Hello, can anyone tell me how to use option -m64 in g++ (GCC) 3.4.3 20050227 (Red Hat 3.4.3-22.1)? when I input the command line: >g++ -m64 -o test test.cc error message was output: /tmp/ccyjpGIh.o(.text+0x900): In function `main': : relocation truncated to fit: R_X86_64_32 . . . best regards __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com