Isolated emscripten in new lib

lib/emscripten/emtests/test_reinterpreted_ptrs.c

@@ -0,0 +1,47 @@
+/*
+ * Copyright 2016 The Emscripten Authors.  All rights reserved.
+ * Emscripten is available under two separate licenses, the MIT license and the
+ * University of Illinois/NCSA Open Source License.  Both these licenses can be
+ * found in the LICENSE file.
+ */
+
+#include <stdio.h>
+
+class Foo {
+ private:
+  float bar;
+
+ public:
+  int baz;
+
+  Foo() : bar(0), baz(4711) {};
+
+  int getBar() const;
+};
+
+int Foo::getBar() const {
+  return this->bar;
+};
+
+const Foo *magic1 = reinterpret_cast<Foo *>(0xDEAD111F);
+const Foo *magic2 = reinterpret_cast<Foo *>(0xDEAD888F);
+
+static void runTest() {
+
+  const Foo *a = new Foo();
+  const Foo *b = a;
+
+  if (a->getBar() == 0) {
+    if (a->baz == 4712)
+      b = magic1;
+    else
+      b = magic2;
+  }
+
+  printf("%s\n",
+         (b == magic1 ? "magic1" : (b == magic2 ? "magic2" : "neither")));
+};
+
+extern "C" {
+int main(int argc, char **argv) { runTest(); }
+}