From 63ac579c1b03320c53ff592a1cf71de1b29ea0c7 Mon Sep 17 00:00:00 2001
From: attila <attila@juce.com>
Date: Thu, 14 Oct 2021 16:19:44 +0200
Subject: [PATCH] VST3 Client:  Fix build when JUCE_VST3_CAN_REPLACE_VST2 is
 enabled

---
 .../VST3/juce_VST3_Wrapper.cpp                    |  1 +
 .../utilities/juce_ExtensionsVisitor.h            | 15 +++++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/modules/juce_audio_plugin_client/VST3/juce_VST3_Wrapper.cpp b/modules/juce_audio_plugin_client/VST3/juce_VST3_Wrapper.cpp
index af923bb286..2263c6aaca 100644
--- a/modules/juce_audio_plugin_client/VST3/juce_VST3_Wrapper.cpp
+++ b/modules/juce_audio_plugin_client/VST3/juce_VST3_Wrapper.cpp
@@ -65,6 +65,7 @@ JUCE_BEGIN_NO_SANITIZE ("vptr")
 
  namespace Vst2
  {
+ struct AEffect;
  #include "pluginterfaces/vst2.x/vstfxstore.h"
  }
 
diff --git a/modules/juce_audio_processors/utilities/juce_ExtensionsVisitor.h b/modules/juce_audio_processors/utilities/juce_ExtensionsVisitor.h
index 64e3179be5..bfed95b273 100644
--- a/modules/juce_audio_processors/utilities/juce_ExtensionsVisitor.h
+++ b/modules/juce_audio_processors/utilities/juce_ExtensionsVisitor.h
@@ -44,6 +44,21 @@ typedef struct ComponentInstanceRecord* AudioComponentInstance;
 typedef AudioComponentInstance AudioUnit;
 
 //==============================================================================
+/*  If you are including the VST headers inside a namespace this forward
+    declaration may cause a collision with the contents of `aeffect.h`.
+
+    If that is the case you can avoid the collision by placing a `struct AEffect;`
+    forward declaration inside the namespace and before the inclusion of the VST
+    headers, e.g. @code
+
+    namespace Vst2
+    {
+    struct AEffect;
+    #include <pluginterfaces/vst2.x/aeffect.h>
+    #include <pluginterfaces/vst2.x/aeffectx.h>
+    }
+    @endcode
+*/
 struct AEffect;
 
 //==============================================================================