scons compiledb generated-sources

Building compilation database compile_commands.json
scons: done building targets.
NotImplementedError: :
  File "/usr/lib/python2.7/site-packages/SCons/Script/Main.py", line 1374:
    _exec_main(parser, values)
  File "/usr/lib/python2.7/site-packages/SCons/Script/Main.py", line 1337:
    _main(parser)
  File "/usr/lib/python2.7/site-packages/SCons/Script/Main.py", line 1102:
    nodes = _build_targets(fs, options, targets, target_top)
  File "/usr/lib/python2.7/site-packages/SCons/Script/Main.py", line 1299:
    jobs.run(postfunc = jobs_postfunc)
  File "/usr/lib/python2.7/site-packages/SCons/Job.py", line 111:
    self.job.start()
  File "/usr/lib/python2.7/site-packages/SCons/Job.py", line 216:
    task.executed()
  File "/usr/lib/python2.7/site-packages/SCons/Script/Main.py", line 235:
    SCons.Taskmaster.OutOfDateTask.executed(self)
  File "/usr/lib/python2.7/site-packages/SCons/Taskmaster.py", line 310:
    t.release_target_info()
  File "/usr/lib/python2.7/site-packages/SCons/Node/FS.py", line 3009:
    self.changed(allowcache=True)
  File "/usr/lib/python2.7/site-packages/SCons/Node/FS.py", line 3260:
    has_changed = SCons.Node.Node.changed(self, node)
  File "/usr/lib/python2.7/site-packages/SCons/Node/__init__.py", line 1442:
    if _decider_map[child.changed_since_last_build](child, self, prev_ni):
  File "/usr/lib/python2.7/site-packages/SCons/Node/__init__.py", line 265:
    raise NotImplementedError
scons compiledb  8.53s user 0.17s system 99% cpu 8.719 total