ctags and cscope support to Makefile

Summary: Added a target to Makefile called 'tags' that runs ctags and cscope on all *.cc and *.h file

Test Plan:
Run 'make tags'. Then start vim and do
:set tags=./tags
:cs add cscope.out

These commands should give you no error messages. You should then be able to access cscope db and ctags as normal in vim.

Reviewers: dhruba

Differential Revision: https://reviews.facebook.net/D11103

Makefile

@@ -262,6 +262,11 @@ sst_dump: tools/sst_dump.o $(LIBOBJECTS)
 ldb: tools/ldb.o $(LIBOBJECTS)
 	$(CXX) tools/ldb.o $(LIBOBJECTS) $(EXEC_LDFLAGS) -o $@ $(LDFLAGS)
 
+.PHONY: tags
+tags:
+	ctags `find . -name '*.cc'` `find . -name '*.h'`
+	cscope -b `find . -name '*.cc'` `find . -name '*.h'`
+
 ifeq ($(PLATFORM), IOS)
 # For iOS, create universal object files to be used on both the simulator and
 # a device.