buildroot/package/samba4/0002-waf-upgrade-to-2.0.18.patch

From 9fdae71c29e7e80f463c0205b508d52c2bb7385b Mon Sep 17 00:00:00 2001
From: Uri Simchoni <uri@samba.org>
Date: Mon, 7 Oct 2019 00:36:42 +0300
Subject: [PATCH] waf: upgrade to 2.0.18

This is required to get the new test_args parameter to conf.check, which
facilitates passing arguments to configuration test programs.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=13846

Signed-off-by: Uri Simchoni <uri@samba.org>
Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
---
 buildtools/bin/waf                            |   2 +-
 buildtools/wafsamba/wafsamba.py               |   2 +-
 third_party/waf/waflib/Configure.py           |  20 +-
 third_party/waf/waflib/Context.py             |   6 +-
 third_party/waf/waflib/Scripting.py           |   7 +-
 third_party/waf/waflib/TaskGen.py             |   2 +-
 third_party/waf/waflib/Tools/asm.py           |  37 +++-
 third_party/waf/waflib/Tools/c_aliases.py     |   6 +-
 third_party/waf/waflib/Tools/c_config.py      |   9 +-
 third_party/waf/waflib/Tools/c_tests.py       |   3 +-
 third_party/waf/waflib/Tools/gas.py           |   1 +
 third_party/waf/waflib/Tools/javaw.py         |   2 +-
 third_party/waf/waflib/Tools/nasm.py          |   5 +
 third_party/waf/waflib/Tools/python.py        |  27 ++-
 third_party/waf/waflib/extras/doxygen.py      |  11 +-
 third_party/waf/waflib/extras/fast_partial.py |  28 ++-
 third_party/waf/waflib/extras/genpybind.py    | 194 ++++++++++++++++++
 third_party/waf/waflib/extras/local_rpath.py  |   8 +-
 third_party/waf/waflib/extras/objcopy.py      |   9 +-
 19 files changed, 329 insertions(+), 50 deletions(-)
 create mode 100644 third_party/waf/waflib/extras/genpybind.py

diff --git a/buildtools/bin/waf b/buildtools/bin/waf
index 8413f2332b7..11ce8e7480a 100755
--- a/buildtools/bin/waf
+++ b/buildtools/bin/waf
@@ -32,7 +32,7 @@ POSSIBILITY OF SUCH DAMAGE.
 
 import os, sys, inspect
 
-VERSION="2.0.17"
+VERSION="2.0.18"
 REVISION="x"
 GIT="x"
 INSTALL="x"
diff --git a/buildtools/wafsamba/wafsamba.py b/buildtools/wafsamba/wafsamba.py
index 76d65ebfcb6..205d5b4ac32 100644
--- a/buildtools/wafsamba/wafsamba.py
+++ b/buildtools/wafsamba/wafsamba.py
@@ -38,7 +38,7 @@ LIB_PATH="shared"
 
 os.environ['PYTHONUNBUFFERED'] = '1'
 
-if Context.HEXVERSION not in (0x2001100,):
+if Context.HEXVERSION not in (0x2001200,):
     Logs.error('''
 Please use the version of waf that comes with Samba, not
 a system installed version. See http://wiki.samba.org/index.php/Waf
diff --git a/third_party/waf/waflib/Configure.py b/third_party/waf/waflib/Configure.py
index db09c0e3a40..5762eb66954 100644
--- a/third_party/waf/waflib/Configure.py
+++ b/third_party/waf/waflib/Configure.py
@@ -524,7 +524,7 @@ def run_build(self, *k, **kw):
 	Though this function returns *0* by default, the build may set an attribute named *retval* on the
 	build context object to return a particular value. See :py:func:`waflib.Tools.c_config.test_exec_fun` for example.
 
-	This function also provides a limited cache. To use it, provide the following option::
+	This function also features a cache which can be enabled by the following option::
 
 		def options(opt):
 			opt.add_option('--confcache', dest='confcache', default=0,
@@ -535,10 +535,21 @@ def run_build(self, *k, **kw):
 		$ waf configure --confcache
 
 	"""
-	lst = [str(v) for (p, v) in kw.items() if p != 'env']
-	h = Utils.h_list(lst)
+	buf = []
+	for key in sorted(kw.keys()):
+		v = kw[key]
+		if hasattr(v, '__call__'):
+			buf.append(Utils.h_fun(v))
+		else:
+			buf.append(str(v))
+	h = Utils.h_list(buf)
 	dir = self.bldnode.abspath() + os.sep + (not Utils.is_win32 and '.' or '') + 'conf_check_' + Utils.to_hex(h)
 
+	cachemode = kw.get('confcache', getattr(Options.options, 'confcache', None))
+
+	if not cachemode and os.path.exists(dir):
+		shutil.rmtree(dir)
+
 	try:
 		os.makedirs(dir)
 	except OSError:
@@ -549,7 +560,6 @@ def run_build(self, *k, **kw):
 	except OSError:
 		self.fatal('cannot use the configuration test folder %r' % dir)
 
-	cachemode = getattr(Options.options, 'confcache', None)
 	if cachemode == 1:
 		try:
 			proj = ConfigSet.ConfigSet(os.path.join(dir, 'cache_run_build'))
@@ -589,7 +599,7 @@ def run_build(self, *k, **kw):
 		else:
 			ret = getattr(bld, 'retval', 0)
 	finally:
-		if cachemode == 1:
+		if cachemode:
 			# cache the results each time
 			proj = ConfigSet.ConfigSet()
 			proj['cache_run_build'] = ret
diff --git a/third_party/waf/waflib/Context.py b/third_party/waf/waflib/Context.py
index d0759aada58..e3305fa3341 100644
--- a/third_party/waf/waflib/Context.py
+++ b/third_party/waf/waflib/Context.py
@@ -11,13 +11,13 @@ from waflib import Utils, Errors, Logs
 import waflib.Node
 
 # the following 3 constants are updated on each new release (do not touch)
-HEXVERSION=0x2001100
+HEXVERSION=0x2001200
 """Constant updated on new releases"""
 
-WAFVERSION="2.0.17"
+WAFVERSION="2.0.18"
 """Constant updated on new releases"""
 
-WAFREVISION="6bc6cb599c702e985780e9f705b291b812123693"
+WAFREVISION="314689b8994259a84f0de0aaef74d7ce91f541ad"
 """Git revision when the waf version is updated"""
 
 ABI = 20
diff --git a/third_party/waf/waflib/Scripting.py b/third_party/waf/waflib/Scripting.py
index ae17a8b4503..68dccf29ce0 100644
--- a/third_party/waf/waflib/Scripting.py
+++ b/third_party/waf/waflib/Scripting.py
@@ -332,7 +332,12 @@ def distclean(ctx):
 		else:
 			remove_and_log(env.out_dir, shutil.rmtree)
 
-		for k in (env.out_dir, env.top_dir, env.run_dir):
+		env_dirs = [env.out_dir]
+		if not ctx.options.no_lock_in_top:
+			env_dirs.append(env.top_dir)
+		if not ctx.options.no_lock_in_run:
+			env_dirs.append(env.run_dir)
+		for k in env_dirs:
 			p = os.path.join(k, Options.lockfile)
 			remove_and_log(p, os.remove)
 
diff --git a/third_party/waf/waflib/TaskGen.py b/third_party/waf/waflib/TaskGen.py
index 532b7d5cdb4..f8f92bd57c1 100644
--- a/third_party/waf/waflib/TaskGen.py
+++ b/third_party/waf/waflib/TaskGen.py
@@ -905,7 +905,7 @@ def process_subst(self):
 		# paranoid safety measure for the general case foo.in->foo.h with ambiguous dependencies
 		for xt in HEADER_EXTS:
 			if b.name.endswith(xt):
-				tsk.ext_in = tsk.ext_in + ['.h']
+				tsk.ext_out = tsk.ext_out + ['.h']
 				break
 
 		inst_to = getattr(self, 'install_path', None)
diff --git a/third_party/waf/waflib/Tools/asm.py b/third_party/waf/waflib/Tools/asm.py
index b6f26fb3df3..a57e83bb5ec 100644
--- a/third_party/waf/waflib/Tools/asm.py
+++ b/third_party/waf/waflib/Tools/asm.py
@@ -34,9 +34,22 @@ Support for pure asm programs and libraries should also work::
 			target = 'asmtest')
 """
 
-from waflib import Task
+import re
+from waflib import Errors, Logs, Task
 from waflib.Tools.ccroot import link_task, stlink_task
 from waflib.TaskGen import extension
+from waflib.Tools import c_preproc
+
+re_lines = re.compile(
+	'^[ \t]*(?:%)[ \t]*(ifdef|ifndef|if|else|elif|endif|include|import|define|undef)[ \t]*(.*)\r*$',
+	re.IGNORECASE | re.MULTILINE)
+
+class asm_parser(c_preproc.c_parser):
+	def filter_comments(self, node):
+		code = node.read()
+		code = c_preproc.re_nl.sub('', code)
+		code = c_preproc.re_cpp.sub(c_preproc.repl, code)
+		return re_lines.findall(code)
 
 class asm(Task.Task):
 	"""
@@ -45,6 +58,28 @@ class asm(Task.Task):
 	color = 'BLUE'
 	run_str = '${AS} ${ASFLAGS} ${ASMPATH_ST:INCPATHS} ${DEFINES_ST:DEFINES} ${AS_SRC_F}${SRC} ${AS_TGT_F}${TGT}'
 
+	def scan(self):
+		if self.env.ASM_NAME == 'gas':
+			return c_preproc.scan(self)
+			Logs.warn('There is no dependency scanner for Nasm!')
+			return  [[], []]
+		elif self.env.ASM_NAME == 'nasm':
+			Logs.warn('The Nasm dependency scanner is incomplete!')
+
+		try:
+			incn = self.generator.includes_nodes
+		except AttributeError:
+			raise Errors.WafError('%r is missing the "asm" feature' % self.generator)
+
+		if c_preproc.go_absolute:
+			nodepaths = incn
+		else:
+			nodepaths = [x for x in incn if x.is_child_of(x.ctx.srcnode) or x.is_child_of(x.ctx.bldnode)]
+
+		tmp = asm_parser(nodepaths)
+		tmp.start(self.inputs[0], self.env)
+		return (tmp.nodes, tmp.names)
+
 @extension('.s', '.S', '.asm', '.ASM', '.spp', '.SPP')
 def asm_hook(self, node):
 	"""
diff --git a/third_party/waf/waflib/Tools/c_aliases.py b/third_party/waf/waflib/Tools/c_aliases.py
index c9d53692e8f..985e048bdb7 100644
--- a/third_party/waf/waflib/Tools/c_aliases.py
+++ b/third_party/waf/waflib/Tools/c_aliases.py
@@ -47,10 +47,12 @@ def sniff_features(**kw):
 		if x in exts:
 			feats.append('cxx')
 			break
-
 	if 'c' in exts or 'vala' in exts or 'gs' in exts:
 		feats.append('c')
 
+	if 's' in exts or 'S' in exts:
+		feats.append('asm')
+
 	for x in 'f f90 F F90 for FOR'.split():
 		if x in exts:
 			feats.append('fc')
@@ -66,7 +68,7 @@ def sniff_features(**kw):
 	if typ in ('program', 'shlib', 'stlib'):
 		will_link = False
 		for x in feats:
-			if x in ('cxx', 'd', 'fc', 'c'):
+			if x in ('cxx', 'd', 'fc', 'c', 'asm'):
 				feats.append(x + typ)
 				will_link = True
 		if not will_link and not kw.get('features', []):
diff --git a/third_party/waf/waflib/Tools/c_config.py b/third_party/waf/waflib/Tools/c_config.py
index d546be95614..80580cc9fcb 100644
--- a/third_party/waf/waflib/Tools/c_config.py
+++ b/third_party/waf/waflib/Tools/c_config.py
@@ -659,20 +659,21 @@ class test_exec(Task.Task):
 	"""
 	color = 'PINK'
 	def run(self):
+		cmd = [self.inputs[0].abspath()] + getattr(self.generator, 'test_args', [])
 		if getattr(self.generator, 'rpath', None):
 			if getattr(self.generator, 'define_ret', False):
-				self.generator.bld.retval = self.generator.bld.cmd_and_log([self.inputs[0].abspath()])
+				self.generator.bld.retval = self.generator.bld.cmd_and_log(cmd)
 			else:
-				self.generator.bld.retval = self.generator.bld.exec_command([self.inputs[0].abspath()])
+				self.generator.bld.retval = self.generator.bld.exec_command(cmd)
 		else:
 			env = self.env.env or {}
 			env.update(dict(os.environ))
 			for var in ('LD_LIBRARY_PATH', 'DYLD_LIBRARY_PATH', 'PATH'):
 				env[var] = self.inputs[0].parent.abspath() + os.path.pathsep + env.get(var, '')
 			if getattr(self.generator, 'define_ret', False):
-				self.generator.bld.retval = self.generator.bld.cmd_and_log([self.inputs[0].abspath()], env=env)
+				self.generator.bld.retval = self.generator.bld.cmd_and_log(cmd, env=env)
 			else:
-				self.generator.bld.retval = self.generator.bld.exec_command([self.inputs[0].abspath()], env=env)
+				self.generator.bld.retval = self.generator.bld.exec_command(cmd, env=env)
 
 @feature('test_exec')
 @after_method('apply_link')
diff --git a/third_party/waf/waflib/Tools/c_tests.py b/third_party/waf/waflib/Tools/c_tests.py
index f858df5763c..7a4094f2450 100644
--- a/third_party/waf/waflib/Tools/c_tests.py
+++ b/third_party/waf/waflib/Tools/c_tests.py
@@ -224,6 +224,7 @@ def check_endianness(self):
 	def check_msg(self):
 		return tmp[0]
 	self.check(fragment=ENDIAN_FRAGMENT, features='c grep_for_endianness',
-		msg='Checking for endianness', define='ENDIANNESS', tmp=tmp, okmsg=check_msg)
+		msg='Checking for endianness', define='ENDIANNESS', tmp=tmp,
+		okmsg=check_msg, confcache=None)
 	return tmp[0]
 
diff --git a/third_party/waf/waflib/Tools/gas.py b/third_party/waf/waflib/Tools/gas.py
index 77afed7038f..4a8745afd7e 100644
--- a/third_party/waf/waflib/Tools/gas.py
+++ b/third_party/waf/waflib/Tools/gas.py
@@ -16,3 +16,4 @@ def configure(conf):
 	conf.env.ASLNK_TGT_F = ['-o']
 	conf.find_ar()
 	conf.load('asm')
+	conf.env.ASM_NAME = 'gas'
diff --git a/third_party/waf/waflib/Tools/javaw.py b/third_party/waf/waflib/Tools/javaw.py
index fd1cf469abf..ceb08c28c87 100644
--- a/third_party/waf/waflib/Tools/javaw.py
+++ b/third_party/waf/waflib/Tools/javaw.py
@@ -246,7 +246,7 @@ def use_javac_files(self):
 				self.javac_task.dep_nodes.extend(tg.jar_task.outputs)
 			else:
 				if hasattr(tg, 'outdir'):
-					base_node = tg.outdir.abspath()
+					base_node = tg.outdir
 				else:
 					base_node = tg.path.get_bld()
 
diff --git a/third_party/waf/waflib/Tools/nasm.py b/third_party/waf/waflib/Tools/nasm.py
index 411d5826b5d..9c51c18de18 100644
--- a/third_party/waf/waflib/Tools/nasm.py
+++ b/third_party/waf/waflib/Tools/nasm.py
@@ -24,3 +24,8 @@ def configure(conf):
 	conf.env.ASLNK_TGT_F = ['-o']
 	conf.load('asm')
 	conf.env.ASMPATH_ST = '-I%s' + os.sep
+	txt = conf.cmd_and_log(conf.env.AS + ['--version'])
+	if 'yasm' in txt.lower():
+		conf.env.ASM_NAME = 'yasm'
+	else:
+		conf.env.ASM_NAME = 'nasm'
diff --git a/third_party/waf/waflib/Tools/python.py b/third_party/waf/waflib/Tools/python.py
index 63a8917d7c1..7c45a76ffd2 100644
--- a/third_party/waf/waflib/Tools/python.py
+++ b/third_party/waf/waflib/Tools/python.py
@@ -79,14 +79,19 @@ def process_py(self, node):
 	"""
 	Add signature of .py file, so it will be byte-compiled when necessary
 	"""
-	assert(hasattr(self, 'install_path')), 'add features="py"'
+	assert(hasattr(self, 'install_path')), 'add features="py" for target "%s" in "%s/wscript".' % (self.target, self.path.nice_path())
+	self.install_from = getattr(self, 'install_from', None)
+	relative_trick = getattr(self, 'relative_trick', True)
+	if self.install_from:
+		assert isinstance(self.install_from, Node.Node), \
+		'add features="py" for target "%s" in "%s/wscript" (%s).' % (self.target, self.path.nice_path(), type(self.install_from))
 
 	# where to install the python file
 	if self.install_path:
 		if self.install_from:
-			self.add_install_files(install_to=self.install_path, install_from=node, cwd=self.install_from, relative_trick=True)
+			self.add_install_files(install_to=self.install_path, install_from=node, cwd=self.install_from, relative_trick=relative_trick)
 		else:
-			self.add_install_files(install_to=self.install_path, install_from=node, relative_trick=True)
+			self.add_install_files(install_to=self.install_path, install_from=node, relative_trick=relative_trick)
 
 	lst = []
 	if self.env.PYC:
@@ -96,9 +101,11 @@ def process_py(self, node):
 
 	if self.install_path:
 		if self.install_from:
-			pyd = Utils.subst_vars("%s/%s" % (self.install_path, node.path_from(self.install_from)), self.env)
+			target_dir = node.path_from(self.install_from) if relative_trick else node.name
+			pyd = Utils.subst_vars("%s/%s" % (self.install_path, target_dir), self.env)
 		else:
-			pyd = Utils.subst_vars("%s/%s" % (self.install_path, node.path_from(self.path)), self.env)
+			target_dir = node.path_from(self.path) if relative_trick else node.name
+			pyd = Utils.subst_vars("%s/%s" % (self.install_path, target_dir), self.env)
 	else:
 		pyd = node.abspath()
 
@@ -115,7 +122,7 @@ def process_py(self, node):
 		tsk.pyd = pyd
 
 		if self.install_path:
-			self.add_install_files(install_to=os.path.dirname(pyd), install_from=pyobj, cwd=node.parent.get_bld(), relative_trick=True)
+			self.add_install_files(install_to=os.path.dirname(pyd), install_from=pyobj, cwd=node.parent.get_bld(), relative_trick=relative_trick)
 
 class pyc(Task.Task):
 	"""
@@ -433,11 +440,11 @@ def check_python_headers(conf, features='pyembed pyext'):
 
 	# Code using the Python API needs to be compiled with -fno-strict-aliasing
 	if env.CC_NAME == 'gcc':
-		env.append_value('CFLAGS_PYEMBED', ['-fno-strict-aliasing'])
-		env.append_value('CFLAGS_PYEXT', ['-fno-strict-aliasing'])
+		env.append_unique('CFLAGS_PYEMBED', ['-fno-strict-aliasing'])
+		env.append_unique('CFLAGS_PYEXT', ['-fno-strict-aliasing'])
 	if env.CXX_NAME == 'gcc':
-		env.append_value('CXXFLAGS_PYEMBED', ['-fno-strict-aliasing'])
-		env.append_value('CXXFLAGS_PYEXT', ['-fno-strict-aliasing'])
+		env.append_unique('CXXFLAGS_PYEMBED', ['-fno-strict-aliasing'])
+		env.append_unique('CXXFLAGS_PYEXT', ['-fno-strict-aliasing'])
 
 	if env.CC_NAME == "msvc":
 		from distutils.msvccompiler import MSVCCompiler
diff --git a/third_party/waf/waflib/extras/doxygen.py b/third_party/waf/waflib/extras/doxygen.py
index 423d8455025..20cd9e1a852 100644
--- a/third_party/waf/waflib/extras/doxygen.py
+++ b/third_party/waf/waflib/extras/doxygen.py
@@ -85,6 +85,12 @@ class doxygen(Task.Task):
 		if not getattr(self, 'pars', None):
 			txt = self.inputs[0].read()
 			self.pars = parse_doxy(txt)
+
+			# Override with any parameters passed to the task generator
+			if getattr(self.generator, 'pars', None):
+				for k, v in self.generator.pars.items():
+					self.pars[k] = v
+
 			if self.pars.get('OUTPUT_DIRECTORY'):
 				# Use the path parsed from the Doxyfile as an absolute path
 				output_node = self.inputs[0].parent.get_bld().make_node(self.pars['OUTPUT_DIRECTORY'])
@@ -94,11 +100,6 @@ class doxygen(Task.Task):
 			output_node.mkdir()
 			self.pars['OUTPUT_DIRECTORY'] = output_node.abspath()
 
-			# Override with any parameters passed to the task generator
-			if getattr(self.generator, 'pars', None):
-				for k, v in self.generator.pars.items():
-					self.pars[k] = v
-
 			self.doxy_inputs = getattr(self, 'doxy_inputs', [])
 			if not self.pars.get('INPUT'):
 				self.doxy_inputs.append(self.inputs[0].parent)
diff --git a/third_party/waf/waflib/extras/fast_partial.py b/third_party/waf/waflib/extras/fast_partial.py
index 71b8318eecb..90a94723bb8 100644
--- a/third_party/waf/waflib/extras/fast_partial.py
+++ b/third_party/waf/waflib/extras/fast_partial.py
@@ -18,6 +18,7 @@ Usage::
 		opt.load('fast_partial')
 
 Assumptions:
+* Start with a clean build (run "waf distclean" after enabling)
 * Mostly for C/C++/Fortran targets with link tasks (object-only targets are not handled)
   try it in the folder generated by utils/genbench.py
 * For full project builds: no --targets and no pruning from subfolders
@@ -131,12 +132,18 @@ class bld_proxy(object):
 			data[x] = getattr(self, x)
 		db = os.path.join(self.variant_dir, Context.DBFILE + self.store_key)
 
-		try:
-			waflib.Node.pickle_lock.acquire()
+		with waflib.Node.pickle_lock:
 			waflib.Node.Nod3 = self.node_class
-			x = Build.cPickle.dumps(data, Build.PROTOCOL)
-		finally:
-			waflib.Node.pickle_lock.release()
+			try:
+				x = Build.cPickle.dumps(data, Build.PROTOCOL)
+			except Build.cPickle.PicklingError:
+				root = data['root']
+				for node_deps in data['node_deps'].values():
+					for idx, node in enumerate(node_deps):
+						# there may be more cross-context Node objects to fix,
+						# but this should be the main source
+						node_deps[idx] = root.find_node(node.abspath())
+				x = Build.cPickle.dumps(data, Build.PROTOCOL)
 
 		Logs.debug('rev_use: storing %s', db)
 		Utils.writef(db + '.tmp', x, m='wb')
@@ -393,12 +400,17 @@ def is_stale(self):
 		Logs.debug('rev_use: must post %r because this is a clean build')
 		return True
 
-	# 3. check if the configuration changed
-	if os.stat(self.bld.bldnode.find_node('c4che/build.config.py').abspath()).st_mtime > dbstat:
+	# 3.a check if the configuration exists
+	cache_node = self.bld.bldnode.find_node('c4che/build.config.py')
+	if not cache_node:
+		return True
+
+	# 3.b check if the configuration changed
+	if os.stat(cache_node.abspath()).st_mtime > dbstat:
 		Logs.debug('rev_use: must post %r because the configuration has changed', self.name)
 		return True
 
-	# 3.a any tstamp data?
+	# 3.c any tstamp data?
 	try:
 		f_deps = self.bld.f_deps
 	except AttributeError:
diff --git a/third_party/waf/waflib/extras/genpybind.py b/third_party/waf/waflib/extras/genpybind.py
new file mode 100644
index 00000000000..ac206ee8a8b
--- /dev/null
+++ b/third_party/waf/waflib/extras/genpybind.py
@@ -0,0 +1,194 @@
+import os
+import pipes
+import subprocess
+import sys
+
+from waflib import Logs, Task, Context
+from waflib.Tools.c_preproc import scan as scan_impl
+# ^-- Note: waflib.extras.gccdeps.scan does not work for us,
+# due to its current implementation:
+# The -MD flag is injected into the {C,CXX}FLAGS environment variable and
+# dependencies are read out in a separate step after compiling by reading
+# the .d file saved alongside the object file.
+# As the genpybind task refers to a header file that is never compiled itself,
+# gccdeps will not be able to extract the list of dependencies.
+
+from waflib.TaskGen import feature, before_method
+
+
+def join_args(args):
+    return " ".join(pipes.quote(arg) for arg in args)
+
+
+def configure(cfg):
+    cfg.load("compiler_cxx")
+    cfg.load("python")
+    cfg.check_python_version(minver=(2, 7))
+    if not cfg.env.LLVM_CONFIG:
+        cfg.find_program("llvm-config", var="LLVM_CONFIG")
+    if not cfg.env.GENPYBIND:
+        cfg.find_program("genpybind", var="GENPYBIND")
+
+    # find clang reasource dir for builtin headers
+    cfg.env.GENPYBIND_RESOURCE_DIR = os.path.join(
+            cfg.cmd_and_log(cfg.env.LLVM_CONFIG + ["--libdir"]).strip(),
+            "clang",
+            cfg.cmd_and_log(cfg.env.LLVM_CONFIG + ["--version"]).strip())
+    if os.path.exists(cfg.env.GENPYBIND_RESOURCE_DIR):
+        cfg.msg("Checking clang resource dir", cfg.env.GENPYBIND_RESOURCE_DIR)
+    else:
+        cfg.fatal("Clang resource dir not found")
+
+
+@feature("genpybind")
+@before_method("process_source")
+def generate_genpybind_source(self):
+    """
+    Run genpybind on the headers provided in `source` and compile/link the
+    generated code instead.  This works by generating the code on the fly and
+    swapping the source node before `process_source` is run.
+    """
+    # name of module defaults to name of target
+    module = getattr(self, "module", self.target)
+
+    # create temporary source file in build directory to hold generated code
+    out = "genpybind-%s.%d.cpp" % (module, self.idx)
+    out = self.path.get_bld().find_or_declare(out)
+
+    task = self.create_task("genpybind", self.to_nodes(self.source), out)
+    # used to detect whether CFLAGS or CXXFLAGS should be passed to genpybind
+    task.features = self.features
+    task.module = module
+    # can be used to select definitions to include in the current module
+    # (when header files are shared by more than one module)
+    task.genpybind_tags = self.to_list(getattr(self, "genpybind_tags", []))
+    # additional include directories
+    task.includes = self.to_list(getattr(self, "includes", []))
+    task.genpybind = self.env.GENPYBIND
+
+    # Tell waf to compile/link the generated code instead of the headers
+    # originally passed-in via the `source` parameter. (see `process_source`)
+    self.source = [out]
+
+
+class genpybind(Task.Task): # pylint: disable=invalid-name
+    """
+    Runs genpybind on headers provided as input to this task.
+    Generated code will be written to the first (and only) output node.
+    """
+    quiet = True
+    color = "PINK"
+    scan = scan_impl
+
+    @staticmethod
+    def keyword():
+        return "Analyzing"
+
+    def run(self):
+        if not self.inputs:
+            return
+
+        args = self.find_genpybind() + self._arguments(
+                resource_dir=self.env.GENPYBIND_RESOURCE_DIR)
+
+        output = self.run_genpybind(args)
+
+        # For debugging / log output
+        pasteable_command = join_args(args)
+
+        # write generated code to file in build directory
+        # (will be compiled during process_source stage)
+        (output_node,) = self.outputs
+        output_node.write("// {}\n{}\n".format(
+            pasteable_command.replace("\n", "\n// "), output))
+
+    def find_genpybind(self):
+        return self.genpybind
+
+    def run_genpybind(self, args):
+        bld = self.generator.bld
+
+        kwargs = dict(cwd=bld.variant_dir)
+        if hasattr(bld, "log_command"):
+            bld.log_command(args, kwargs)
+        else:
+            Logs.debug("runner: {!r}".format(args))
+        proc = subprocess.Popen(
+            args, stdout=subprocess.PIPE, stderr=subprocess.PIPE, **kwargs)
+        stdout, stderr = proc.communicate()
+
+        if not isinstance(stdout, str):
+            stdout = stdout.decode(sys.stdout.encoding, errors="replace")
+        if not isinstance(stderr, str):
+            stderr = stderr.decode(sys.stderr.encoding, errors="replace")
+
+        if proc.returncode != 0:
+            bld.fatal(
+                "genpybind returned {code} during the following call:"
+                "\n{command}\n\n{stdout}\n\n{stderr}".format(
+                    code=proc.returncode,
+                    command=join_args(args),
+                    stdout=stdout,
+                    stderr=stderr,
+                ))
+
+        if stderr.strip():
+            Logs.debug("non-fatal warnings during genpybind run:\n{}".format(stderr))
+
+        return stdout
+
+    def _include_paths(self):
+        return self.generator.to_incnodes(self.includes + self.env.INCLUDES)
+
+    def _inputs_as_relative_includes(self):
+        include_paths = self._include_paths()
+        relative_includes = []
+        for node in self.inputs:
+            for inc in include_paths:
+                if node.is_child_of(inc):
+                    relative_includes.append(node.path_from(inc))
+                    break
+            else:
+                self.generator.bld.fatal("could not resolve {}".format(node))
+        return relative_includes
+
+    def _arguments(self, genpybind_parse=None, resource_dir=None):
+        args = []
+        relative_includes = self._inputs_as_relative_includes()
+        is_cxx = "cxx" in self.features
+
+        # options for genpybind
+        args.extend(["--genpybind-module", self.module])
+        if self.genpybind_tags:
+            args.extend(["--genpybind-tag"] + self.genpybind_tags)
+        if relative_includes:
+            args.extend(["--genpybind-include"] + relative_includes)
+        if genpybind_parse:
+            args.extend(["--genpybind-parse", genpybind_parse])
+
+        args.append("--")
+
+        # headers to be processed by genpybind
+        args.extend(node.abspath() for node in self.inputs)
+
+        args.append("--")
+
+        # options for clang/genpybind-parse
+        args.append("-D__GENPYBIND__")
+        args.append("-xc++" if is_cxx else "-xc")
+        has_std_argument = False
+        for flag in self.env["CXXFLAGS" if is_cxx else "CFLAGS"]:
+            flag = flag.replace("-std=gnu", "-std=c")
+            if flag.startswith("-std=c"):
+                has_std_argument = True
+            args.append(flag)
+        if not has_std_argument:
+            args.append("-std=c++14")
+        args.extend("-I{}".format(n.abspath()) for n in self._include_paths())
+        args.extend("-D{}".format(p) for p in self.env.DEFINES)
+
+        # point to clang resource dir, if specified
+        if resource_dir:
+            args.append("-resource-dir={}".format(resource_dir))
+
+        return args
diff --git a/third_party/waf/waflib/extras/local_rpath.py b/third_party/waf/waflib/extras/local_rpath.py
index b2507e17a10..e3923d9b9d4 100644
--- a/third_party/waf/waflib/extras/local_rpath.py
+++ b/third_party/waf/waflib/extras/local_rpath.py
@@ -2,18 +2,20 @@
 # encoding: utf-8
 # Thomas Nagy, 2011 (ita)
 
+import copy
 from waflib.TaskGen import after_method, feature
 
 @after_method('propagate_uselib_vars')
 @feature('cprogram', 'cshlib', 'cxxprogram', 'cxxshlib', 'fcprogram', 'fcshlib')
 def add_rpath_stuff(self):
-	all = self.to_list(getattr(self, 'use', []))
+	all = copy.copy(self.to_list(getattr(self, 'use', [])))
 	while all:
 		name = all.pop()
 		try:
 			tg = self.bld.get_tgen_by_name(name)
 		except:
 			continue
-		self.env.append_value('RPATH', tg.link_task.outputs[0].parent.abspath())
-		all.extend(self.to_list(getattr(tg, 'use', [])))
+		if hasattr(tg, 'link_task'):
+			self.env.append_value('RPATH', tg.link_task.outputs[0].parent.abspath())
+			all.extend(self.to_list(getattr(tg, 'use', [])))
 
diff --git a/third_party/waf/waflib/extras/objcopy.py b/third_party/waf/waflib/extras/objcopy.py
index 82d8359ecf7..bb7ca6ef224 100644
--- a/third_party/waf/waflib/extras/objcopy.py
+++ b/third_party/waf/waflib/extras/objcopy.py
@@ -15,7 +15,7 @@ objcopy_flags		  Additional flags passed to objcopy.
 """
 
 from waflib.Utils import def_attrs
-from waflib import Task
+from waflib import Task, Options
 from waflib.TaskGen import feature, after_method
 
 class objcopy(Task.Task):
@@ -46,5 +46,8 @@ def map_objcopy(self):
 		self.add_install_files(install_to=self.objcopy_install_path, install_from=task.outputs[0])
 
 def configure(ctx):
-	ctx.find_program('objcopy', var='OBJCOPY', mandatory=True)
-
+	program_name = 'objcopy'
+	prefix = getattr(Options.options, 'cross_prefix', None)
+	if prefix:
+		program_name = '{}-{}'.format(prefix, program_name)
+	ctx.find_program(program_name, var='OBJCOPY', mandatory=True)
-- 
2.20.1