Hi Tom,
the answer to the segfaults is given there in https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=738575
It just depends on, that the Quark x1000 processor has not the full i686 instruction set.
Also is mentioned there, that a compile of the debian source files with -march=i586
works. In qemu to use i486 processor gives an error, because the PAE is not in the instruction set of i486.
I dont know, if any version of the GCC compiler has now the quark processor as its own,
greetings from Ilsede,
Dietmar