align-default">
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<colgroup>
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<col style="width: 20%" />
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<col style="width: 80%" />
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</colgroup>
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<tbody>
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<tr class="row-odd"><td><p>C</p></td>
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<td><p><a class="reference internal" href="../man-openmpi/man1/ompi-wrapper-compiler.1.html#man1-mpicc"><span class="std std-ref">mpicc(1)</span></a>,
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<a class="reference internal" href="../man-openshmem/man1/oshmem-wrapper-compiler.1.html#man1-oshcc"><span class="std std-ref">oshcc(1)</span></a></p></td>
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</tr>
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<tr class="row-even"><td><p>C++</p></td>
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<td><p><a class="reference internal" href="../man-openmpi/man1/ompi-wrapper-compiler.1.html#man1-mpic"><span class="std std-ref">mpic++(1)</span></a>,
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<a class="reference internal" href="../man-openshmem/man1/oshmem-wrapper-compiler.1.html#man1-oshc"><span class="std std-ref">oshc++(1)</span></a>
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(and <a class="reference internal" href="../man-openmpi/man1/ompi-wrapper-compiler.1.html#man1-mpicc"><span class="std std-ref">mpiCC(1)</span></a>
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and <a class="reference internal" href="../man-openshmem/man1/oshmem-wrapper-compiler.1.html#man1-oshcc"><span class="std std-ref">oshCC(1)</span></a>
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if you filesystem is
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case-sensitive)</p></td>
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</tr>
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<tr class="row-odd"><td><p>Fortran</p></td>
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<td><p><a class="reference internal" href="../man-openmpi/man1/ompi-wrapper-compiler.1.html#man1-mpifort"><span class="std std-ref">mpifort(1)</span></a>,
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<a class="reference internal" href="../man-openshmem/man1/oshmem-wrapper-compiler.1.html#man1-oshfort"><span class="std std-ref">oshfort(1)</span></a></p></td>
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</tr>
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</tbody>
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</table>
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<div class="admonition caution">
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<p class="admonition-title">Caution</p>
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<p>The legacy names <code class="docutils literal notranslate"><span class="pre">mpif77</span></code> and <code class="docutils literal notranslate"><span class="pre">mpif90</span></code> still exist,
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and are simply symbolic links to the <code class="docutils literal notranslate"><span class="pre">mpifort</span></code> wrapper
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compiler. Users are strongly encouraged to update all
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build scripts to use <code class="docutils literal notranslate"><span class="pre">mpifort</span></code> instead of <code class="docutils literal notranslate"><span class="pre">mpif77</span></code>
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and <code class="docutils literal notranslate"><span class="pre">mpif90</span></code>.</p>
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</div>
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<p>The intent is that users can simply invoke the Open MPI wrapper
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compiler instead of their usual language compiler. For example,
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instead of invoking your usual C compiler to build your MPI C
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appliance, use <code class="docutils literal notranslate"><span class="pre">mpicc</span></code>:</p>
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<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span>shell$<span class="w"> </span>mpicc<span class="w"> </span>hello_world_mpi.c<span class="w"> </span>-o<span class="w"> </span>hello_world_mpi<span class="w"> </span>-g
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shell$
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</pre></div>
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</div>
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<p>For OpenSHMEM applications:</p>
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<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span>shell$<span class="w"> </span>oshcc<span class="w"> </span>hello_shmem.c<span class="w"> </span>-o<span class="w"> </span>hello_shmem<span class="w"> </span>-g
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shell$
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</pre></div>
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</div>
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<p>All the wrapper compilers do is add a variety of compiler and linker
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flags to the command line and then invoke a back-end compiler. To be
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specific: the wrapper compilers do not parse source code at all; they
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are solely command-line manipulators, and have nothing to do with the
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actual compilation or linking of programs. The end result is an MPI
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executable that is properly linked to all the relevant libraries.</p>
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<div class="admonition caution">
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<p class="admonition-title">Caution</p>
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<p>It is <em>absolutely not sufficient</em> to simply add <code class="docutils literal notranslate"><span class="pre">-lmpi</span></code>
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to your link line and assume that you will obtain a valid
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Open MPI executable.</p>
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</div>
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