Allow io-range-error warnings to be disabled (issue #788)

It was common practice in the past to just declare a port direction
and declare it as a vector in a subsequent type declaration. Versions
of the standard up to and including 1364-2005 include an example that
does this (e.g. 1364-2005 section 12.3.7). Users may have old or
third-party code that they can't or don't want to modify, so allow
the warning to be suppressed by including it in the anachronisms
category.

driver/iverilog.man.in

@@ -122,7 +122,8 @@ practice in the past to only specify the range for the net/register
 declaration and some tools still allow this. By default any mismatch is
 reported as a error. Using \fB\-gno\-io\-range\-error\fP will produce a
 warning instead of a fatal error for the case of a vectored net/register
-and a scalar port declaration.
+and a scalar port declaration. This warning is included in the
+\fBanachronisms\fP category.
 .TP 8
 .B -gstrict-ca-eval\fI|\fP-gno-strict-ca-eval
 The standard requires that if any input to a continuous assignment

elab_sig.cc

@@ -1080,17 +1080,17 @@ NetNet* PWire::elaborate_sig(Design*des, NetScope*scope) const
 	        dimensions_ok) {
 		  /* Scalar port with a vector net/etc. definition */
 		  if (port_.empty()) {
-			if (!gn_io_range_error_flag) {
-			      cerr << get_fileline()
-			           << ": warning: Scalar port ``" << name_
-			           << "'' has a vectored net declaration "
-				   << nlist << "." << endl;
-			} else {
+			if (gn_io_range_error_flag) {
 			      cerr << get_fileline()
 			           << ": error: Scalar port ``" << name_
 			           << "'' has a vectored net declaration "
 				   << nlist << "." << endl;
 			      des->errors += 1;
+			} else if (warn_anachronisms) {
+			      cerr << get_fileline()
+			           << ": warning: Scalar port ``" << name_
+			           << "'' has a vectored net declaration "
+				   << nlist << "." << endl;
 			}
 		  }
 

ivtest/gold/br_gh788.gold

@@ -0,0 +1 @@
+42

ivtest/ivltests/br_gh788.v

@@ -0,0 +1,18 @@
+module test();
+
+task print_hex;
+
+  input n;
+
+  reg [7:0] n;
+
+  begin
+    $display("%h", n);
+  end  
+endtask
+
+initial begin
+  print_hex(66);
+end
+   
+endmodule

ivtest/regress-vlg.list

@@ -349,6 +349,7 @@ br_gh632b		normal,-S		ivltests
 br_gh632c		normal			ivltests
 br_gh674		normal			ivltests
 br_gh732		normal			ivltests gold=br_gh732.gold
+br_gh788		normal,-gno-io-range-error,-Wno-anachronisms	ivltests gold=br_gh788.gold
 br_gh793		normal			ivltests
 br_ml20150315		normal			ivltests gold=br_ml_20150315.gold
 br_ml20150321		CE			ivltests