New subject: [kamailio/kamailio] app_python warning about strict-aliasing (#1249)

27 Sep 2017

Tracking here the issue exposed by @linuxmaniac via PR #924, as it was merged and then
reverted (by #1248), so anyone can be aware of as well as comment/propose solutions for
it.

...
     Add "-fno-strict-aliasing" to compilation
flags

    Fixes a slew of:
      "dereferencing type-punned pointer will break strict-aliasing rules"
    warnings from GCC for lines of the form:
      Py_INCREF(Py_True);
    and
      Py_INCREF(Py_False);

    due to the cast from PyIntObject* to PyObject*

    GCC is technically correct here; see:
      http://www.python.org/dev/peps/pep-3123/
    though this is unlikely to lead to non-working machine code. 
The initial proposed patch for `src/modules/app_python/Makefile` is:

```

 @@ -22,6 +22,8 @@ ifeq ($(OS), freebsd)
  LIBS+=-pthread
  endif

 +# python2 https://www.python.org/dev/peps/pep-3123/
 +DEFS+=-fno-strict-aliasing
  DEFS+=-I${PYTHON_INCDIR}
  DEFS+=-DKAMAILIO_MOD_INTERFACE
```

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