Verilator

Please try to make a standalone test case that fails; the critical code here is what's in the ...'s. Also, in the end I suspect the package won't be needed to show the bug.

Test case:

localparam MAX_STRING_LENGTH = 20;

function real get_real_value;
   input [8*MAX_STRING_LENGTH:1] time_string;
   real                          result;
   begin
      result = 0.0;
      get_real_value = result;
   end
endfunction

module test
#(
  parameter reference_clock_frequency = "0 ps" 
) (
   input wire  refclk,
   input wire  rst,
   output wire outclk
);

   localparam reference_clock_period_value_param = get_real_value(reference_clock_frequency);
   localparam valid_param = (reference_clock_period_value_param > 0);

   generate
      if ( valid_param == 1 )
        begin
           assign outclk = refclk;
        end
      else
        begin
           assign outclk = 0;
        end
   endgenerate

endmodule // test

Verilator output:

verilator -sp -Wno-fatal --top-module test test.v
%Warning-WIDTH: test.v:21: Operator FUNCREF 'get_real_value' expects 160 bits on the Function Argument, but Function Argument's VARREF 'reference_clock_frequency' generates 32 bits.
%Warning-WIDTH: Use "/* verilator lint_off WIDTH */" and lint_on around source to disable this message.
%Error: Internal Error: test.v:21: ../V3Number.cpp:518: Real conversion on non real number
%Error: Command Failed /tools/verilator/verilator-3.832/bin/verilator_bin -sp -Wno-fatal --top-module test test.v