mkmf.rb: larger constants

* lib/mkmf.rb (MakeMakefile#try_constant): fix for larger constants.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38907 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,4 +1,6 @@
-Wed Jan 23 16:16:14 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+Wed Jan 23 16:17:59 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* lib/mkmf.rb (MakeMakefile#try_constant): fix for larger constants.
 
 	* test/mkmf/test_constant.rb: tests for try_constant.
 	  TODO: define check_constant and use it.

lib/mkmf.rb

@@ -646,8 +646,17 @@ SRC
       src = %{#{includes}
 #include <stdio.h>
 /*top*/
-int conftest_const = (int)(#{const});
-int main() {printf("%d\\n", conftest_const); return 0;}
+typedef
+#ifdef PRI_LL_PREFIX
+#define PRI_CONFTEST_PREFIX PRI_LL_PREFIX
+LONG_LONG
+#else
+#define PRI_CONFTEST_PREFIX "l"
+long
+#endif
+conftest_type;
+conftest_type conftest_const = (conftest_type)(#{const});
+int main() {printf("%"PRI_CONFTEST_PREFIX"d\\n", conftest_const); return 0;}
 }
       begin
         if try_link0(src, opt, &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