1 files changed, 15 insertions, 0 deletions
diff --git a/test/mkmf/test_constant.rb b/test/mkmf/test_constant.rb
index bf5ff8c3f1..6628f7f0bc 100644
--- a/test/mkmf/test_constant.rb
+++ b/test/mkmf/test_constant.rb
@@ -14,5 +14,20 @@ class TestMkmf
       assert_equal(config_value("SIZEOF_VOIDP").to_i, mkmf {try_constant("sizeof(void*)")}, MKMFLOG)
       assert_equal(config_value("SIZEOF_VALUE").to_i, mkmf {try_constant("sizeof(Qnil)")}, MKMFLOG)
     end
+
+    def test_long
+      sizeof_int = config_value("SIZEOF_INT").to_i
+      sizeof_long = config_value("SIZEOF_LONG").to_i
+      if sizeof_long > sizeof_int
+        type = 'long'
+      else
+        sizeof_long_long = config_value("SIZEOF_LONG_LONG").to_i
+        return if !sizeof_long_long or sizeof_long_long <= sizeof_int
+        type = 'LONG_LONG'
+      end
+
+      decl = "#define CONFTEST_VALUE (unsigned #{type})(((unsigned #{type})1)<<(CHAR_BIT*sizeof(int)))"
+      assert_operator(mkmf {try_constant("CONFTEST_VALUE", [[decl]])}, :>, 0, MKMFLOG)
+    end
   end
 end