fix build errors on Linux with Clang 20 and GTK warnings (#12507)

* guard -Wno-error=enum-constexpr-conversion behind compiler flag check

* Fix: Suppress GTK critical warnings and prevent multiple URI scheme registrations in WebView

CMakeLists.txt

@@ -436,7 +436,11 @@ if (NOT MSVC AND ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" OR "${CMAKE_CXX_COMP
     endif()
 
     if((${CMAKE_CXX_COMPILER_ID} STREQUAL "Clang" OR ${CMAKE_CXX_COMPILER_ID} STREQUAL "AppleClang") AND ${CMAKE_CXX_COMPILER_VERSION} VERSION_GREATER 15)
-        add_compile_options(-Wno-error=enum-constexpr-conversion)
+        include(CheckCXXCompilerFlag)
+        check_cxx_compiler_flag(-Wno-error=enum-constexpr-conversion HAS_WNO_ERROR_ENUM_CONSTEXPR_CONV)
+        if(HAS_WNO_ERROR_ENUM_CONSTEXPR_CONV)
+            add_compile_options(-Wno-error=enum-constexpr-conversion)
+        endif()
     endif()
 
     #GCC generates loads of -Wunknown-pragmas when compiling igl. The fix is not easy due to a bug in gcc, see

src/slic3r/GUI/GUI_App.cpp

@@ -2697,6 +2697,18 @@ bool GUI_App::on_init_inner()
     g_object_set (gtk_settings_get_default (), "gtk-menu-images", TRUE, NULL);
 #endif
 
+#if defined(__WXGTK20__) || defined(__WXGTK3__)
+    // Suppress harmless GTK critical warnings from the GTK3/wxWidgets interaction.
+    // These include widget allocation on hidden widgets and events on unrealized widgets.
+    g_log_set_handler("Gtk", G_LOG_LEVEL_CRITICAL,
+        [](const gchar *log_domain, GLogLevelFlags log_level, const gchar *message, gpointer user_data) {
+            if (message && (strstr(message, "gtk_widget_set_allocation") ||
+                            strstr(message, "WIDGET_REALIZED_FOR_EVENT")))
+                return;
+            g_log_default_handler(log_domain, log_level, message, user_data);
+        }, nullptr);
+#endif
+
 #ifdef WIN32
     //BBS set crash log folder
     CBaseException::set_log_folder(data_dir());

src/slic3r/GUI/Widgets/Label.cpp

@@ -65,20 +65,20 @@ void Label::initSysFont()
     wxString font_path = wxString::FromUTF8(resource_path + "/fonts/HarmonyOS_Sans_SC_Bold.ttf");
     bool result = wxFont::AddPrivateFont(font_path);
     // BOOST_LOG_TRIVIAL(info) << boost::format("add font of HarmonyOS_Sans_SC_Bold returns %1%")%result;
-    printf("add font of HarmonyOS_Sans_SC_Bold returns %d\n", result);
+    // printf("add font of HarmonyOS_Sans_SC_Bold returns %d\n", result);
     font_path = wxString::FromUTF8(resource_path + "/fonts/HarmonyOS_Sans_SC_Regular.ttf");
     result = wxFont::AddPrivateFont(font_path);
     // BOOST_LOG_TRIVIAL(info) << boost::format("add font of HarmonyOS_Sans_SC_Regular returns %1%")%result;
-    printf("add font of HarmonyOS_Sans_SC_Regular returns %d\n", result);
+    // printf("add font of HarmonyOS_Sans_SC_Regular returns %d\n", result);
     // Adding NanumGothic Regular and Bold
     font_path = wxString::FromUTF8(resource_path + "/fonts/NanumGothic-Regular.ttf");
     result = wxFont::AddPrivateFont(font_path);
     // BOOST_LOG_TRIVIAL(info) << boost::format("add font of NanumGothic-Regular returns %1%")%result;
-    printf("add font of NanumGothic-Regular returns %d\n", result);
+    // printf("add font of NanumGothic-Regular returns %d\n", result);
     font_path = wxString::FromUTF8(resource_path + "/fonts/NanumGothic-Bold.ttf");
     result = wxFont::AddPrivateFont(font_path);
     // BOOST_LOG_TRIVIAL(info) << boost::format("add font of NanumGothic-Bold returns %1%")%result;
-    printf("add font of NanumGothic-Bold returns %d\n", result);
+    // printf("add font of NanumGothic-Bold returns %d\n", result);
 #endif
     Head_48 = Label::sysFont(48, true);
     Head_32 = Label::sysFont(32, true);

src/slic3r/GUI/Widgets/WebView.cpp

@@ -277,10 +277,15 @@ wxWebView* WebView::CreateWebView(wxWindow * parent, wxString const & url)
         // And the memory: file system
         webView->RegisterHandler(wxSharedPtr<wxWebViewHandler>(new wxWebViewFSHandler("memory")));
 #else
-        // With WKWebView handlers need to be registered before creation
+        // With WKWebView handlers need to be registered before creation.
-        webView->RegisterHandler(wxSharedPtr<wxWebViewHandler>(new wxWebViewArchiveHandler("wxfs")));
+        // On Linux (WebKit2GTK), URI schemes are registered globally and can only
-        // And the memory: file system
+        // be registered once, so guard against multiple registrations.
-        webView->RegisterHandler(wxSharedPtr<wxWebViewHandler>(new wxWebViewFSHandler("memory")));
+        static bool s_schemes_registered = false;
+        if (!s_schemes_registered) {
+            webView->RegisterHandler(wxSharedPtr<wxWebViewHandler>(new wxWebViewArchiveHandler("wxfs")));
+            webView->RegisterHandler(wxSharedPtr<wxWebViewHandler>(new wxWebViewFSHandler("memory")));
+            s_schemes_registered = true;
+        }
         webView->Create(parent, wxID_ANY, url2, wxDefaultPosition, wxDefaultSize, wxBORDER_NONE);
         webView->SetUserAgent(wxString::Format("Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) BBL-Slicer/v%s (%s) BBL-Language/%s",
                                                SLIC3R_VERSION, Slic3r::GUI::wxGetApp().dark_mode() ? "dark" : "light", language_code.mb_str()));