Changed Discovery Behavior of Alternative MinGW in Eclipse-CDT(8.2) Bundled in Kepler-version(4.3)

Changed Discovery Behavior of Alternative MinGW in Eclipse-CDT(8.2)
Bundled in Kepler-version(4.3)

When using an alternative MinGW version like e.g.,
mingwbuilds-gcc/g++-4.8.1, the CDT(8.2) bundled in the latest
Kepler-version(4.3) is not able to discover it as a MinGW tool chain. This
behavior is introduced with this latest release.
The MinGW discovery process works fine on such an alternative MinGW in
previous releases like Juno-SR2 bundled with CDT(8.1.1) and so on.
Indeed, there's a workaround to this problem by simply adding a file entry
named mingw32-gcc.exe in MinGW bin directory (e.g., by issuing touch
c:\MinGW\bin\mingw32-gcc.exe)

I've tried to find some documentation of the CDT tool chain discovery
process, especially for this latest CDT 8.2-version, without any success.
So, my question is: Where to find such documentation - if any?
Or, can anybody explain?

Many thanks in advance!