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</style><div class="section" id="openshmem-wrapper-compilers">
<span id="man1-shmemfort"></span><span id="man1-shmemc"></span><span id="man1-shmemcxx"></span><span id="man1-shmemcc"></span><span id="man1-oshfort"></span><span id="man1-oshc"></span><span id="man1-oshcxx"></span><span id="man1-oshcc"></span><h1><span class="section-number">18.1.1. </span>OpenSHMEM Wrapper Compilers<a class="headerlink" href="#openshmem-wrapper-compilers" title="Permalink to this heading"></a></h1>
<p>oshcc, oshcxx, oshc++, oshfort, shmemcc, shmemcxx, shmemc++, shmemfort — OpenSHMEM wrapper compilers</p>
<div class="section" id="syntax">
<h2><span class="section-number">18.1.1.1. </span>SYNTAX<a class="headerlink" href="#syntax" title="Permalink to this heading"></a></h2>
<p><code class="docutils literal notranslate"><span class="pre">oshcc</span> <span class="pre">[--showme</span> <span class="pre">|</span> <span class="pre">--showme:compile</span> <span class="pre">|</span> <span class="pre">--showme:link]</span> <span class="pre">...</span></code></p>
<p><code class="docutils literal notranslate"><span class="pre">oshcxx</span> <span class="pre">[--showme</span> <span class="pre">|</span> <span class="pre">--showme:compile</span> <span class="pre">|</span> <span class="pre">--showme:link]</span> <span class="pre">...</span></code></p>
<p><code class="docutils literal notranslate"><span class="pre">oshc++</span> <span class="pre">[--showme</span> <span class="pre">|</span> <span class="pre">--showme:compile</span> <span class="pre">|</span> <span class="pre">--showme:link]</span> <span class="pre">...</span></code></p>
<p><code class="docutils literal notranslate"><span class="pre">oshfort</span> <span class="pre">[--showme</span> <span class="pre">|</span> <span class="pre">--showme:compile</span> <span class="pre">|</span> <span class="pre">--showme:link]</span> <span class="pre">...</span></code></p>
<p><code class="docutils literal notranslate"><span class="pre">shmemcc</span> <span class="pre">[--showme</span> <span class="pre">|</span> <span class="pre">--showme:compile</span> <span class="pre">|</span> <span class="pre">--showme:link]</span> <span class="pre">...</span></code></p>
<p><code class="docutils literal notranslate"><span class="pre">shmemcxx</span> <span class="pre">[--showme</span> <span class="pre">|</span> <span class="pre">--showme:compile</span> <span class="pre">|</span> <span class="pre">--showme:link]</span> <span class="pre">...</span></code></p>
<p><code class="docutils literal notranslate"><span class="pre">shmemc++</span> <span class="pre">[--showme</span> <span class="pre">|</span> <span class="pre">--showme:compile</span> <span class="pre">|</span> <span class="pre">--showme:link]</span> <span class="pre">...</span></code></p>
<p><code class="docutils literal notranslate"><span class="pre">shmemfort</span> <span class="pre">[--showme</span> <span class="pre">|</span> <span class="pre">--showme:compile</span> <span class="pre">|</span> <span class="pre">--showme:link]</span> <span class="pre">...</span></code></p>
</div>
<div class="section" id="options">
<h2><span class="section-number">18.1.1.2. </span>OPTIONS<a class="headerlink" href="#options" title="Permalink to this heading"></a></h2>
<p>The options below apply to all of the wrapper compilers:</p>
<ul>
<li><p><code class="docutils literal notranslate"><span class="pre">--showme</span></code>: This option comes in several different variants (see
below). None of the variants invokes the underlying compiler; they
all provide information on how the underlying compiler would have
been invoked had <code class="docutils literal notranslate"><span class="pre">--showme</span></code> not been used. The basic <code class="docutils literal notranslate"><span class="pre">--showme</span></code>
option outputs the command line that would be executed to compile
the program.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>If a non-filename argument is passed on the command line,
the <code class="docutils literal notranslate"><span class="pre">--showme</span></code> option will <em>not</em> display any additional
flags. For example, both <code class="docutils literal notranslate"><span class="pre">"oshcc</span> <span class="pre">--showme</span></code> and
<code class="docutils literal notranslate"><span class="pre">oshcc</span> <span class="pre">--showme</span> <span class="pre">my_source.c</span></code> will show all the
wrapper-supplied flags. But <code class="docutils literal notranslate"><span class="pre">oshcc</span>
<span class="pre">--showme</span> <span class="pre">-v</span></code> will only show the underlying compiler name
and <code class="docutils literal notranslate"><span class="pre">-v</span></code>.</p>
</div>
</li>
<li><p><code class="docutils literal notranslate"><span class="pre">--showme:compile</span></code>: Output the compiler flags that would have been
supplied to the underlying compiler.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">--showme:link</span></code>: Output the linker flags that would have been
supplied to the underlying compiler.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">--showme:command</span></code>: Outputs the underlying compiler
command (which may be one or more tokens).</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">--showme:incdirs</span></code>: Outputs a space-delimited (but otherwise
undecorated) list of directories that the wrapper compiler would
have provided to the underlying compiler to indicate
where relevant header files are located.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">--showme:libdirs</span></code>: Outputs a space-delimited (but otherwise
undecorated) list of directories that the wrapper compiler would
have provided to the underlying linker to indicate where relevant
libraries are located.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">--showme:libs</span></code> Outputs a space-delimited (but otherwise
undecorated) list of library names that the wrapper compiler would
have used to link an application. For example: <code class="docutils literal notranslate"><span class="pre">mpi</span> <span class="pre">open-pal</span>
<span class="pre">util</span></code>.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">--showme:version</span></code>: Outputs the version number of Open MPI.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">--showme:help</span></code>: Output a brief usage help message.</p></li>
</ul>
<p>See the man page for your underlying compiler for other
options that can be passed through oshcc.</p>
</div>
<div class="section" id="description">
<h2><span class="section-number">18.1.1.3. </span>DESCRIPTION<a class="headerlink" href="#description" title="Permalink to this heading"></a></h2>
<p>Conceptually, the role of these commands is quite simple: transparently
add relevant compiler and linker flags to the user’s command line that
are necessary to compile / link OpenSHMEM programs, and then invoke the
underlying compiler to actually perform the command.</p>
<p>As such, these commands are frequently referred to as “wrapper”
compilers because they do not actually compile or link applications
themselves; they only add in command line flags and invoke the back-end
compiler.</p>
</div>
<div class="section" id="background">
<h2><span class="section-number">18.1.1.4. </span>Background<a class="headerlink" href="#background" title="Permalink to this heading"></a></h2>
<p>Open MPI provides wrapper compilers for several languages:</p>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">oshcc</span></code>, <code class="docutils literal notranslate"><span class="pre">shmemcc</span></code>: C</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">oshc++</span></code>, <code class="docutils literal notranslate"><span class="pre">oshcxx</span></code>, <code class="docutils literal notranslate"><span class="pre">shmemc++</span></code>, shmemcxx`:: C++</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">oshfort</span></code>, <code class="docutils literal notranslate"><span class="pre">shmemfort</span></code>: Fortran</p></li>
</ul>
<p>The wrapper compilers for each of the languages are identical; they
can be use interchangeably. The different names are provided solely
for backwards compatibility.</p>
</div>
<div class="section" id="fortran-notes">
<h2><span class="section-number">18.1.1.5. </span>Fortran Notes<a class="headerlink" href="#fortran-notes" title="Permalink to this heading"></a></h2>
<p>The Fortran wrapper compiler for OpenSHMEM (<code class="docutils literal notranslate"><span class="pre">oshfort</span></code> and
<code class="docutils literal notranslate"><span class="pre">shmemfort</span></code>) can compile and link OpenSHMEM applications that use
any/all of the OpenSHMEM Fortran bindings.</p>
<p>Note, however, that the Fortran compiler may require additional
command-line options to enforce a specific Fortran dialect. For
example, in some versions of the IBM XLF compiler, if <code class="docutils literal notranslate"><span class="pre">xlf90</span></code> is the
underlying Fortran compiler, <code class="docutils literal notranslate"><span class="pre">-qfixed</span></code> may be necessary to compile
fixed-format Fortran source files.</p>
<p>Finally, note that <code class="docutils literal notranslate"><span class="pre">oshfort</span></code> will be inoperative and will return an
error on use if Fortran support was not built into the OpenSHMEM
layer.</p>
</div>
<div class="section" id="overview">
<h2><span class="section-number">18.1.1.6. </span>Overview<a class="headerlink" href="#overview" title="Permalink to this heading"></a></h2>
<p><code class="docutils literal notranslate"><span class="pre">oshcc</span></code> and <code class="docutils literal notranslate"><span class="pre">shmemcc</span></code> are convenience wrappers for the underlying
C compiler. Translation of an OpenSHMEM program requires the linkage
of the OpenSHMEM-specific libraries which may not reside in one of the
standard search directories of <code class="docutils literal notranslate"><span class="pre">ld(1)</span></code>. It also often requires the
inclusion of header files what may also not be found in a standard
location.</p>
<p><code class="docutils literal notranslate"><span class="pre">oshcc</span></code> and <code class="docutils literal notranslate"><span class="pre">shmemcc</span></code> pass their arguments to the underlying C
compiler along with the <code class="docutils literal notranslate"><span class="pre">-I</span></code>, <code class="docutils literal notranslate"><span class="pre">-L</span></code> and <code class="docutils literal notranslate"><span class="pre">-l</span></code> options required by
OpenSHMEM programs.</p>
<p>The same is true for all the other language wrapper compilers.</p>
<p>The OpenSHMEM Team <em>strongly</em> encourages using the wrapper compilers
instead of attempting to link to the OpenSHMEM libraries manually. This
allows the specific implementation of OpenSHMEM to change without
forcing changes to linker directives in users’ Makefiles. Indeed, the
specific set of flags and libraries used by the wrapper compilers
depends on how OpenSHMEM was configured and built; the values can change
between different installations of the same version of OpenSHMEM.</p>
<p>Indeed, since the wrappers are simply thin shells on top of an
underlying compiler, there are very, very few compelling reasons <em>not</em>
to use <code class="docutils literal notranslate"><span class="pre">oshcc</span></code>. When it is not possible to use the wrappers
directly, the <code class="docutils literal notranslate"><span class="pre">--showme:compile</span></code> and <code class="docutils literal notranslate"><span class="pre">--showme:link</span></code> options should be
used to determine what flags the wrappers would have used. For example:</p>
<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span>shell$<span class="w"> </span>cc<span class="w"> </span>-c<span class="w"> </span>file1.c<span class="w"> </span><span class="sb">`</span>shmemcc<span class="w"> </span>--showme:compile<span class="sb">`</span>
shell$<span class="w"> </span>cc<span class="w"> </span>-c<span class="w"> </span>file2.c<span class="w"> </span><span class="sb">`</span>shmemcc<span class="w"> </span>--showme:compile<span class="sb">`</span>
shell$<span class="w"> </span>cc<span class="w"> </span>file1.o<span class="w"> </span>file2.o<span class="w"> </span><span class="sb">`</span>shmemcc<span class="w"> </span>--showme:link<span class="sb">`</span><span class="w"> </span>-o<span class="w"> </span>my_oshmem_program
</pre></div>
</div>
</div>
<div class="section" id="notes">
<h2><span class="section-number">18.1.1.7. </span>NOTES<a class="headerlink" href="#notes" title="Permalink to this heading"></a></h2>
<p>It is possible to make the wrapper compilers multi-lib aware. That is,
the libraries and includes specified may differ based on the compiler
flags specified (for example, with the GNU compilers on Linux, a
different library path may be used if <code class="docutils literal notranslate"><span class="pre">-m32</span></code> is seen versus <code class="docutils literal notranslate"><span class="pre">-m64</span></code>
being seen). This is not the default behavior in a standard build, but
can be activated (for example, in a binary package providing both 32
and 64 bit support). <a class="reference external" href="https://github.com/open-mpi/ompi/wiki/compilerwrapper3264">More information can be found here</a>.</p>
</div>
<div class="section" id="files">
<span id="man1-oshmem-wrapper-compiler-files"></span><h2><span class="section-number">18.1.1.8. </span>FILES<a class="headerlink" href="#files" title="Permalink to this heading"></a></h2>
<p>The strings that the wrapper compilers insert into the command line
before invoking the underlying compiler are stored in a text file
created by OpenSHMEM and installed to
<code class="docutils literal notranslate"><span class="pre">$pkgdata/NAME-wrapper-data.txt</span></code>, where:</p>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">$pkgdata</span></code> is typically <code class="docutils literal notranslate"><span class="pre">$prefix/share/openmpi</span></code></p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">$prefix</span></code> is the top installation directory of OpenSHMEM</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">NAME</span></code> is the name of the wrapper compiler (e.g.,
<code class="docutils literal notranslate"><span class="pre">$pkgdata/shmemcc-wrapper-data.txt</span></code>)</p></li>
</ul>
<p>It is rarely necessary to edit these files, but they can be examined to
gain insight into what flags the wrappers are placing on the command
line.</p>
</div>
<div class="section" id="environment-variables">
<h2><span class="section-number">18.1.1.9. </span>ENVIRONMENT VARIABLES<a class="headerlink" href="#environment-variables" title="Permalink to this heading"></a></h2>
<p>By default, the wrappers use the compilers that were selected when
OpenSHMEM was configured. These compilers were either found
automatically by Open MPI’s “configure” script, or were selected by
the user in the <code class="docutils literal notranslate"><span class="pre">CC</span></code>, <code class="docutils literal notranslate"><span class="pre">CXX</span></code>, and/or <code class="docutils literal notranslate"><span class="pre">FC</span></code> environment variables
before <code class="docutils literal notranslate"><span class="pre">configure</span></code> was invoked. Additionally, other arguments specific
to the compiler may have been selected by configure.</p>
<p>These values can be selectively overridden by either editing the text
files containing this configuration information (see the <a class="reference internal" href="#man1-oshmem-wrapper-compiler-files"><span class="std std-ref">FILES</span></a> section), or by setting selected
environment variables of the form <code class="docutils literal notranslate"><span class="pre">oshmem_value</span></code>.</p>
<p>Valid value names are:</p>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">CPPFLAGS</span></code>: Flags added when invoking the preprocessor (C or C++)</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">LDFLAGS</span></code>: Flags added when invoking the linker (C, C++, or
Fortran)</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">LIBS</span></code>: Libraries added when invoking the linker (C, C++, or
Fortran)</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">CC</span></code>: C compiler</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">CFLAGS</span></code>: C compiler flags</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">CXX</span></code>: C++ compiler</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">CXXFLAGS</span></code>: C++ compiler flags</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">FC</span></code>: Fortran compiler</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">FCFLAGS</span></code>: Fortran compiler flags</p></li>
</ul>
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