[Web] Add Web-build specific stdout header

core/os/os.cpp

@@ -591,15 +591,20 @@ bool OS::has_feature(const String &p_feature) {
 	}
 #endif
 
-#ifdef THREADS_ENABLED
 	if (p_feature == "threads") {
+#ifdef THREADS_ENABLED
 		return true;
-	}
 #else
-	if (p_feature == "nothreads") {
+		return false;
-		return true;
-	}
 #endif
+	}
+	if (p_feature == "nothreads") {
+#ifdef THREADS_ENABLED
+		return false;
+#else
+		return true;
+#endif
+	}
 
 	if (_check_internal_feature_support(p_feature)) {
 		return true;

platform/web/SCsub

@@ -40,6 +40,7 @@ sys_env.AddJSLibraries(
     [
         "js/libs/library_godot_audio.js",
         "js/libs/library_godot_display.js",
+        "js/libs/library_godot_emscripten.js",
         "js/libs/library_godot_fetch.js",
         "js/libs/library_godot_webmidi.js",
         "js/libs/library_godot_os.js",

platform/web/detect.py

@@ -267,6 +267,7 @@ def configure(env: "SConsEnvironment"):
             print_warning("GDExtension support requires proxy_to_pthread=no, disabling proxy to pthread.")
             env["proxy_to_pthread"] = False
 
+        env.Append(CPPDEFINES=["WEB_DLINK_ENABLED"])
         env.Append(CCFLAGS=["-sSIDE_MODULE=2"])
         env.Append(LINKFLAGS=["-sSIDE_MODULE=2"])
         env.Append(CCFLAGS=["-fvisibility=hidden"])

platform/web/eslint.config.cjs

@@ -29,6 +29,7 @@ const emscriptenGlobals = {
 	'_free': true,
 	'_malloc': true,
 	'autoAddDeps': true,
+	'addToLibrary': true,
 	'addOnPostRun': true,
 	'getValue': true,
 	'lengthBytesUTF8': true,

platform/web/export/export_plugin.cpp

@@ -353,6 +353,11 @@ void EditorExportPlatformWeb::get_preset_features(const Ref<EditorExportPreset>
 	} else {
 		r_features->push_back("nothreads");
 	}
+	if (p_preset->get("variant/extensions_support").operator bool()) {
+		r_features->push_back("web_extensions");
+	} else {
+		r_features->push_back("web_noextensions");
+	}
 	r_features->push_back("wasm32");
 }
 

platform/web/godot_js.h

@@ -38,6 +38,9 @@
 extern "C" {
 #endif
 
+// Emscripten
+extern char *godot_js_emscripten_get_version();
+
 // Config
 extern void godot_js_config_locale_get(char *p_ptr, int p_ptr_max);
 extern void godot_js_config_canvas_id_get(char *p_ptr, int p_ptr_max);

platform/web/js/libs/library_godot_emscripten.js

@@ -0,0 +1,44 @@
+/**************************************************************************/
+/*  library_godot_emscripten.js                                           */
+/**************************************************************************/
+/*                         This file is part of:                          */
+/*                             GODOT ENGINE                               */
+/*                        https://godotengine.org                         */
+/**************************************************************************/
+/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
+/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
+/*                                                                        */
+/* Permission is hereby granted, free of charge, to any person obtaining  */
+/* a copy of this software and associated documentation files (the        */
+/* "Software"), to deal in the Software without restriction, including    */
+/* without limitation the rights to use, copy, modify, merge, publish,    */
+/* distribute, sublicense, and/or sell copies of the Software, and to     */
+/* permit persons to whom the Software is furnished to do so, subject to  */
+/* the following conditions:                                              */
+/*                                                                        */
+/* The above copyright notice and this permission notice shall be         */
+/* included in all copies or substantial portions of the Software.        */
+/*                                                                        */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,        */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF     */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY   */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,   */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE      */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
+/**************************************************************************/
+
+const GodotEmscripten = {
+	$GodotEmscripten__deps: ['$GodotRuntime'],
+	$GodotEmscripten: {},
+
+	godot_js_emscripten_get_version__proxy: 'sync',
+	godot_js_emscripten_get_version__sig: 'p',
+	godot_js_emscripten_get_version: function () {
+		// WARNING: The caller needs to free the string pointer.
+		const emscriptenVersionPtr = GodotRuntime.allocString('{{{ EMSCRIPTEN_VERSION }}}');
+		return emscriptenVersionPtr;
+	},
+};
+autoAddDeps(GodotEmscripten, '$GodotEmscripten');
+addToLibrary(GodotEmscripten);

platform/web/os_web.cpp

@@ -160,6 +160,22 @@ bool OS_Web::_check_internal_feature_support(const String &p_feature) {
 	if (p_feature == "web") {
 		return true;
 	}
+
+	if (p_feature == "web_extensions") {
+#ifdef WEB_DLINK_ENABLED
+		return true;
+#else
+		return false;
+#endif
+	}
+	if (p_feature == "web_noextensions") {
+#ifdef WEB_DLINK_ENABLED
+		return false;
+#else
+		return true;
+#endif
+	}
+
 	if (godot_js_os_has_feature(p_feature.utf8().get_data())) {
 		return true;
 	}

platform/web/web_main.cpp

@@ -104,6 +104,24 @@ void main_loop_callback() {
 	}
 }
 
+void print_web_header() {
+	// Emscripten.
+	char *emscripten_version_char = godot_js_emscripten_get_version();
+	String emscripten_version = vformat("Emscripten %s", emscripten_version_char);
+	memfree(emscripten_version_char);
+
+	// Build features.
+	String thread_support = OS::get_singleton()->has_feature("threads")
+			? "multi-threaded"
+			: "single-threaded";
+	String extensions_support = OS::get_singleton()->has_feature("web_extensions")
+			? "GDExtension support"
+			: "no GDExtension support";
+
+	Vector<String> build_configuration = { emscripten_version, thread_support, extensions_support };
+	print_line(vformat("Build configuration: %s.", String(", ").join(build_configuration)));
+}
+
 /// When calling main, it is assumed FS is setup and synced.
 extern EMSCRIPTEN_KEEPALIVE int godot_web_main(int argc, char *argv[]) {
 	os = new OS_Web();
@@ -128,6 +146,8 @@ extern EMSCRIPTEN_KEEPALIVE int godot_web_main(int argc, char *argv[]) {
 		return EXIT_FAILURE;
 	}
 
+	print_web_header();
+
 	main_started = true;
 
 	// Ease up compatibility.