image.bbclass: improve setup of flags

Replaced setVarFlag calls to appendVarFlag to allow
modification of prefuncs, postfuncs and subimages flags
in inherited image classes.

[YOCTO #11372]

(From OE-Core rev: 6690f3ab43c04fa7cff7215d4a5d8d639e41aed8)

Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 4 insertions, 3 deletions

diff --git a/meta/classes/image.bbclass b/meta/classes/image.bbclass
index ff4eda19e9..e18ac721c2 100644
--- a/meta/classes/image.bbclass
+++ b/meta/classes/image.bbclass
@@ -496,9 +496,10 @@ python () {
         d.setVar(task, '\n'.join(cmds))
         d.setVarFlag(task, 'func', '1')
         d.setVarFlag(task, 'fakeroot', '1')
-        d.setVarFlag(task, 'prefuncs', debug + 'set_image_size')
-        d.setVarFlag(task, 'postfuncs', 'create_symlinks')
-        d.setVarFlag(task, 'subimages', ' '.join(subimages))
+
+        d.appendVarFlag(task, 'prefuncs', ' ' + debug + ' set_image_size')
+        d.appendVarFlag(task, 'postfuncs', ' create_symlinks')
+        d.appendVarFlag(task, 'subimages', ' ' + ' '.join(subimages))
         d.appendVarFlag(task, 'vardeps', ' '.join(vardeps))
         d.appendVarFlag(task, 'vardepsexclude', 'DATETIME')