Export a compatibility entry point for VST2

plugins/vst/CMakeLists.txt

@@ -306,6 +306,7 @@ if(SFIZZ_VST2)
     add_library(${VST2PLUGIN_PRJ_NAME} MODULE
         "VstPluginFactory.cpp"
         "Vst2PluginFactory.cpp"
+        "Vst2PluginEntry.c"
         "${VST2WRAPPER_BASEDIR}/vst2wrapper.cpp"
         "${VST2WRAPPER_BASEDIR}/../basewrapper/basewrapper.cpp"
         "${VST2SDK_BASEDIR}/public.sdk/source/vst2.x/audioeffect.cpp"

plugins/vst/Vst2PluginEntry.c

@@ -0,0 +1,41 @@
+// SPDX-License-Identifier: BSD-2-Clause
+
+// This code is part of the sfizz library and is licensed under a BSD 2-clause
+// license. You should have receive a LICENSE.md file along with the code.
+// If not, contact the sfizz maintainers at https://github.com/sfztools/sfizz
+
+/*
+  Note: this file provides the traditional VST2 entry point `main` on Windows.
+        some hosts only detect this entry point.
+
+  It's required to compile this file in C mode.
+  Under MinGW, having a signature for `main` which is different from the
+  standard one is a warning in C, and an error in C++.
+*/
+
+#include "pluginterfaces/base/fplatform.h"
+#include <stdint.h>
+
+typedef struct AEffect AEffect;
+typedef int32_t VstInt32;
+typedef intptr_t VstIntPtr;
+typedef intptr_t (__cdecl *audioMasterCallback) (AEffect* effect, int32_t opcode, int32_t index, intptr_t value, void* ptr, float opt);
+
+#if defined(_WIN32)
+SMTG_EXPORT_SYMBOL AEffect* MAIN (audioMasterCallback audioMaster);
+
+#if defined(__GNUC__)
+#   pragma GCC diagnostic push
+#   pragma GCC diagnostic ignored "-Wmain"
+#endif
+
+SMTG_EXPORT_SYMBOL AEffect* main (audioMasterCallback audioMaster)
+{
+    return MAIN(audioMaster);
+}
+
+#if defined(__GNUC__)
+#   pragma GCC diagnostic pop
+#endif
+
+#endif