image.bbclass: Use ?= to set LINGUAS_INSTALL

Hob may dynamically sets BBLAYERS to bitbake server, thus we need a
flexible way to load LINGUAS_INSTALL value.

Signed-off-by: Dongxiao Xu <dongxiao.xu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

diff --git a/meta/classes/image.bbclass b/meta/classes/image.bbclass
index 275b28f4ac798ec15ee4b4285da1524a63fbf0e4..295b653c970f29ee35c2762bc9e3f1a1cc8000d3 100644 (file)
--- a/meta/classes/image.bbclass
+++ b/meta/classes/image.bbclass
@@ -119,7 +119,7 @@ ROOTFS_POSTPROCESS_COMMAND ?= ""
 # some default locales
 IMAGE_LINGUAS ?= "de-de fr-fr en-gb"
 
-LINGUAS_INSTALL = "${@" ".join(map(lambda s: "locale-base-%s" % s, d.getVar('IMAGE_LINGUAS', 1).split()))}"
+LINGUAS_INSTALL ?= "${@" ".join(map(lambda s: "locale-base-%s" % s, d.getVar('IMAGE_LINGUAS', 1).split()))}"
 
 PSEUDO_PASSWD = "${IMAGE_ROOTFS}"