From c2b0355b0de23f6ec83b5fa5be038bcce208e26f Mon Sep 17 00:00:00 2001
From: David Robillard <d@drobilla.net>
Date: Sat, 15 Sep 2018 14:51:03 +0200
Subject: Squashed 'waflib/' content from commit 982416b

git-subtree-dir: waflib
git-subtree-split: 982416b8a6c6728e200243e1be3ab60435c08830
---
 extras/slow_qt4.py | 96 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 extras/slow_qt4.py

(limited to 'extras/slow_qt4.py')

diff --git a/extras/slow_qt4.py b/extras/slow_qt4.py
new file mode 100644
index 0000000..ec7880b
--- /dev/null
+++ b/extras/slow_qt4.py
@@ -0,0 +1,96 @@
+#! /usr/bin/env python
+# Thomas Nagy, 2011 (ita)
+
+"""
+Create _moc.cpp files
+
+The builds are 30-40% faster when .moc files are included,
+you should NOT use this tool. If you really
+really want it:
+
+def configure(conf):
+	conf.load('compiler_cxx qt4')
+	conf.load('slow_qt4')
+
+See playground/slow_qt/wscript for a complete example.
+"""
+
+from waflib.TaskGen import extension
+from waflib import Task
+import waflib.Tools.qt4
+import waflib.Tools.cxx
+
+@extension(*waflib.Tools.qt4.EXT_QT4)
+def cxx_hook(self, node):
+	return self.create_compiled_task('cxx_qt', node)
+
+class cxx_qt(Task.classes['cxx']):
+	def runnable_status(self):
+		ret = Task.classes['cxx'].runnable_status(self)
+		if ret != Task.ASK_LATER and not getattr(self, 'moc_done', None):
+
+			try:
+				cache = self.generator.moc_cache
+			except AttributeError:
+				cache = self.generator.moc_cache = {}
+
+			deps = self.generator.bld.node_deps[self.uid()]
+			for x in [self.inputs[0]] + deps:
+				if x.read().find('Q_OBJECT') > 0:
+
+					# process "foo.h -> foo.moc" only if "foo.cpp" is in the sources for the current task generator
+					# this code will work because it is in the main thread (runnable_status)
+					if x.name.rfind('.') > -1: # a .h file...
+						name = x.name[:x.name.rfind('.')]
+						for tsk in self.generator.compiled_tasks:
+							if tsk.inputs and tsk.inputs[0].name.startswith(name):
+								break
+						else:
+							# no corresponding file, continue
+							continue
+
+					# the file foo.cpp could be compiled for a static and a shared library - hence the %number in the name
+					cxx_node = x.parent.get_bld().make_node(x.name.replace('.', '_') + '_%d_moc.cpp' % self.generator.idx)
+					if cxx_node in cache:
+						continue
+					cache[cxx_node] = self
+
+					tsk = Task.classes['moc'](env=self.env, generator=self.generator)
+					tsk.set_inputs(x)
+					tsk.set_outputs(cxx_node)
+
+					if x.name.endswith('.cpp'):
+						# moc is trying to be too smart but it is too dumb:
+						# why forcing the #include when Q_OBJECT is in the cpp file?
+						gen = self.generator.bld.producer
+						gen.outstanding.append(tsk)
+						gen.total += 1
+						self.set_run_after(tsk)
+					else:
+						cxxtsk = Task.classes['cxx'](env=self.env, generator=self.generator)
+						cxxtsk.set_inputs(tsk.outputs)
+						cxxtsk.set_outputs(cxx_node.change_ext('.o'))
+						cxxtsk.set_run_after(tsk)
+
+						try:
+							self.more_tasks.extend([tsk, cxxtsk])
+						except AttributeError:
+							self.more_tasks = [tsk, cxxtsk]
+
+						try:
+							link = self.generator.link_task
+						except AttributeError:
+							pass
+						else:
+							link.set_run_after(cxxtsk)
+							link.inputs.extend(cxxtsk.outputs)
+							link.inputs.sort(key=lambda x: x.abspath())
+
+			self.moc_done = True
+
+		for t in self.run_after:
+			if not t.hasrun:
+				return Task.ASK_LATER
+
+		return ret
+
-- 
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