[XEN PATCH v4 03/18] build,arm: Fix deps check of head.o

[Anthony PERARD <anthony.perard@xxxxxxxxxx>]

arm*/head.o isn't in obj-y or extra-y, so make don't load the
associated .*.d file (or .*.cmd file when if_changed will be used).
There is a workaround where .*.d file is added manually into DEPS.

Changing DEPS isn't needed, we can simply add head.o into extra-y and
the dependency files will be loaded.

Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
---

Notes:
    v4:
    - new patch, fix rebuild of head.o with "xen/build: Start using
      if_changed" applied

 xen/arch/arm/Makefile | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/xen/arch/arm/Makefile b/xen/arch/arm/Makefile
index 12f92a4bd3f9..7273f356f190 100644
--- a/xen/arch/arm/Makefile
+++ b/xen/arch/arm/Makefile
@@ -62,6 +62,7 @@ obj-$(CONFIG_SBSA_VUART_CONSOLE) += vpl011.o
 obj-y += vsmc.o
 obj-y += vpsci.o
 obj-y += vuart.o
+extra-y += $(TARGET_SUBARCH)/head.o
 
 #obj-bin-y += ....o
 
@@ -72,8 +73,6 @@ endif
 
 ALL_OBJS := $(TARGET_SUBARCH)/head.o $(ALL_OBJS)
 
-DEPS += $(TARGET_SUBARCH)/.head.o.d
-
 ifdef CONFIG_LIVEPATCH
 all_symbols = --all-symbols
 ifdef CONFIG_FAST_SYMBOL_LOOKUP
-- 
Anthony PERARD