Fix debug crash when no std:: used

src/V3Global.cpp

@@ -77,14 +77,6 @@ void V3Global::readFiles() {
                          "Cannot find file containing library module: ");
     }
 
-    // Delete the std package if unused
-    if (!usesStdPackage()) {
-        if (AstNodeModule* stdp = v3Global.rootp()->stdPackagep()) {
-            v3Global.rootp()->stdPackagep(nullptr);
-            VL_DO_DANGLING(stdp->unlinkFrBack()->deleteTree(), stdp);
-        }
-    }
-
     // v3Global.rootp()->dumpTreeFile(v3Global.debugFilename("parse.tree"));
     V3Error::abortIfErrors();
 
@@ -94,6 +86,16 @@ void V3Global::readFiles() {
     }
 }
 
+void V3Global::removeStd() {
+    // Delete the std package if unused
+    if (!usesStdPackage()) {
+        if (AstNodeModule* stdp = v3Global.rootp()->stdPackagep()) {
+            v3Global.rootp()->stdPackagep(nullptr);
+            VL_DO_DANGLING(stdp->unlinkFrBack()->deleteTree(), stdp);
+        }
+    }
+}
+
 string V3Global::debugFilename(const string& nameComment, int newNumber) {
     ++m_debugFileNumber;
     if (newNumber) m_debugFileNumber = newNumber;

src/V3Global.h

@@ -135,6 +135,7 @@ public:
 
     // METHODS
     void readFiles();
+    void removeStd();
     void checkTree() const;
     static void dumpCheckGlobalTree(const string& stagename, int newNumber = 0,
                                     bool doDump = true);

src/Verilator.cpp

@@ -618,6 +618,7 @@ static void verilate(const string& argString) {
 
     // Read first filename
     v3Global.readFiles();
+    v3Global.removeStd();
 
     // Link, etc, if needed
     if (!v3Global.opt.preprocOnly()) {  //