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> Gcc gets the similar problem. It only works without optimization. It seems > not a problem with gfortran. OK, then it'd be more appropriate to ask the mingw mailing-list or the generic gcc@gcc.gnu.org list. > GMP version is 4.2.2, and has been modified for x86_64. The original 4.2.2 > does not support x86_64-pc-mingw32. Does GMP pass tests? Have you built it with extra checking enabled? I don't suspect what you're seeing is a GMP problem, but you can never be too sure. > I do not have gdb for windows for the time being. That's why I gave you a download link for MS debuggers (I don't think gdb is supported on x86_64-mingw32). I'm not sure much can be done without a debugger. FX