[PATCH 0/4] fix build errors with gcc6

[Guido Trentalancia]

Hello.

The following set of four patches aims to fix the errors that occur
during compilation of openjdk8u with gcc6.

However, for some reason, the resulting java executables are not
usable, due to the following error:

Error occurred during initialization of VM
java.lang.NullPointerException
	at java.util.Hashtable.put(Hashtable.java:459)
	at java.lang.System.initProperties(Native Method)
	at java.lang.System.initializeSystemClass(System.java:1166)

Any help would be greatly appreciated, especially because this is the
first time I see this code...

I suppose some of the patches are trivial and can be applied easily
while others (in particular the last one, i.e. 4/4) would require more
revision and might be actually involved in the runtime crash.

Regards,

Guido