From dd3b39955c03b0df134f854fcc491f4f5451f75b Mon Sep 17 00:00:00 2001
From: Daniel White <daniel@whitehouse.id.au>
Date: Sat, 18 Jan 2014 15:28:55 +1100
Subject: Add DIALYZER_PLT variable

This is useful for optionally sharing a PLT amongst projects or
dependencies.
---
 README.md | 2 ++
 erlang.mk | 8 +++++---
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/README.md b/README.md
index 22cb2bf..bec67d9 100644
--- a/README.md
+++ b/README.md
@@ -191,6 +191,8 @@ then you only need to put `ponies` in the list.
 `stdlib` in there because they will always be included. The applications
 the project depends on will also be included.
 
+`DIALYZER_PLT` allows you to change the PLT file used by dialyzer.
+
 `DIALYZER_OPTS` allows you to change the `dialyzer` options.
 
 `PKG_FILE` allows you to change the location of the package index file
diff --git a/erlang.mk b/erlang.mk
index 1e0a05e..f7cc405 100644
--- a/erlang.mk
+++ b/erlang.mk
@@ -251,16 +251,18 @@ tests: clean deps app build-tests
 
 # Dialyzer.
 
+DIALYZER_PLT ?= $(CURDIR)/.$(PROJECT).plt
+export DIALYZER_PLT
+
 PLT_APPS ?=
 DIALYZER_OPTS ?= -Werror_handling -Wrace_conditions \
 	-Wunmatched_returns # -Wunderspecs
 
 build-plt: deps app
-	@dialyzer --build_plt --output_plt .$(PROJECT).plt \
-		--apps erts kernel stdlib $(PLT_APPS) $(ALL_DEPS_DIRS)
+	@dialyzer --build_plt --apps erts kernel stdlib $(PLT_APPS) $(ALL_DEPS_DIRS)
 
 dialyze:
-	@dialyzer --src src --plt .$(PROJECT).plt --no_native $(DIALYZER_OPTS)
+	@dialyzer --src src --no_native $(DIALYZER_OPTS)
 
 # Packages.
 
-- 
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