I defined macro FUNCTION_ARG and other macros in section "Passing Arguments in Registers" of GCCInt to pass args in regs. It compiled OK, but when I use the number of args greater than the number regs in macro FUNCTION_ARG_REGNO_P, it crashes with notice: "internal compiler error: Segmentation fault". How can I fixed this bug? Thanks so much for your help. Le Ton Chanh email:letonchanh at yahoo dot com