TAGS: new Makefile target.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

.gitignore

+TAGS
 .depends
 *.d
 *.o

Makefile

@@ -122,6 +122,11 @@ inter-depends: $(ALL_DEPENDS) Makefile
 test-depends: $(ALL_DEPENDS) Makefile
 	for f in $(ALL_DEPENDS); do echo check-`basename \`dirname $$f\``: `sed -n 's,ccan/\(.*\),check-\1,p' < $$f`; done > $@
 
+TAGS: FORCE
+	find * -name '*.[ch]' | xargs etags
+
+FORCE:
+
 # Ensure we don't end up with empty file if configurator fails!
 config.h: tools/configurator/configurator Makefile Makefile-ccan
 	tools/configurator/configurator $(CC) $(CCAN_CFLAGS) > $@ || rm -f $@