[PATCH] mulitlib.bbclass: Ensure correct value of ALL_MULTILIB_PACKAGE_ARCHS is preserved

[Richard Purdie <richard.purdie@linuxfoundation.org>]

The value of ALL_MULTILIB_PACKAGE_ARCHS needs to be consistent both
in multilib extended recipes and in normal context. If this isn't the
case it can lead to inconsistent configuration files at a minimum.

This patch ensures the value is preserved during the class extension code
since computing it after that point is hard.

[YOCTO #2290]

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
---
diff --git a/meta/classes/multilib.bbclass b/meta/classes/multilib.bbclass
index 61b7765..c2d2f85 100644
--- a/meta/classes/multilib.bbclass
+++ b/meta/classes/multilib.bbclass
@@ -20,6 +20,9 @@ python multilib_virtclass_handler () {
         val=e.data.getVar(name, True)
         if val:
             e.data.setVar(name + "_MULTILIB_ORIGINAL", val)
+
+    # Expand this since this won't work correctly once we set a multilib into place
+    e.data.setVar("ALL_MULTILIB_PACKAGE_ARCHS", e.data.getVar("ALL_MULTILIB_PACKAGE_ARCHS", True))
  
     override = ":virtclass-multilib-" + variant