File: t_preproc_ifdef.v

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// DESCRIPTION: Verilator: Verilog Test module
//
// This file ONLY is placed under the Creative Commons Public Domain, for
// any use, without warranty, 2007 by Wilson Snyder.
// SPDX-License-Identifier: CC0-1.0

module t (/*AUTOARG*/);
   integer num;
   initial begin
      num = 0;

`define EMPTY_TRUE
`ifndef EMPTY_TRUE
  `error "Empty is still true"
`endif

`define A
`ifdef A        $display("1A"); num = num + 1;
 `ifdef C       $stop;
 `elsif A       $display("2A"); num = num + 1;
  `ifdef C      $stop;
  `elsif B      $stop;
  `else         $display("3A"); num = num + 1;
  `endif
 `else          $stop;
 `endif
 `elsif B       $stop;
  `ifdef A      $stop;
  `elsif A      $stop;
  `else
  `endif
`elsif C        $stop;
`else           $stop;
`endif
      if (num == 3) begin
         $write("*-* All Finished *-*\n");
         $finish;
      end
      else begin
         $write("%%Error: Bad count: %d\n", num);
         $stop;
      end
   end
endmodule