Or else absolute paths may be expanded which then breaks sstate signature
comparison.

I'm not sure whether pre/post funcs can be expanded or not. They are
invoked at image build or on the target, and thus need be expanded some
place. But if one recipe does use directories under TMP in its postinst
helpers, this would be an issue again.

Signed-off-by: Kevin Tian <kevin.tian@intel.com>

With new batch ability, we can use below simple 2 lines for multiple alternatives
updates:

ALTERNATIVE_LINKS = "${bindir}/cmd1 {sbindir}/cmd2 ..."
ALTERNATIVE_PRIORITY = "100"

Then for each command "/path/cmd" listed in ALTERNATIVE_LINKS, below is done
automatically:

    ${D}/path/cmd is renamed to ${D}/path/cmd.{PN}
    a new alternative named 'cmd' is created which:
        links /path/cmd to /path/cmd.{PN} with priority specified in ALTERNATIVE_PRIORITY

This way the recipe with multiple alternatives could be simplified a lot. There
are still some cases where above assumptions may break, but I expect more recipes
should benefit from this simple enhancement

Fix [BUGID #257]

Signed-off-by: Kevin Tian <kevin.tian@intel.com>

Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

git-svn-id: https://svn.o-hand.com/repos/poky/trunk@875 311d38ba-8fff-0310-9ca6-ca027cbcb966

git-svn-id: https://svn.o-hand.com/repos/poky/trunk@530 311d38ba-8fff-0310-9ca6-ca027cbcb966