Improve the "dialyzer" target

Makefile.in

@@ -239,17 +239,32 @@ TAGS:
 
 Makefile: Makefile.in
 
-erlang.plt:
+deps := $(wildcard deps/*/ebin)
-	-dialyzer --build_plt --output_plt erlang.plt \
-	--apps kernel stdlib sasl crypto public_key ssl mnesia \
-	inets odbc tools compiler erts webtool runtime_tools asn1 \
-	observer xmerl et gs wx syntax_tools deps/*/ebin
 
-plt: erlang.plt
+dialyzer/erlang.plt:
+	@mkdir -p dialyzer
+	@dialyzer --build_plt --output_plt dialyzer/erlang.plt \
+	-o dialyzer/erlang.log --apps kernel stdlib sasl crypto \
+	public_key ssl mnesia inets odbc tools compiler erts webtool \
+	runtime_tools asn1 observer xmerl et gs wx syntax_tools; \
+	status=$$? ; if [ $$status -ne 2 ]; then exit $$status; else exit 0; fi
 
-dialyzer: plt
+dialyzer/deps.plt:
-	-dialyzer --plt erlang.plt --add_to_plt --output_plt ejabberd.plt \
+	@mkdir -p dialyzer
-	--get_warnings -o dialyzer.log ebin
+	@dialyzer --build_plt --output_plt dialyzer/deps.plt \
+	-o dialyzer/deps.log $(deps); \
+	status=$$? ; if [ $$status -ne 2 ]; then exit $$status; else exit 0; fi
+
+dialyzer/ejabberd.plt:
+	@mkdir -p dialyzer
+	@dialyzer --build_plt --output_plt dialyzer/ejabberd.plt \
+	-o dialyzer/ejabberd.log ebin; \
+	status=$$? ; if [ $$status -ne 2 ]; then exit $$status; else exit 0; fi
+
+dialyzer: dialyzer/erlang.plt dialyzer/deps.plt dialyzer/ejabberd.plt
+	@dialyzer --plts dialyzer/erlang.plt dialyzer/deps.plt dialyzer/ejabberd.plt \
+	--get_warnings -o dialyzer/error.log ebin; \
+	status=$$? ; if [ $$status -ne 2 ]; then exit $$status; else exit 0; fi
 
 test:
 	@echo "************************** NOTICE ***************************************"
@@ -257,5 +272,5 @@ test:
 	@echo "*************************************************************************"
 	$(REBAR) skip_deps=true ct
 
-.PHONY: src doc edoc dialyzer Makefile TAGS clean clean-rel distclean rel plt \
+.PHONY: src doc edoc dialyzer Makefile TAGS clean clean-rel distclean rel \
 	install uninstall uninstall-binary uninstall-all translations deps test spec