http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59327
--- Comment #2 from Jorn Wolfgang Rennecke <amylaar at gcc dot gnu.org> --- sz is HOST_WIDE_INT, ASAN_RED_ZONE_SIZE is an int literal, and data.asan_alignb is an unsigned int. With 32 bit int and HOST_WIDE_INT, this results in a 32 bit signed/unsigned comparison. When building a target with need_64bit_hwint (according to config.gcc), on a host with 32 bit int, the right hand side of the comparison gets sign extended to HOST_WIDE_INT, thus the warning will not show up when testing such a combination / bootstrapping such a host/target.
