[openwrt/openwrt] x86: fix upgrade by emptying SUPPORTED_DEVICES

[LEDE Commits]

adrian pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/29167cbca3653de05a8b915bc21327dac7d05174

commit 29167cbca3653de05a8b915bc21327dac7d05174
Author: Adrian Schmutzler <freifunk at adrianschmutzler.de>
AuthorDate: Sat Jan 23 22:09:27 2021 +0100

    x86: fix upgrade by emptying SUPPORTED_DEVICES
    
    x86 uses append-metadata, but only for signing and not for the
    metadata itself.
    
    Since recently SUPPORTED_DEVICES was assigned with a global value
    and is not empty anymore, append-metadata will now actually put
    metadata into x86 images. This breaks sysupgrade on x86.
    
    To fix it for the moment, let's just empty SUPPORTED_DEVICES for
    this target again.
    
    In the long term, one should either not add metadata to the images
    if it is not desired, and/or remove the unintended fwtool check.
    
    Fixes: f52081bcf938 ("treewide: provide global default for SUPPORTED_DEVICES")
    
    Signed-off-by: Adrian Schmutzler <freifunk at adrianschmutzler.de>
---
 target/linux/x86/image/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/target/linux/x86/image/Makefile b/target/linux/x86/image/Makefile
index 85c850c128..81aab20666 100644
--- a/target/linux/x86/image/Makefile
+++ b/target/linux/x86/image/Makefile
@@ -144,6 +144,7 @@ define Device/Default
   endif
   IMAGES := $$(IMAGES-y)
   ARTIFACTS := $$(ARTIFACTS-y)
+  SUPPORTED_DEVICES :=
 endef
 
 include $(SUBTARGET).mk