[Bug 1522606] [NEW] Unable to rebuild this package from Source - FTBFS

[Pascal Mons]

Public bug reported:

I am trying to compile on my Ubuntu Trusty 14.04 the latest source
cffi-1.3.1 in order to build the python-cffi package.

The source and debian folder are available at:

https://launchpad.net/ubuntu/+source/python-cffi

Here are the steps I took:

$ wget -P ~/Downloads/cffi https://launchpad.net/ubuntu/+archive/primary/+files/python-cffi_1.3.1.orig.tar.gz
$ wget -P ~/Downloads/cffi https://launchpad.net/ubuntu/+archive/primary/+files/python-cffi_1.3.1-1ubuntu1.debian.tar.xz
$ cd cffi
$ tar zxf python-cffi_1.3.1.orig.tar.gz
$ XZ_OPT=-9 tar Jcf python-cffi_1.3.1.orig.tar.xz cffi-1.3.1/
$ rm python-cffi_1.3.1.orig.tar.gz
$ tar xf python-cffi_1.3.1-1ubuntu1.debian.tar.xz -C cffi-1.3.1/
$ cd cffi-1.3.1/
$ dpkg-checkbuilddeps
$ dpkg-buildpackage -rfakeroot -us -uc -Zxz -z9

Then I stumble on this error:

running build_ext
failed to import Cython: /usr/lib/python2.7/dist-packages/Cython/Compiler/Scanning.so: undefined symbol: Py_InitModule4_64
error: Cython does not appear to be installed
[81526 refs]
E: pybuild pybuild:256: build: plugin distutils failed with: exit code=1: /usr/bin/python-dbg setup.py build 
dh_auto_build: pybuild --build -i python{version}-dbg -p 2.7 --dir . returned exit code 13
make: *** [build] Error 13
dpkg-buildpackage: error: debian/rules build gave error exit status 2

The symbol Py_InitModule4_64 is not defined in the shared library
Scanning.so, as the following cmd. confirms:

$ nm -gl /usr/lib/python2.7/dist-packages/Cython/Compiler/Scanning.so | grep Py_InitModule4_64
nm: /usr/lib/python2.7/dist-packages/Cython/Compiler/Scanning.so: no symbols
$ 

However from the Python environment the import seems to succeed:

$ python
Python 2.7.6 (default, Jun 22 2015, 17:58:13) 
[GCC 4.8.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from Cython.Compiler import Scanning
>>> 

As I was unable to recompile the latest source, I tried to recompile the "official" Trusty 14.04 source python-cffi_0.8.2.orig.tar.gz
And I stumbled on the very same error ...

What is wrong here ? Why can't we recompile the package from source ?

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: python-cffi (not installed)
ProcVersionSignature: Ubuntu 3.19.0-37.42~14.04.1-generic 3.19.8-ckt9
Uname: Linux 3.19.0-37-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: amd64
CurrentDesktop: Unity
Date: Thu Dec  3 16:47:27 2015
InstallationDate: Installed on 2014-12-19 (348 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
ProcEnviron:
 LANGUAGE=en_US
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: python-cffi
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: python-cffi (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug trusty

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Title:
  Unable to rebuild this package from Source - FTBFS

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