utils.bbclass/multilib.class: Added misc supporting functions.

1. Added variable MULTILIB_VARIANTS to store all the instance variants
for multilib extend.

2. Added function all_multilib_tune_values to collect the variable
values for all multilib instance.

3. multilib bbclass handler will save the orignal value of all variables
defined in MULTILIB_SAVE_VARNAME.

(From OE-Core rev: 18bba910e04bff75460f408e4557d4bae21ad592)

Signed-off-by: Lianhao Lu <lianhao.lu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/meta/conf/multilib.conf b/meta/conf/multilib.conf
index f2a2002355..36793d247e 100644
--- a/meta/conf/multilib.conf
+++ b/meta/conf/multilib.conf
@@ -1,6 +1,9 @@
 
 baselib = "${@d.getVar('BASE_LIB_tune-' + (d.getVar('DEFAULTTUNE', True) or 'INVALID'), True) or 'lib'}"
 
+MULTILIB_VARIANTS = "${@extend_variants(d,'MULTILIBS','multilib')}"
+MULTILIB_SAVE_VARNAME = "DEFAULTTUNE"
+
 MULTILIBS ??= "multilib:lib32"
 
 BBCLASSEXTEND_append_pn-acl = " ${MULTILIBS}"