[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@…):

 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.

 I have no idea what why that does not happen in the prebuilt package.
 Presumably there is something different in the build environment.

 It's always tricky how python chooses the compiler it uses to compile
 stuff (usually, it would like to use the same compiler as it is compiled
 with itself, which is clang). With scipy/numpy it's even more tricky, and
 I didn't figure out yet how to change the compiler for the linkage ...
 (setting LDSHARED breaks stuff in the Fortran compilation)

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Ticket URL: <https://trac.macports.org/ticket/35141#comment:10>
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