1 files changed, 173 insertions, 0 deletions
diff --git a/extras/batched_cc.py b/extras/batched_cc.py
new file mode 100644
index 00000000..aad28722
--- /dev/null
+++ b/extras/batched_cc.py
@@ -0,0 +1,173 @@
+#!/usr/bin/env python
+# encoding: utf-8
+# Thomas Nagy, 2006-2015 (ita)
+
+"""
+Instead of compiling object files one by one, c/c++ compilers are often able to compile at once:
+cc -c ../file1.c ../file2.c ../file3.c
+
+Files are output on the directory where the compiler is called, and dependencies are more difficult
+to track (do not run the command on all source files if only one file changes)
+As such, we do as if the files were compiled one by one, but no command is actually run:
+replace each cc/cpp Task by a TaskSlave. A new task called TaskMaster collects the
+signatures from each slave and finds out the command-line to run.
+
+Just import this module to start using it:
+def build(bld):
+	bld.load('batched_cc')
+
+Note that this is provided as an example, unity builds are recommended
+for best performance results (fewer tasks and fewer jobs to execute).
+See waflib/extras/unity.py.
+"""
+
+from waflib import Task, Utils
+from waflib.TaskGen import extension, feature, after_method
+from waflib.Tools import c, cxx
+
+MAX_BATCH = 50
+
+c_str = '${CC} ${ARCH_ST:ARCH} ${CFLAGS} ${FRAMEWORKPATH_ST:FRAMEWORKPATH} ${tsk.batch_incpaths()} ${DEFINES_ST:DEFINES} -c ${SRCLST} ${CXX_TGT_F_BATCHED} ${CPPFLAGS}'
+c_fun, _ = Task.compile_fun_noshell(c_str)
+
+cxx_str = '${CXX} ${ARCH_ST:ARCH} ${CXXFLAGS} ${FRAMEWORKPATH_ST:FRAMEWORKPATH} ${tsk.batch_incpaths()} ${DEFINES_ST:DEFINES} -c ${SRCLST} ${CXX_TGT_F_BATCHED} ${CPPFLAGS}'
+cxx_fun, _ = Task.compile_fun_noshell(cxx_str)
+
+count = 70000
+class batch(Task.Task):
+	color = 'PINK'
+
+	after = ['c', 'cxx']
+	before = ['cprogram', 'cshlib', 'cstlib', 'cxxprogram', 'cxxshlib', 'cxxstlib']
+
+	def uid(self):
+		return Utils.h_list([Task.Task.uid(self), self.generator.idx, self.generator.path.abspath(), self.generator.target])
+
+	def __str__(self):
+		return 'Batch compilation for %d slaves' % len(self.slaves)
+
+	def __init__(self, *k, **kw):
+		Task.Task.__init__(self, *k, **kw)
+		self.slaves = []
+		self.inputs = []
+		self.hasrun = 0
+
+		global count
+		count += 1
+		self.idx = count
+
+	def add_slave(self, slave):
+		self.slaves.append(slave)
+		self.set_run_after(slave)
+
+	def runnable_status(self):
+		for t in self.run_after:
+			if not t.hasrun:
+				return Task.ASK_LATER
+
+		for t in self.slaves:
+			#if t.executed:
+			if t.hasrun != Task.SKIPPED:
+				return Task.RUN_ME
+
+		return Task.SKIP_ME
+
+	def get_cwd(self):
+		return self.slaves[0].outputs[0].parent
+
+	def batch_incpaths(self):
+		st = self.env.CPPPATH_ST
+		return [st % node.abspath() for node in self.generator.includes_nodes]
+
+	def run(self):
+		self.outputs = []
+
+		srclst = []
+		slaves = []
+		for t in self.slaves:
+			if t.hasrun != Task.SKIPPED:
+				slaves.append(t)
+				srclst.append(t.inputs[0].abspath())
+
+		self.env.SRCLST = srclst
+
+		if self.slaves[0].__class__.__name__ == 'c':
+			ret = c_fun(self)
+		else:
+			ret = cxx_fun(self)
+
+		if ret:
+			return ret
+
+		for t in slaves:
+			t.old_post_run()
+
+def hook(cls_type):
+	def n_hook(self, node):
+
+		ext = '.obj' if self.env.CC_NAME == 'msvc' else '.o'
+		name = node.name
+		k = name.rfind('.')
+		if k >= 0:
+			basename = name[:k] + ext
+		else:
+			basename = name + ext
+
+		outdir = node.parent.get_bld().make_node('%d' % self.idx)
+		outdir.mkdir()
+		out = outdir.find_or_declare(basename)
+
+		task = self.create_task(cls_type, node, out)
+
+		try:
+			self.compiled_tasks.append(task)
+		except AttributeError:
+			self.compiled_tasks = [task]
+
+		if not getattr(self, 'masters', None):
+			self.masters = {}
+			self.allmasters = []
+
+		def fix_path(tsk):
+			if self.env.CC_NAME == 'msvc':
+				tsk.env.append_unique('CXX_TGT_F_BATCHED', '/Fo%s\\' % outdir.abspath())
+
+		if not node.parent in self.masters:
+			m = self.masters[node.parent] = self.master = self.create_task('batch')
+			fix_path(m)
+			self.allmasters.append(m)
+		else:
+			m = self.masters[node.parent]
+			if len(m.slaves) > MAX_BATCH:
+				m = self.masters[node.parent] = self.master = self.create_task('batch')
+				fix_path(m)
+				self.allmasters.append(m)
+		m.add_slave(task)
+		return task
+	return n_hook
+
+extension('.c')(hook('c'))
+extension('.cpp','.cc','.cxx','.C','.c++')(hook('cxx'))
+
+@feature('cprogram', 'cshlib', 'cstaticlib', 'cxxprogram', 'cxxshlib', 'cxxstlib')
+@after_method('apply_link')
+def link_after_masters(self):
+	if getattr(self, 'allmasters', None):
+		for m in self.allmasters:
+			self.link_task.set_run_after(m)
+
+# Modify the c and cxx task classes - in theory it would be best to
+# create subclasses and to re-map the c/c++ extensions
+for x in ('c', 'cxx'):
+	t = Task.classes[x]
+	def run(self):
+		pass
+
+	def post_run(self):
+		pass
+
+	setattr(t, 'oldrun', getattr(t, 'run', None))
+	setattr(t, 'run', run)
+	setattr(t, 'old_post_run', t.post_run)
+	setattr(t, 'post_run', post_run)
+