Emulated versus paravirtualized build daemons

There has been a few flam^Wdiscussions about emulated build daemons, each time coming to the conclusion that we should not upload packages built on an emulated machine to the archive.

However Debian has started to use at least one paravirtualized (Xen) build daemon, the i386 experimental one. The result is that one of the tests of the GNU libc testsuite is failing. On the other hand, the GNU libc and the GCC testsuites are giving the same results on a QEMU emulated machine and a real machine, for amd64, arm, armel, i386, mips, mipsel and powerpc. Same for KVM on amd64 and i386.

I wonder if we made the right choice


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