mkmf.rb: defer use of instance variable

* lib/mkmf.rb (MakeMakefile#dir_config, MakeMakefile#_libdir_basename):
  defer use of instance variable until needed.  [Bug #8074]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39717 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 14 insertions, 0 deletions

diff --git a/test/mkmf/test_config.rb b/test/mkmf/test_config.rb
new file mode 100644
index 0000000000..c0b2355ee1
--- /dev/null
+++ b/test/mkmf/test_config.rb
@@ -0,0 +1,14 @@
+require 'test/unit'
+require 'mkmf'
+require_relative '../ruby/envutil'
+
+class TestMkmf
+  class TestConfig < Test::Unit::TestCase
+    def test_dir_config
+      bug8074 = '[Bug #8074]'
+      assert_separately %w[-rmkmf - -- --with-foo-dir=/test/foo], %{
+        assert_equal(%w[/test/foo/include /test/foo/lib], dir_config("foo"), #{bug8074.dump})
+      }
+    end
+  end
+end