default-versions.inc: Make PREFERRED_VERSION_openssl* overwritable

defaultsetup.conf and therefore default-versions.inc is sourced pretty late in bitbake.conf.
default-versions.inc overwrites previous assignments of PREFERRED_VERSION_openssl.
Assigning it with ?= allows other .conf files to assign correctly.
in particular assignment in conf/local.conf and machine config is used instead of default.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

diff --git a/meta/conf/distro/include/default-versions.inc b/meta/conf/distro/include/default-versions.inc
index 868073843af671ab4279cdb7121144fc1fb644f2..3d88e8f656a8290a1713d199869a875436ef4703 100644 (file)
--- a/meta/conf/distro/include/default-versions.inc
+++ b/meta/conf/distro/include/default-versions.inc
@@ -2,6 +2,6 @@
 # Default preferred versions
 #
 
-PREFERRED_VERSION_openssl = "1.0.%"
-PREFERRED_VERSION_openssl-native = "1.0.%"
-PREFERRED_VERSION_nativesdk-openssl = "1.0.%"
+PREFERRED_VERSION_openssl ?= "1.0.%"
+PREFERRED_VERSION_openssl-native ?= "1.0.%"
+PREFERRED_VERSION_nativesdk-openssl ?= "1.0.%"