bitbake: lib/bb/siggen.py: log when tainting the signature of a task

Log a note when applying a taint to a task signature (e.g. when using
the -f or -C command line options) so that the user knows this has been
done.

(Bitbake rev: 0fd960fdea83874eedb541cbc2920257e0f3fb81)

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/siggen.py

@@ -268,6 +268,7 @@ class SignatureGeneratorBasicHash(SignatureGeneratorBasic):
         return ("%s.%s.%s.%s" % (stampbase, taskname, h, extrainfo)).rstrip('.')
 
     def invalidate_task(self, task, d, fn):
+        bb.note("Tainting hash to force rebuild of task %s, %s" % (fn, task))
         bb.build.write_taint(task, d, fn)
 
 def dump_this_task(outfile, d):