[Python-modules-team] Bug#800239: py3cairo: FTBFS with python3.5 as a supported python3 version

[Scott Kitterman]

Source: py3cairo
Version: 1.10.0+dfsg-4
Severity: serious
Justification: fails to build from source (but built successfully in the past)

py3cairo FTBFS when binNMUed to add support for python3.5.  Here's what
appears to be the relevant bit of the build log:

Checking for library python3.5 in LIBDIR : 06:20:11 runner ['/usr/bin/gcc', '-D_FORTIFY_SOURCE=2', '-g', '-O2', '-fstack-protector-strong', '-Wformat', '-Werror=format-security', '-pthread', '-fwrapv', '-fstack-protector-strong', '-flto', '-fuse-linker-plugin', '-ffat-lto-objects', '-DPYTHONDIR="/usr/lib/python3/dist-packages"', '-DPYTHONARCHDIR="[\'/usr/lib/python3/dist-packages\']"', '-DNDEBUG', '../test.c', '-c', '-o', 'test.c.0.o']
06:20:11 runner ['/usr/bin/gcc', 'test.c.0.o', '-o', '/«BUILDDIR»/py3cairo-1.10.0+dfsg/build3.5/.conf_check_48bc0baa924006e4ec070860d537efdb/testbuild/testprog', '-Wl,-Bstatic', '-Wl,-Bdynamic', '-L/usr/lib', '-lpython3.5', '-Wl,-z,relro', '-Wl,-z,relro', '-pthread', '-Wl,-O1', '-Wl,-Bsymbolic-functions', '-Wl,-z,relro']
  ./options()
  ./configure()
Traceback (most recent call last):
  File "/«BUILDDIR»/py3cairo-1.10.0+dfsg/waflib/Scripting.py", line 93, in waf_entry_point
    run_commands()
  File "/«BUILDDIR»/py3cairo-1.10.0+dfsg/waflib/Scripting.py", line 145, in run_commands
    run_command(cmd_name)
  File "/«BUILDDIR»/py3cairo-1.10.0+dfsg/waflib/Scripting.py", line 138, in run_command
    ctx.execute()
  File "/«BUILDDIR»/py3cairo-1.10.0+dfsg/waflib/Configure.py", line 124, in execute
    super(ConfigurationContext,self).execute()
  File "/«BUILDDIR»/py3cairo-1.10.0+dfsg/waflib/Context.py", line 87, in execute
    self.recurse([os.path.dirname(g_module.root_path)])
  File "/«BUILDDIR»/py3cairo-1.10.0+dfsg/waflib/Context.py", line 127, in recurse
    user_function(self)
  File "/«BUILDDIR»/py3cairo-1.10.0+dfsg/wscript", line 29, in configure
    ctx.check_python_headers()
  File "/«BUILDDIR»/py3cairo-1.10.0+dfsg/waflib/Configure.py", line 217, in fun
    return f(*k,**kw)
  File "/«BUILDDIR»/py3cairo-1.10.0+dfsg/waflib/Tools/python.py", line 146, in check_python_headers
    result=conf.check(lib=name,uselib='PYEMBED',libpath=path,mandatory=False,msg='Checking for library %s in LIBDIR'%name)
  File "/«BUILDDIR»/py3cairo-1.10.0+dfsg/waflib/Configure.py", line 217, in fun
    return f(*k,**kw)
  File "/«BUILDDIR»/py3cairo-1.10.0+dfsg/waflib/Tools/c_config.py", line 357, in check
    ret=self.run_c_code(*k,**kw)
  File "/«BUILDDIR»/py3cairo-1.10.0+dfsg/waflib/Configure.py", line 217, in fun
    return f(*k,**kw)
  File "/«BUILDDIR»/py3cairo-1.10.0+dfsg/waflib/Tools/c_config.py", line 435, in run_c_code
    bld.compile()
  File "/«BUILDDIR»/py3cairo-1.10.0+dfsg/waflib/Tools/errcheck.py", line 95, in check_compile
    ret=old_compile(self)
  File "/«BUILDDIR»/py3cairo-1.10.0+dfsg/waflib/Build.py", line 190, in compile
    self.store()
  File "/«BUILDDIR»/py3cairo-1.10.0+dfsg/waflib/Utils.py", line 300, in f
    ret=fun(*k,**kw)
  File "/«BUILDDIR»/py3cairo-1.10.0+dfsg/waflib/Build.py", line 164, in store
    cPickle.dump(data,f)
AttributeError: Can't pickle local object 'Context.__init__.<locals>.node_class'

It does look like there is a fix for this in Ubuntu [1].

Scott K

[1] https://launchpad.net/ubuntu/+source/py3cairo/1.10.0+dfsg-4ubuntu2