First commit

Kbuild

@@ -0,0 +1,68 @@
+#
+# 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__)