From a4f3199427ffb42922ba30bf902b86e3c6ab5802 Mon Sep 17 00:00:00 2001
From: Wilson Snyder <wsnyder@wsnyder.org>
Date: Wed, 2 Jul 2008 06:48:50 -0400
Subject: [PATCH] Add informational warning when -Og is used

---
 src/V3Error.cpp   | 5 ++++-
 src/V3Error.h     | 4 +++-
 src/Verilator.cpp | 2 ++
 3 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/V3Error.cpp b/src/V3Error.cpp
index 8fe7ed9ad..8e6bd914c 100644
--- a/src/V3Error.cpp
+++ b/src/V3Error.cpp
@@ -261,6 +261,7 @@ void V3Error::abortIfWarnings() {
 
 bool V3Error::isError(V3ErrorCode code) {
     if (code==V3ErrorCode::SUPPRESS) return false;
+    else if (code==V3ErrorCode::INFO) return false;
     else if (code==V3ErrorCode::FATAL) return true;
     else if (code==V3ErrorCode::ERROR) return true;
     else if (code<V3ErrorCode::FIRST_WARN
@@ -270,6 +271,7 @@ bool V3Error::isError(V3ErrorCode code) {
 
 string V3Error::msgPrefix(V3ErrorCode code) {
     if (code==V3ErrorCode::SUPPRESS) return "-arning-suppressed: ";
+    else if (code==V3ErrorCode::INFO) return "-Info: ";
     else if (code==V3ErrorCode::FATAL) return "%Error: ";
     else if (code==V3ErrorCode::ERROR) return "%Error: ";
     else if (isError(code)) return "%Error-"+(string)code.ascii()+": ";
@@ -311,7 +313,8 @@ void V3Error::v3errorEnd (ostringstream& sstr) {
 	if (sstr.str()[sstr.str().length()-1] != '\n') {
 	    cerr<<endl;
 	}
-	if (s_errorCode!=V3ErrorCode::SUPPRESS) {
+	if (s_errorCode!=V3ErrorCode::SUPPRESS
+	    && s_errorCode!=V3ErrorCode::INFO) {
 	    if (!s_describedEachWarn[s_errorCode]
 		&& !s_pretendError[s_errorCode]) {
 		s_describedEachWarn[s_errorCode] = true;
diff --git a/src/V3Error.h b/src/V3Error.h
index a2b87b203..2b7d74b0b 100644
--- a/src/V3Error.h
+++ b/src/V3Error.h
@@ -34,6 +34,7 @@ class V3ErrorCode {
 public:
     enum en {
 	SUPPRESS,	// Warning suppressed by user
+	INFO,		// General information out
 	FATAL,		// Kill the program
 	ERROR,		// General error out, can't suppress
 	// Error codes:
@@ -74,7 +75,7 @@ public:
     const char* ascii() const {
 	const char* names[] = {
 	    // Leading spaces indicate it can't be disabled.
-	    " SUPPRESS", " FATAL", " ERROR",
+	    " SUPPRESS", " INFO", " FATAL", " ERROR",
 	     "MULTITOP", "TASKNSVAR",
 	    " FIRST_WARN",
 	    "BLKANDNBLK",
@@ -159,6 +160,7 @@ inline void v3errorEnd(ostringstream& sstr) { V3Error::v3errorEnd(sstr); }
 
 // These allow errors using << operators: v3error("foo"<<"bar");
 // Careful, you can't put () around msg, as you would in most macro definitions
+#define v3info(msg)  v3errorEnd(((V3Error::v3errorPrep(V3ErrorCode::INFO)<<msg),V3Error::v3errorStr()));
 #define v3fatal(msg) v3errorEnd(((V3Error::v3errorPrep(V3ErrorCode::FATAL)<<msg),V3Error::v3errorStr()));
 #define v3error(msg) v3errorEnd(((V3Error::v3errorPrep(V3ErrorCode::ERROR)<<msg),V3Error::v3errorStr()));
 #define v3warn(code,msg) v3errorEnd(((V3Error::v3errorPrep(V3ErrorCode::code)<<msg),V3Error::v3errorStr()));
diff --git a/src/Verilator.cpp b/src/Verilator.cpp
index e3854eeff..3b467b8c8 100644
--- a/src/Verilator.cpp
+++ b/src/Verilator.cpp
@@ -307,6 +307,8 @@ void process () {
 	V3Gate::gateAll(v3Global.rootp());
 	v3Global.rootp()->dumpTreeFile(v3Global.debugFilename("gate.tree"));
 	// V3Gate calls constant propagation itself.
+    } else {
+	v3info("Command Line disabled gate optimization with -Og/-O0.  This may cause ordering problems.");
     }
 
     // Remove unused vars