Compiling Xilinx libraries in Windows command prompt failed:

[ugrossm]

Compiling Xilinx libraries in Windows command prompt failed:
o:\work>nvc --install ise
** Fatal: bash C:\ProgrammeUG\nvc\libexec\nvc\install-ise.sh failed with status -1
Same result with Windows PowerShell.
When adding some echo "Test" at the beginning of file C:\ProgrammeUG\nvc\libexec\nvc\install-ise.sh there is no additional output produced in the prompt.
The environment variable %XILINX% is set to c:\Xilinx\14.7\ISE_DS\ISE.
How to deal with those bash-Scripts in a standalone nvc installation on Windows (without MSYS2 installation)?

Originally posted by @ugrossm in #876 (comment)