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authorMichal Marek <mmarek@suse.cz>2015-03-27 10:59:03 +0900
committerTom Rini <trini@konsulko.com>2015-03-28 09:03:09 -0400
commit3a4f6b60db1b3fd43ca0449f9259ebdf4f5d4b62 (patch)
tree4ff2560df7f606111cd9f3195248a2b9df9cca4a /Kbuild
parentd99cd32f05597f18fa1691404e112827972a8868 (diff)
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 <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>
Diffstat (limited to 'Kbuild')
-rw-r--r--Kbuild18
1 files changed, 9 insertions, 9 deletions
diff --git a/Kbuild b/Kbuild
index 51f7433bb3d..465b930f625 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__)