I have two programs that when compiled under the latest version of g++: gcc version 4.1.1 20061011 (Red Hat 4.1.1-30) work perfectly under FC6 but give the error 'Floating point exception' when run under FC5. (The version of g++ in FC5 is 4.1.1 20060525 (Red Hat 4.1.1.-1) When one runs a gdb (in FC5) on either program you get: (gdb) run Starting program: prepdata Reading symbols from shared object read from target memory...done. Loaded system supplied DSO at 0x9c8000 Program received signal SIGFPE, Arithmetic exception. 0x00ad2396 in do_lookup_x () from /lib/ld-linux.so.2 (gdb) where #0 0x00ad2396 in do_lookup_x () from /lib/ld-linux.so.2 #1 0x00ad2719 in _dl_lookup_symbol_x () from /lib/ld-linux.so.2 #2 0x00ad3eca in _dl_relocate_object () from /lib/ld-linux.so.2 #3 0x00acc840 in dl_main () from /lib/ld-linux.so.2 #4 0x00adc6f7 in _dl_sysdep_start () from /lib/ld-linux.so.2 #5 0x00aca2b6 in _dl_start () from /lib/ld-linux.so.2 #6 0x00ac9847 in _start () from /lib/ld-linux.so.2 which seems to be some type of load error, since the program doesn't seem to have started yet. When compiled under FC5 g++, the program also works properly. The FC6 machine is an Intel Core 2 Duo, the FC5 machines have Intel 950 (Dual core) chips and are running smp kernels. Is this an incompatibility? - a bug? __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com