Suppress libxml deprecations

Closes GH-20538

Author: iluuu1994

ext/dom/document.c

@@ -1595,12 +1595,16 @@ PHP_METHOD(DOMDocument, save)
 	libxml_doc_props const* doc_props = dom_get_doc_props_read_only(intern->document);
 	bool format = doc_props->formatoutput;
 	if (options & LIBXML_SAVE_NOEMPTYTAG) {
+		ZEND_DIAGNOSTIC_IGNORED_START("-Wdeprecated-declarations")
 		saveempty = xmlSaveNoEmptyTags;
 		xmlSaveNoEmptyTags = 1;
+		ZEND_DIAGNOSTIC_IGNORED_END
 	}
 	zend_long bytes = intern->document->handlers->dump_doc_to_file(file, docp, format, (const char *) docp->encoding);
 	if (options & LIBXML_SAVE_NOEMPTYTAG) {
+		ZEND_DIAGNOSTIC_IGNORED_START("-Wdeprecated-declarations")
 		xmlSaveNoEmptyTags = saveempty;
+		ZEND_DIAGNOSTIC_IGNORED_END
 	}
 	if (bytes == -1) {
 		RETURN_FALSE;
@@ -1641,10 +1645,14 @@ static void dom_document_save_xml(INTERNAL_FUNCTION_PARAMETERS, zend_class_entry
 
 		/* Save libxml2 global, override its value, and restore after saving (don't move me or risk breaking the state
 		 * w.r.t. the implicit return in DOM_GET_OBJ). */
+		ZEND_DIAGNOSTIC_IGNORED_START("-Wdeprecated-declarations")
 		old_xml_save_no_empty_tags = xmlSaveNoEmptyTags;
 		xmlSaveNoEmptyTags = (options & LIBXML_SAVE_NOEMPTYTAG) ? 1 : 0;
+		ZEND_DIAGNOSTIC_IGNORED_END
 		res = intern->document->handlers->dump_node_to_str(docp, node, format, (const char *) docp->encoding);
+		ZEND_DIAGNOSTIC_IGNORED_START("-Wdeprecated-declarations")
 		xmlSaveNoEmptyTags = old_xml_save_no_empty_tags;
+		ZEND_DIAGNOSTIC_IGNORED_END
 	} else {
 		int converted_options = XML_SAVE_AS_XML;
 		if (options & XML_SAVE_NO_DECL) {
@@ -1655,10 +1663,14 @@ static void dom_document_save_xml(INTERNAL_FUNCTION_PARAMETERS, zend_class_entry
 		}
 
 		/* Save libxml2 global, override its value, and restore after saving. */
+		ZEND_DIAGNOSTIC_IGNORED_START("-Wdeprecated-declarations")
 		old_xml_save_no_empty_tags = xmlSaveNoEmptyTags;
 		xmlSaveNoEmptyTags = (options & LIBXML_SAVE_NOEMPTYTAG) ? 1 : 0;
+		ZEND_DIAGNOSTIC_IGNORED_END
 		res = intern->document->handlers->dump_doc_to_str(docp, converted_options, (const char *) docp->encoding);
+		ZEND_DIAGNOSTIC_IGNORED_START("-Wdeprecated-declarations")
 		xmlSaveNoEmptyTags = old_xml_save_no_empty_tags;
+		ZEND_DIAGNOSTIC_IGNORED_END
 	}
 
 	if (!res) {

ext/dom/xml_serializer.c

@@ -1097,7 +1097,10 @@ static int dom_xml_serialize_element_node(
 	/* 14. If ns is the HTML namespace, and the node's list of children is empty, and the node's localName matches
 	 *     any one of the following void elements: ... */
 	if (element->children == NULL) {
-		if (xmlSaveNoEmptyTags) {
+		ZEND_DIAGNOSTIC_IGNORED_START("-Wdeprecated-declarations")
+		int saveNoEmptyTags = xmlSaveNoEmptyTags;
+		ZEND_DIAGNOSTIC_IGNORED_END
+		if (saveNoEmptyTags) {
 			/* Do nothing, use the <x></x> closing style. */
 		} else if (php_dom_ns_is_fast(element, php_dom_ns_is_html_magic_token)) {
 			size_t name_length = strlen((const char *) element->name);

ext/libxml/libxml.c

@@ -813,9 +813,12 @@ static xmlParserInputPtr php_libxml_external_entity_loader(const char *URL,
 				} else {
 					/* make stream not being closed when the zval is freed */
 					GC_ADDREF(stream->res);
+
+					ZEND_DIAGNOSTIC_IGNORED_START("-Wdeprecated-declarations")
 					pib->context = stream;
 					pib->readcallback = php_libxml_streams_IO_read;
 					pib->closecallback = php_libxml_streams_IO_close;
+					ZEND_DIAGNOSTIC_IGNORED_END
 
 					ret = xmlNewIOInputStream(context, pib, enc);
 					if (ret == NULL) {