X-Git-Url: https://git.kernelconcepts.de/?p=karo-tx-uboot.git;a=blobdiff_plain;f=Kbuild;h=e2e3b2995f16ef68abaef1d15acd8d4aa1ef6eb4;hp=51f7433bb3d775635aaaded263fcaf998879f460;hb=9e4e2adbbc4e73d3ea0fdeeede5f297b698492c6;hpb=f73513c97454918294e77c31c8d36ef1843001ff

diff --git a/Kbuild b/Kbuild
index 51f7433bb3..e2e3b2995f 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
 
 #####
@@ -35,16 +36,15 @@ endef
 generic-offsets-file := include/generated/generic-asm-offsets.h
 
 always  := $(generic-offsets-file)
-targets := $(generic-offsets-file) lib/asm-offsets.s
+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 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
@@ -55,7 +55,6 @@ offsets-file := include/generated/asm-offsets.h
 endif
 
 always  += $(offsets-file)
-targets += $(offsets-file)
 targets += arch/$(ARCH)/lib/asm-offsets.s
 
 CFLAGS_asm-offsets.o := -DDO_DEPS_ONLY
@@ -65,5 +64,5 @@ 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__)