#856 regressed again on debug build due to absl::InitializeLog() in Windows

[yukawa]

Description

In short, acaa7af reintroduced the following issue as it internally triggers RoInitialize().

• Applications that do not explicitly call CoInitialize may crash when loading or enabling Mozc in Windows #856

Steps to reproduce

Steps to reproduce the behavior:

1. Create and install a debug version of Mozc64.msi
2. Build and launch the following app.
3. Select Mozc

#include <windows.h>

int WINAPI wWinMain(HINSTANCE instance_handle, HINSTANCE prev_instance_handle,
                    PWSTR command_line, int command_show) {
  const wchar_t window_class_name[] = L"Test Window Class";
  {
    const WNDCLASS wc = {
        .lpfnWndProc = [](HWND window_handle, UINT message,
                          auto... params) -> LRESULT {
          if (message == WM_DESTROY) {
            ::PostQuitMessage(0);
            return 0;
          }
          return ::DefWindowProc(window_handle, message, params...);
        },
        .hInstance = instance_handle,
        .hbrBackground = (HBRUSH)(COLOR_WINDOW + 1),
        .lpszClassName = window_class_name,
    };
    ::RegisterClass(&wc);
  }

  const HWND window_handle = ::CreateWindowEx(
      0, window_class_name, L"Window Title", WS_OVERLAPPEDWINDOW, CW_USEDEFAULT,
      CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, nullptr, nullptr,
      instance_handle, nullptr);

  if (window_handle == nullptr) {
    return 0;
  }

  ::ShowWindow(window_handle, command_show);

  while (true) {
    MSG message = {};
    if (::GetMessage(&message, nullptr, 0, 0) <= 0) {
      break;
    }
    ::TranslateMessage(&message);
    ::DispatchMessage(&message);
  }

  return 0;
}

Expected behavior

The test app does not crash at the step 3.

Actual behavior

The test app crashes at the step 3.

Version or commit-id

1d74ac4

Environment

• OS: Windows 11 23H2

Additional context

This does not affect release build as it is guarded with NDEBUG.

mozc/src/base/log_file.cc

Lines 66 to 71 in 1d74ac4

	void RegisterLogFileSink(const std::string &path) {
	#if !defined(NDEBUG) && !defined(__ANDROID__)
	absl::InitializeLog();
	absl::AddLogSink(new LogFileSink(path));
	#endif // !NDEBUG && !__ANDROID__
	}