RFR: 8030350: Enable additional compiler warnings for GCC

[Mike Duigou]

Hello all;

I've done some additional testing of my previous patch enabling additional GCC warnings for native code.

http://cr.openjdk.java.net/~mduigou/JDK-8030350/4/webrev/

With the switch to -Wformat=2 I found it necessary to add -Wno-error=format-nonliteral for hotspot as there are legitimate calls to sscanf that use a passed parameter.

In addition to review I still need a sponsor to push this to hotspot for me.

Thanks,

Mike