fpga: tools: Add modelsim.ini to ModelSim calls

This adds the MSIM_VIV_COMPLIBDIR environment variable to specify
a non-default location for the compilation libraries.

This also allows a modelsim.ini other than the one in the ModelSim
installation folder to be used. By default, the one in the simulation
libraries compilation directory will be used. This can be changed by
setting MSIM_MODELSIM_INI to the one you want to use, or set it to an
empty string to use the one in the ModelSim installation folder.


Original-commit: 08473776b28a949027ec8cf2596d8d1b438b979b

tools/scripts/setupenv_base.sh

@@ -243,15 +243,30 @@ if [[ $VSIM_PATH ]]; then
     case $MODELSIM_VER in
         DE-64|SE-64)
             export MODELSIM_64BIT=1
-            export SIM_COMPLIBDIR=$VIVADO_PATH/modelsim64
+            if [[ -z $MSIM_VIV_COMPLIBDIR ]]; then
+                export SIM_COMPLIBDIR=$VIVADO_PATH/modelsim64
+            else
+                export SIM_COMPLIBDIR=$MSIM_VIV_COMPLIBDIR
+            fi
         ;;
         DE|SE|PE)
             export MODELSIM_64BIT=0
-            export SIM_COMPLIBDIR=$VIVADO_PATH/modelsim32
+            if [[ -z $MSIM_VIV_COMPLIBDIR ]]; then
+                export SIM_COMPLIBDIR=$VIVADO_PATH/modelsim32
+            else
+                export SIM_COMPLIBDIR=$MSIM_VIV_COMPLIBDIR
+            fi
         ;;
         *)
         ;;
     esac
+    # If MSIM_MODELSIM_INI is not defined, use the modelsim.ini in the compiled
+    # libraries directory. Otherwise use the one defined by MSIM_MODELSIM_INI.
+    # Set MSIM_MODELSIM_INI to an empty string to use the modelsim.ini in the
+    # ModelSim installation folder.
+    if [[ ! -v MSIM_MODELSIM_INI ]]; then
+        export MODELSIM_INI=$SIM_COMPLIBDIR/modelsim.ini
+    fi
 fi
 
 function build_simlibs {