Questasim/Modelsim VHDL warnings
When using Questasim/Modelsim there is a easy trick to get rid of the initial warnings like
** Warning: NUMERIC_STD.TO_INTEGER: metavalue detected, returning 0. Time:0 fs
** Warning: There is an ‘U’|’X’|’W’|’Z’|’-‘ in an arithmetic operand, the result will be ‘X'(es). Time:0 fs
** Warning: CONV_INTEGER: There is an ‘U’|’X’|’W’|’Z’|’-‘ in an arithmetic operand. Time:0 fs
make a file called shutup.do
set StdArithNoWarnings 1 set StdNumNoWarnings 1 set NumericStdNoWarnings 1 run 0 ns; set StdArithNoWarnings 0 set StdNumNoWarnings 0 set NumericStdNoWarnings 0 # Continue script
Call the file with do shutup.do
andreaslindh 
I’ve used this trick in the past to hide warnings at time 0, but enable them after that:
# Supress vsim warnings about indices being X or outside of range at time 0. suppress 8233 when -fast {$now == 1ns} { suppress -clear 8233 }