'catch SIGFPE in temacs' is safe in dump? Very old ChnageLog(included in emacs-20.2, not in xemacs-2x) says, 1986-06-06 Richard M. Stallman (rms at prep) * emacs.c (main): Don't call `signal' if in batch mode and not initialized and dumping is possible. * keyboard.c (init_keyboard): likewise for SIGIO. 1986-11-08 Richard M. Stallman (rms at prep) * data.c (init_data): Don't call signal if purifying. 1986-11-18 Richard M. Stallman (rms at prep) * dispnew.c (window_change_signal): New function to handle SIGWINCH, defined only if SIGWINCH is. Turned on in init_display if CANNOT_DUMP or if initialized. * data.c (init_data), editfns.c (init_editfns): Test initialized, not Vpurify_flag. Use explicit conditionals to avoid the test when CANNOT_DUMP. Another solution is to set the variables in C ,not in elisp, if FLT_RADIX, FLT_ROUNDS DBL_MANT_DIG, DBL_EPSILON, DBL_DIG, DBL_MIN_EXP, DBL_MIN, DBL_MIN_10_EXP DBL_MAX_EXP, DBL_MAX DBL_MAX_10_EXP (included from <float.h>) is usable for the purpose. SAKIYAMA Nobuo nobuo(a)db3.so-net.or.jp