[MacPorts] #50958: py-graph-tool fails to build with clang OpenMP option (configure.args=--enable-openmp)

[MacPorts]

#50958: py-graph-tool fails to build with clang OpenMP option (configure.args
=--enable-openmp)
--------------------------------------------+------------------------------
 Reporter:  s.t.smith@…                     |      Owner:  macports-
     Type:  defect                          |  tickets@…
 Priority:  Normal                          |     Status:  new
Component:  ports                           |  Milestone:
 Keywords:  graph-tool clang openmp libomp  |    Version:  2.3.4
                                            |       Port:  py-graph-tool
--------------------------------------------+------------------------------
 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 expected that the option `configure.args=--enable-openmp` would tell the
 autoconf'd `./configure` command to specify `--enable-openmp`, but it does
 not:


 {{{
 # uninstall existing graph-tool
 sudo port uninstall py-graph-tool py27-graph-tool
 sudo port clean --dist py-graph-tool py27-graph-tool

 # build new graph-tool with OpenMP support
 sudo port install clang-3.8 +openmp
 sudo port -d install py-graph-tool py27-graph-tool configure.compiler
 =macports-clang-3.8 configure.args=--enable-openmp

 …
 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
 …
 checking whether to enable parallel algorithms with openmp... no
 }}}

 The port notes for `libomp` say:

 {{{
 Use with clang-3.[78] (when built with +openmp variant) by adding
 "-fopenmp" to your compile and link lines.
 (Or "-I/opt/local/include/libomp -L/opt/local/lib/libomp -fopenmp"
 if clang is installed without +openmp.)
 }}}

 Based on the Port Phases page
 https://guide.macports.org/chunked/reference.phases.htm, I've tried a
 variety of options like `configure.cxxflags-append=-fopenmp`, all without
 success.

 I'd also ask for consideration whether adding OpenMP support should be the
 default behavior for the Macports graph-tool build now that it's
 available.

-- 
Ticket URL: <https://trac.macports.org/ticket/50958>
MacPorts <https://www.macports.org/>
Ports system for OS X