Are there any improvements to make by building it with gcc-6 over gcc-4?
Some people have reported problems with newer compilers, one that comes to mind is -flto option seems
to fail to break the compile.
I don't have a GCC 6 build environment yet so I have no comparative performance data. It is my feeling there
would be little miner performance gain from compiler improvements because most miner optimizations use
ASM or intrinsic functions for the time critical code.
Feel free to try and report your results.