如何使用交叉编译器i686-w64-mingw32-gcc指定win32或Windows 64目标

I have recently downloaded the mingw-w64 package under Fedora Linux in order to be able to cross compile targetting both win32 and "Windows 64". But I fail to understand how to specify what target I want to use. What flags do I need to supply to gcc and to the linker in order to choose my target architecture?I have recently downloaded the mingw-w64 packag