base.bbclass: Only set BB_DEFAULT_TASK if it wasn't set already

diff --git a/classes/base.bbclass b/classes/base.bbclass
index 7609c05..615d02d 100644 (file)
--- a/classes/base.bbclass
+++ b/classes/base.bbclass
@@ -1,4 +1,4 @@
-BB_DEFAULT_TASK = "build"
+BB_DEFAULT_TASK ?= "build"
 
 # like os.path.join but doesn't treat absolute RHS specially
 def base_path_join(a, *p):