Fix building with mingw but not for linux+wine usage

data/windows/build-win32.sh

@@ -23,8 +23,8 @@ export CC=$MINGW-gcc
 export CXX=$MINGW-g++
 export WINDRES=$MINGW-windres
 
-export CFLAGS="-DPTW32_STATIC_LIB"
-export CXXFLAGS="-DPTW32_STATIC_LIB -DFLUIDSYNTH_NOT_A_DLL"
+export CFLAGS="-DBUILDING_CARLA_FOR_WINDOWS -DPTW32_STATIC_LIB"
+export CXXFLAGS="$CFLAGS -DFLUIDSYNTH_NOT_A_DLL"
 unset CPPFLAGS
 unset LDFLAGS
 

data/windows/build-win64.sh

@@ -24,8 +24,8 @@ export CC=$MINGW-gcc
 export CXX=$MINGW-g++
 export WINDRES=$MINGW-windres
 
-export CFLAGS="-DPTW32_STATIC_LIB"
-export CXXFLAGS="-DPTW32_STATIC_LIB -DFLUIDSYNTH_NOT_A_DLL"
+export CFLAGS="-DBUILDING_CARLA_FOR_WINDOWS -DPTW32_STATIC_LIB"
+export CXXFLAGS="$CFLAGS -DFLUIDSYNTH_NOT_A_DLL"
 unset CPPFLAGS
 unset LDFLAGS
 

source/utils/CarlaBridgeUtils.hpp

@@ -20,7 +20,7 @@
 
 #include "CarlaRingBuffer.hpp"
 
-#ifdef CARLA_OS_WIN
+#if defined(CARLA_OS_WIN) && defined(BUILDING_CARLA_FOR_WINDOWS)
 # define PLUGIN_BRIDGE_NAMEPREFIX_AUDIO_POOL    "Global\\carla-bridge_shm_ap_"
 # define PLUGIN_BRIDGE_NAMEPREFIX_RT_CLIENT     "Global\\carla-bridge_shm_rtC_"
 # define PLUGIN_BRIDGE_NAMEPREFIX_NON_RT_CLIENT "Global\\carla-bridge_shm_nonrtC_"

source/utils/CarlaShmUtils.hpp

@@ -88,8 +88,7 @@ shm_t carla_shm_create(const char* const filename) noexcept
             ::shm_unlink(filename);
             ret.fd = -1;
         }
-    }
-    CARLA_SAFE_EXCEPTION_RETURN("carla_shm_create", gNullCarlaShm);
+    } CARLA_SAFE_EXCEPTION_RETURN("carla_shm_create", gNullCarlaShm);
 #endif
 
     return ret;
@@ -114,8 +113,7 @@ shm_t carla_shm_attach(const char* const filename) noexcept
         ret.fd       = ::shm_open(filename, O_RDWR, 0);
         ret.filename = nullptr;
         ret.size     = 0;
-    }
-    CARLA_SAFE_EXCEPTION_RETURN("carla_shm_attach", gNullCarlaShm);
+    } CARLA_SAFE_EXCEPTION_RETURN("carla_shm_attach", gNullCarlaShm);
 #endif
 
     return ret;