https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61123
--- Comment #4 from Hale Wang <Hale.Wang at arm dot com> --- (In reply to Richard Biener from comment #3) > It seems that Tag_ABI_PCS_wchar_t is emitted from the C-family frontends only > via config/arm/arm-c.c (as opposed to any other Tags). Probably because > the option is c-family specific. This code needs to move to generic handling > (the option enum is shared across all frontends, so that's not a reason to > keep it in a C specific file). Thanks very much for your comments. So this seems to be a separate issue that the Tag_ABI_PCS_wchar_t need to be moved to LTO frontend at least,but not only the C frontend. May be I need to creat another patch or bug description for this issue.