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I'm trying to write Japanese to a file using wofstream and wstring. Unfortunately, wofstream doesn't write Japanese characters to the file when compiled with g++ or clang++ (in WSL and Windows 10 ) with no additional flags.

#include <fstream>
int main() {
    std::wofstream file("file.txt");
    std::wstring str = L"Onee-chan, Ohayou!";
    file << str;
file.txt
Onee-chan, Ohayou!
#include <fstream>
int main() {
    std::wofstream file("file.txt");
    std::wstring str = L"お姉ちゃん、おはよう！";
    file << str;
file.txt has 0 bytes of size.
BUT when compiled with MSVC with the following code,
#include <fstream>
int main() {
    std::ofstream file("file.txt");
    std::string str = "お姉ちゃん、おはよう！";
    file << str;
file.txt has:

お姉ちゃん、おはよう！
Want my application to run on both linux and Windows. It works on windows with msvc (using string, char and fstreams [that's good]). I don't think MSVC is on linux, therefore I tried using wstring, wchat_t and wfstreams with g++ (in WSL and Windows cmd) but they don't write Japanese to the files.
Any suggestions on how to get through this.
(For Example: msvc like settings for g++(preferred) or any changes in the code(not preferred))
                Adding std::locale::global(std::locale("")); at the start of main fixed it for me. So does file.imbue(std::locale("")); (after you define file of course).
– mediocrevegetable1
                Sep 28, 2021 at 5:36
                Does this have to be using wide strings with GCC? Making everything UTF-8 and using a regular std::string (or something that actually conveys that info) seems like the more workable option.
– chris
                Sep 28, 2021 at 5:41
                AFAIK std::wstring is not the Unicode string in Linux, try using std::string and std::ofstream instead and see if that makes a change.
– Ruks
                Sep 28, 2021 at 5:47