add var_append.mk
--- out.make 2015-04-02 16:09:16.418636676 +0900
+++ out.kati 2015-04-02 16:09:16.418636676 +0900
@@ -1,10 +1,10 @@
=== test ===
echo "simple FOO "
simple FOO
-echo "recursive FOO BAR"
-recursive FOO BAR
-echo "simple"
-simple
+echo "recursive FOO "
+recursive FOO
+echo "recursive"
+recursive
echo "recursive"
recursive
diff --git a/test/var_append.mk b/test/var_append.mk
new file mode 100644
index 0000000..5519299
--- /dev/null
+++ b/test/var_append.mk
@@ -0,0 +1,17 @@
+# TODO
+S:=simple
+R=recursive
+
+foo=FOO
+bar=
+
+S+=$(foo) $(bar)
+R+=$(foo) $(bar)
+
+bar=BAR
+
+test:
+ echo "$(S)"
+ echo "$(R)"
+ echo "$(flavor S)"
+ echo "$(flavor R)"