bitbake: data_smart: fix ??= operator for variable flags

??= operator works for variable value by defining a "_defaultval" flag.

Use something similar for flags: For the default value of the flag
"flag_name", define a flag "_defaultval_flag_flagname" that is used when
reading flag_name but no other value has been set.

Fixes [YOCTO #15685]

(Bitbake rev: 0329a7e3ac694737f2d2c1861f65492551360663)

Signed-off-by: Yoann Congal <yoann.congal@smile.fr>
Reviewed-by: Ghislain Mangé <ghislain.mange@smile.fr>
Suggested-by: Ola Nilsson <ola.x.nilsson@axis.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/bitbake/lib/bb/data_smart.py b/bitbake/lib/bb/data_smart.py
index c6049d578e..897ceeb32c 100644
--- a/bitbake/lib/bb/data_smart.py
+++ b/bitbake/lib/bb/data_smart.py
@@ -827,6 +827,8 @@ class DataSmart(MutableMapping):
                 value = copy.copy(local_var[flag])
             elif flag == "_content" and "_defaultval" in local_var and not noweakdefault:
                 value = copy.copy(local_var["_defaultval"])
+            elif "_defaultval_flag_"+flag in local_var and not noweakdefault:
+                value = copy.copy(local_var["_defaultval_flag_"+flag])
 
 
         if flag == "_content" and local_var is not None and ":append" in local_var and not parsing: