These two functions initialize and delete global static data structures. The references to these symbols are generated in each gcc file and they are, imo, necessary in order to run C code because gcc assumes that the variables are initialized on program start. The functions are defined in avr-libc's crt function and in libgcc (part of the compiler itself.).
If you want to write your own initialization routines: Go ahead and define a dummy assembler file .text .global __do_clear_bss .global __do_copy_data __do_copy_data __do_clear_bss And ld will no longer use the code from the libraries. But better be careful. Bjoern. -----Ursprüngliche Nachricht----- Von: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Im Auftrag von maha Gesendet: Montag, 27. März 2006 09:00 An: [email protected] Betreff: [avr-gcc-list] AVR-GCC--linker problems Hello~ I have a little questions about avr-gcc... What's the functions about "__do_clear_bss" and "__do_copy_data"? Do I have to use them? Do I have other ways can replce them?( disappear them in my test.o ) Because I have to link and relocate symbols by myself. But, I don't know how to link symbols that references to libraries. Can I pass test.o back to AVR-GCC and handles libraries linking after done my work?( complete relocatable symbols' linking ) And, where can I find more informations about this question? ./nm test.o ( compiled but no linking ) 00000000 a *ABS* 0000003e a __SP_H__ 0000003d a __SP_L__ 0000003f a __SREG__ U __do_clear_bss <--\ U __do_copy_data <---- How to take them away and has no effect 00000000 a __tmp_reg__ function about test.o 00000001 a __zero_reg__ 00000008 T cleanup_module or 00000000 T init_module U ker_led <--Can I pass this test.o back to avr-gcc to handles __do_clear_bss and __do_copy_data after linking ker_led by myself ? Help me please, Thanks a lot~ Wang~ -- View this message in context: http://www.nabble.com/AVR-GCC--linker-problems-t1347495.html#a3604813 Sent from the AVR - gcc forum at Nabble.com. _______________________________________________ AVR-GCC-list mailing list [email protected] http://lists.nongnu.org/mailman/listinfo/avr-gcc-list _______________________________________________ AVR-GCC-list mailing list [email protected] http://lists.nongnu.org/mailman/listinfo/avr-gcc-list
