#include <Windows.h>

#pragma comment (linker, "/INCLUDE:_tls_used")
#pragma section (".CRT$XLY", long, read)

void __stdcall TLSCallBack(void *, unsigned long, void *) {
    if (IsDebuggerPresent()) {
  MessageBox(NULL, "A debugger has been found running in your system.\n"
   "Please, unload it from memory and restart your program.", "ACOrigins.exe", MB_ICONERROR);
  TerminateProcess(GetCurrentProcess(), 0);
    }
}
__declspec(allocate(".CRT$XLY"))PIMAGE_TLS_CALLBACK pTLSCallBack = TLSCallBack;

int __stdcall WinMain(HINSTANCE, HINSTANCE, char *, int) {
    MessageBox(nullptr, "Success!", "ACOrigins.exe", MB_OK);
    return 0;
}