[Bug 1196047] [NEW] PyIter_Check macros is not working in applications that embed python

[ZyX]

Public bug reported:

When trying to use PyIter_Check macros in applications that embed python
interpreter (like vim) it always evaluates to TRUE because
_PyObject_NextNotImplemented function has different address seen in vim
C functions and python library. As address of this function is assigned
always in C library code and checked in vim check is always TRUE. More
details are here:
https://groups.google.com/forum/?fromgroups=#!searchin/vim_dev/tests/vim_dev/CEaL812aLNI/aSuZ0Jin8BQJ.
Problem was tracked down to the presence of “-Bsymbolic-functions”
linking flag.

Checked with manually unpacked libpython2.7_2.7.3-5ubuntu4_amd64.deb on
Gentoo host. In the referenced topic same problem is reported for
“Ubuntu 12.10 with Python 2.7.3” (Bram Moolenaar) and “Ubuntu 13.04”
(Yukihiro Nakadaira).

** Affects: python2.7 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1196047

Title:
  PyIter_Check macros is not working in applications that embed python

Status in “python2.7” package in Ubuntu:
  New

Bug description:
  When trying to use PyIter_Check macros in applications that embed
  python interpreter (like vim) it always evaluates to TRUE because
  _PyObject_NextNotImplemented function has different address seen in
  vim C functions and python library. As address of this function is
  assigned always in C library code and checked in vim check is always
  TRUE. More details are here:
  https://groups.google.com/forum/?fromgroups=#!searchin/vim_dev/tests/vim_dev/CEaL812aLNI/aSuZ0Jin8BQJ.
  Problem was tracked down to the presence of “-Bsymbolic-functions”
  linking flag.

  Checked with manually unpacked libpython2.7_2.7.3-5ubuntu4_amd64.deb
  on Gentoo host. In the referenced topic same problem is reported for
  “Ubuntu 12.10 with Python 2.7.3” (Bram Moolenaar) and “Ubuntu 13.04”
  (Yukihiro Nakadaira).

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