Output UTF-8 to Windows Shell

args.c

#include <wchar.h>
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <io.h>

int wmain(int argc, wchar_t** argv) {
    int i;

    _setmode(_fileno(stdout), _O_U8TEXT);

    fwprintf(stdout, L"args [%d]{", argc);
    for (i = 0; i < argc; i++) {
        fwprintf(stdout, L"(%d)'%ls', ", wcslen(argv[i]), argv[i]);
    }
    fwprintf(stdout, L"}\n");
    return 0;
}

Cygwin mintty w/ encoding = utf-8:

$ ./args.exe "Russland" Россия
args [3]{(35)'F:\cygwin\home\Timm Friebe\args.exe', (8)'Russland', (6)'Россия', }

Windows "cmd.exe" regardless of current codepage(!)

C:\> args.exe "Russland" Россия
args [3]{(8)'args.exe', (8)'Russland', (6)'Россия', }