1 files changed, 28 insertions, 0 deletions
diff --git a/waflib/extras/build_file_tracker.py b/waflib/extras/build_file_tracker.py
new file mode 100644
index 00000000..c4f26fd0
--- /dev/null
+++ b/waflib/extras/build_file_tracker.py
@@ -0,0 +1,28 @@
+#! /usr/bin/env python
+# encoding: utf-8
+# Thomas Nagy, 2015
+
+"""
+Force files to depend on the timestamps of those located in the build directory. You may
+want to use this to force partial rebuilds, see playground/track_output_files/ for a working example.
+
+Note that there is a variety of ways to implement this, one may want use timestamps on source files too for example,
+or one may want to hash the files in the source directory only under certain conditions (md5_tstamp tool)
+or to hash the file in the build directory with its timestamp
+"""
+
+import os
+from waflib import Node, Utils
+
+def get_bld_sig(self):
+	if not self.is_bld() or self.ctx.bldnode is self.ctx.srcnode:
+		return Utils.h_file(self.abspath())
+
+	try:
+		# add the creation time to the signature
+		return self.sig + str(os.stat(self.abspath()).st_mtime)
+	except AttributeError:
+		return None
+
+Node.Node.get_bld_sig = get_bld_sig
+