Switch to using a submodule for autowaf

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diff --git a/waflib b/waflib
new file mode 160000
+Subproject 2314e236ca6e7d94a26c3c17091da0f25f5867f
diff --git a/waflib/extras/pytest.py b/waflib/extras/pytest.py
deleted file mode 100644
index 7dd5a1a..0000000
--- a/waflib/extras/pytest.py
+++ /dev/null
@@ -1,225 +0,0 @@
-#! /usr/bin/env python
-# encoding: utf-8
-# Calle Rosenquist, 2016-2018 (xbreak)
-
-"""
-Provides Python unit test support using :py:class:`waflib.Tools.waf_unit_test.utest`
-task via the **pytest** feature.
-
-To use pytest the following is needed:
-
-1. Load `pytest` and the dependency `waf_unit_test` tools.
-2. Create a task generator with feature `pytest` (not `test`) and customize behaviour with
-   the following attributes:
-
-   - `pytest_source`: Test input files.
-   - `ut_str`: Test runner command, e.g. ``${PYTHON} -B -m unittest discover`` or
-               if nose is used: ``${NOSETESTS} --no-byte-compile ${SRC}``.
-   - `ut_shell`: Determines if ``ut_str`` is executed in a shell. Default: False.
-   - `ut_cwd`: Working directory for test runner. Defaults to directory of
-               first ``pytest_source`` file.
-
-   Additionally the following `pytest` specific attributes are used in dependent taskgens:
-
-   - `pytest_path`: Node or string list of additional Python paths.
-   - `pytest_libpath`: Node or string list of additional library paths.
-
-The `use` dependencies are used for both update calculation and to populate
-the following environment variables for the `pytest` test runner:
-
-1. `PYTHONPATH` (`sys.path`) of any dependent taskgen that has the feature `py`:
-
-   - `install_from` attribute is used to determine where the root of the Python sources
-      are located. If `install_from` is not specified the default is to use the taskgen path
-      as the root.
-
-   - `pytest_path` attribute is used to manually specify additional Python paths.
-
-2. Dynamic linker search path variable (e.g. `LD_LIBRARY_PATH`) of any dependent taskgen with
-   non-static link_task.
-
-   - `pytest_libpath` attribute is used to manually specify additional linker paths.
-
-Note: `pytest` cannot automatically determine the correct `PYTHONPATH` for `pyext` taskgens
-      because the extension might be part of a Python package or used standalone:
-
-      - When used as part of another `py` package, the `PYTHONPATH` is provided by
-      that taskgen so no additional action is required.
-
-      - When used as a standalone module, the user needs to specify the `PYTHONPATH` explicitly
-      via the `pytest_path` attribute on the `pyext` taskgen.
-
-      For details c.f. the pytest playground examples.
-
-
-For example::
-
-    # A standalone Python C extension that demonstrates unit test environment population
-    # of PYTHONPATH and LD_LIBRARY_PATH/PATH/DYLD_LIBRARY_PATH.
-    #
-    # Note: `pytest_path` is provided here because pytest cannot automatically determine
-    # if the extension is part of another Python package or is used standalone.
-    bld(name         = 'foo_ext',
-        features     = 'c cshlib pyext',
-        source       = 'src/foo_ext.c',
-        target       = 'foo_ext',
-        pytest_path  = [ bld.path.get_bld() ])
-
-    # Python package under test that also depend on the Python module `foo_ext`
-    #
-    # Note: `install_from` is added automatically to `PYTHONPATH`.
-    bld(name         = 'foo',
-        features     = 'py',
-        use          = 'foo_ext',
-        source       = bld.path.ant_glob('src/foo/*.py'),
-        install_from = 'src')
-
-    # Unit test example using the built in module unittest and let that discover
-    # any test cases.
-    bld(name          = 'foo_test',
-        features      = 'pytest',
-        use           = 'foo',
-        pytest_source = bld.path.ant_glob('test/*.py'),
-        ut_str        = '${PYTHON} -B -m unittest discover')
-
-"""
-
-import os
-from waflib import Task, TaskGen, Errors, Utils, Logs
-from waflib.Tools import ccroot
-
-def _process_use_rec(self, name):
-	"""
-	Recursively process ``use`` for task generator with name ``name``..
-	Used by pytest_process_use.
-	"""
-	if name in self.pytest_use_not or name in self.pytest_use_seen:
-		return
-	try:
-		tg = self.bld.get_tgen_by_name(name)
-	except Errors.WafError:
-		self.pytest_use_not.add(name)
-		return
-
-	self.pytest_use_seen.append(name)
-	tg.post()
-
-	for n in self.to_list(getattr(tg, 'use', [])):
-		_process_use_rec(self, n)
-
-
-@TaskGen.feature('pytest')
-@TaskGen.after_method('process_source', 'apply_link')
-def pytest_process_use(self):
-	"""
-	Process the ``use`` attribute which contains a list of task generator names and store
-	paths that later is used to populate the unit test runtime environment.
-	"""
-	self.pytest_use_not = set()
-	self.pytest_use_seen = []
-	self.pytest_paths = [] # strings or Nodes
-	self.pytest_libpaths = [] # strings or Nodes
-	self.pytest_dep_nodes = []
-
-	names = self.to_list(getattr(self, 'use', []))
-	for name in names:
-		_process_use_rec(self, name)
-	
-	def extend_unique(lst, varlst):
-		ext = []
-		for x in varlst:
-			if x not in lst:
-				ext.append(x)
-		lst.extend(ext)
-
-	# Collect type specific info needed to construct a valid runtime environment
-	# for the test.
-	for name in self.pytest_use_seen:
-		tg = self.bld.get_tgen_by_name(name)
-
-		extend_unique(self.pytest_paths, Utils.to_list(getattr(tg, 'pytest_path', [])))
-		extend_unique(self.pytest_libpaths, Utils.to_list(getattr(tg, 'pytest_libpath', [])))
-
-		if 'py' in tg.features:
-			# Python dependencies are added to PYTHONPATH
-			pypath = getattr(tg, 'install_from', tg.path)
-
-			if 'buildcopy' in tg.features:
-				# Since buildcopy is used we assume that PYTHONPATH in build should be used,
-				# not source
-				extend_unique(self.pytest_paths, [pypath.get_bld().abspath()])
-
-				# Add buildcopy output nodes to dependencies
-				extend_unique(self.pytest_dep_nodes, [o for task in getattr(tg, 'tasks', []) \
-														for o in getattr(task, 'outputs', [])])
-			else:
-				# If buildcopy is not used, depend on sources instead
-				extend_unique(self.pytest_dep_nodes, tg.source)
-				extend_unique(self.pytest_paths, [pypath.abspath()])
-
-		if getattr(tg, 'link_task', None):
-			# For tasks with a link_task (C, C++, D et.c.) include their library paths:
-			if not isinstance(tg.link_task, ccroot.stlink_task):
-				extend_unique(self.pytest_dep_nodes, tg.link_task.outputs)
-				extend_unique(self.pytest_libpaths, tg.link_task.env.LIBPATH)
-
-				if 'pyext' in tg.features:
-					# If the taskgen is extending Python we also want to add the interpreter libpath.
-					extend_unique(self.pytest_libpaths, tg.link_task.env.LIBPATH_PYEXT)
-				else:
-					# Only add to libpath if the link task is not a Python extension
-					extend_unique(self.pytest_libpaths, [tg.link_task.outputs[0].parent.abspath()])
-
-
-@TaskGen.feature('pytest')
-@TaskGen.after_method('pytest_process_use')
-def make_pytest(self):
-	"""
-	Creates a ``utest`` task with a populated environment for Python if not specified in ``ut_env``:
-
-	- Paths in `pytest_paths` attribute are used to populate PYTHONPATH
-	- Paths in `pytest_libpaths` attribute are used to populate the system library path (e.g. LD_LIBRARY_PATH)
-	"""
-	nodes = self.to_nodes(self.pytest_source)
-	tsk = self.create_task('utest', nodes)
-	
-	tsk.dep_nodes.extend(self.pytest_dep_nodes)
-	if getattr(self, 'ut_str', None):
-		self.ut_run, lst = Task.compile_fun(self.ut_str, shell=getattr(self, 'ut_shell', False))
-		tsk.vars = lst + tsk.vars
-
-	if getattr(self, 'ut_cwd', None):
-		if isinstance(self.ut_cwd, str):
-			# we want a Node instance
-			if os.path.isabs(self.ut_cwd):
-				self.ut_cwd = self.bld.root.make_node(self.ut_cwd)
-			else:
-				self.ut_cwd = self.path.make_node(self.ut_cwd)
-	else:
-		if tsk.inputs:
-			self.ut_cwd = tsk.inputs[0].parent
-		else:
-			raise Errors.WafError("no valid input files for pytest task, check pytest_source value")
-
-	if not self.ut_cwd.exists():
-		self.ut_cwd.mkdir()
-
-	if not hasattr(self, 'ut_env'):
-		self.ut_env = dict(os.environ)
-		def add_paths(var, lst):
-			# Add list of paths to a variable, lst can contain strings or nodes
-			lst = [ str(n) for n in lst ]
-			Logs.debug("ut: %s: Adding paths %s=%s", self, var, lst)
-			self.ut_env[var] = os.pathsep.join(lst) + os.pathsep + self.ut_env.get(var, '')
-
-		# Prepend dependency paths to PYTHONPATH and LD_LIBRARY_PATH
-		add_paths('PYTHONPATH', self.pytest_paths)
-
-		if Utils.is_win32:
-			add_paths('PATH', self.pytest_libpaths)
-		elif Utils.unversioned_sys_platform() == 'darwin':
-			add_paths('DYLD_LIBRARY_PATH', self.pytest_libpaths)
-			add_paths('LD_LIBRARY_PATH', self.pytest_libpaths)
-		else:
-			add_paths('LD_LIBRARY_PATH', self.pytest_libpaths)
-