[MacPorts] #35141: py*-scipy + gcc45: ___ieee_divdc3 symbol not found

[MacPorts]

#35141: py*-scipy + gcc45: ___ieee_divdc3 symbol not found
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  Reporter:  andre.dos.anjos@…  |      Owner:  macports-tickets@…
      Type:  defect             |     Status:  new
  Priority:  Normal             |  Milestone:
 Component:  ports              |    Version:  2.1.1
Resolution:                     |   Keywords:
      Port:  py26-scipy         |
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Comment (by wimmer@…):

 Replying to [comment:12 Peter.Danecek@…]:
 > Replying to [comment:10 wimmer@…]:
 > > Let me note that I get the same problem for python 2.7 on OSX 10.8
 when I install from source using "port install -s py27-scipy", instead of
 installing the prebuilt version. I looked into the problem, and figured
 out that the problem is due to the fact that scipy compiles all code with
 the macports gcc/gfortran, but when building the shared library object
 spline.so links with clang - hence the symbol {{{___ieee_divdc3}}} which
 is specific to gcc is not found. In fact, clang is used for all modules
 based on C-code (not Fortran code). You can see this in the attached
 build.log.
 >
 > Well, if this is really due to the fact that clang is used for linking,
 why this would happen on a 10.5 system?
 > As far as I remember there is no clang, yet.

 It is clang on my 10.8, could be gcc-4.2 on 10.5, for example. Also, it
 might depend on the python version, as different python versions have
 different logic on figuring out which compiler to use (python usually
 wants to compile things with the same compiler as it is compiled itself)
 ... it is possible that the problem for python2.7 only shows up since a
 very recent update of python2.7.

 In any case {{{___ieee_divdc3}}} is apparently a GNU gcc symbol, and the
 error is also in the previous cases probably due to the linker not linking
 against the GNU gcc libraries (as probably an Apple compiler was used for
 linking).

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Ticket URL: <https://trac.macports.org/ticket/35141#comment:14>
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