+#ifdef ENABLE_VALGRIND_CHECKING
+# ifdef HAVE_VALGRIND_MEMCHECK_H
+# include <valgrind/memcheck.h>
+# elif defined HAVE_MEMCHECK_H
+# include <memcheck.h>
+# else
+# include <valgrind.h>
+# endif
+/* Compatibility macros to let valgrind 3.1 work. */
+# ifndef VALGRIND_MAKE_MEM_NOACCESS
+# define VALGRIND_MAKE_MEM_NOACCESS VALGRIND_MAKE_NOACCESS
+# endif
+# ifndef VALGRIND_MAKE_MEM_DEFINED
+# define VALGRIND_MAKE_MEM_DEFINED VALGRIND_MAKE_READABLE
+# endif
+# ifndef VALGRIND_MAKE_MEM_UNDEFINED
+# define VALGRIND_MAKE_MEM_UNDEFINED VALGRIND_MAKE_WRITABLE
+# endif
+#else
+/* Avoid #ifdef:s when we can help it. */
+#define VALGRIND_DISCARD(x)
+#define VALGRIND_MALLOCLIKE_BLOCK(w,x,y,z)
+#define VALGRIND_FREELIKE_BLOCK(x,y)
+#endif
+
+/* In LTO -fwhole-program build we still want to keep the debug functions available
+ for debugger. Mark them as used to prevent removal. */
+#if (GCC_VERSION > 4000)
+#define DEBUG_FUNCTION __attribute__ ((__used__))
+#define DEBUG_VARIABLE __attribute__ ((__used__))
+#else
+#define DEBUG_FUNCTION
+#define DEBUG_VARIABLE
+#endif
+