integrated terminal does not support std::thread output

Nobody has claimed this yet.

This issue was reported on the Python extension repo so I'm manually "transferring" it here: https://github.com/microsoft/vscode-python/issues/23639

Type: Bug

Version: 1.90.1 (user setup)
Commit: 611f9bfce64f25108829dd295f54a6894e87339d
Date: 2024-06-11T21:01:24.262Z
Electron: 29.4.0
ElectronBuildId: 9593362
Chromium: 122.0.6261.156
Node.js: 20.9.0
V8: 12.2.281.27-electron.0
OS: Windows_NT x64 10.0.22631

#include<thread>
#include<iostream>

void hello() {
    std::cout << "hello" << std::endl;
}

int main() {
    std::thread t{hello};
    t.join();
    return 0;
}

I write a simple program using std::thread, and compile it with g++.
This .exe file works fine in single cmd.exe, but does not print anything in integrated terminal in vscode
g++ comes from MinGW posix thread model

in external cmd, the a.exe can print "hello"
Snipaste_2024-06-19_20-22-02

but in integrated cmd, the a.exe doesn't print anything

and .exe works with a New Window VSCode

Extension version: 2024.6.0
VS Code version: Code 1.90.1 (611f9bfce64f25108829dd295f54a6894e87339d, 2024-06-11T21:01:24.262Z)
OS version: Windows_NT x64 10.0.22631
Modes:

System Info

Item	Value
CPUs	13th Gen Intel(R) Core(TM) i7-13700 (24 x 2112)
GPU Status	2d_canvas: enabled canvas_oop_rasterization: enabled_on direct_rendering_display_compositor: disabled_off_ok gpu_compositing: enabled multiple_raster_threads: enabled_on opengl: enabled_on rasterization: enabled raw_draw: disabled_off_ok skia_graphite: disabled_off video_decode: enabled video_encode: enabled vulkan: disabled_off webgl: enabled webgl2: enabled webgpu: enabled
Load (avg)	undefined
Memory (System)	63.68GB (49.66GB free)
Process Argv	--crash-reporter-id 35349f8c-5c73-4833-b906-6d9dd1538fcc
Screen Reader	no
VM	50%

A/B Experiments

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legacy_priority:31077528

Start by reproducing the C++ std::thread example with g++ using the MinGW POSIX thread model in the VS Code integrated cmd terminal, then compare it with external cmd.exe and a new VS Code window. Done means the executable prints "hello" consistently in the integrated terminal, with the relevant environment difference identified and covered by an appropriate regression check.

Written by the indexing model from the issue text.

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