[xen staging] Arm: fix build with CONFIG_DTB_FILE set

[patchbot@xxxxxxx]

commit 40675b4b874cb9fee0d4f0e12bb3e153ee1c135a
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Thu May 7 13:18:24 2020 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu May 7 13:18:24 2020 +0200

    Arm: fix build with CONFIG_DTB_FILE set
    
    Recent changes no longer allow modification of AFLAGS. The needed
    conversion was apparently missed in 2740d96efdd3 ("xen/build: have the
    root Makefile generates the CFLAGS").
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Julien Grall <jgrall@xxxxxxxxxx>
---
 xen/arch/arm/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/arch/arm/Makefile b/xen/arch/arm/Makefile
index b79ad55646..c1a1b5e803 100644
--- a/xen/arch/arm/Makefile
+++ b/xen/arch/arm/Makefile
@@ -68,7 +68,7 @@ extra-y += $(TARGET_SUBARCH)/head.o
 
 ifdef CONFIG_DTB_FILE
 obj-y += dtb.o
-AFLAGS += -DCONFIG_DTB_FILE=\"$(CONFIG_DTB_FILE)\"
+AFLAGS-y += -DCONFIG_DTB_FILE=\"$(CONFIG_DTB_FILE)\"
 endif
 
 ALL_OBJS := $(TARGET_SUBARCH)/head.o $(ALL_OBJS)
--
generated by git-patchbot for /home/xen/git/xen.git#staging