Again, just FYI, with a simpler example, and with -march=native replaced by k8 or athlon64.
Source code: int main(void) { static int foo[4]; int i; for (i = 0; i < 4; i++) foo[i] = 0; return 0; } Compile and run, using Cygwin's current gcc version 4.3.4: gcc -O3 -march=athlon64 foobar.c ./a.exe Segmentation fault (core dumped) -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple