diff options
| -rw-r--r-- | Makefile | 20 |
1 files changed, 15 insertions, 5 deletions
@@ -42,12 +42,22 @@ config-all-devices.mak: $(SUBDIR_DEVICES_MAK) %/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 $@.tmp, " GEN $@") - @if test -f $@ ; then \ - echo "WARNING: $@ out of date."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then \ + mv $@.tmp $@; \ + cp -p $@ $@.old; \ + else \ + if test -f $@.old; then \ + echo "WARNING: $@ (user modified) out of date.";\ + else \ + echo "WARNING: $@ out of date.";\ + fi; \ + echo "Run \"make defconfig\" to regenerate."; \ + rm $@.tmp; \ + fi; \ else \ - mv $@.tmp $@ ; \ + mv $@.tmp $@; \ + cp -p $@ $@.old; \ fi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: |