#
  # Kbuild for top-level directory of U-Boot
  # This file takes care of the following:
  # 1) Generate generic-asm-offsets.h
  # 2) Generate asm-offsets.h
  
  # Default sed regexp - multiline due to syntax constraints
  define sed-y
  	"s:[[:space:]]*\.ascii[[:space:]]*\"\(.*\)\":\1:; \
  	/^->/{s:->#\(.*\):/* \1 */:; \
  	s:^->\([^ ]*\) [\$$#]*\([-0-9]*\) \(.*\):#define \1 \2 /* \3 */:; \
  	s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
  	s:->::; p;}"
  endef
  
  # Use filechk to avoid rebuilds when a header changes, but the resulting file
  # does not
  define filechk_offsets
  	(set -e; \
  	 echo "#ifndef $2"; \
  	 echo "#define $2"; \
  	 echo "/*"; \
  	 echo " * DO NOT MODIFY."; \
  	 echo " *"; \
  	 echo " * This file was generated by Kbuild"; \
  	 echo " */"; \
  	 echo ""; \
  	 sed -ne $(sed-y); \
  	 echo ""; \
  	 echo "#endif" )
  endef
  
  #####
  # 1) Generate generic-asm-offsets.h
  
  generic-offsets-file := include/generated/generic-asm-offsets.h
  
  always  := $(generic-offsets-file)
  targets := lib/asm-offsets.s
  
  # We use internal kbuild rules to avoid the "is up to date" message from make
  lib/asm-offsets.s: lib/asm-offsets.c FORCE
  	$(Q)mkdir -p $(dir $@)
  	$(call if_changed_dep,cc_s_c)
  
  $(obj)/$(generic-offsets-file): lib/asm-offsets.s FORCE
  	$(call filechk,offsets,__GENERIC_ASM_OFFSETS_H__)
  
  #####
  # 2) Generate asm-offsets.h
  #
  
  ifneq ($(wildcard $(srctree)/arch/$(ARCH)/lib/asm-offsets.c),)
  offsets-file := include/generated/asm-offsets.h
  endif
  
  always  += $(offsets-file)
  targets += arch/$(ARCH)/lib/asm-offsets.s
  
  CFLAGS_asm-offsets.o := -DDO_DEPS_ONLY
  
  # We use internal kbuild rules to avoid the "is up to date" message from make
  arch/$(ARCH)/lib/asm-offsets.s: arch/$(ARCH)/lib/asm-offsets.c FORCE
  	$(Q)mkdir -p $(dir $@)
  	$(call if_changed_dep,cc_s_c)
  
  $(obj)/$(offsets-file): arch/$(ARCH)/lib/asm-offsets.s FORCE
  	$(call filechk,offsets,__ASM_OFFSETS_H__)