From 3a4f6b60db1b3fd43ca0449f9259ebdf4f5d4b62 Mon Sep 17 00:00:00 2001 From: Michal Marek Date: Fri, 27 Mar 2015 10:59:03 +0900 Subject: kbuild: Don't reset timestamps in include/generated if not needed Use filechk to generate asm-offsets.h and generic-asm-offsets.h. Based on a patch by Valdis Kletnieks. Reported-by: Valdis Kletnieks Acked-by: Valdis Kletnieks Reviewed-by: Masahiro Yamada Signed-off-by: Michal Marek [ imported from Linux Kernel, commit 70a4fd6c56d0, with adjustment for U-Boot ] Signed-off-by: Masahiro Yamada --- Kbuild | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-) diff --git a/Kbuild b/Kbuild index 51f7433..465b930 100644 --- a/Kbuild +++ b/Kbuild @@ -13,8 +13,9 @@ define sed-y s:->::; p;}" endef -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"; \ @@ -24,9 +25,9 @@ define cmd_offsets echo " * This file was generated by Kbuild"; \ echo " */"; \ echo ""; \ - sed -ne $(sed-y) $<; \ + sed -ne $(sed-y); \ echo ""; \ - echo "#endif" ) > $@ + echo "#endif" ) endef ##### @@ -42,9 +43,8 @@ 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 Kbuild - $(Q)mkdir -p $(dir $@) - $(call cmd,offsets,__GENERIC_ASM_OFFSETS_H__) +$(obj)/$(generic-offsets-file): lib/asm-offsets.s FORCE + $(call filechk,offsets,__GENERIC_ASM_OFFSETS_H__) ##### # 2) Generate asm-offsets.h @@ -65,5 +65,5 @@ arch/$(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 Kbuild - $(call cmd,offsets,__ASM_OFFSETS_H__) +$(obj)/$(offsets-file): arch/$(ARCH)/lib/asm-offsets.s FORCE + $(call filechk,offsets,__ASM_OFFSETS_H__) -- cgit v1.1