if use "hardened" useflag, current qemu-9999 ebuild add option --enable-user-pie (which is invalid) instead of valid --enable-pie. just change in line 133 "user-pie" to "pie"
If I could find this option (or have right to do it?), I would mark this as a duplicate of bug 394623.
Fix pushed with other improvements: > 21 Jan 2012; Sergei Trofimovich <slyfox@gentoo.org> qemu-9999.ebuild: > Fixed configure failure (follow upstream in renaming --enablble-user-pic to > --enable-pic). Added all missing linux targets except lm32 (needs proper deps > and a fix against --as-needed). Made ./configure params to be shown. Upstream now does -pie for qemu-system-* binaries as well. Does it play well on hardened? Thanks for the report!
*** Bug 395333 has been marked as a duplicate of this bug. ***