Tests: Add -G test.

test_regress/t/t_flag_parameter_hier.pl

@@ -0,0 +1,33 @@
+#!/usr/bin/perl
+if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); die; }
+# DESCRIPTION: Verilator: Verilog Test driver/expect definition
+#
+# Copyright 2008 by Wilson Snyder. This program is free software; you
+# can redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+scenarios(simulator => 1);
+
+compile(
+    # For Verilator, all PARAMs at all levels are overwridden
+    # Error if parameter not found
+    #verilator_flags2 => ['-GPARAM=10 -Gtop.t.x.HIER=20'],  # HIER would error
+    verilator_flags2 => ['-GPARAM=10'],
+    # For NC, always implies a hierarchy, only HIER will be set
+    # Warns if sets nothing
+    nc_flags2 => ['+defparam+PARAM=10 +defparam+top.t.x.HIER=20'],
+    # For VCS, all PARAMs at all levels are overridden. Hierarchy not allowed.
+    # Informational on all overrides
+    vcs_flags2 => ['-pvalue+PARAM=10 -px.HIER=20'],
+    # For icarus -P without hierarchy does nothing, only can ref into top
+    iv_flags2 => ['-PPARAM=10', '-Ptop.HIER=30', '-Ptop.t.x.HIER=20'],
+    );
+
+execute(
+    check_finished => 1,
+    );
+
+ok(1);
+1;

test_regress/t/t_flag_parameter_hier.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, 2016 by Wilson Snyder.
+// SPDX-License-Identifier: CC0-1.0
+
+`define check(gotv,expv) do if ((gotv) !== (expv)) begin $write("%%Error: %s:%0d: %m: Wrong parameter value\n", `__FILE__,`__LINE__); $stop; end while(0);
+
+module t (/*AUTOARG*/
+   // Inputs
+   clk
+   );
+   input clk;
+
+   u u ();
+   tx x ();
+
+   parameter PARAM = 0;
+   parameter HIER = 0;
+   initial begin
+      $display("%m PARAM=%0d HIER=%0d", PARAM, HIER);
+`ifdef IVERILOG
+      `check(PARAM, 0);
+`elsif NC
+      `check(PARAM, 0);
+`elsif VCS
+      `check(PARAM, 10);
+`else
+      `check(PARAM, 10);
+`endif
+
+      `check(HIER, 0);
+   end
+   always @ (posedge clk) begin
+      $write("*-* All Finished *-*\n");
+      $finish;
+   end
+
+endmodule
+
+module u;
+   ux x();
+endmodule
+
+module ux;
+   parameter PARAM = 0;
+   parameter HIER = 0;
+   initial begin
+      $display("%m PARAM=%0d HIER=%0d", PARAM, HIER);
+`ifdef IVERILOG
+      `check(PARAM, 0);
+`elsif NC
+      `check(PARAM, 0);
+`elsif VCS
+      `check(PARAM, 10);
+`else
+      `check(PARAM, 0);
+`endif
+      `check(HIER, 0);
+   end
+endmodule
+
+module tx;
+   parameter PARAM = 0;
+   parameter HIER = 0;
+   initial begin
+      $display("%m PARAM=%0d HIER=%0d", PARAM, HIER);
+`ifdef IVERILOG
+      `check(PARAM, 0);
+`elsif NC
+      `check(PARAM, 10);
+`elsif VCS
+      `check(PARAM, 10);
+`else
+      `check(PARAM, 0);
+`endif
+`ifdef NC
+      `check(HIER, 20);
+`else
+      `check(HIER, 0);
+`endif
+   end
+endmodule