The bug is not reproducible, so it is likely a hardware or OS problem.
make[4]: *** [kbattleship.all_cpp.o] Error 1
make[3]: *** [all-recursive] Error 1
make[2]: *** [all-recursive] Error 1
make[1]: *** [all-recursive] Error 1
make: *** [all] Error 2
 *
 * ERROR: kde-base/kbattleship-3.5.8 failed.
 * Call stack:
 *         ebuild.sh, line 1701:  Called dyn_compile
 *         ebuild.sh, line 1039:  Called qa_call 'src_compile'
 *         ebuild.sh, line   44:  Called src_compile
 *         ebuild.sh, line 1383:  Called kde-meta_src_compile
 *   kde-meta.eclass, line  380:  Called kde_src_compile
 *        kde.eclass, line  174:  Called kde_src_compile 'all'
 *        kde.eclass, line  344:  Called kde_src_compile 'myconf' 'configure' 'make'
 *        kde.eclass, line  340:  Called die
 * The specific snippet of code:
 *                              emake || die "died running emake, $FUNCNAME:make"
 *  The die message:
 *   died running emake, kde_src_compile:make
 *
 * If you need support, post the topmost build error, and the call stack if relevant.
 * A complete build log is located at '/var/tmp/portage/kde-base/kbattleship-3.5.8/temp/build.log'.
 *