path: root/waflib/extras/build_file_tracker.py
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diff --git a/waflib/extras/build_file_tracker.py b/waflib/extras/build_file_tracker.py
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+#! /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