Give ebin paths when creating the PLT

Before we had Dialyzer look for BEAM files in every subfolders
of every deps. This resulted in the PLT bundling extra files
and/or Dialyzer failing because some of them are not built with
+debug_info, or because there are duplicates (in test logs for
example). Now Dialyzer will only look in ebin/.

plugins/dialyzer.mk

@@ -42,8 +42,10 @@ define filter_opts.erl
 endef
 
 $(DIALYZER_PLT): deps app
-	$(verbose) dialyzer --build_plt --apps erts kernel stdlib $(PLT_APPS) $(OTP_DEPS) $(LOCAL_DEPS) \
-		`test -f $(ERLANG_MK_TMP)/deps.log && cat $(ERLANG_MK_TMP)/deps.log`
+	$(eval DEPS_LOG := $(shell test -f $(ERLANG_MK_TMP)/deps.log && \
+		while read p; do test -d $$p/ebin && echo $$p/ebin; done <$(ERLANG_MK_TMP)/deps.log))
+	$(verbose) dialyzer --build_plt --apps erts kernel stdlib \
+		$(PLT_APPS) $(OTP_DEPS) $(LOCAL_DEPS) $(DEPS_LOG)
 
 plt: $(DIALYZER_PLT)
 

test/plugin_dialyzer.mk

@@ -1,6 +1,6 @@
 # Dialyzer plugin.
 
-DIALYZER_CASES = app apps-only apps-with-local-deps beam check custom-plt deps erlc-opts local-deps opts plt-apps
+DIALYZER_CASES = app apps-only apps-with-local-deps beam check custom-plt deps erlc-opts local-deps opts plt-apps plt-ebin-only
 DIALYZER_TARGETS = $(addprefix dialyzer-,$(DIALYZER_CASES))
 
 ifneq ($(shell which sem 2>/dev/null),)
@@ -263,3 +263,31 @@ dialyzer-plt-apps: build clean
 
 	$i "Confirm that runtime_tools was included in the PLT"
 	$t dialyzer --plt_info --plt $(APP)/.$(APP).plt | grep -q runtime_tools
+
+dialyzer-plt-ebin-only: build clean
+
+	$i "Bootstrap a new OTP application named $(APP)"
+	$t mkdir $(APP)/
+	$t cp ../erlang.mk $(APP)/
+	$t $(MAKE) -C $(APP) -f erlang.mk bootstrap $v
+
+	$i "Add Cowlib to the list of dependencies"
+	$t perl -ni.bak -e 'print;if ($$.==1) {print "DEPS = cowlib\ndep_cowlib_commit = master\n"}' $(APP)/Makefile
+
+	$i "Build the application"
+	$t $(MAKE) -C $(APP) $v
+
+	$i "Run Cowlib tests to fetch autopatched dependencies"
+	$t $(MAKE) -C $(APP)/deps/cowlib tests $v
+
+	$i "Run Dialyzer"
+	$t $(DIALYZER_MUTEX) $(MAKE) -C $(APP) dialyze $v
+
+	$i "Check that the PLT file was created"
+	$t test -f $(APP)/.$(APP).plt
+
+	$i "Confirm that Cowlib was included in the PLT"
+	$t dialyzer --plt_info --plt $(APP)/.$(APP).plt | grep -q cowlib
+
+	$i "Confirm that rebar files were not included in the PLT"
+	$t ! dialyzer --plt_info --plt $(APP)/.$(APP).plt | grep -q rebar