More optional system preinstalled dependencies

Catch2, ghc-filesystem, lv2 headers and VST3SDK sources preinstalled system packages can be used,
optionally and where available, to build sfizz via CMake options:

SFIZZ_USE_SYSTEM_CATCH
SFIZZ_USE_SYSTEM_GHC_FS
SFIZZ_USE_SYSTEM_LV2
SFIZZ_USE_SYSTEM_VST3SDK

CMakeLists.txt

@@ -37,10 +37,14 @@ option_ex (SFIZZ_SHARED            "Enable shared library build" ON)
 option_ex (SFIZZ_USE_SNDFILE       "Enable use of the sndfile library" OFF)
 option_ex (SFIZZ_USE_VCPKG         "Assume that sfizz is build using vcpkg" OFF)
 option_ex (SFIZZ_USE_SYSTEM_ABSEIL "Use Abseil libraries preinstalled on system" OFF)
+option_ex (SFIZZ_USE_SYSTEM_GHC_FS "Use GHC Filesystem libraries preinstalled on system" OFF)
 option_ex (SFIZZ_USE_SYSTEM_SIMDE  "Use SIMDe libraries preinstalled on system" OFF)
 option_ex (SFIZZ_USE_SYSTEM_KISS_FFT "Use KISS FFT libraries preinstalled on system" OFF)
 option_ex (SFIZZ_USE_SYSTEM_PUGIXML "Use pugixml libraries preinstalled on system" OFF)
 option_ex (SFIZZ_USE_SYSTEM_CXXOPTS "Use CXXOPTS libraries preinstalled on system" OFF)
+option_ex (SFIZZ_USE_SYSTEM_LV2     "Use LV2 headers preinstalled on system" OFF)
+option_ex (SFIZZ_USE_SYSTEM_VST3SDK "Use VST3SDK source files preinstalled on system" OFF)
+option_ex (SFIZZ_USE_SYSTEM_CATCH   "Use Catch libraries preinstalled on system" OFF)
 option_ex (SFIZZ_STATIC_DEPENDENCIES "Link dependencies statically" OFF)
 option_ex (SFIZZ_RELEASE_ASSERTS   "Forced assertions in release builds" OFF)
 option_ex (SFIZZ_PROFILE_BUILD     "Profile the build time" OFF)

cmake/SfizzConfig.cmake

@@ -4,6 +4,8 @@ include(CheckCXXCompilerFlag)
 include(CheckCXXSourceCompiles)
 include(GNUWarnings)
 
+# FIXME: The current Abseil LTS version requires at least C++14, see
+#        https://github.com/abseil/abseil-cpp/releases/tag/20230125.1
 set(CMAKE_CXX_STANDARD 11 CACHE STRING "C++ standard to be used")
 set(CMAKE_C_STANDARD 99 CACHE STRING "C standard to be used")
 

cmake/SfizzDeps.cmake

@@ -53,6 +53,10 @@ endif()
 # Add Abseil
 if(SFIZZ_USE_SYSTEM_ABSEIL)
     find_package(absl REQUIRED)
+    # Workaround for silent Abseil module, see #1117
+    if(absl_FOUND)
+        message(STATUS "Found system Abseil libraries, version ${absl_VERSION}")
+    endif()
 else()
     function(sfizz_add_vendor_abseil)
         set(BUILD_SHARED_LIBS OFF) # only changed at local scope
@@ -71,6 +75,8 @@ if(SFIZZ_USE_SYSTEM_CXXOPTS)
     find_path(CXXOPTS_INCLUDE_DIR "cxxopts.hpp")
     if(NOT CXXOPTS_INCLUDE_DIR)
         message(FATAL_ERROR "Cannot find cxxopts")
+    else()
+        message(STATUS "Found system cxxopts")
     endif()
     add_library(sfizz_cxxopts INTERFACE)
     target_include_directories(sfizz_cxxopts INTERFACE "${CXXOPTS_INCLUDE_DIR}")
@@ -241,9 +247,20 @@ if(FALSE)
     target_include_directories(sfizz_filesystem INTERFACE "external/filesystem/include")
 else()
     # static library
+    if(SFIZZ_USE_SYSTEM_GHC_FS)
+        find_path(GHC_INCLUDE_DIR "ghc/fs_std.hpp")
+        if(NOT GHC_INCLUDE_DIR)
+            message(FATAL_ERROR "Cannot find ghc-filesystem")
+        else()
+            message(STATUS "Found system ghc-filesystem")
+        endif()
+        set(SFIZZ_FILESYSTEM_INCLUDE_DIR "${GHC_INCLUDE_DIR}")
+    else()
+        set(SFIZZ_FILESYSTEM_INCLUDE_DIR "external/filesystem/include")
+    endif()
     file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/fs_std_impl.cpp" "#include <ghc/fs_std_impl.hpp>")
     add_library(sfizz_filesystem_impl STATIC "${CMAKE_CURRENT_BINARY_DIR}/fs_std_impl.cpp")
-    target_include_directories(sfizz_filesystem_impl PUBLIC "external/filesystem/include")
+    target_include_directories(sfizz_filesystem_impl PUBLIC ${SFIZZ_FILESYSTEM_INCLUDE_DIR})
     # Add the needed linker option for GCC 8
     if (CMAKE_CXX_COMPILER_ID MATCHES "GNU"
         AND CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 8.0

plugins/editor/CMakeLists.txt

@@ -1,4 +1,11 @@
-set(VSTGUI_BASEDIR "${CMAKE_CURRENT_SOURCE_DIR}/external/vstgui4")
+if(SFIZZ_USE_SYSTEM_VST3SDK)
+    find_package(PkgConfig REQUIRED)
+    pkg_check_modules(VST3SDK "vst3sdk" REQUIRED)
+    set(VSTGUI_BASEDIR "${VST3SDK_INCLUDE_DIRS}/vstgui4")
+else()
+    set(VSTGUI_BASEDIR "${CMAKE_CURRENT_SOURCE_DIR}/external/vstgui4")
+endif()
+
 include("cmake/Vstgui.cmake")
 
 set(EDITOR_RESOURCES

plugins/editor/src/editor/DlgAbout.h

@@ -11,9 +11,21 @@
 #include "utility/vstgui_after.h"
 #include <string>
 
+#define VSTGUI_MORE_THAN_4_10 ((VSTGUI_VERSION_MAJOR > 4) \
+    || (VSTGUI_VERSION_MAJOR == 4 && VSTGUI_VERSION_MINOR > 10))
+
+#if VSTGUI_MORE_THAN_4_10
+    #define OVERRIDE override
+    // FIXME: Use KeyboardEvent instead
+    #define IKEYBOARDHOOK OldKeyboardHookAdapter
+#else
+    #define OVERRIDE
+    #define IKEYBOARDHOOK IKeyboardHook
+#endif
+
 using namespace VSTGUI;
 
-class SAboutDialog : public CViewContainer, public IControlListener, public IKeyboardHook{
+class SAboutDialog : public CViewContainer, public IControlListener, public IKEYBOARDHOOK {
 
     enum {
         kTagButtonSfztools,
@@ -28,8 +40,8 @@ public:
 
     void setPluginFormat(const std::string& pluginFormat);
     void setPluginHost(const std::string& pluginHost);
-    int32_t onKeyDown (const VstKeyCode& code, CFrame* frame) override;
-    int32_t onKeyUp (const VstKeyCode& code, CFrame* frame) override;
+    int32_t onKeyDown(const VstKeyCode& code, CFrame* frame) OVERRIDE;
+    int32_t onKeyUp(const VstKeyCode& code, CFrame* frame) OVERRIDE;
 
 protected:
     CMouseEventResult onMouseDown(CPoint& where, const CButtonState& buttons) override;

plugins/lv2/CMakeLists.txt

@@ -50,13 +50,28 @@ if(${CMAKE_SYSTEM_NAME} MATCHES "Linux")
         # target_link_libraries(${LV2PLUGIN_PRJ_NAME}_ui "-Wl,-u,lv2ui_descriptor")
     endif()
 endif()
+
 target_include_directories(${LV2PLUGIN_PRJ_NAME} PRIVATE . external/ardour)
+if(SFIZZ_USE_SYSTEM_LV2)
+    find_path(LV2_INCLUDE_DIR "lv2.h")
+    if(NOT LV2_INCLUDE_DIR)
+        message(FATAL_ERROR "Cannot find lv2 include directory")
+    else()
+        message(STATUS "Found system lv2")
+    endif()
+else()
+    target_include_directories(${LV2PLUGIN_PRJ_NAME} PRIVATE vendor)
+endif()
 sfizz_enable_lto_if_needed(${LV2PLUGIN_PRJ_NAME})
 if(MINGW)
     set_target_properties(${LV2PLUGIN_PRJ_NAME} PROPERTIES LINK_FLAGS "-static")
 endif()
+
 if(SFIZZ_LV2_UI)
     target_include_directories(${LV2PLUGIN_PRJ_NAME}_ui PRIVATE . external/ardour)
+    if(NOT SFIZZ_USE_SYSTEM_LV2)
+        target_include_directories(${LV2PLUGIN_PRJ_NAME}_ui PRIVATE vendor)
+    endif()
     sfizz_enable_lto_if_needed(${LV2PLUGIN_PRJ_NAME}_ui)
     if(MINGW)
         set_target_properties(${LV2PLUGIN_PRJ_NAME}_ui PROPERTIES LINK_FLAGS "-static")

plugins/lv2/external/ardour/ardour/lv2_extensions.h

@@ -17,7 +17,7 @@
 #ifndef _ardour_lv2_extensions_h_
 #define _ardour_lv2_extensions_h_
 
-#include "lv2/core/lv2.h"
+#include <lv2/core/lv2.h>
 
 /**
    @defgroup lv2inlinedisplay Inline-Display