[xen staging] libs/light: Rework acpi table build targets

[patchbot@xxxxxxx]

commit 9eb46d3f9808417ee84a38778d808d34058fb546
Author:     Anthony PERARD <anthony.perard@xxxxxxxxxx>
AuthorDate: Thu Oct 13 14:05:08 2022 +0100
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Fri Oct 14 20:56:57 2022 +0100

    libs/light: Rework acpi table build targets
    
    Currently, a rebuild of libxl will always rebuild "build.o". This is because
    the target depends on "acpi" which never exist. So instead we will have
    "build.o" have as prerequisites targets that are actually generated by 
"acpi",
    that is $(DSDT_FILES-y).
    
    While "dsdt_*.c" isn't really a dependency for "build.o", a side
    effect of building that dsdt_*.c is to also generate the "ssdt_*.h"
    that "build.o" needs, but I don't want to list all the headers needed
    by "build.o" and duplicate the information available in
    "libacpi/Makefile" at this time.
    
    Also avoid duplicating the "acpi" target for Arm, and unique one for
    both architecture. And move the "acpi" target to be with other targets
    rather than in the middle of the source listing. For the same reason,
    move the prerequisites listing for both $(DSDT_FILES-y) and "build.o".
    
    Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
    Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Release-acked-by: Henry Wang <Henry.Wang@xxxxxxx>
---
 tools/libs/light/Makefile | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/tools/libs/light/Makefile b/tools/libs/light/Makefile
index 13545654c2..d84e5f3cd9 100644
--- a/tools/libs/light/Makefile
+++ b/tools/libs/light/Makefile
@@ -32,14 +32,10 @@ ACPI_PATH  = $(XEN_ROOT)/tools/libacpi
 DSDT_FILES-$(CONFIG_X86) = dsdt_pvh.c
 ACPI_OBJS  = $(patsubst %.c,%.o,$(DSDT_FILES-y)) build.o static_tables.o
 ACPI_PIC_OBJS = $(patsubst %.o,%.opic,$(ACPI_OBJS))
-$(DSDT_FILES-y) build.o build.opic: acpi
+
 vpath build.c $(ACPI_PATH)/
 vpath static_tables.c $(ACPI_PATH)/
 
-.PHONY: acpi
-acpi:
-       $(MAKE) -C $(ACPI_PATH) ACPI_BUILD_DIR=$(CURDIR) 
DSDT_FILES="$(DSDT_FILES-y)"
-
 OBJS-$(CONFIG_X86) += $(ACPI_OBJS)
 
 CFLAGS += -Wno-format-zero-length -Wmissing-declarations \
@@ -58,8 +54,6 @@ ifeq ($(CONFIG_ARM_64),y)
 DSDT_FILES-y = dsdt_anycpu_arm.c
 OBJS-y += libxl_arm_acpi.o
 OBJS-y += $(DSDT_FILES-y:.c=.o)
-dsdt_anycpu_arm.c:
-       $(MAKE) -C $(ACPI_PATH) ACPI_BUILD_DIR=$(CURDIR) 
DSDT_FILES="$(DSDT_FILES-y)"
 else
 OBJS-$(CONFIG_ARM) += libxl_arm_no_acpi.o
 endif
@@ -191,6 +185,12 @@ all: $(CLIENTS) $(TEST_PROGS) $(AUTOSRCS) $(AUTOINCS)
 
 $(OBJS-y) $(PIC_OBJS) $(SAVE_HELPER_OBJS) $(LIBXL_TEST_OBJS) 
$(TEST_PROG_OBJS): $(AUTOINCS) libxl.api-ok
 
+$(DSDT_FILES-y): acpi
+
+# Depend on the source files generated by the "acpi" target even though
+# "build.o" don't needs them.  It does need the generated headers.
+build.o build.opic: $(DSDT_FILES-y)
+
 libxl.api-ok: check-libxl-api-rules _libxl.api-for-check
        $(PERL) $^
        touch $@
@@ -227,6 +227,10 @@ _libxl_type%.h _libxl_type%_json.h _libxl_type%_private.h 
_libxl_type%.c: libxl_
 $(XEN_INCLUDE)/_%.h: _%.h
        $(call move-if-changed,_$*.h,$(XEN_INCLUDE)/_$*.h)
 
+.PHONY: acpi
+acpi:
+       $(MAKE) -C $(ACPI_PATH) ACPI_BUILD_DIR=$(CURDIR) 
DSDT_FILES="$(DSDT_FILES-y)"
+
 libxenlight_test.so: $(PIC_OBJS) $(LIBXL_TEST_OBJS)
        $(CC) $(LDFLAGS) -Wl,$(SONAME_LDFLAG) -Wl,libxenlight.so.$(MAJOR) 
$(SHLIB_LDFLAGS) -o $@ $^ $(LDLIBS) $(APPEND_LDFLAGS)
 
--
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