After a talk with Hongxu jia, we decided to change the 
do_install_append_class-target()
to do_install_append(), in this function, added the following:
if [ "${CLASSOVERRIDE}" = "class-native" ]; then
                 return
          fi
in this way, avoid the conflict with the following 
do_install_append_class-native function.

//dengke
On 2016年03月17日 05:52, Paul Eggleton wrote:
> On Wed, 16 Mar 2016 21:30:35 Burton, Ross wrote:
>> On 16 March 2016 at 02:49, Dengke Du <dengke.du@windriver.com> wrote:
>>> When we create nativesdk-coreutils, a lot of warnings appear,it
>>> show many files can't find.
>> I don't think anywhere where nativesdk packages are used actually runs the
>> postinst scripts to create the alternative links, so maybe we should be
>> stopping update-alternatives do anything in nativesdk (just like it doesn't
>> do anything for native)?
> Actually I checked this by adding a dummy line which creates a file in $D to
> the dbus postinst and then adding nativesdk-dbus to buildtools-tarball - it
> seems that the postinst does actually get run. As long as the postinst can
> successfully run at SDK construction time then apparently it should work.
>
> Cheers,
> Paul
>