Compile Qtcreator with mingw ?

[wysota]

Can be so :

qmake
mingw32-make release install

This is immediately incorrect. Unless of course you set INSTALL_ROOT prior to running qmake.

And,
1.- If I set INSTALL_ROOT, how it can affect to QT operation?

I have no idea what you mean.

2.- Anyway to indicate this place to mingw32 install command ?
(mingw32-make release install:"c:\qtcreator")

Read my previous post again.

Would not it be better than the two will use the same compiler?

If they feel more comfortable with msvc then why shouldn't they be using it? What's the difference which compiler they use?