diff --git a/src/AudioIO.cpp b/src/AudioIO.cpp
index 60bfbf6ab..e6a3a1343 100644
--- a/src/AudioIO.cpp
+++ b/src/AudioIO.cpp
@@ -1872,7 +1872,7 @@ int AudioIO::StartStream(const WaveTrackConstArray &playbackTracks,
    mLostSamples = 0;
    mLostCaptureIntervals.clear();
    mDetectDropouts =
-      gPrefs->Read( WarningDialogKey(wxT("DropoutDetected")), (long)true );
+      gPrefs->Read( WarningDialogKey(wxT("DropoutDetected")), true ) != 0;
    auto cleanup = finally ( [this] { ClearRecordingException(); } );
 
    if( IsBusy() )
diff --git a/src/BatchProcessDialog.cpp b/src/BatchProcessDialog.cpp
index e4b69b22b..c2be887d1 100644
--- a/src/BatchProcessDialog.cpp
+++ b/src/BatchProcessDialog.cpp
@@ -903,33 +903,10 @@ void EditChainsDialog::OnRename(wxCommandEvent & WXUNUSED(event))
 
 /// An item in the list has been selected.
 /// Bring up a dialog to allow its parameters to be edited.
-void EditChainsDialog::OnCommandActivated(wxListEvent &event)
+void EditChainsDialog::OnCommandActivated(wxListEvent & WXUNUSED(event))
 {
    wxCommandEvent dummy;
    OnEditCommandParams( dummy );
-
-#if 0
-   int item = event.GetIndex();
-
-   BatchCommandDialog d(this, wxID_ANY);
-   d.SetCommandAndParams(mBatchCommands.GetCommand(item),
-                         mBatchCommands.GetParams(item));
-
-   if (!d.ShowModal()) {
-      return;
-   }
-
-   mBatchCommands.DeleteFromChain(item);
-   mBatchCommands.AddToChain(d.mSelectedCommand,
-                             d.mSelectedParameters,
-                             item);
-
-   mChanged = true;
-
-   mSelectedCommand = item;
-
-   PopulateList();
-#endif
 }
 
 ///
diff --git a/src/Project.cpp b/src/Project.cpp
index a9263e2ed..54626e5c9 100644
--- a/src/Project.cpp
+++ b/src/Project.cpp
@@ -4490,14 +4490,12 @@ void AudacityProject::InitialState()
 
 bool AudacityProject::UndoAvailable()
 {
-   auto trackList = GetTracks();
    return GetUndoManager()->UndoAvailable() &&
       !GetTracks()->HasPendingTracks();
 }
 
 bool AudacityProject::RedoAvailable()
 {
-   auto trackList = GetTracks();
    return GetUndoManager()->RedoAvailable() &&
       !GetTracks()->HasPendingTracks();
 }
diff --git a/src/export/ExportMP3.cpp b/src/export/ExportMP3.cpp
index 9f123b98e..436eb389f 100644
--- a/src/export/ExportMP3.cpp
+++ b/src/export/ExportMP3.cpp
@@ -1810,7 +1810,7 @@ ProgressResult ExportMP3::Export(AudacityProject *project,
    bool endOfFile;
    id3len = AddTags(project, id3buffer, &endOfFile, metadata);
    if (id3len && !endOfFile) {
-      if (id3len > outFile.Write(id3buffer.get(), id3len)) {
+      if (id3len > (int)outFile.Write(id3buffer.get(), id3len)) {
          // TODO: more precise message
          AudacityMessageBox(_("Unable to export"));
          return ProgressResult::Cancelled;
@@ -1897,7 +1897,7 @@ ProgressResult ExportMP3::Export(AudacityProject *project,
             break;
          }
 
-         if (bytes > outFile.Write(buffer.get(), bytes)) {
+         if (bytes > (int)outFile.Write(buffer.get(), bytes)) {
             // TODO: more precise message
             AudacityMessageBox(_("Unable to export"));
             updateResult = ProgressResult::Cancelled;
@@ -1919,7 +1919,7 @@ ProgressResult ExportMP3::Export(AudacityProject *project,
       }
 
       if (bytes > 0) {
-         if (bytes > outFile.Write(buffer.get(), bytes)) {
+         if (bytes > (int)outFile.Write(buffer.get(), bytes)) {
             // TODO: more precise message
             AudacityMessageBox(_("Unable to export"));
             return ProgressResult::Cancelled;
@@ -1928,7 +1928,7 @@ ProgressResult ExportMP3::Export(AudacityProject *project,
 
       // Write ID3 tag if it was supposed to be at the end of the file
       if (id3len > 0 && endOfFile) {
-         if (bytes > outFile.Write(id3buffer.get(), id3len)) {
+         if (bytes > (int)outFile.Write(id3buffer.get(), id3len)) {
             // TODO: more precise message
             AudacityMessageBox(_("Unable to export"));
             return ProgressResult::Cancelled;