Silence a few warnings in juce code

source/modules/juce_audio_formats/codecs/juce_FlacAudioFormat.cpp

@@ -117,6 +117,9 @@ namespace FlacNamespace
   #pragma clang diagnostic ignored "-Wconversion"
   #pragma clang diagnostic ignored "-Wshadow"
   #pragma clang diagnostic ignored "-Wdeprecated-register"
+ #elif JUCE_GCC && (__GNUC__ >= 6)
+  #pragma GCC diagnostic push
+  #pragma GCC diagnostic ignored "-Wimplicit-fallthrough"
  #endif
 
  #if JUCE_INTEL
@@ -157,6 +160,8 @@ namespace FlacNamespace
 
  #if JUCE_CLANG
   #pragma clang diagnostic pop
+ #elif JUCE_GCC && (__GNUC__ >= 6)
+  #pragma GCC diagnostic pop
  #endif
 }
 

source/modules/juce_audio_formats/codecs/juce_OggVorbisAudioFormat.cpp

@@ -47,6 +47,9 @@ namespace OggVorbisNamespace
  #elif JUCE_GCC
   #pragma GCC diagnostic push
   #pragma GCC diagnostic ignored "-Wshadow"
+  #if (__GNUC__ >= 6)
+   #pragma GCC diagnostic ignored "-Wimplicit-fallthrough"
+  #endif
  #endif
 
  #include "oggvorbis/vorbisenc.h"

source/modules/juce_core/native/juce_posix_SharedCode.h

@@ -1205,6 +1205,8 @@ public:
                 close (pipeHandles[1]); // close the write handle
             }
         }
+
+        ignoreUnused (streamFlags);
     }
 
     ~ActiveProcess()

source/modules/juce_core/zip/juce_GZIPDecompressorInputStream.cpp

@@ -39,6 +39,9 @@ namespace zlibNamespace
    #if __has_warning("-Wcomma")
     #pragma clang diagnostic ignored "-Wcomma"
    #endif
+  #elif JUCE_GCC && (__GNUC__ >= 6)
+   #pragma GCC diagnostic push
+   #pragma GCC diagnostic ignored "-Wimplicit-fallthrough"
   #endif
 
   #undef OS_CODE
@@ -74,6 +77,8 @@ namespace zlibNamespace
 
   #if JUCE_CLANG
    #pragma clang diagnostic pop
+  #elif JUCE_GCC && (__GNUC__ >= 6)
+   #pragma GCC diagnostic pop
   #endif
  #else
   #include JUCE_ZLIB_INCLUDE_PATH