Support LV2 with MSVC (#5730)

.appveyor.yml

@@ -8,7 +8,11 @@ environment:
   matrix:
     - compiler: msvc
 install:
-  - vcpkg install --triplet %PLATFORM%-windows --recurse fftw3 libsamplerate libsndfile sdl2
+  - cd C:\Tools\vcpkg
+  - git pull
+  - .\bootstrap-vcpkg.bat
+  - cd %APPVEYOR_BUILD_FOLDER%
+  - vcpkg install --triplet %PLATFORM%-windows --recurse fftw3 libsamplerate libsndfile lilv lv2 sdl2
   - nuget install clcache -Version 4.1.0
 build_script:
   - cd %APPVEYOR_BUILD_FOLDER%

CMakeLists.txt

@@ -203,14 +203,19 @@ IF(WANT_LV2)
 	IF(PKG_CONFIG_FOUND)
 		PKG_CHECK_MODULES(LV2 lv2)
 		PKG_CHECK_MODULES(LILV lilv-0)
-		IF(LV2_FOUND AND LILV_FOUND)
-			SET(LMMS_HAVE_LV2 TRUE)
-			SET(STATUS_LV2 "OK")
-		ELSE()
-			SET(STATUS_LV2 "not found, install it or set PKG_CONFIG_PATH appropriately")
+	ENDIF()
+	IF(NOT LV2_FOUND AND NOT LILV_FOUND)
+		FIND_PACKAGE(LV2 CONFIG)
+		FIND_PACKAGE(LILV CONFIG)
+		IF(LILV_FOUND)
+			SET(LILV_LIBRARIES "lilv::lilv")
 		ENDIF()
+	ENDIF()
+	IF(LV2_FOUND AND LILV_FOUND)
+		SET(LMMS_HAVE_LV2 TRUE)
+		SET(STATUS_LV2 "OK")
 	ELSE()
-		SET(STATUS_LV2 "not found, requires pkg-config")
+		SET(STATUS_LV2 "not found, install it or set PKG_CONFIG_PATH appropriately")
 	ENDIF()
 ELSE(WANT_LV2)
 	SET(STATUS_LV2 "not built as requested")

include/Lv2ControlBase.h

@@ -33,6 +33,7 @@
 
 #include "DataFile.h"
 #include "LinkedModelGroups.h"
+#include "lmms_export.h"
 #include "Plugin.h"
 
 class Lv2Proc;
@@ -65,7 +66,7 @@ class PluginIssue;
 	* this class can not override virtuals of Instrument or EffectControls, so
 	  it will offer functions that must be called by virtuals in its child class
 */
-class Lv2ControlBase : public LinkedModelGroups
+class LMMS_EXPORT Lv2ControlBase : public LinkedModelGroups
 {
 public:
 	static Plugin::PluginTypes check(const LilvPlugin* m_plugin,
@@ -87,7 +88,11 @@ protected:
 	//!   this is the same pointer as this, but a different type
 	//! @param uri the Lv2 URI telling this class what plugin to construct
 	Lv2ControlBase(class Model *that, const QString& uri);
+	Lv2ControlBase(const Lv2ControlBase&) = delete;
 	~Lv2ControlBase() override;
+
+	Lv2ControlBase& operator=(const Lv2ControlBase&) = delete;
+
 	//! Must be checked after ctor or reload
 	bool isValid() const { return m_valid; }
 

include/Lv2SubPluginFeatures.h

@@ -33,9 +33,10 @@
 
 #include <lilv/lilv.h>
 
+#include "lmms_export.h"
 #include "Plugin.h"
 
-class Lv2SubPluginFeatures : public Plugin::Descriptor::SubPluginFeatures
+class LMMS_EXPORT Lv2SubPluginFeatures : public Plugin::Descriptor::SubPluginFeatures
 {
 private:
 	static const LilvPlugin *getPlugin(const Key &k);

include/Lv2ViewBase.h

@@ -34,6 +34,7 @@
 #include <QVector>
 
 #include "LinkedModelGroupViews.h"
+#include "lmms_export.h"
 #include "Lv2Basics.h"
 
 class Lv2Proc;
@@ -54,7 +55,7 @@ private:
 
 
 //! Base class for view for one Lv2 plugin
-class Lv2ViewBase : public LinkedModelGroupsView
+class LMMS_EXPORT Lv2ViewBase : public LinkedModelGroupsView
 {
 protected:
 	//! @param pluginWidget A child class which inherits QWidget

plugins/Lv2Effect/Lv2Effect.cpp

@@ -35,6 +35,9 @@
 
 
 
+extern "C"
+{
+
 Plugin::Descriptor PLUGIN_EXPORT lv2effect_plugin_descriptor =
 {
 	STRINGIFY(PLUGIN_NAME),
@@ -49,6 +52,8 @@ Plugin::Descriptor PLUGIN_EXPORT lv2effect_plugin_descriptor =
 	new Lv2SubPluginFeatures(Plugin::Effect)
 };
 
+}
+
 
 
 

plugins/Lv2Instrument/Lv2Instrument.cpp

@@ -41,6 +41,9 @@
 
 
 
+extern "C"
+{
+
 Plugin::Descriptor PLUGIN_EXPORT lv2instrument_plugin_descriptor =
 {
 	STRINGIFY(PLUGIN_NAME),
@@ -55,6 +58,8 @@ Plugin::Descriptor PLUGIN_EXPORT lv2instrument_plugin_descriptor =
 	new Lv2SubPluginFeatures(Plugin::Instrument)
 };
 
+}
+
 
 
 
@@ -221,7 +226,7 @@ Lv2InsView::Lv2InsView(Lv2Instrument *_instrument, QWidget *_parent) :
 	setAutoFillBackground(true);
 	if (m_reloadPluginButton) {
 		connect(m_reloadPluginButton, &QPushButton::clicked,
-			this, [this](){ castModel<Lv2Instrument>()->reloadPlugin();} );
+			this, [this](){ this->castModel<Lv2Instrument>()->reloadPlugin();} );
 	}
 	if (m_toggleUIButton) {
 		connect(m_toggleUIButton, &QPushButton::toggled,