2
0
mirror of https://gitlab.com/ita1024/waf.git synced 2024-12-23 09:45:13 +01:00
waf/playground/dynamic_recursive_tasks/wscript
2011-09-10 11:13:51 +02:00

79 lines
2.0 KiB
Python

#! /usr/bin/env python
# encoding: utf-8
# Thomas Nagy, 2010 (ita)
VERSION='0.0.1'
APPNAME='crazy_test'
top = '.'
out = 'build'
def options(opt):
opt.load('compiler_cxx')
def configure(conf):
conf.load('compiler_cxx')
def build(bld):
bld.program(source='main.cpp', target='app')
"""
Only main.cpp is added to the program, then by looking at the include files,
a <file.h> file is found. If a corresponding <file.cpp> exists,
then a new c++ task is created to compile that file and to add it to the
program (modify the link task).
The idea is to change the method runnable_status of the task. A more correct but less obvious
approach would be the creation of a specific c++ subclass, and using another
extension mapping function (@extension).
"""
from waflib.Task import ASK_LATER
from waflib.Tools.cxx import cxx
def runnable_status(self):
ret = super(cxx, self).runnable_status()
self.more_tasks = []
# use a cache to avoid creating the same tasks
# for example, truc.cpp might be compiled twice
try:
shared = self.generator.bld.shared_tasks
except AttributeError:
shared = self.generator.bld.shared_tasks = {}
if ret != ASK_LATER:
for x in self.generator.bld.node_deps[self.uid()]:
node = x.parent.get_src().find_resource(x.name.replace('.h', '.cpp'))
if node:
try:
tsk = shared[node]
except:
tsk = shared[node] = self.generator.cxx_hook(node)
self.more_tasks.append(tsk)
# add the node created to the link task outputs
try:
link = self.generator.link_task
except AttributeError:
pass
else:
if not tsk.outputs[0] in link.inputs:
link.inputs.append(tsk.outputs[0])
link.set_run_after(tsk)
# any change in the order of the input nodes may cause a recompilation
link.inputs.sort(key=lambda x: x.abspath())
# if you want to modify some flags
# you *must* have the task recompute the signature
self.env.append_value('CXXFLAGS', '-O2')
delattr(self, 'cache_sig')
return super(cxx, self).runnable_status()
return ret
cxx.runnable_status = runnable_status