Hi all, There are more cases of signed integer overflows in the CPython source code base... That's on a 64-bits machine: [GCC 4.1.2 20060715 (prerelease) (Debian 4.1.1-9)] on linux2 abs(-sys.maxint-1) == -sys.maxint-1 I'd expect the same breakage everywhere when GCC 4.2 is used. Note that the above is Python 2.4.4c0 - apparently Python 2.3 compiled with GCC 4.1.2 works, although that doesn't make much sense to me because intobject.c didn't change here - 2.3, 2.4, 2.5, trunk are all the same. Both tested Pythons are Debian packages, not in-house compiled. Humpf! Looks like one person or two need to do a quick last-minute review of all places trying to deal with -sys.maxint-1, and replace them all with the "official" fix from Tim [SF 1545668]. A bientot, Armin