https://gcc.gnu.org/bugzilla/show_bug.cgi?id=49973
--- Comment #17 from joseph at codesourcery dot com <joseph at codesourcery dot com> --- On Tue, 17 Sep 2019, lhyatt at gmail dot com wrote: > In any case, the underlying source of wcwidth() could easily be changed as a > drop-in replacement so I guess it can also be decided later. The use of > mbrtowc() is the bigger problem, since this converts from the user's locale > and > it needs to convert from what -finput-charset asked for (or else UTF-8) > instead. If __STDC_ISO_10646__ is defined, wchar_t is Unicode and so local code converting from UTF-8 to wchar_t can be used (together with wcwidth from libc if available). If __STDC_ISO_10646__ is not defined, the encoding of wchar_t is unknown. Maybe in that case it's best to avoid libc's wcwidth (if any) and just use a local implementation of wcwidth on the results of converting UTF-8 to Unicode code points.
