Kbuild

   1 #
   2 # Kbuild for top-level directory of U-Boot
   3 # This file takes care of the following:
   4 # 1) Generate generic-asm-offsets.h
   5 # 2) Generate asm-offsets.h
   6
   7 # Default sed regexp - multiline due to syntax constraints
   8 define sed-y
   9         "s:[[:space:]]*\.ascii[[:space:]]*\"\(.*\)\":\1:; \
  10         /^->/{s:->#\(.*\):/* \1 */:; \
  11         s:^->\([^ ]*\) [\$$#]*\([-0-9]*\) \(.*\):#define \1 \2 /* \3 */:; \
  12         s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
  13         s:->::; p;}"
  14 endef
  15
  16 # Use filechk to avoid rebuilds when a header changes, but the resulting file
  17 # does not
  18 define filechk_offsets
  19         (set -e; \
  20          echo "#ifndef $2"; \
  21          echo "#define $2"; \
  22          echo "/*"; \
  23          echo " * DO NOT MODIFY."; \
  24          echo " *"; \
  25          echo " * This file was generated by Kbuild"; \
  26          echo " */"; \
  27          echo ""; \
  28          sed -ne $(sed-y); \
  29          echo ""; \
  30          echo "#endif" )
  31 endef
  32
  33 #####
  34 # 1) Generate generic-asm-offsets.h
  35
  36 generic-offsets-file := include/generated/generic-asm-offsets.h
  37
  38 always  := $(generic-offsets-file)
  39 targets := lib/asm-offsets.s
  40
  41 # We use internal kbuild rules to avoid the "is up to date" message from make
  42 lib/asm-offsets.s: lib/asm-offsets.c FORCE
  43         $(Q)mkdir -p $(dir $@)
  44         $(call if_changed_dep,cc_s_c)
  45
  46 $(obj)/$(generic-offsets-file): lib/asm-offsets.s FORCE
  47         $(call filechk,offsets,__GENERIC_ASM_OFFSETS_H__)
  48
  49 #####
  50 # 2) Generate asm-offsets.h
  51 #
  52
  53 ifneq ($(wildcard $(srctree)/arch/$(ARCH)/lib/asm-offsets.c),)
  54 offsets-file := include/generated/asm-offsets.h
  55 endif
  56
  57 always  += $(offsets-file)
  58 targets += arch/$(ARCH)/lib/asm-offsets.s
  59
  60 CFLAGS_asm-offsets.o := -DDO_DEPS_ONLY
  61
  62 # We use internal kbuild rules to avoid the "is up to date" message from make
  63 arch/$(ARCH)/lib/asm-offsets.s: arch/$(ARCH)/lib/asm-offsets.c FORCE
  64         $(Q)mkdir -p $(dir $@)
  65         $(call if_changed_dep,cc_s_c)
  66
  67 $(obj)/$(offsets-file): arch/$(ARCH)/lib/asm-offsets.s FORCE
  68         $(call filechk,offsets,__ASM_OFFSETS_H__)