Le Ton Chanh <letonchanh@xxxxxxxxx> writes: > I added a new C library (*.h file) into GCC source in directory > $(GCC_ROOT)/gcc and it is used in haifa-sched.c and final.c. But > when I built GCC, it warmed "undefined reference to ...". How can I > fix this? Impossible to say with the amount of information you provided. Is there a new .c file? Did you add the corresponding .o file to OBJS-common in gcc/Makefile.in, or whereever it should go? > The second question, I want to add 'nop' instruction after an > instruction in assembly source file generated by cc1 when the > schedule queued for 1 cycles for the insn respectively. Does GCC > support that? Sure, but it's not trivial to implement. The MIPS backend does stuff like that when compiling for the MIPS 1 ISA. It's done in the machine reorg pass. The code is in config/mips/mips.c, in mips_reorg_process_insns. > I am using GCC 3.3.4. Thanks in advance. That is quite old by now. Ian
