Description
Due to a problem in the Quartus® II software version 11.1, the Simulation Library Compiler GUI may not see Mentor Graphics® Questasim® installations as valid when specified in the Executable Location field.
Resolution
To work around this problem in the Quartus® II software version 11.1, the command line version of the Simulation Library Compiler can be used as follows:
quartus_sh(.exe) --simlib_comp -family all -tool questasim -language <vhdl/Verilog> -tool_path <path>
For example:
quartus_sh.exe --simlib_comp -family all -tool questasim -language vhdl -tool_path C:\questasim64_10.0c\win64
This problem is fixed beginning with the Quartus II software version 12.0.