Scons Install Builder with hard link support - scons

Question

I am using Scons for building an environment which include propagating a partial directory structure including hard links.
So it looks like this, I compile some sources into $BIN directory, some of the created targets are hard links, and in some other module I am scanning the $BIN directory and triggering a builder which either strip the the binaries to the new target, but maintain hard links. So if there are two files which are hard links in source, it copies the first and create hard link to the other target for the second.
Now the problem is if I try to run this with -j4 for example, a race condition could happen, because at the moment the builder tries to create a hard link, the target which is created by strip is not done yet.
Below is my builder:
def GenerateM3Strip(target, source, env):
if type(source) is list:
source = source[0]
if type(target) is list:
target = target[0]
src_stat = os.stat(source.abspath)
if (src_stat.st_nlink > 1
and src_stat.st_ino in GenerateM3Strip.inodes_dict):
previous_target = GenerateM3Strip.inodes_dict[src_stat.st_ino]
if target.get_dir().get_path() in previous_target:
source = previous_target[target.get_dir().get_path()]
print('LinkTarget: %s %s' % (source.get_path(), target.get_path()))
try:
os.unlink(target.get_path())
except Exception:
pass
os.link(source.get_path(), target.get_path())
return
# We have to keep a dictionary of target directory and target pairs, to
# support separate hard links for different directory targets, for example:
# fsdata/default and fsdata/bench
GenerateM3Strip.inodes_dict[src_stat.st_ino] = {
target.get_dir().get_path(): target}
action_str = env.subst(cross + 'strip -o $TARGET $SOURCE',
source=source, target=target)
env.Execute(env.Action(action_str))
GenerateM3Strip.inodes_dict = {}