[MacPorts] #39217: py27-numpy @1.7.1_0: import fails due to missing symbol

[MacPorts]

#39217: py27-numpy @1.7.1_0: import fails due to missing symbol
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  Reporter:  jdgleeson@…  |      Owner:  macports-tickets@…
      Type:  defect       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.1.3
Resolution:               |   Keywords:
      Port:  py27-numpy   |
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Comment (by nad@…):

 Looking at the log, it appears that, for each C extension module,
 /opt47/local/bin/gcc-mp-4.7 is being used by Distutils for the compile
 step but /usr/bin/gcc-4.0 is used for the link step (-bundle).  Normally,
 the same compiler should be used for both.  By default, Distutils tries to
 use the same compiler and options as was used to build Python itself,
 unless overridden.  In particular, the CC env variable is used to override
 the compiler in the CC config var and the LDSHARED env var is used to
 supply the compiler and link options from the LDSHARED config var.  (You
 can inspect Python's configuration variables with
 sysconfig.get_config_var('CC') or ('LDSHARED').)  With Python 2.7.3,
 setting a CC environment variable to override the compiler caused
 Distutils to update the compiler string in LDSHARED as well.
 Unfortunately, in Python 2.7.4 (and 2.7.5), the update of LDSHARED when CC
 is specified no longer happens; if you use CC env variable to supply a
 different compiler, you also need to inspect the LDSHARED config var and
 supply a complete modified string in an LDSHARED env variable.  I've
 opened an upstream issue to restore the inadvertently changed behavior
 (http://bugs.python.org/issue18080) and attached a patch that should fix
 the problem for 2.7.5.  I have not looked into the Numpy build process nor
 the MacPorts changes to see if this is the same problem but reading the
 log here rang a bell.  You could try to apply the patch to the MacPorts
 Python 2.7.5 and see if it fixes the problem.  There were other rather
 extensive changes in Distutils to better support Xcode 4 for Python 2.7.4
 so it is possible that something else in them may have affected Numpy
 builds.

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Ticket URL: <https://trac.macports.org/ticket/39217#comment:5>
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