Hello Ozkam
First of all let me thank you for your reply.

I just have 3 questions on what you have replied to me:
1- I've done the g++ -v but it mentions a couple of times in mingw32. According to http://sourceforge.net/apps/trac/mingw-w64/wiki/download%20filename%20structure ming32 is "generate 32bit binaries that will run on windows natively". Or this is not related?
2- If I want to deliver this executable to other persons (with Windows7) I have to also include this dll in the package right?
3- in my mingw-w64 folder I have two folders with binaries:  /bin  and a folder x86_64-w64-mingw32
If I want to  generate 64bit binaries  which one shall I sue?