Use filechk to generate asm-offsets.h and generic-asm-offsets.h.
Based on a patch by Valdis Kletnieks.
Reported-by: Valdis Kletnieks <Valdis.Kletnieks@vt.edu>
Acked-by: Valdis Kletnieks <Valdis.Kletnieks@vt.edu>
Reviewed-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Michal Marek <mmarek@suse.cz>
[ imported from Linux Kernel, commit
70a4fd6c56d0,
with adjustment for U-Boot ]
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
-quiet_cmd_offsets = GEN $@
-define cmd_offsets
+# 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"; \
(set -e; \
echo "#ifndef $2"; \
echo "#define $2"; \
echo " * This file was generated by Kbuild"; \
echo " */"; \
echo ""; \
echo " * This file was generated by Kbuild"; \
echo " */"; \
echo ""; \
$(Q)mkdir -p $(dir $@)
$(call if_changed_dep,cc_s_c)
$(Q)mkdir -p $(dir $@)
$(call if_changed_dep,cc_s_c)
-$(obj)/$(generic-offsets-file): lib/asm-offsets.s Kbuild
- $(Q)mkdir -p $(dir $@)
- $(call cmd,offsets,__GENERIC_ASM_OFFSETS_H__)
+$(obj)/$(generic-offsets-file): lib/asm-offsets.s FORCE
+ $(call filechk,offsets,__GENERIC_ASM_OFFSETS_H__)
#####
# 2) Generate asm-offsets.h
#####
# 2) Generate asm-offsets.h
$(Q)mkdir -p $(dir $@)
$(call if_changed_dep,cc_s_c)
$(Q)mkdir -p $(dir $@)
$(call if_changed_dep,cc_s_c)
-$(obj)/$(offsets-file): arch/$(ARCH)/lib/asm-offsets.s Kbuild
- $(call cmd,offsets,__ASM_OFFSETS_H__)
+$(obj)/$(offsets-file): arch/$(ARCH)/lib/asm-offsets.s FORCE
+ $(call filechk,offsets,__ASM_OFFSETS_H__)