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authorMichal Marek <mmarek@suse.cz>2015-03-11 11:01:01 +0100
committerMichal Marek <mmarek@suse.cz>2015-03-24 17:37:25 +0100
commit70a4fd6c56d0f581a63dffd8c31d180e96ecf6a6 (patch)
tree1a1640ae201a1d8faa2fd740a027cc8d699c28fe /Kbuild
parentc517d838eb7d07bbe9507871fab3931deccff539 (diff)
download96b-common-70a4fd6c56d0f581a63dffd8c31d180e96ecf6a6.tar.gz
kbuild: Don't reset timestamps in include/generated if not needed
Use filechk to generate asm-offsets.h and bounds.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>
Diffstat (limited to 'Kbuild')
-rw-r--r--Kbuild18
1 files changed, 9 insertions, 9 deletions
diff --git a/Kbuild b/Kbuild
index ab8ded92e870..96d062906c05 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 @@ kernel/bounds.s: kernel/bounds.c FORCE
$(Q)mkdir -p $(dir $@)
$(call if_changed_dep,cc_s_c)
-$(obj)/$(bounds-file): kernel/bounds.s Kbuild
- $(Q)mkdir -p $(dir $@)
- $(call cmd,offsets,__LINUX_BOUNDS_H__)
+$(obj)/$(bounds-file): kernel/bounds.s FORCE
+ $(call filechk,offsets,__LINUX_BOUNDS_H__)
#####
# 2) Generate asm-offsets.h
@@ -62,8 +62,8 @@ arch/$(SRCARCH)/kernel/asm-offsets.s: arch/$(SRCARCH)/kernel/asm-offsets.c \
$(Q)mkdir -p $(dir $@)
$(call if_changed_dep,cc_s_c)
-$(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s Kbuild
- $(call cmd,offsets,__ASM_OFFSETS_H__)
+$(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s FORCE
+ $(call filechk,offsets,__ASM_OFFSETS_H__)
#####
# 3) Check for missing system calls