Questasim

Basic usage:
vlib work //creates work directory
vlog *.sv //compile
vsim -do -pli -sva //run

Questa sim identifies the system verilog files if
1) any file within design contains .sv or .svh or .svp file extension
2) you use -sv argument to vlog command (all files are sv files irrespective of file extension)
3)File extension settings in modelsim.ini (located in install directory)
";SVFileExtensions = sv svp svh"