classes/sstate: don't overwrite buildhistory vardepsexclude

This was stomping over the value added in buildhistory.bbclass, leading
to task signatures *still* changing when buildhistory was added to
INHERIT.

Fixes [YOCTO #5897].

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

diff --git a/meta/classes/sstate.bbclass b/meta/classes/sstate.bbclass
index 9e09a736be9b4d5cd62e1baa96a89e85975e86da..03ee8206633af44291b5222b9b330708a170d294 100644 (file)
--- a/meta/classes/sstate.bbclass
+++ b/meta/classes/sstate.bbclass
@@ -215,7 +215,7 @@ def sstate_install(ss, d):
     for lock in locks:
         bb.utils.unlockfile(lock)
 
-sstate_install[vardepsexclude] = "SSTATE_DUPWHITELIST STATE_MANMACH SSTATE_MANFILEPREFIX"
+sstate_install[vardepsexclude] += "SSTATE_DUPWHITELIST STATE_MANMACH SSTATE_MANFILEPREFIX"
 sstate_install[vardeps] += "${SSTATEPOSTINSTFUNCS}"
 
 def sstate_installpkg(ss, d):