报错：undefined reference to `WinMain'
错音是编译器找不到main()函数：
- 可能缺少是
main()函数，比如main拼写错误 - 可能是
main()函数不再全局命名空间中，注意main()函数必须置于默认命名空间（即全局命名空间）下
- undefined reference WinMain 39 toundefined reference winmain 39 undefined_reference_to_xxx undefined_reference_to_xxx undefined reference undefined reference mkcramfs cramfs preloader undefined reference ubuntu undefined reference int add undefined reference cmake xxx imp_wsacleanup wsacleanup undefined reference event_handler undefined reference typeinfo undefined reference collect2 returned