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From: "carlos at redhat dot com" <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 20:59:42 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95048

Carlos O'Donell <carlos at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |carlos at redhat dot com

--- Comment #2 from Carlos O'Donell <carlos at redhat dot com> ---
(In reply to Jonathan Wakely from comment #1)
> This happens because glibc won't convert the wide string to UTF-8:
>=20
> #include <wchar.h>
> #include <assert.h>
>=20
> 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);
> }
>=20
> I'm not yet sure why glibc refuses to convert that.

ISO C says:

"At program startup, the equivalent of
setlocale(LC_ALL, "C");
is executed."

Which means you are trying to convert UTF-8 to ASCII.

You should call setlocale with a non-ASCII character set to make this work.=