http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50457
--- Comment #12 from Kazumoto Kojima <kkojima at gcc dot gnu.org> 2012-10-02 02:17:51 UTC --- (In reply to comment #11) > Created attachment 28321 [details] > cleanup libgcc/config/sh/linux-atomic Works fine for me. > (three leading underscores) You might get one extra underscore because embed-elf SH compiler uses one underscore as USER_LABEL_PREFIX. It's OK for linux which uses null USER_LABEL_PREFIX. I've got .long __sync_val_compare_and_swap_4 with sh4-unknown-linux-gnu gcc for that case.