diff -r f98a0ab24887 -r 0927d8c7296f src/hotspot/share/utilities/ostream.hpp
--- a/src/hotspot/share/utilities/ostream.hpp	Tue May 21 20:14:30 2019 -0700
+++ b/src/hotspot/share/utilities/ostream.hpp	Wed May 22 07:10:54 2019 +0200
@@ -42,6 +42,10 @@
 // This allows for redirection via -XX:+DisplayVMOutputToStdout and
 // -XX:+DisplayVMOutputToStderr
 class outputStream : public ResourceObj {
+ private:
+   outputStream(const outputStream&);
+   outputStream& operator=(const outputStream&);
+
  protected:
    int _indentation; // current indentation
    int _width;       // width of the page