toolchain_gcc.py 文件源码

def check_and_update_hash_and_deps(self, bn):
        # Get latest computed hash and deps
        oldhash, deps = self.srcmd5.get(bn, (None, []))
        # read source
        src = open(os.path.join(self.buildpath, bn)).read()
        # compute new hash
        newhash = hashlib.md5(src).hexdigest()
        # compare
        match = (oldhash == newhash)
        if not match:
            # file have changed
            # update direct dependencies
            deps = []
            self.append_cfile_deps(src, deps)
            # store that hashand deps
            self.srcmd5[bn] = (newhash, deps)
        # recurse through deps
        # TODO detect cicular deps.
        return reduce(operator.and_, map(self.check_and_update_hash_and_deps, deps), match)