Makefile: Update unmodified config-devices.mak automatically
This makes rebuilds after source updates easier
for most users (who don't edit config-devices.mak).
Signed-off-by: Stefan Weil <weil@mail.berlios.de>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/Makefile b/Makefile
index 1f284ae..20c4e56 100644
--- a/Makefile
+++ b/Makefile
@@ -42,12 +42,22 @@
%/config-devices.mak: default-configs/%.mak
$(call quiet-command,cat $< > $@.tmp, " GEN $@")
- @if test -f $@ ; then \
- echo "WARNING: $@ out of date." ;\
- echo "Run \"make defconfig\" to regenerate." ; \
- rm $@.tmp ; \
+ @if test -f $@; then \
+ if cmp -s $@.old $@ || cmp -s $@ $@.tmp; then \
+ mv $@.tmp $@; \
+ cp -p $@ $@.old; \
+ else \
+ if test -f $@.old; then \
+ echo "WARNING: $@ (user modified) out of date.";\
+ else \
+ echo "WARNING: $@ out of date.";\
+ fi; \
+ echo "Run \"make defconfig\" to regenerate."; \
+ rm $@.tmp; \
+ fi; \
else \
- mv $@.tmp $@ ; \
+ mv $@.tmp $@; \
+ cp -p $@ $@.old; \
fi
defconfig:
