From 6c8d95e0e23f7cd7702a245568ab6c8e3b197383 Mon Sep 17 00:00:00 2001
From: Wilson Snyder <wsnyder@wsnyder.org>
Date: Fri, 22 Feb 2013 17:14:27 -0500
Subject: [PATCH] Nice message on fopen with missing argument.

---
 src/V3Gate.cpp | 2 +-
 src/verilog.y  | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/V3Gate.cpp b/src/V3Gate.cpp
index 7710d1608..4f6ebf02c 100644
--- a/src/V3Gate.cpp
+++ b/src/V3Gate.cpp
@@ -103,7 +103,7 @@ public:
     virtual AstNUser* accept(GateGraphBaseVisitor& v, AstNUser* vup=NULL) =0;
     // Returns only the result from the LAST vertex iterated over
     AstNUser* iterateInEdges(GateGraphBaseVisitor& v, AstNUser* vup=NULL) {
-	AstNUser* retp;
+	AstNUser* retp = NULL;
 	for (V3GraphEdge* edgep = inBeginp(); edgep; edgep = edgep->inNextp()) {
 	    retp = dynamic_cast<GateEitherVertex*>(edgep->fromp())->accept(v, vup);
 	}
diff --git a/src/verilog.y b/src/verilog.y
index fa0a208e6..6baf41349 100644
--- a/src/verilog.y
+++ b/src/verilog.y
@@ -2184,6 +2184,7 @@ statementVerilatorPragmas<nodep>:
 
 foperator_assignment<nodep>:	// IEEE: operator_assignment (for first part of expression)
 		fexprLvalue '=' delayE expr	{ $$ = new AstAssign($2,$1,$4); }
+	|	fexprLvalue '=' yD_FOPEN '(' expr ')'		{ $$ = NULL; $3->v3error("Unsupported: $fopen with multichannel descriptor.  Add ,\"w\" as second argument to open a file descriptor."); }
 	|	fexprLvalue '=' yD_FOPEN '(' expr ',' expr ')'	{ $$ = new AstFOpen($3,$1,$5,$7); }
 	//
 	//UNSUP	~f~exprLvalue '=' delay_or_event_controlE expr { UNSUP }