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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/95048] wstring-constructor of std::filesystem::path
 throws for non-ASCII characters
Date: Mon, 11 May 2020 20:49:31 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95048

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2020-05-11

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This happens because glibc won't convert the wide string to UTF-8:

#include <wchar.h>
#include <assert.h>

int main()
{
  const wchar_t wstr[] =3D L"=C3=A4";
  const wchar_t* from =3D wstr;
  char to[10];
  mbstate_t s;
  size_t res =3D wcsnrtombs(to, &from, 1, sizeof(to), &s);
  assert(res !=3D (size_t)-1);
}

I'm not yet sure why glibc refuses to convert that.=