--- a/make/autoconf/boot-jdk.m4	Tue Nov 21 17:39:04 2017 +0100
+++ b/make/autoconf/boot-jdk.m4	Tue Dec 05 14:10:11 2017 +0100
@@ -353,9 +353,6 @@
 
   AC_MSG_CHECKING([flags for boot jdk java command] )
 
-  # Disable special log output when a debug build is used as Boot JDK...
-  ADD_JVM_ARG_IF_OK([-XX:-PrintVMOptions -XX:-UnlockDiagnosticVMOptions -XX:-LogVMOutput],boot_jdk_jvmargs,[$JAVA])
-
   # Force en-US environment
   ADD_JVM_ARG_IF_OK([-Duser.language=en -Duser.country=US],boot_jdk_jvmargs,[$JAVA])