Fix win32 cmake build

Signed-off-by: falkTX <falktx@falktx.com>

cmake/DPF-plugin.cmake

@@ -722,6 +722,14 @@ function(dpf__add_dgl_cairo SHARED_RESOURCES USE_FILE_BROWSER USE_WEB_VIEW)
 
   if(USE_WEB_VIEW)
     target_compile_definitions(dgl-cairo PUBLIC "DGL_USE_FILE_BROWSER")
+    if(WIN32)
+      target_sources(dgl-cairo PRIVATE
+        "${DPF_ROOT_DIR}/dgl/src/WebViewWin32.cpp")
+      set_source_files_properties("${DPF_ROOT_DIR}/dgl/src/WebViewWin32.cpp"
+        PROPERTIES
+          COMPILE_FLAGS
+            $<IF:$<BOOL:${MSVC}>,/std:c++17,-std=gnu++17>)
+    endif()
   endif()
 
   dpf__add_dgl_system_libs()
@@ -786,6 +794,14 @@ function(dpf__add_dgl_external USE_FILE_BROWSER USE_WEB_VIEW)
 
   if(USE_WEB_VIEW)
     target_compile_definitions(dgl-external PUBLIC "DGL_USE_WEB_VIEW")
+    if(WIN32)
+      target_sources(dgl-external PRIVATE
+        "${DPF_ROOT_DIR}/dgl/src/WebViewWin32.cpp")
+      set_source_files_properties("${DPF_ROOT_DIR}/dgl/src/WebViewWin32.cpp"
+        PROPERTIES
+          COMPILE_FLAGS
+            $<IF:$<BOOL:${MSVC}>,/std:c++17,-std=gnu++17>)
+    endif()
   endif()
 
   dpf__add_dgl_system_libs()
@@ -861,6 +877,14 @@ function(dpf__add_dgl_opengl SHARED_RESOURCES USE_FILE_BROWSER USE_WEB_VIEW)
 
   if(USE_WEB_VIEW)
     target_compile_definitions(dgl-opengl PUBLIC "DGL_USE_WEB_VIEW")
+    if(WIN32)
+      target_sources(dgl-opengl PRIVATE
+        "${DPF_ROOT_DIR}/dgl/src/WebViewWin32.cpp")
+      set_source_files_properties("${DPF_ROOT_DIR}/dgl/src/WebViewWin32.cpp"
+        PROPERTIES
+          COMPILE_FLAGS
+            $<IF:$<BOOL:${MSVC}>,/std:c++17,-std=gnu++17>)
+    endif()
   endif()
 
   dpf__add_dgl_system_libs()
@@ -935,6 +959,14 @@ function(dpf__add_dgl_opengl3 SHARED_RESOURCES USE_FILE_BROWSER USE_WEB_VIEW)
 
   if(USE_WEB_VIEW)
     target_compile_definitions(dgl-opengl3 PUBLIC "DGL_USE_WEB_VIEW")
+    if(WIN32)
+      target_sources(dgl-opengl3 PRIVATE
+        "${DPF_ROOT_DIR}/dgl/src/WebViewWin32.cpp")
+      set_source_files_properties("${DPF_ROOT_DIR}/dgl/src/WebViewWin32.cpp"
+        PROPERTIES
+          COMPILE_FLAGS
+            $<IF:$<BOOL:${MSVC}>,/std:c++17,-std=gnu++17>)
+    endif()
   endif()
 
   dpf__add_dgl_system_libs()
@@ -1004,6 +1036,14 @@ function(dpf__add_dgl_vulkan SHARED_RESOURCES USE_FILE_BROWSER USE_WEB_VIEW)
 
   if(USE_WEB_VIEW)
     target_compile_definitions(dgl-vulkan PUBLIC "DGL_USE_WEB_VIEW")
+    if(WIN32)
+      target_sources(dgl-vulkan PRIVATE
+        "${DPF_ROOT_DIR}/dgl/src/WebViewWin32.cpp")
+      set_source_files_properties("${DPF_ROOT_DIR}/dgl/src/WebViewWin32.cpp"
+        PROPERTIES
+          COMPILE_FLAGS
+            $<IF:$<BOOL:${MSVC}>,/std:c++17,-std=gnu++17>)
+    endif()
   endif()
 
   dpf__add_dgl_system_libs()
@@ -1032,13 +1072,10 @@ function(dpf__add_plugin_specific_ui_sources NAME USE_WEB_VIEW)
   elseif(WIN32 AND USE_WEB_VIEW)
     target_sources("${NAME}" PRIVATE
       "${DPF_ROOT_DIR}/distrho/DistrhoUI_win32.cpp")
-    if (MSVC)
-      set_source_files_properties("${DPF_ROOT_DIR}/distrho/DistrhoUI_win32.cpp"
-        PROPERTIES COMPILE_FLAGS /std:c++17)
-    else()
-      set_source_files_properties("${DPF_ROOT_DIR}/distrho/DistrhoUI_win32.cpp"
-        PROPERTIES COMPILE_FLAGS -std=gnu++17)
-    endif()
+    set_source_files_properties("${DPF_ROOT_DIR}/distrho/DistrhoUI_win32.cpp"
+      PROPERTIES
+        COMPILE_FLAGS
+          $<IF:$<BOOL:${MSVC}>,/std:c++17,-std=gnu++17>)
     target_link_libraries("${NAME}" PRIVATE "ole32" "uuid")
   endif()
 endfunction()