Split list in CMake instead of C++

That avoids the need for constexpr work, and therefore the need for an MSVC-specific extension

components/CMakeLists.txt

@@ -43,6 +43,9 @@ list (APPEND COMPONENT_FILES "${OpenMW_BINARY_DIR}/${VERSION_CPP_FILE}")
 # OSG plugin checker
 list(TRANSFORM USED_OSG_PLUGINS PREPEND "${CMAKE_SHARED_MODULE_PREFIX}" OUTPUT_VARIABLE USED_OSG_PLUGIN_FILENAMES)
 list(TRANSFORM USED_OSG_PLUGIN_FILENAMES APPEND "${CMAKE_SHARED_MODULE_SUFFIX}")
+list(TRANSFORM USED_OSG_PLUGIN_FILENAMES PREPEND "\"" OUTPUT_VARIABLE USED_OSG_PLUGIN_FILENAMES_FORMATTED)
+list(TRANSFORM USED_OSG_PLUGIN_FILENAMES_FORMATTED APPEND "\"")
+list(JOIN USED_OSG_PLUGIN_FILENAMES_FORMATTED ", " USED_OSG_PLUGIN_FILENAMES_FORMATTED)
 
 set(OSG_PLUGIN_CHECKER_CPP_FILE "components/misc/osgpluginchecker.cpp")
 configure_file("${OpenMW_SOURCE_DIR}/${OSG_PLUGIN_CHECKER_CPP_FILE}.in" "${OpenMW_BINARY_DIR}/${OSG_PLUGIN_CHECKER_CPP_FILE}")

components/misc/osgpluginchecker.cpp.in

@@ -7,6 +7,7 @@
 #include <osgDB/PluginQuery>
 
 #include <algorithm>
+#include <array>
 #include <filesystem>
 #include <string_view>
 
@@ -24,32 +25,14 @@ namespace Misc
 
     namespace
     {
-        std::string_view USED_OSG_PLUGIN_FILENAMES = "${USED_OSG_PLUGIN_FILENAMES}";
-
-        constexpr auto getRequiredOSGPlugins()
-        {
-            // TODO: this is only constexpr due to an MSVC extension, so doesn't work on GCC and Clang
-            // I tried replacing it with std::views::split_range, but we support compilers without that bit of C++20, and it wasn't obvious how to use the result as a string_view without C++23
-            std::vector<std::string_view> requiredOSGPlugins;
-            auto currentStart = USED_OSG_PLUGIN_FILENAMES.begin();
-            while (currentStart != USED_OSG_PLUGIN_FILENAMES.end())
-            {
-                auto currentEnd = std::find(currentStart, USED_OSG_PLUGIN_FILENAMES.end(), ';');
-                requiredOSGPlugins.emplace_back(currentStart, currentEnd);
-                if (currentEnd == USED_OSG_PLUGIN_FILENAMES.end())
-                    break;
-                currentStart = currentEnd + 1;
-            }
-            return requiredOSGPlugins;
-        }
+        constexpr auto USED_OSG_PLUGIN_FILENAMES = std::to_array<std::string_view>({${USED_OSG_PLUGIN_FILENAMES_FORMATTED}});
     }
 
     bool checkRequiredOSGPluginsArePresent()
     {
         auto availableOSGPlugins = osgDB::listAllAvailablePlugins();
-        auto requiredOSGPlugins = getRequiredOSGPlugins();
         bool haveAllPlugins = true;
-        for (std::string_view plugin : requiredOSGPlugins)
+        for (std::string_view plugin : USED_OSG_PLUGIN_FILENAMES)
         {
             if (std::find_if(availableOSGPlugins.begin(), availableOSGPlugins.end(), [&](std::string_view availablePlugin) {
 #ifdef OSG_USE_UTF8_FILENAME