[yocto] [PATCH 1/1] meta-yocto/local.conf.sample: change = to ?= for BB_NUMBER_THREADS and PARALLEL_MAKE

[Shane Wang]

In the current local.conf, BB_NUMBER_THREADS and PARALLEL_MAKE are assigned
by '=', which overwrites the values set from the Hob. To avoid that, use '?='
instead.

[Yocto #2210]

Signed-off-by: Shane Wang <shane.wang at intel.com>
---
 meta-yocto/conf/local.conf.sample |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/meta-yocto/conf/local.conf.sample b/meta-yocto/conf/local.conf.sample
index 38507e3..a4a8192 100644
--- a/meta-yocto/conf/local.conf.sample
+++ b/meta-yocto/conf/local.conf.sample
@@ -17,12 +17,12 @@
 # These two options control how much parallelism BitBake should use. The first 
 # option determines how many tasks bitbake should run in parallel:
 #
-#BB_NUMBER_THREADS = "4"
+#BB_NUMBER_THREADS ?= "4"
 # 
 # The second option controls how many processes make should run in parallel when
 # running compile tasks:
 #
-#PARALLEL_MAKE = "-j 4"
+#PARALLEL_MAKE ?= "-j 4"
 #
 # For a quad-core machine, BB_NUMBER_THREADS = "4", PARALLEL_MAKE = "-j 4" would
 # be appropriate for example.
-- 
1.7.6