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#!/usr/bin/env python
# encoding: utf-8
# Thomas Nagy, 2008-2010 (ita)
"""
Execute the tasks with gcc -MD, read the dependencies from the .d file
and prepare the dependency calculation for the next run
"""
import os, re, threading
import Task, Logs, Utils, preproc
lock = threading.Lock()
def detect(conf):
conf.env.append_unique('CCFLAGS', '-MD')
def scan(self):
"the scanner does not do anything initially"
nodes = self.generator.bld.node_deps.get(self.unique_id(), [])
names = []
return (nodes, names)
re_src = re.compile("^(\.\.)[\\/](.*)$")
def post_run(self):
# The following code is executed by threads, it is not safe, so a lock is needed...
if getattr(self, 'cached', None):
return Task.Task.post_run(self)
name = self.outputs[0].abspath(self.env)
name = name.rstrip('.o') + '.d'
txt = Utils.readf(name)
#os.unlink(name)
txt = txt.replace('\\\n', '')
lst = txt.strip().split(':')
val = ":".join(lst[1:])
val = val.split()
nodes = []
bld = self.generator.bld
f = re.compile("^("+self.env.variant()+"|\.\.)[\\/](.*)$")
for x in val:
if os.path.isabs(x):
if not preproc.go_absolute:
continue
lock.acquire()
try:
node = bld.root.find_resource(x)
finally:
lock.release()
else:
g = re.search(re_src, x)
if g:
x = g.group(2)
lock.acquire()
try:
node = bld.bldnode.parent.find_resource(x)
finally:
lock.release()
else:
g = re.search(f, x)
if g:
x = g.group(2)
lock.acquire()
try:
node = bld.srcnode.find_resource(x)
finally:
lock.release()
if id(node) == id(self.inputs[0]):
# ignore the source file, it is already in the dependencies
# this way, successful config tests may be retrieved from the cache
continue
if not node:
raise ValueError('could not find %r for %r' % (x, self))
else:
nodes.append(node)
Logs.debug('deps: real scanner for %s returned %s' % (str(self), str(nodes)))
bld.node_deps[self.unique_id()] = nodes
bld.raw_deps[self.unique_id()] = []
try:
del self.cache_sig
except:
pass
Task.Task.post_run(self)
for name in 'cc cxx'.split():
try:
cls = Task.TaskBase.classes[name]
except KeyError:
pass
else:
cls.post_run = post_run
cls.scan = scan
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