change dialyzer Makefile targets to handle known warnings

At the suggestion of Tuncer Ayaz, modify the dialyzer targets to use the
new known_dialyzer_warnings file to ignore all known dialyzer warnings.

.gitignore

@@ -68,3 +68,4 @@ ebin/yaws.appup
 etc
 yaws_logs
 rel/yaws
+dialyzer_warnings

Makefile

@@ -79,7 +79,7 @@ touch:
 	find . -name '*.erl' -print | xargs touch -m
 
 yaws.plt:
-	dialyzer --build_plt -r . --output_plt yaws.plt \
+	dialyzer --build_plt -r ebin src --output_plt yaws.plt \
 	   -r $(ERLDIR)/lib/sasl-$(SASL_VSN) \
 	   -r $(ERLDIR)/lib/kernel-$(KERNEL_VSN) \
 	   -r $(ERLDIR)/lib/stdlib-$(STDLIB_VSN) \
@@ -89,7 +89,8 @@ yaws.plt:
 #   	   -r $(ERLDIR)/lib/ssl-$(SSL_VSN)
 
 dialyzer:	yaws.plt
-	dialyzer --plt yaws.plt -r .
+	-dialyzer -q --plt yaws.plt -r ebin src > dialyzer_warnings
+	diff -U0 known_dialyzer_warnings dialyzer_warnings
 
 .PHONY: test
 test:

known_dialyzer_warnings

@@ -0,0 +1,16 @@
+
+yaws.erl:1858: The pattern 'false' can never match the type 'true'
+yaws.erl:2366: Guard test Ret::'file' == 'fd' can never succeed
+yaws.erl:2374: Guard test Ret::'file' == 'binfd' can never succeed
+yaws_api.erl:470: The pattern <Data, ParseState = {'mp_parse_state', 'start_header', _, _, _, _}, Acc, [], []> can never match the type <_,#mp_parse_state{state::'header'},_,[any()],[{atom() | [any()],[any()]}]>
+yaws_config.erl:464: The pattern 'false' can never match the type 'true'
+yaws_ctl.erl:530: Function hup/1 has no local return
+yaws_ctl.erl:535: Function stop/1 has no local return
+yaws_ctl.erl:539: Function status/1 has no local return
+yaws_ctl.erl:542: Function load/1 has no local return
+yaws_ctl.erl:564: Function trace/1 has no local return
+yaws_ctl.erl:567: Function debug_dump/1 has no local return
+yaws_ctl.erl:570: Function stats/1 has no local return
+yaws_ctl.erl:572: Function running_config/1 has no local return
+yaws_revproxy.erl:523: The pattern 'true' can never match the type 'false'
+yaws_sup_restarts.erl:49: The pattern 'false' can never match the type 'true'