sstate.bbclass: make SSTATE_PRUNE_OBSOLETEWORKDIR could be overwritten

Define variable SSTATE_PRUNE_OBSOLETEWORKDIR with '?=' in sstate.bbclass,
then it could be overwritten by user configuration.

Signed-off-by: Kai Kang <kai.kang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

diff --git a/meta/classes/sstate.bbclass b/meta/classes/sstate.bbclass
index 084d6315239499a72631f358d2fd602a4b6a40d7..ecf08fb2d02cc49b13d4cf1cff28c2233ec0d3b9 100644 (file)
--- a/meta/classes/sstate.bbclass
+++ b/meta/classes/sstate.bbclass
@@ -1040,7 +1040,7 @@ python sstate_eventhandler() {
         bb.siggen.dump_this_task(sstatepkg + '_' + taskname + ".tgz" ".siginfo", d)
 }
 
-SSTATE_PRUNE_OBSOLETEWORKDIR = "1"
+SSTATE_PRUNE_OBSOLETEWORKDIR ?= "1"
 
 # Event handler which removes manifests and stamps file for
 # recipes which are no longer reachable in a build where they