let's try console

CMakeLists.txt

@@ -400,6 +400,7 @@ src/engine/platform/sound/c64/wave8580_PST.cc
 src/engine/platform/sound/c64/wave8580_P_T.cc
 src/engine/platform/sound/c64/wave8580__ST.cc
 
+src/engine/platform/sound/c64_fp/array.cpp
 src/engine/platform/sound/c64_fp/Dac.cpp
 src/engine/platform/sound/c64_fp/EnvelopeGenerator.cpp
 src/engine/platform/sound/c64_fp/ExternalFilter.cpp
@@ -763,9 +764,7 @@ if (WARNINGS_ARE_ERRORS)
   )
 endif()
 
-if (WIN32)
+if(ANDROID AND NOT TERMUX)
-  add_executable(furnace WIN32 ${USED_SOURCES})
-elseif(ANDROID AND NOT TERMUX)
   add_library(furnace SHARED ${USED_SOURCES})
 else()
   add_executable(furnace ${USED_SOURCES})

src/engine/platform/sound/c64_fp/array.cpp

@@ -0,0 +1,26 @@
+/*
+ * This file is part of a modification to libsidplayfp, a SID player engine.
+ * The applied modification fixes compilation under recent version of GCC,
+ * which have tougher warnings against memory access problems.
+ *
+ *  Copyright (C) 2011-2014 Leandro Nini
+ *  Copyright (C) 2023 tildearrow
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include "array.h"
+
+std::mutex counterOps;

src/engine/platform/sound/c64_fp/array.h

@@ -21,6 +21,10 @@
 #ifndef ARRAY_H
 #define ARRAY_H
 
+#include <mutex>
+
+extern std::mutex counterOps;
+
 /**
  * Counter.
  */
@@ -59,7 +63,7 @@ public:
         x(p.x),
         y(p.y) { count->increase(); }
 
-    ~matrix() { if (count->decrease() == 0) { delete count; delete [] data; } }
+    ~matrix() { counterOps.lock(); if (count->decrease() == 0) { delete count; delete [] data; } counterOps.unlock(); }
 
     unsigned int length() const { return x * y; }