Porting/Xonotic

In progress

Xonotic does not build out of the box for POWER, because the Makefile uses the -march compiler flag, which does not exist on PowerPC. It can be fixed by replacing this line in the Makefile:

CFLAGS ?= -pipe -march=native -mtune=native -flto=auto

...with this line:

CFLAGS ?= -pipe -mcpu=native -mtune=native -flto=auto

After making this change, the build instructions should work.

Benchmarking

See instructions on using Xonotic as a benchmark.