diff --git a/modules/juce_audio_devices/native/juce_linux_ALSA.cpp b/modules/juce_audio_devices/native/juce_linux_ALSA.cpp
index 202debe4ff..e1d1c90d83 100644
--- a/modules/juce_audio_devices/native/juce_linux_ALSA.cpp
+++ b/modules/juce_audio_devices/native/juce_linux_ALSA.cpp
@@ -930,7 +930,7 @@ public:
         return wantInputNames ? inputNames : outputNames;
     }
 
-    int getDefaultDeviceIndex (bool forInput) const
+    int getDefaultDeviceIndex (bool /* forInput */) const
     {
         jassert (hasScanned); // need to call scanForDevices() before doing this
         return 0;
diff --git a/modules/juce_audio_devices/native/juce_linux_JackAudio.cpp b/modules/juce_audio_devices/native/juce_linux_JackAudio.cpp
index 7ff20d869a..a956986c4b 100644
--- a/modules/juce_audio_devices/native/juce_linux_JackAudio.cpp
+++ b/modules/juce_audio_devices/native/juce_linux_JackAudio.cpp
@@ -101,19 +101,25 @@ namespace
 
 //==============================================================================
 #ifndef JUCE_JACK_CLIENT_NAME
- #define JUCE_JACK_CLIENT_NAME "JuceJack"
+ #define JUCE_JACK_CLIENT_NAME "JUCEJack"
 #endif
 
+static const char** getJackPorts (jack_client_t* const client, const bool forInput)
+{
+    return juce::jack_get_ports (client, nullptr, nullptr,
+                                 forInput ? JackPortIsInput : JackPortIsOutput);
+}
+
 //==============================================================================
 class JackAudioIODevice   : public AudioIODevice
 {
 public:
     JackAudioIODevice (const String& deviceName,
-                       const String& inputId_,
-                       const String& outputId_)
+                       const String& inId,
+                       const String& outId)
         : AudioIODevice (deviceName, "JACK"),
-          inputId (inputId_),
-          outputId (outputId_),
+          inputId (inId),
+          outputId (outId),
           isOpen_ (false),
           callback (nullptr),
           totalNumberOfInputChannels (0),
@@ -134,7 +140,7 @@ public:
 
             // open input ports
             const StringArray inputChannels (getInputChannelNames());
-            for (int i = 0; i < inputChannels.size(); i++)
+            for (int i = 0; i < inputChannels.size(); ++i)
             {
                 String inputName;
                 inputName << "in_" << ++totalNumberOfInputChannels;
@@ -145,7 +151,7 @@ public:
 
             // open output ports
             const StringArray outputChannels (getOutputChannelNames());
-            for (int i = 0; i < outputChannels.size (); i++)
+            for (int i = 0; i < outputChannels.size (); ++i)
             {
                 String outputName;
                 outputName << "out_" << ++totalNumberOfOutputChannels;
@@ -172,15 +178,11 @@ public:
     StringArray getChannelNames (bool forInput) const
     {
         StringArray names;
-        const char** const ports = juce::jack_get_ports (client, 0, 0, /* JackPortIsPhysical | */
-                                                         forInput ? JackPortIsInput : JackPortIsOutput);
-
-        if (ports != 0)
+        if (const char** const ports = getJackPorts (client, forInput))
         {
-            int j = 0;
-            while (ports[j] != 0)
+            for (int j = 0; ports[j] != nullptr; ++j)
             {
-                const String portName (ports [j++]);
+                const String portName (ports [j]);
 
                 if (portName.upToFirstOccurrenceOf (":", false, false) == getName())
                     names.add (portName.fromFirstOccurrenceOf (":", false, false));
@@ -195,13 +197,13 @@ public:
     StringArray getOutputChannelNames()         { return getChannelNames (false); }
     StringArray getInputChannelNames()          { return getChannelNames (true); }
     int getNumSampleRates()                     { return client != nullptr ? 1 : 0; }
-    double getSampleRate (int index)            { return client != nullptr ? juce::jack_get_sample_rate (client) : 0; }
+    double getSampleRate (int /*index*/)        { return client != nullptr ? juce::jack_get_sample_rate (client) : 0; }
     int getNumBufferSizesAvailable()            { return client != nullptr ? 1 : 0; }
-    int getBufferSizeSamples (int index)        { return getDefaultBufferSize(); }
+    int getBufferSizeSamples (int /*index*/)    { return getDefaultBufferSize(); }
     int getDefaultBufferSize()                  { return client != nullptr ? juce::jack_get_buffer_size (client) : 0; }
 
     String open (const BigInteger& inputChannels, const BigInteger& outputChannels,
-                 double sampleRate, int bufferSizeSamples)
+                 double /* sampleRate */, int /* bufferSizeSamples */)
     {
         if (client == nullptr)
         {
@@ -219,9 +221,7 @@ public:
 
         if (! inputChannels.isZero())
         {
-            const char** const ports = juce::jack_get_ports (client, 0, 0, /* JackPortIsPhysical | */ JackPortIsOutput);
-
-            if (ports != 0)
+            if (const char** const ports = getJackPorts (client, true))
             {
                 const int numInputChannels = inputChannels.getHighestBit() + 1;
 
@@ -243,9 +243,7 @@ public:
 
         if (! outputChannels.isZero())
         {
-            const char** const ports = juce::jack_get_ports (client, 0, 0, /* JackPortIsPhysical | */ JackPortIsInput);
-
-            if (ports != 0)
+            if (const char** const ports = getJackPorts (client, false))
             {
                 const int numOutputChannels = outputChannels.getHighestBit() + 1;
 
@@ -275,8 +273,8 @@ public:
         if (client != nullptr)
         {
             juce::jack_deactivate (client);
-            juce::jack_set_process_callback (client, processCallback, 0);
-            juce::jack_on_shutdown (client, shutdownCallback, 0);
+            juce::jack_set_process_callback (client, processCallback, nullptr);
+            juce::jack_on_shutdown (client, shutdownCallback, nullptr);
         }
 
         isOpen_ = false;
@@ -360,23 +358,19 @@ public:
 private:
     void process (const int numSamples)
     {
-        int i, numActiveInChans = 0, numActiveOutChans = 0;
+        int numActiveInChans = 0, numActiveOutChans = 0;
 
-        for (i = 0; i < totalNumberOfInputChannels; ++i)
+        for (int i = 0; i < totalNumberOfInputChannels; ++i)
         {
-            jack_default_audio_sample_t* in
-                = (jack_default_audio_sample_t*) juce::jack_port_get_buffer ((jack_port_t*) inputPorts.getUnchecked(i), numSamples);
-
-            if (in != nullptr)
+            if (jack_default_audio_sample_t* in
+                    = (jack_default_audio_sample_t*) juce::jack_port_get_buffer ((jack_port_t*) inputPorts.getUnchecked(i), numSamples))
                 inChans [numActiveInChans++] = (float*) in;
         }
 
-        for (i = 0; i < totalNumberOfOutputChannels; ++i)
+        for (int i = 0; i < totalNumberOfOutputChannels; ++i)
         {
-            jack_default_audio_sample_t* out
-                = (jack_default_audio_sample_t*) juce::jack_port_get_buffer ((jack_port_t*) outputPorts.getUnchecked(i), numSamples);
-
-            if (out != nullptr)
+            if (jack_default_audio_sample_t* out
+                    = (jack_default_audio_sample_t*) juce::jack_port_get_buffer ((jack_port_t*) outputPorts.getUnchecked(i), numSamples))
                 outChans [numActiveOutChans++] = (float*) out;
         }
 
@@ -389,20 +383,20 @@ private:
         }
         else
         {
-            for (i = 0; i < numActiveOutChans; ++i)
+            for (int i = 0; i < numActiveOutChans; ++i)
                 zeromem (outChans[i], sizeof (float) * numSamples);
         }
     }
 
     static int processCallback (jack_nframes_t nframes, void* callbackArgument)
     {
-        if (callbackArgument != 0)
+        if (callbackArgument != nullptr)
             ((JackAudioIODevice*) callbackArgument)->process (nframes);
 
         return 0;
     }
 
-    static void threadInitCallback (void* callbackArgument)
+    static void threadInitCallback (void* /* callbackArgument */)
     {
         jack_Log ("JackAudioIODevice::initialise");
     }
@@ -411,9 +405,7 @@ private:
     {
         jack_Log ("JackAudioIODevice::shutdown");
 
-        JackAudioIODevice* device = (JackAudioIODevice*) callbackArgument;
-
-        if (device != nullptr)
+        if (JackAudioIODevice* device = (JackAudioIODevice*) callbackArgument)
         {
             device->client = nullptr;
             device->close();
@@ -442,14 +434,12 @@ private:
 class JackAudioIODeviceType  : public AudioIODeviceType
 {
 public:
-    //==============================================================================
     JackAudioIODeviceType()
         : AudioIODeviceType ("JACK"),
           hasScanned (false)
     {
     }
 
-    //==============================================================================
     void scanForDevices()
     {
         hasScanned = true;
@@ -466,59 +456,42 @@ public:
                 return;
         }
 
-        // open a dummy client
         jack_status_t status;
-        jack_client_t* client = juce::jack_client_open ("JuceJackDummy", JackNoStartServer, &status);
 
-        if (client == nullptr)
-        {
-            dumpJackErrorMessage (status);
-        }
-        else
+        // open a dummy client
+        if (jack_client_t* const client = juce::jack_client_open ("JuceJackDummy", JackNoStartServer, &status))
         {
             // scan for output devices
-            const char** ports = juce::jack_get_ports (client, 0, 0, /* JackPortIsPhysical | */ JackPortIsOutput);
-
-            if (ports != nullptr)
+            if (const char** const ports = getJackPorts (client, false))
             {
-                int j = 0;
-                while (ports[j] != 0)
+                for (int j = 0; ports[j] != nullptr; ++j)
                 {
                     String clientName (ports[j]);
                     clientName = clientName.upToFirstOccurrenceOf (":", false, false);
 
-                    if (clientName != String (JUCE_JACK_CLIENT_NAME)
-                         && ! inputNames.contains (clientName))
+                    if (clientName != (JUCE_JACK_CLIENT_NAME) && ! inputNames.contains (clientName))
                     {
                         inputNames.add (clientName);
                         inputIds.add (ports [j]);
                     }
-
-                    ++j;
                 }
 
                 free (ports);
             }
 
             // scan for input devices
-            ports = juce::jack_get_ports (client, 0, 0, /* JackPortIsPhysical | */ JackPortIsInput);
-
-            if (ports != nullptr)
+            if (const char** const ports = getJackPorts (client, true))
             {
-                int j = 0;
-                while (ports[j] != 0)
+                for (int j = 0; ports[j] != nullptr; ++j)
                 {
                     String clientName (ports[j]);
                     clientName = clientName.upToFirstOccurrenceOf (":", false, false);
 
-                    if (clientName != String (JUCE_JACK_CLIENT_NAME)
-                         && ! outputNames.contains (clientName))
+                    if (clientName != (JUCE_JACK_CLIENT_NAME) && ! outputNames.contains (clientName))
                     {
                         outputNames.add (clientName);
                         outputIds.add (ports [j]);
                     }
-
-                    ++j;
                 }
 
                 free (ports);
@@ -526,6 +499,10 @@ public:
 
             juce::jack_client_close (client);
         }
+        else
+        {
+            dumpJackErrorMessage (status);
+        }
     }
 
     StringArray getDeviceNames (bool wantInputNames) const
@@ -534,7 +511,7 @@ public:
         return wantInputNames ? inputNames : outputNames;
     }
 
-    int getDefaultDeviceIndex (bool forInput) const
+    int getDefaultDeviceIndex (bool /* forInput */) const
     {
         jassert (hasScanned); // need to call scanForDevices() before doing this
         return 0;
@@ -546,12 +523,11 @@ public:
     {
         jassert (hasScanned); // need to call scanForDevices() before doing this
 
-        JackAudioIODevice* d = dynamic_cast <JackAudioIODevice*> (device);
-        if (d == nullptr)
-            return -1;
+        if (JackAudioIODevice* d = dynamic_cast <JackAudioIODevice*> (device))
+            return asInput ? inputIds.indexOf (d->inputId)
+                           : outputIds.indexOf (d->outputId);
 
-        return asInput ? inputIds.indexOf (d->inputId)
-                       : outputIds.indexOf (d->outputId);
+        return -1;
     }
 
     AudioIODevice* createDevice (const String& outputDeviceName,
@@ -571,7 +547,6 @@ public:
         return nullptr;
     }
 
-    //==============================================================================
 private:
     StringArray inputNames, outputNames, inputIds, outputIds;
     bool hasScanned;
diff --git a/modules/juce_audio_formats/codecs/flac/libFLAC/stream_encoder.c b/modules/juce_audio_formats/codecs/flac/libFLAC/stream_encoder.c
index e592d1ebb6..b4eb0ea6f1 100644
--- a/modules/juce_audio_formats/codecs/flac/libFLAC/stream_encoder.c
+++ b/modules/juce_audio_formats/codecs/flac/libFLAC/stream_encoder.c
@@ -2437,7 +2437,7 @@ FLAC__bool write_bitbuffer_(FLAC__StreamEncoder *encoder, unsigned samples, FLAC
 	return true;
 }
 
-FLAC__StreamEncoderWriteStatus write_frame_(FLAC__StreamEncoder *encoder, const FLAC__byte buffer[], size_t bytes, unsigned samples, FLAC__bool is_last_block)
+FLAC__StreamEncoderWriteStatus write_frame_(FLAC__StreamEncoder *encoder, const FLAC__byte buffer[], size_t bytes, unsigned samples, FLAC__bool /* is_last_block */)
 {
 	FLAC__StreamEncoderWriteStatus status;
 	FLAC__uint64 output_position = 0;
diff --git a/modules/juce_audio_formats/codecs/oggvorbis/libvorbis-1.3.2/lib/floor0.c b/modules/juce_audio_formats/codecs/oggvorbis/libvorbis-1.3.2/lib/floor0.c
index fd9cf65307..4eac09ce03 100644
--- a/modules/juce_audio_formats/codecs/oggvorbis/libvorbis-1.3.2/lib/floor0.c
+++ b/modules/juce_audio_formats/codecs/oggvorbis/libvorbis-1.3.2/lib/floor0.c
@@ -144,7 +144,7 @@ static void floor0_map_lazy_init(vorbis_block      *vb,
   }
 }
 
-static vorbis_look_floor *floor0_look(vorbis_dsp_state *vd,
+static vorbis_look_floor *floor0_look(vorbis_dsp_state* /* vd */,
                                       vorbis_info_floor *i){
   vorbis_info_floor0 *info=(vorbis_info_floor0 *)i;
   vorbis_look_floor0 *look=(vorbis_look_floor0*)_ogg_calloc(1,sizeof(*look));
diff --git a/modules/juce_audio_formats/codecs/oggvorbis/libvorbis-1.3.2/lib/floor1.c b/modules/juce_audio_formats/codecs/oggvorbis/libvorbis-1.3.2/lib/floor1.c
index eb248d2376..5a8bd92eca 100644
--- a/modules/juce_audio_formats/codecs/oggvorbis/libvorbis-1.3.2/lib/floor1.c
+++ b/modules/juce_audio_formats/codecs/oggvorbis/libvorbis-1.3.2/lib/floor1.c
@@ -175,7 +175,7 @@ static vorbis_info_floor *floor1_unpack (vorbis_info *vi,oggpack_buffer *opb){
   return(NULL);
 }
 
-static vorbis_look_floor *floor1_look(vorbis_dsp_state *vd,
+static vorbis_look_floor *floor1_look(vorbis_dsp_state* /* vd */,
                                       vorbis_info_floor *in){
 
   int *sortpointer[VIF_POSIT+2];
diff --git a/modules/juce_audio_formats/codecs/oggvorbis/libvorbis-1.3.2/lib/os.h b/modules/juce_audio_formats/codecs/oggvorbis/libvorbis-1.3.2/lib/os.h
index b9d44b09e0..621747276f 100644
--- a/modules/juce_audio_formats/codecs/oggvorbis/libvorbis-1.3.2/lib/os.h
+++ b/modules/juce_audio_formats/codecs/oggvorbis/libvorbis-1.3.2/lib/os.h
@@ -155,10 +155,10 @@ static __inline int vorbis_ftoi(double f){
         return _mm_cvtsd_si32(_mm_load_sd(&f));
 }
 
-static __inline void vorbis_fpu_setround(vorbis_fpu_control *fpu){
+static __inline void vorbis_fpu_setround(vorbis_fpu_control*){
 }
 
-static __inline void vorbis_fpu_restore(vorbis_fpu_control fpu){
+static __inline void vorbis_fpu_restore(vorbis_fpu_control){
 }
 
 #endif /* Special MSVC x64 implementation */
diff --git a/modules/juce_audio_formats/codecs/oggvorbis/libvorbis-1.3.2/lib/res0.c b/modules/juce_audio_formats/codecs/oggvorbis/libvorbis-1.3.2/lib/res0.c
index c664079773..cb375ea498 100644
--- a/modules/juce_audio_formats/codecs/oggvorbis/libvorbis-1.3.2/lib/res0.c
+++ b/modules/juce_audio_formats/codecs/oggvorbis/libvorbis-1.3.2/lib/res0.c
@@ -393,7 +393,7 @@ static int local_book_besterror(codebook *book,int *a){
 }
 
 static int _encodepart(oggpack_buffer *opb,int *vec, int n,
-                       codebook *book,long *acc){
+                       codebook *book,long* /* acc */){
   int i,bits=0;
   int dim=book->dim;
   int step=n/dim;
@@ -536,12 +536,12 @@ static long **_2class(vorbis_block *vb,vorbis_look_residue *vl,int **in,
 }
 
 static int _01forward(oggpack_buffer *opb,
-                      vorbis_block *vb,vorbis_look_residue *vl,
+                      vorbis_block*, vorbis_look_residue *vl,
                       int **in,int ch,
                       long **partword,
                       int (*encode)(oggpack_buffer *,int *,int,
                                     codebook *,long *),
-                      int submap){
+                      int /* submap */){
   long i,j,k,s;
   vorbis_look_residue0 *look=(vorbis_look_residue0 *)vl;
   vorbis_info_residue0 *info=look->info;
diff --git a/modules/juce_core/maths/juce_Range.h b/modules/juce_core/maths/juce_Range.h
index 625a6d0b34..95a675d7a7 100644
--- a/modules/juce_core/maths/juce_Range.h
+++ b/modules/juce_core/maths/juce_Range.h
@@ -143,7 +143,7 @@ public:
         return Range (jmin (start, newEnd), newEnd);
     }
 
-    /** Returns a range with the same length as this one, but moved to have the given start position. */
+    /** Returns a range with the same length as this one, but moved to have the given end position. */
     Range movedToEndAt (const ValueType newEnd) const noexcept
     {
         return Range (start + (newEnd - end), newEnd);
diff --git a/modules/juce_core/native/juce_linux_Network.cpp b/modules/juce_core/native/juce_linux_Network.cpp
index 2e9aa416d1..16dcb09492 100644
--- a/modules/juce_core/native/juce_linux_Network.cpp
+++ b/modules/juce_core/native/juce_linux_Network.cpp
@@ -52,10 +52,10 @@ void MACAddress::findAllAddresses (Array<MACAddress>& result)
 }
 
 
-bool Process::openEmailWithAttachments (const String& targetEmailAddress,
-                                        const String& emailSubject,
-                                        const String& bodyText,
-                                        const StringArray& filesToAttach)
+bool Process::openEmailWithAttachments (const String& /* targetEmailAddress */,
+                                        const String& /* emailSubject */,
+                                        const String& /* bodyText */,
+                                        const StringArray& /* filesToAttach */)
 {
     jassertfalse;    // xxx todo
 
diff --git a/modules/juce_events/native/juce_linux_Messaging.cpp b/modules/juce_events/native/juce_linux_Messaging.cpp
index b48358646c..359114be50 100644
--- a/modules/juce_events/native/juce_linux_Messaging.cpp
+++ b/modules/juce_events/native/juce_linux_Messaging.cpp
@@ -224,7 +224,7 @@ namespace LinuxErrorHandling
 
     //==============================================================================
     // Usually happens when client-server connection is broken
-    int ioErrorHandler (Display* display)
+    int ioErrorHandler (Display*)
     {
         DBG ("ERROR: connection to X server broken.. terminating.");
 
@@ -364,7 +364,7 @@ bool MessageManager::postMessageToSystemQueue (MessageManager::MessageBase* cons
     return true;
 }
 
-void MessageManager::broadcastMessage (const String& value)
+void MessageManager::broadcastMessage (const String& /* value */)
 {
     /* TODO */
 }
diff --git a/modules/juce_graphics/image_formats/pnglib/pngconf.h b/modules/juce_graphics/image_formats/pnglib/pngconf.h
index c379da888a..34115f0824 100644
--- a/modules/juce_graphics/image_formats/pnglib/pngconf.h
+++ b/modules/juce_graphics/image_formats/pnglib/pngconf.h
@@ -36,9 +36,9 @@
 #define PNG_NO_READ_sPLT 1
 
 #define png_error(a, b) png_err(a)
-#define png_warning(a, b)
+#define png_warning(a, b) (void)0
 #define png_chunk_error(a, b) png_err(a)
-#define png_chunk_warning(a, b)
+#define png_chunk_warning(a, b) png_warning(a, b)
 
 //==============================================================================
 
diff --git a/modules/juce_gui_basics/mouse/juce_MouseCursor.h b/modules/juce_gui_basics/mouse/juce_MouseCursor.h
index 58588afb0e..9caa10cfca 100644
--- a/modules/juce_gui_basics/mouse/juce_MouseCursor.h
+++ b/modules/juce_gui_basics/mouse/juce_MouseCursor.h
@@ -101,8 +101,8 @@ public:
                         cursors.
         @param hotSpotX the x position of the cursor's hotspot within the image
         @param hotSpotY the y position of the cursor's hotspot within the image
-        @param dpiFactor the factor by which this image is larger than the target
-                         screen size of the cursor.
+        @param scaleFactor the factor by which this image is larger than the target
+                           screen size of the cursor.
     */
     MouseCursor (const Image& image, int hotSpotX, int hotSpotY, float scaleFactor);
 
diff --git a/modules/juce_gui_basics/native/juce_linux_Clipboard.cpp b/modules/juce_gui_basics/native/juce_linux_Clipboard.cpp
index 190a2b0402..6988d17c38 100644
--- a/modules/juce_gui_basics/native/juce_linux_Clipboard.cpp
+++ b/modules/juce_gui_basics/native/juce_linux_Clipboard.cpp
@@ -48,12 +48,12 @@ namespace ClipboardHelpers
     //==============================================================================
     // Read the content of a window property as either a locale-dependent string or an utf8 string
     // works only for strings shorter than 1000000 bytes
-    static String readWindowProperty (Window window, Atom prop, Atom fmt)
+    static String readWindowProperty (Window window, Atom prop)
     {
         String returnData;
         char* clipData;
         Atom actualType;
-        int  actualFormat;
+        int actualFormat;
         unsigned long numItems, bytesLeft;
 
         if (XGetWindowProperty (display, window, prop,
@@ -100,8 +100,7 @@ namespace ClipboardHelpers
                     jassert (event.xselection.requestor == juce_messageWindowHandle);
 
                     selectionContent = readWindowProperty (event.xselection.requestor,
-                                                           event.xselection.property,
-                                                           requestedFormat);
+                                                           event.xselection.property);
                     return true;
                 }
                 else
diff --git a/modules/juce_gui_basics/native/juce_linux_FileChooser.cpp b/modules/juce_gui_basics/native/juce_linux_FileChooser.cpp
index 8506405045..5bd789a902 100644
--- a/modules/juce_gui_basics/native/juce_linux_FileChooser.cpp
+++ b/modules/juce_gui_basics/native/juce_linux_FileChooser.cpp
@@ -41,13 +41,13 @@ bool FileChooser::isPlatformDialogAvailable()
 void FileChooser::showPlatformDialog (Array<File>& results,
                                       const String& title,
                                       const File& file,
-                                      const String& filters,
+                                      const String& /* filters */,
                                       bool isDirectory,
-                                      bool selectsFiles,
+                                      bool /* selectsFiles */,
                                       bool isSave,
-                                      bool warnAboutOverwritingExistingFiles,
+                                      bool /* warnAboutOverwritingExistingFiles */,
                                       bool selectMultipleFiles,
-                                      FilePreviewComponent* previewComponent)
+                                      FilePreviewComponent* /* previewComponent */)
 {
     String separator;
     StringArray args;
diff --git a/modules/juce_gui_basics/native/juce_linux_Windowing.cpp b/modules/juce_gui_basics/native/juce_linux_Windowing.cpp
index bd498a99c7..2d3605b139 100644
--- a/modules/juce_gui_basics/native/juce_linux_Windowing.cpp
+++ b/modules/juce_gui_basics/native/juce_linux_Windowing.cpp
@@ -963,7 +963,7 @@ public:
         return screenPosition - getScreenPosition();
     }
 
-    void setAlpha (float newAlpha)
+    void setAlpha (float /* newAlpha */)
     {
         //xxx todo!
     }
@@ -1109,7 +1109,7 @@ public:
         return BorderSize<int>();
     }
 
-    bool setAlwaysOnTop (bool alwaysOnTop)
+    bool setAlwaysOnTop (bool /* alwaysOnTop */)
     {
         return false;
     }
@@ -1507,7 +1507,7 @@ public:
         }
 
         if (dragState.dragging)
-            handleExternalDragButtonReleaseEvent (buttonRelEvent);
+            handleExternalDragButtonReleaseEvent();
 
         handleMouseEvent (0, getMousePos (buttonRelEvent), currentModifiers, getEventTime (buttonRelEvent));
 
@@ -2551,7 +2551,7 @@ private:
         }
     }
 
-    void handleExternalDragButtonReleaseEvent (const XButtonReleasedEvent& buttonRelEvent)
+    void handleExternalDragButtonReleaseEvent()
     {
         if (dragState.dragging)
             XUngrabPointer (display, CurrentTime);
@@ -2952,7 +2952,7 @@ ModifierKeys ModifierKeys::getCurrentModifiersRealtime() noexcept
 
 
 //==============================================================================
-void Desktop::setKioskComponent (Component* kioskModeComponent, bool enableOrDisable, bool allowMenusAndBars)
+void Desktop::setKioskComponent (Component* kioskModeComponent, bool enableOrDisable, bool /* allowMenusAndBars */)
 {
     if (enableOrDisable)
         kioskModeComponent->setBounds (Desktop::getInstance().getDisplays().getMainDisplay().totalArea);
@@ -3334,7 +3334,7 @@ void MouseCursor::showInAllWindows() const
 }
 
 //==============================================================================
-Image juce_createIconForFile (const File& file)
+Image juce_createIconForFile (const File& /* file */)
 {
     return Image::null;
 }
@@ -3380,16 +3380,16 @@ void LookAndFeel::playAlertSound()
 //==============================================================================
 void JUCE_CALLTYPE NativeMessageBox::showMessageBox (AlertWindow::AlertIconType iconType,
                                                      const String& title, const String& message,
-                                                     Component* associatedComponent)
+                                                     Component* /* associatedComponent */)
 {
-    AlertWindow::showMessageBox (AlertWindow::NoIcon, title, message);
+    AlertWindow::showMessageBox (iconType, title, message);
 }
 
 void JUCE_CALLTYPE NativeMessageBox::showMessageBoxAsync (AlertWindow::AlertIconType iconType,
                                                           const String& title, const String& message,
-                                                          Component* associatedComponent)
+                                                          Component* /* associatedComponent */)
 {
-    AlertWindow::showMessageBoxAsync (AlertWindow::NoIcon, title, message);
+    AlertWindow::showMessageBoxAsync (iconType, title, message);
 }
 
 bool JUCE_CALLTYPE NativeMessageBox::showOkCancelBox (AlertWindow::AlertIconType iconType,
diff --git a/modules/juce_gui_basics/widgets/juce_TextEditor.h b/modules/juce_gui_basics/widgets/juce_TextEditor.h
index bf58d1429d..5fdff0534d 100644
--- a/modules/juce_gui_basics/widgets/juce_TextEditor.h
+++ b/modules/juce_gui_basics/widgets/juce_TextEditor.h
@@ -552,7 +552,7 @@ public:
     {
     public:
         /** Creates a filter that limits the length of text, and/or the characters that it can contain.
-            @param maxTextLength        if this is > 0, it sets a maximum length limit; if <= 0, no
+            @param maxNumChars          if this is > 0, it sets a maximum length limit; if <= 0, no
                                         limit is set
             @param allowedCharacters    if this is non-empty, then only characters that occur in
                                         this string are allowed to be entered into the editor.
diff --git a/modules/juce_gui_extra/native/juce_linux_SystemTrayIcon.cpp b/modules/juce_gui_extra/native/juce_linux_SystemTrayIcon.cpp
index 5c62925379..6db77fd2ec 100644
--- a/modules/juce_gui_extra/native/juce_linux_SystemTrayIcon.cpp
+++ b/modules/juce_gui_extra/native/juce_linux_SystemTrayIcon.cpp
@@ -118,7 +118,7 @@ void SystemTrayIconComponent::paint (Graphics& g)
                            RectanglePlacement::xLeft | RectanglePlacement::yTop | RectanglePlacement::onlyReduceInSize, false);
 }
 
-void SystemTrayIconComponent::setIconTooltip (const String& tooltip)
+void SystemTrayIconComponent::setIconTooltip (const String& /* tooltip */)
 {
     // xxx not yet implemented!
 }