Fabrice> Hi, This is the patch I come with after updating to the Fabrice> latest 21.2b13. It allows fastcall compilation (-Gr) and Fabrice> compiling with -O2x. The resulting xemacs.exe has not yet Fabrice> crashed, even using gnus quite intensively. Fabrice> I'm not sure at all the few __cdecl I have added are Fabrice> right. They should probably be added using some macro, but I Fabrice> have not found which one. Any clue ? There doesn't seem to be a pre-defined MSVC macro for conditionally setting __cdecl. <types.h> contains the following: #ifndef CDECL #define CDECL _cdecl #endif It might be better to do something like: #if MSVC_FASTCALL #define X_CDECL __cdecl #else #define X_CDECL #endif /* ... */ static SIGTYPE X_CDECL alarm_signal (int signo) or even make a config option (`--with-msvc-fastcall' ?). Cheers, -- Sam Mikes smikes(a)alumni.hmc.edu