error: no member named 'cout' in namespace 'std'

[JayFoxRox]

While getting rid of my old GitHub notifications I noticed that I had an issue with lack of std::cout in the past, which became a problem while porting some projects.

This issue is basically a bug report for the workaround seen here: https://github.com/JayFoxRox/nxdk/tree/2c850026a565eea0435cb14370b0a9d8864cdd33/usr/share/nxdk/samples/ozz-animation
(I also briefly looked at the independent issue with #include <atomic> / std::atomic_int allocation_count_ / allocation_count_.store(0) / allocation_count_.load(), which appears to have been a problem back then, but it seems to be compile fine on XboxDev/nxdk@72485f4 / c594e97. I did not try running it though)

#include <hal/video.h>
#include <windows.h>

#include <iostream>

int main(void) {
  XVideoSetMode(640, 480, 32, REFRESH_DEFAULT);

  std::cout << "Hello!" << std::endl; // Does not compile: "error: no member named 'cout' in namespace 'std'"
  std::cerr << "Hello!" << std::endl; // Compiles

  while (true) {
    Sleep(2000);
  }

  return 0;
}

Not sure if we had discussed this in the past or if an issue already exists.

[JayFoxRox]

This will be caused by this:

nxdk-libcxx/include/__config

Lines 18 to 19 in c594e97

	#define _LIBCPP_HAS_NO_STDIN
	#define _LIBCPP_HAS_NO_STDOUT

which controls this:

nxdk-libcxx/include/iostream

Lines 48 to 59 in c594e97

	#ifndef _LIBCPP_HAS_NO_STDIN
	extern _LIBCPP_FUNC_VIS istream cin;
	extern _LIBCPP_FUNC_VIS wistream wcin;
	#endif
	#ifndef _LIBCPP_HAS_NO_STDOUT
	extern _LIBCPP_FUNC_VIS ostream cout;
	extern _LIBCPP_FUNC_VIS wostream wcout;
	#endif
	extern _LIBCPP_FUNC_VIS ostream cerr;
	extern _LIBCPP_FUNC_VIS wostream wcerr;
	extern _LIBCPP_FUNC_VIS ostream clog;
	extern _LIBCPP_FUNC_VIS wostream wclog;

I think that disabling cout is pointless, if there are also cerr and clog, which also go nowhere.
The nxdk libc also provides stdout (and stdin), so I don't think there's a good reason to disable it in C++.

With stdout / cout we can probably just ignore it. For stdin / cin we'll need a better solution probably.

nxdk will probably need a way to hook up virtual file descriptors for pdclib to handle this properly.
I assume it's possible to register a virtual filesystem through the kernel?
If that works, we could optionally connect stdout / stdin to debuggers via network (or similar).

Edit: Here are some links in how this works on Windows:

• https://docs.microsoft.com/en-us/windows/console/console-handles talks about CONIN$ and CONOUT$
• https://github.com/rprichard/win32-console-docs describes how it used to work and how it works now
• https://github.com/microsoft/terminal has some related code
• https://github.com/pspdev/pspsdk/blob/d019dbc7ecc198102229d0cdfe02976b6bef4e4d/src/debug/stdio.c is how PSPSDK does it for PSP