[MacPorts] #54238: graph_tool.centrality.pagerank throws a segmentation fault (v. 2.22) with clang-4.0

[MacPorts]

#54238: graph_tool.centrality.pagerank throws a segmentation fault (v. 2.22) with
clang-4.0
-----------------------+-----------------------------
 Reporter:  essandess  |      Owner:
     Type:  defect     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:  2.4.1
 Keywords:             |       Port:  py34-graph-tool
-----------------------+-----------------------------
 This may be related to #380 because `pagerank` uses OpenMP code.

 This is macOS 10.12.4, Macports graph-tool, python 3.4:

 ```
 port -qv installed | grep graph-tool
   py34-graph-tool @2.22_0+clang38+openmp (active) platform='darwin 16'

 2.22 (commit 44bf2b92, Thu Mar 2 23:08:39 2017 +0000)
 ```

 SSCCE:

 ```
 import graph_tool, graph_tool.all as gt
 import numpy as np, numpy.random as npr

 print(gt.__version__)

 # Erdős–Rényi
 N = 5000
 p = 1.5 * np.log(N)/N
 g = gt.random_graph(N, deg_sampler=lambda: npr.poisson((N-1)*p),
 directed=False, model='erdos')

 # Segmentation fault
 pr = graph_tool.centrality.pagerank(g)
 ```

 Using clang-4.0 fixes the issue:

 This worked for me:

 ```
 sudo port -p -N install py34-graph-tool configure.compiler=macports-
 clang-4.0 configure.args-append=--enable-openmp
 ```

 Would you please update the portfile to use clang-4.0?

--
Ticket URL: <https://trac.macports.org/ticket/54238>
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