The config-system of xshipwars issues a "-march=i686" flags on i686-based system _after_ the user's CFLAGS. This results in a downgrade if the user's CFLAGS contains e.g. "-march=pentium3" and prohibits the use of "-fprefetch-loop-arrays" and similiar flags. The problem lies in the file platform.ini in the components' subdirectories.
at first i thought this was *ok* then i realized that this would bugger up builds on machines for other ARCH's ...
ok, should be all set now http://cvs.gentoo.org/cgi-bin/viewcvs.cgi/gentoo-x86/app-games/xshipwars/xshipwars-1.34.0.ebuild.diff?r1=1.9&r2=1.10