Analysis of the problem described here, using mingw-get's dependency tracing mode
$ mingw-get --trace=0x0200 install "mingw32-gcc=4.7.2-1" 2>&1 | tee trace-5.log
reveals that dependency resolution is failing for
libgcc-4.7.2-1.dll-1 because the constraints specified when resolving the requirement for the
gcc-core package appear to be subsequently ignored, when recursive evaluation of its further dependency on
binutils causes re-evaluation of the
libgcc dependency, with a less constrained specification.
This results in installation of the wrong version of the
libgcc package, with consequent payload conflicts due to package reorganization, and probable malfunction of the installed application suite.