Fix lx_hybrid_ctors test for Ubuntu 11.10

On Ubuntu 11.10 the host library created for the 'lx_hybrid_ctors' test
doesn't get loaded, because the test object in the library is not being
used by the application. This commit fixes the problem by having the
application call a dummy function in the library.

Fixes #120.

base-linux/src/test/lx_hybrid_ctors/main.cc

@@ -14,6 +14,8 @@
 
 #include <base/printf.h>
 
+#include "testlib.h"
+
 using namespace Genode;
 
 
@@ -23,16 +25,27 @@ struct Testapp_testclass
 	{
 		Genode::printf("Global static constructor of Genode application called\n");
 	}
+
+	void dummy() { }
 };
 
 
-Testapp_testclass testapp_testclass;
+extern Testlib_testclass testlib_testobject;
+
+Testapp_testclass testapp_testobject;
 
 
 int main(int argc, char *argv[])
 {
 	printf("--- lx_hybrid global static constructor test ---\n");
 
+	/*
+	 * Call a dummy function on each test object to make sure that the
+	   objects don't get optimized out.
+	 */
+	testlib_testobject.dummy();
+	testapp_testobject.dummy();
+
 	printf("--- returning from main ---\n");
 
 	return 0;

base-linux/src/test/lx_hybrid_ctors/testlib.cc

@@ -13,12 +13,16 @@
 
 #include <stdio.h>
 
-struct Testlib_testclass
-{
-	Testlib_testclass()
-	{
-		printf("[init -> test-lx_hybrid_ctors] Global static constructor of host library called.\n");
-	}
-};
+#include "testlib.h"
 
-Testlib_testclass testlib_testclass;
+
+Testlib_testclass::Testlib_testclass()
+{
+	printf("[init -> test-lx_hybrid_ctors] Global static constructor of host library called.\n");
+}
+
+
+void Testlib_testclass::dummy() { }
+
+
+Testlib_testclass testlib_testobject;

base-linux/src/test/lx_hybrid_ctors/testlib.h

@@ -0,0 +1,18 @@
+/*
+ * \brief  Test if global static constructors in host shared libs get called
+ * \author Christian Prochaska
+ * \date   2011-11-24
+ */
+
+/*
+ * Copyright (C) 2011-2012 Genode Labs GmbH
+ *
+ * This file is part of the Genode OS framework, which is distributed
+ * under the terms of the GNU General Public License version 2.
+ */
+
+struct Testlib_testclass
+{
+	Testlib_testclass();
+	void dummy();
+};