新版本的gcc已經不支持 -mno-cygwin了。在cygwin中編譯（1）中的代碼，會出現如下的信息：
gcc: The -mno-cygwin flag has been removed; use a mingw-targeted cross-compiler.
提示說要可以用MinGW來代替，gcc好人性化，贊！
google了下，國內的大部分都是說加上-mno-cygwin就可以不依賴cygwin1.dll庫了，但是並沒有說新版本的gcc不支持-mno-cygwin編譯選項了。
去MinGW網站http://www.mingw.org/，下載在線安裝包mingw-get-inst-20110530.exe，這樣安裝的好處是不需要自己去設置環境變量，直接下一步下一步，選擇安裝gcc，g++，msys base system等包，安裝完成就可以在windows下使用gcc和g++編譯器了。
轉載自mingw官網
MinGW provides a complete Open Source programming tool set which is suitable for the development of native MS-Windows applications, and which do not depend on any 3rd-party C-Runtime DLLs. (Itdoes depend on a number
of DLLs provided by Microsoft themselves, as components of the operating system; most notable among these is MSVCRT.DLL, the Microsoft C runtime library. Additionally, threaded applicationsmust ship with a freely distributable thread
support DLL, provided as part of MinGW itself).
