[llvm-bugs] [Bug 47302] New: mingw-w64: std::wcout after _setmode(_fileno(stdout), _O_WTEXT) doesn't work

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47302

            Bug ID: 47302
           Summary: mingw-w64: std::wcout after _setmode(_fileno(stdout),
                    _O_WTEXT) doesn't work
           Product: libc++
           Version: 10.0
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: nguyen.long.908132 at gmail.com
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com

Take this code snippet:
#include <iostream>
#include <io.h>
#include <fcntl.h>

int wmain(int argc, const wchar_t* argv[])
{
    _setmode(_fileno(stdout), _O_WTEXT);
    std::wcout << L"Thử nghiệm\n";
    return 0;
}

On MS STL, this correctly outputs the string, but on libc++ it outputs nothing.

Additional notes:
Add -municode when compiling with clang, and add /utf-8 when compiling with
MSVC

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