scons compiledb exits with a stack trace

$ python3 buildscripts/scons.py compiledb

...

scons: done reading SConscript files.

scons: Building targets ...

Building compilation database compile_commands.json

scons: done building targets.

TypeError: changed_since_last_build_node() takes 3 positional arguments but 4 were given:

  File "/home/mark/src/mongo/src/third_party/scons-3.1.1/scons-local-3.1.1/SCons/Script/Main.py", line 1374:

    _exec_main(parser, values)

  File "/home/mark/src/mongo/src/third_party/scons-3.1.1/scons-local-3.1.1/SCons/Script/Main.py", line 1337:

    _main(parser)

  File "/home/mark/src/mongo/src/third_party/scons-3.1.1/scons-local-3.1.1/SCons/Script/Main.py", line 1112:

    nodes = _build_targets(fs, options, targets, target_top)

  File "/home/mark/src/mongo/src/third_party/scons-3.1.1/scons-local-3.1.1/SCons/Script/Main.py", line 1311:

    jobs.run(postfunc = jobs_postfunc)

  File "/home/mark/src/mongo/src/third_party/scons-3.1.1/scons-local-3.1.1/SCons/Job.py", line 111:

    self.job.start()

  File "/home/mark/src/mongo/src/third_party/scons-3.1.1/scons-local-3.1.1/SCons/Job.py", line 410:

    task.executed()

  File "/home/mark/src/mongo/src/third_party/scons-3.1.1/scons-local-3.1.1/SCons/Script/Main.py", line 252:

    SCons.Taskmaster.OutOfDateTask.executed(self)

  File "/home/mark/src/mongo/src/third_party/scons-3.1.1/scons-local-3.1.1/SCons/Taskmaster.py", line 317:

    t.release_target_info()

  File "/home/mark/src/mongo/src/third_party/scons-3.1.1/scons-local-3.1.1/SCons/Node/FS.py", line 3046:

    self.changed(allowcache=True)

  File "/home/mark/src/mongo/src/third_party/scons-3.1.1/scons-local-3.1.1/SCons/Node/FS.py", line 3289:

    has_changed = SCons.Node.Node.changed(self, node)

  File "/home/mark/src/mongo/src/third_party/scons-3.1.1/scons-local-3.1.1/SCons/Node/__init__.py", line 1493:

    if _decider_map[child.changed_since_last_build](child, self, prev_ni, node):