The location of rc.exe (resource compiler) seems a bit confused.

Look like on Windows X64 it comes from ALT_MSDEVTOOLS_PATH, not ALT_COMPILER_PATH.
Dito on REBASE.EXE.

The documentation needs to be checked and we may consider looking at this closer.

I noticed that sometimes there are two rc.exe's in a MS compiler install area too.

With hotspot, whereever rc.exe is, that path needs to be in the PATH too, so if it isn't
in the same place as cl.exe, that's 2 paths that must be in the PATH for hotspot builds on windows.
Also verify that rebase and rc exist and when run that they run successfully.
See 7003244.