Cannot specify a command file for Icarus from compile_args - Needed for setting timescale about cocotb-test HOT 4 CLOSED

class icarus_custom(Icarus):
    def compile_command(self):
        if '-f' in self.compile_args:
            print('A command file is already provided.')
        else:
            print('Override default icarus timescale to 1ns/1ns. Create cmds.f file and add to compile_args')
            with open(self.sim_dir+"/cmds.f", 'w') as f:
                f.write("+timescale+1ns/1ns")  
            self.compile_args.extend(["-f", self.sim_dir+"/cmds.f"])

        cmd_compile = (
            ["iverilog", "-o", self.sim_file, "-D", "COCOTB_SIM=1", "-s", self.toplevel, "-g2012"]
            + self.get_define_commands(self.defines)
            + self.get_include_commands(self.includes)
            + self.compile_args
            + self.verilog_sources
        )

        return cmd_compile

from cocotb_test.simulator import run, Icarus
from cocotb_test import simulator

class IcarusAutoTimescale(Icarus):
    def compile_command(self):
        with open(self.sim_dir+"/cmds.f", 'w') as f:
            f.write("+timescale+1ns/1ns\n")
        self.compile_args.extend(["-f", self.sim_dir+"/cmds.f"])
        return super().compile_command()

simulator.Icarus = IcarusAutoTimescale

def test_fen_decode():
    run(
        verilog_sources=["hw/fen_decode.sv", "hw/ascii_int_to_bin.sv", "hw/onehot_to_bin.v"],
        toplevel="fen_decode",
        module="cocotb_fen_decode"
    )