From 046c55a97ec3b397994f9f1c0c85a796ca116322 Mon Sep 17 00:00:00 2001
From: Thomas Nagy <tnagy2pow10@gmail.com>
Date: Tue, 28 Oct 2014 22:15:52 +0100
Subject: [PATCH] Issue 1506

---
 waflib/Task.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/waflib/Task.py b/waflib/Task.py
index 4c7be4af..5b267ddb 100644
--- a/waflib/Task.py
+++ b/waflib/Task.py
@@ -729,12 +729,14 @@ class Task(TaskBase):
 			try:
 				if prev == self.compute_sig_implicit_deps():
 					return prev
-			except Exception:
+			except Errors.TaskNotReady:
+				raise
+			except IOError:
 				# when a file was renamed (IOError usually), remove the stale nodes (headers in folders without source files)
 				# this will break the order calculation for headers created during the build in the source directory (should be uncommon)
 				# the behaviour will differ when top != out
 				for x in bld.node_deps.get(self.uid(), []):
-					if x.is_child_of(bld.srcnode):
+					if not x.is_bld():
 						try:
 							os.stat(x.abspath())
 						except OSError: