Do not compile AudioGeneratorMIDI if GCC is 8 (compiler bug) (#502)

Author: Martin-Laclaustra

src/AudioGeneratorMIDI.cpp

@@ -58,6 +58,10 @@
 
 #include "AudioGeneratorMIDI.h"
 
+#if __GNUC__ == 8
+// Do not build, GCC8 has a compiler bug
+#else // __GNUC__ == 8
+
 #pragma GCC optimize ("O3")
 
 #define TSF_NO_STDIO
@@ -637,3 +641,5 @@ void AudioGeneratorMIDI::MakeStreamFromAFS(AudioFileSource *src, tsf_stream *afs
   afs->size = &afs_size;
 }
 
+#endif //__GNUC__ == 8
+

src/AudioGeneratorMIDI.h

@@ -21,6 +21,10 @@
 #ifndef _AUDIOGENERATORMIDI_H
 #define _AUDIOGENERATORMIDI_H
 
+#if __GNUC__ == 8
+// Do not build, GCC8 has a compiler bug
+#else // __GNUC__ == 8
+
 #include "AudioGenerator.h"
 
 #define TSF_NO_STDIO
@@ -176,6 +180,7 @@ class AudioGeneratorMIDI : public AudioGenerator
     short samplesRendered[256];
 };
 
+#endif //__GNUC__ == 8
 
 #endif