I have just downloaded MinGW gcc-4.4.0 from SourceForge and the last Upp available (upp-x11-src-1422.tar.gz), and I have compiled TheIde with MinGW-Speed.
I have not found any warning.
I enclose the compiler output.
Best regards
Koldo
PD. I have chosen TheIde as it is a big program. In fact TheIde compiled with MinGW is not usable.