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The build system would not re-compile the head.S. Because in the build rules, the dependencies are setting to .*.d (eg. DEPS = .*.d) files in the same folder as Makefile. But head.S is very special, it was used by the Makefile in the parent folder: "ALL_OBJS := $(TARGET_SUBARCH)/head.o". In this case, the build system could not find the dependency in DEPS. When we update the header files, the build system is unware of this update. If we re-build the Xen without doing make clean or touching the head.S, the build system will not recompile the head.S. Signed-off-by: Wei Chen --- In my mind, the better way to fix this bug is converting the DEPS from ALL_OBJS. But I am afraid of the impact. I am not sure whether there are some dependencies are not generated from obj files. --- xen/Rules.mk | 3 ++- xen/arch/arm/Makefile | 2 ++ 2 files changed, 4 insertions(+), 1 deletion(-) diff --git a/xen/Rules.mk b/xen/Rules.mk index 961d533..1247b61 100644 --- a/xen/Rules.mk +++ b/xen/Rules.mk @@ -92,9 +92,10 @@ LDFLAGS += $(LDFLAGS-y) include $(BASEDIR)/arch/$(TARGET_ARCH)/Rules.mk +DEPS = .*.d + include Makefile -DEPS = .*.d define gendep ifneq ($(1),$(subst /,:,$(1))) DEPS += $(dir $(1)).$(notdir $(1)).d diff --git a/xen/arch/arm/Makefile b/xen/arch/arm/Makefile index af4d0e1..9e38da3 100644 --- a/xen/arch/arm/Makefile +++ b/xen/arch/arm/Makefile @@ -51,6 +51,8 @@ endif ALL_OBJS := $(TARGET_SUBARCH)/head.o $(ALL_OBJS) +DEPS += $(TARGET_SUBARCH)/.head.o.d + $(TARGET): $(TARGET)-syms $(TARGET).axf $(OBJCOPY) -O binary -S $< $@ ifeq ($(CONFIG_ARM_64),y)