How to suppress 'warning: Timing checks are not supported.' warnings?

[zapta]

When we run the command below, we get tens fo 'Timing checks are not supported.' warnings. Is there a flag or a similar way to suppress them, without modifying the source file or running post processing filters?

iverilog -g2012 -o _build/blinky_tb.out -DVCD_OUTPUT=_build/blinky_tb -I"/Users/user/.apio/packages/oss-cad-suite/share/yosys/gowin" "/Users/user/.apio/packages/oss-cad-suite/share/yosys/gowin/cells_sim.v" blinky.v blinky_tb.v

/Users/user/.apio/packages/oss-cad-suite/share/yosys/gowin/cells_sim.v:176: warning: Timing checks are not supported.
/Users/user/.apio/packages/oss-cad-suite/share/yosys/gowin/cells_sim.v:190: warning: Timing checks are not supported.
/Users/user/.apio/packages/oss-cad-suite/share/yosys/gowin/cells_sim.v:191: warning: Timing checks are not supported.
/Users/user/.apio/packages/oss-cad-suite/share/yosys/gowin/cells_sim.v:207: warning: Timing checks are not supported.
/Users/user/.apio/packages/oss-cad-suite/share/yosys/gowin/cells_sim.v:208: warning: Timing checks are not supported.
/Users/user/.apio/packages/oss-cad-suite/share/yosys/gowin/cells_sim.v:226: warning: Timing checks are not supported.
/Users/user/.apio/packages/oss-cad-suite/share/yosys/gowin/cells_sim.v:227: warning: Timing checks are not supported.
/Users/user/.apio/packages/oss-cad-suite/share/yosys/gowin/cells_sim.v:228: warning: Timing checks are not supported.
/Users/user/.apio/packages/oss-cad-suite/share/yosys/gowin/cells_sim.v:246: warning: Timing checks are not supported.
/Users/user/.apio/packages/oss-cad-suite/share/yosys/gowin/cells_sim.v:247: warning: Timing checks are not supported.
...

The first warning is about the $setup() function below

(* abc9_flop, lib_whitebox *)
module DFF (output reg Q, input CLK, D);
        parameter [0:0] INIT = 1'b0;
        initial Q = INIT;

        specify
                (posedge CLK => (Q : D)) = (480, 660);
                $setup(D, posedge CLK, 576);
        endspecify
                
        always @(posedge CLK)
                Q <= D;
endmodule

[martinwhitaker]

There isn't, but IMO these should be suppressed when -gno-specify (the default) is used.