Added better clean targets

Author: mmottl

Makefile

@@ -6,6 +6,7 @@ all:
 
 clean:
 	@dune clean
+	@make -C lib clean-compile-commands
 
 doc:
 	@dune build @doc

lib/Makefile

@@ -1,13 +1,15 @@
 TARGETS = postgresql.cma libpostgresql_stubs.a
 
-.PHONY: all clean
+.PHONY: all clean clean-compile-commands
 
 all: compile_commands.json
 	@dune build $(TARGETS)
 
-clean:
+clean: clean-compile-commands
 	@dune clean
-	@rm -f compile_commands.json
 
 compile_commands.json: config/dune config/discover.ml postgresql_stubs.c
 	@dune rules | dune-compiledb
+
+clean-compile-commands:
+	@rm -f compile_commands.json