gEDA: iverilog + gtkwave + lxt problem

[Nikolay V. Pyatkov]

I got a problem using iverilog  to produce .lxt files or using  gtkwave to 
view them. I am not sure what is happening.

I was using iverilog s20030924, and gtkwave v1.3.24. But yestarday after 
discovering the problem upgraded to the latest iverilog 0.8. Did not help.

Below is a simple module and a script to build lxt and vvp dumps. vvp dump 
looks normal, lxt is wrong.

Is there another lxt viewer to at least identify which program is broken?


Thanks,
Nikolay


//
//

`timescale 1 ns / 1 ns

module test;

    reg clk, odd, mux_sel;
    reg [15:0] data;
    
    initial {clk, mux_sel, data, odd} = 0;

    initial begin
`ifdef USE_LXT
        $dumpfile ("test.lxt");
`else
        $dumpfile ("test.vcd");
`endif
        $dumpvars (0, test);

        #150; $finish;
    end
        
    always clk = #5 ~clk;
    
    always @(posedge clk) begin
        if (odd) begin
            mux_sel = 1'b1;
            data = data + 1;
        end else begin
            mux_sel = 1'b0;
        end
        
        odd = ~odd;
    end

    reg [7:0] mux_o;
    
    always @(mux_sel or data) begin
        case (mux_sel)
          1'b0: mux_o = data [15:8];
          1'b1: mux_o = data [7:0];
        endcase // case(mus_sel)
        $display ("mux_o = %2x at time %t", mux_o, $time);
    end
endmodule // test


#/!sh
#
# script to build test.vvp and test.lxt
#
iverilog -DUSE_LXT -Wimplicit ./test.v -o test.vvp
vvp test.vvp -lxt

iverilog -Wimplicit ./test.v -o test.vvp
vvp test.vvp