After the latest patch of Richard's, qemu-system-x86_64 now runs GNU/Linux properly. The denorm problem is gone, and there seem to be no (or at least much fewer) spurious segfaults.
This ends a multi-month period of qemu-system-x86_64 instability. Still qemu-system-mips64, qemu-system-mips64el, and qemu-system-arm give spurious errors. The former two have never (at least not the last 3-4 years) been able to run a GMP configure && make && make check reliably. No regression there, just maintained buggyness... -- Torbjörn
