Macports clang 3.7 and 3.8 now support openmp, which creates the opportunity to build graph-tool on OS X with OpenMP speeds.

I've tried the following, which haven't quite worked yet, but it's close. Any pointers would be appreciated.

<blockquote style='border-left:2px solid #CCCCCC;padding:0 1em'>
sudo port uninstall py-graph-tool py27-graph-tool<br/>
sudo port clean --dist py-graph-tool py27-graph-tool<br/>
<br/>
sudo port install clang-3.8 +openmp<br/>
sudo port -d install py-graph-tool py27-graph-tool configure.compiler=macports-clang-3.8 configure.args=--enable-openmp<br/>
</blockquote>

I expected the option "configure.args=--enable-openmp" would tell the autoconf'd ./configure command to specify --enable-openmp, but it does not:

<blockquote style='border-left:2px solid #CCCCCC;padding:0 1em'>
DEBUG: Executing command line:  cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_python_py-graph-tool/py27-graph-tool/work/graph-tool-2.13" && ./configure --prefix=/opt/local --with-boost=/opt/local --exec-prefix=/opt/local/Library/Frameworks/Python.framework/Versions/2.7<br/>
… <br/>
checking whether to enable parallel algorithms with openmp... no<br/>
</blockquote>

The port notes for clang-3.8 say:

<blockquote style='border-left:2px solid #CCCCCC;padding:0 1em'>
Use with clang-3.[78] (when built with +openmp variant) by adding<br/>
"-fopenmp" to your compile and link lines.<br/>
(Or "-I/opt/local/include/libomp -L/opt/local/lib/libomp -fopenmp"<br/>
if clang is installed without +openmp.)<br/>
</blockquote>

Based on the <a href="https://guide.macports.org/chunked/reference.phases.htm" target="_top" rel="nofollow" link="external">Port Phases</a> page, I've tried a variety of options like configure.cxxflags-append=-fopenmp, all without success. Perhaps a custom portfile is necessary, but this would be easiest to address through the port command line.

	
	
	
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