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, 6 insertions, 1 deletions

diff --git a/meta/classes/multilib.bbclass b/meta/classes/multilib.bbclass
index 6e1669fb7f..571b7be961 100644
--- a/meta/classes/multilib.bbclass
+++ b/meta/classes/multilib.bbclass
@@ -6,7 +6,12 @@ python multilib_virtclass_handler () {
     variant = e.data.getVar("BBEXTENDVARIANT", True)
     if cls != "multilib" or not variant:
         return
- 
+    save_var_name=e.data.getVar("MULTILIB_SAVE_VARNAME", True) or ""
+    for name in save_var_name.split():
+        val=e.data.getVar(name, True)
+        if val:
+            e.data.setVar(name + "_MULTILIB_ORIGINAL", val)
+
     override = ":virtclass-multilib-" + variant
 
     e.data.setVar("MLPREFIX", variant + "-")