[PATCH v2 6/7] build: move $(compare-symbol-tables)

With the final linking logic now consolidated in scripts/Makefile.link,
$(compare-symbol-tables) also doesn't need setting anymore in
Kbuild.include.

Signed-off-by: Jan Beulich <[email protected]>
---
v2: New.

--- a/xen/scripts/Kbuild.include
+++ b/xen/scripts/Kbuild.include
@@ -56,19 +56,6 @@ define filechk
 	fi
 endef
 
-###
-# Compare the symbol tables of two object files.  As diff's -I option isn't
-# standardized, the name difference of the two object files needs abstracting
-# out.
-define compare-symbol-tables
-    ln -f $(1) $(@D)/.cst.$$$$; \
-    $(OBJDUMP) -t $(@D)/.cst.$$$$ > $(1).sym; \
-    ln -f $(2) $(@D)/.cst.$$$$; \
-    $(OBJDUMP) -t $(@D)/.cst.$$$$ > $(2).sym; \
-    rm -f $(@D)/.cst.$$$$; \
-    diff -u $(1).sym $(2).sym
-endef
-
 # as-insn: Check whether assembler supports an instruction.
 # Usage: cflags-y += $(call as-insn,CC FLAGS,"insn",option-yes,option-no)
 as-insn = $(if $(shell echo 'void _(void) { asm volatile ( $(2) ); }' \
--- a/xen/scripts/Makefile.link
+++ b/xen/scripts/Makefile.link
@@ -33,6 +33,18 @@ final-image-check-y ?= true
 	    $(if $(filter $(LAST_LINKING_PASS),$*), $(syms-warn-dup-y)) \
 	  > $@
 
+# Compare the symbol tables of two object files.  As diff's -I option isn't
+# standardized, the name difference of the two object files needs abstracting
+# out.
+define compare-symbol-tables
+    ln -f $(1) $(@D)/.cst.$$$$; \
+    $(OBJDUMP) -t $(@D)/.cst.$$$$ > $(1).sym; \
+    ln -f $(2) $(@D)/.cst.$$$$; \
+    $(OBJDUMP) -t $(@D)/.cst.$$$$ > $(2).sym; \
+    rm -f $(@D)/.cst.$$$$; \
+    diff -u $(1).sym $(2).sym
+endef
+
 .$(TARGET)-syms.%: $(objtree)/prelink.o .$(TARGET)-syms.%.o $(obj)/xen.lds
 	$(LD) $(XEN_LDFLAGS) -T $(obj)/xen.lds $(filter %.o,$^) \
 	      $(build_id_linker) --strip-debug -o $@