More unused parameters and local variables.

src/AudioIO.cpp

@@ -515,7 +515,7 @@ struct AudioIO::ScrubQueue
          // There is work in the queue, but if Producer is outrunning us, discard some,
          // which may make a skip yet keep playback better synchronized with user gestures.
          const auto interval = (now - mLastTransformerTimeMillis).ToDouble() / 1000.0;
-         const Entry &previous = mEntries[(mMiddleIdx + Size - 1) % Size];
+         //const Entry &previous = mEntries[(mMiddleIdx + Size - 1) % Size];
          const auto deficit =
             static_cast<long>(interval * mRate) - // Samples needed in the last time interval
             mCredit;                              // Samples done in the last time interval

src/Dependencies.cpp

@@ -84,7 +84,7 @@ static void GetAllSeqBlocks(AudacityProject *project,
 static void ReplaceBlockFiles(AudacityProject *project,
                               ReplacedBlockFileHash &hash)
 {
-   const auto &dirManager = project->GetDirManager();
+   //const auto &dirManager = project->GetDirManager();
    BlockPtrArray blocks;
    GetAllSeqBlocks(project, &blocks);
 

src/Snap.cpp

@@ -289,7 +289,10 @@ bool SnapManager::SnapToPoints(Track *currentTrack,
       return true;
    }
 
-   size_t indexInThisTrack = -1;
+   // indexInThisTrack is ONLY used if count > 0
+   // and is initialised then, so we can 'initialise' it
+   // to anything to keep compiler quiet.
+   size_t indexInThisTrack = left;
    size_t countInThisTrack = 0;
    for (i = left; i <= right; ++i)
    {

src/effects/Paulstretch.cpp

@@ -399,7 +399,7 @@ bool EffectPaulstretch::ProcessOne(WaveTrack *track,double t0,double t1,int coun
 /*************************************************************/
 
 
-PaulStretch::PaulStretch(float rap_, size_t in_bufsize_, float samplerate_)
+PaulStretch::PaulStretch(float rap_, size_t in_bufsize_, float /*samplerate_*/)
    : samplerate { samplerate }
    , rap { std::max(1.0f, rap_) }
    , in_bufsize { in_bufsize_ }

src/toolbars/ToolBar.cpp

@@ -186,7 +186,7 @@ void ToolBarResizer::OnLeftUp( wxMouseEvent & event )
    }
 }
 
-void ToolBarResizer::OnEnter( wxMouseEvent & event )
+void ToolBarResizer::OnEnter( wxMouseEvent & /*event*/ )
 {
    // Bug 1201:  On Mac, unsetting and re-setting the tooltip may be needed
    // to make it pop up when we want it.
@@ -197,7 +197,7 @@ void ToolBarResizer::OnEnter( wxMouseEvent & event )
       mOrigFocus = FindFocus();
 }
 
-void ToolBarResizer::OnLeave( wxMouseEvent & event )
+void ToolBarResizer::OnLeave( wxMouseEvent & /*event*/ )
 {
    if (!GetCapture())
       mOrigFocus = nullptr;

src/widgets/Meter.cpp

@@ -868,10 +868,12 @@ static float floatMax(float a, float b)
    return a>b? a: b;
 }
 
+/* Unused as yet.
 static int intmin(int a, int b)
 {
    return a<b? a: b;
 }
+*/
 
 static int intmax(int a, int b)
 {