Fixed some more Linux compiler warnings

modules/juce_audio_processors/format_types/juce_AU_Shared.h

@@ -304,11 +304,11 @@ struct AudioUnitHelpers
         }
     }
 
-    template <int numLayouts>
+    template <size_t numLayouts>
     static bool isLayoutSupported (const AudioProcessor& processor,
                                    bool isInput, int busIdx,
                                    int numChannels,
-                                   const short (&channelLayoutList) [(size_t) numLayouts][2],
+                                   const short (&channelLayoutList) [numLayouts][2],
                                    bool hasLayoutMap = true)
     {
         if (const AudioProcessor::Bus* bus = processor.getBus (isInput, busIdx))

modules/juce_audio_processors/processors/juce_AudioPluginInstance.h

@@ -115,8 +115,8 @@ protected:
 
     AudioPluginInstance() = default;
     AudioPluginInstance (const BusesProperties& ioLayouts) : AudioProcessor (ioLayouts) {}
-    template <int numLayouts>
-    AudioPluginInstance (const short channelLayoutList[(size_t) numLayouts][2]) : AudioProcessor (channelLayoutList) {}
+    template <size_t numLayouts>
+    AudioPluginInstance (const short channelLayoutList[numLayouts][2]) : AudioProcessor (channelLayoutList) {}
 
 private:
     void assertOnceOnDeprecatedMethodUse() const noexcept;

modules/juce_audio_processors/processors/juce_AudioProcessor.h

@@ -763,8 +763,8 @@ public:
         return containsLayout (layouts, layoutListToArray (channelLayoutList));
     }
 
-    template <int numLayouts>
-    static bool containsLayout (const BusesLayout& layouts, const short (&channelLayoutList) [(size_t) numLayouts][2])
+    template <size_t numLayouts>
+    static bool containsLayout (const BusesLayout& layouts, const short (&channelLayoutList) [numLayouts][2])
     {
         return containsLayout (layouts, layoutListToArray (channelLayoutList));
     }
@@ -780,9 +780,9 @@ public:
         }
         @endcode
     */
-    template <int numLayouts>
+    template <size_t numLayouts>
     BusesLayout getNextBestLayoutInLayoutList (const BusesLayout& layouts,
-                                               const short (&channelLayoutList) [(size_t) numLayouts][2])
+                                               const short (&channelLayoutList) [numLayouts][2])
     {
         return getNextBestLayoutInList (layouts, layoutListToArray (channelLayoutList));
     }
@@ -1421,8 +1421,8 @@ private:
         int16 inChannels = 0, outChannels = 0;
     };
 
-    template <int numLayouts>
-    static Array<InOutChannelPair> layoutListToArray (const short (&configuration) [(size_t) numLayouts][2])
+    template <size_t numLayouts>
+    static Array<InOutChannelPair> layoutListToArray (const short (&configuration) [numLayouts][2])
     {
         Array<InOutChannelPair> layouts;
 

modules/juce_core/threads/juce_Thread.cpp

@@ -315,7 +315,7 @@ struct LambdaThread  : public Thread
     void run() override
     {
         fn();
-        fn = {}; // free any objects that the lambda might contain while the thread is still active
+        fn = nullptr; // free any objects that the lambda might contain while the thread is still active
     }
 
     std::function<void()> fn;

modules/juce_gui_basics/juce_gui_basics.cpp

@@ -309,7 +309,18 @@ namespace juce
 #elif JUCE_LINUX
  #include "native/juce_linux_X11.cpp"
  #include "native/juce_linux_X11_Clipboard.cpp"
+
+ #if JUCE_GCC
+  #pragma GCC diagnostic push
+  #pragma GCC diagnostic ignored "-Wzero-as-null-pointer-constant"
+ #endif
+
  #include "native/juce_linux_X11_Windowing.cpp"
+
+ #if JUCE_GCC
+  #pragma GCC diagnostic pop
+ #endif
+
  #include "native/juce_linux_FileChooser.cpp"
 
 #elif JUCE_ANDROID

modules/juce_gui_extra/juce_gui_extra.cpp

@@ -101,14 +101,17 @@
   #include <fcntl.h>
   #include <sys/wait.h>
 
-  #if JUCE_GCC && __GNUC__ > 7
+  #if JUCE_GCC
    #pragma GCC diagnostic push
-   #pragma GCC diagnostic ignored "-Wparentheses"
+   #pragma GCC diagnostic ignored "-Wzero-as-null-pointer-constant"
+   #if __GNUC__ > 7
+    #pragma GCC diagnostic ignored "-Wparentheses"
+   #endif
   #endif
 
   #include <gtk/gtk.h>
 
-  #if JUCE_GCC && __GNUC__ > 7
+  #if JUCE_GCC
    #pragma GCC diagnostic pop
   #endif
 
@@ -172,10 +175,21 @@
 
 //==============================================================================
 #elif JUCE_LINUX
-  #include "native/juce_linux_XEmbedComponent.cpp"
+ #if JUCE_GCC
+  #pragma GCC diagnostic push
+  #pragma GCC diagnostic ignored "-Wzero-as-null-pointer-constant"
+ #endif
+
+ #include "native/juce_linux_XEmbedComponent.cpp"
+
  #if JUCE_WEB_BROWSER
   #include "native/juce_linux_X11_WebBrowserComponent.cpp"
  #endif
+
+ #if JUCE_GCC
+  #pragma GCC diagnostic pop
+ #endif
+
  #include "native/juce_linux_X11_SystemTrayIcon.cpp"
 
 //==============================================================================

modules/juce_gui_extra/native/juce_linux_X11_WebBrowserComponent.cpp

@@ -612,7 +612,7 @@ private:
             int result = 0;
 
             while (result == 0 || (result < 0 && errno == EINTR))
-                result = select (max_fd + 1, &set, NULL, NULL, NULL);
+                result = select (max_fd + 1, &set, nullptr, nullptr, nullptr);
 
             if (result < 0)
                 break;