Suppress libxml deprecations

Closes GH-20538

Author: iluuu1994

ext/dom/document.c

@@ -1437,12 +1437,16 @@ PHP_METHOD(DOMDocument, save)
 	doc_props = dom_get_doc_props(intern->document);
 	format = doc_props->formatoutput;
 	if (options & LIBXML_SAVE_NOEMPTYTAG) {
+		ZEND_DIAGNOSTIC_IGNORED_START("-Wdeprecated-declarations")
 		saveempty = xmlSaveNoEmptyTags;
 		xmlSaveNoEmptyTags = 1;
+		ZEND_DIAGNOSTIC_IGNORED_END
 	}
 	bytes = xmlSaveFormatFileEnc(file, docp, NULL, format);
 	if (options & LIBXML_SAVE_NOEMPTYTAG) {
+		ZEND_DIAGNOSTIC_IGNORED_START("-Wdeprecated-declarations")
 		xmlSaveNoEmptyTags = saveempty;
+		ZEND_DIAGNOSTIC_IGNORED_END
 	}
 	if (bytes == -1) {
 		RETURN_FALSE;
@@ -1489,12 +1493,16 @@ PHP_METHOD(DOMDocument, saveXML)
 			RETURN_FALSE;
 		}
 		if (options & LIBXML_SAVE_NOEMPTYTAG) {
+			ZEND_DIAGNOSTIC_IGNORED_START("-Wdeprecated-declarations")
 			saveempty = xmlSaveNoEmptyTags;
 			xmlSaveNoEmptyTags = 1;
+			ZEND_DIAGNOSTIC_IGNORED_END
 		}
 		xmlNodeDump(buf, docp, node, 0, format);
 		if (options & LIBXML_SAVE_NOEMPTYTAG) {
+			ZEND_DIAGNOSTIC_IGNORED_START("-Wdeprecated-declarations")
 			xmlSaveNoEmptyTags = saveempty;
+			ZEND_DIAGNOSTIC_IGNORED_END
 		}
 		mem = (xmlChar*) xmlBufferContent(buf);
 		if (!mem) {
@@ -1505,13 +1513,17 @@ PHP_METHOD(DOMDocument, saveXML)
 		xmlBufferFree(buf);
 	} else {
 		if (options & LIBXML_SAVE_NOEMPTYTAG) {
+			ZEND_DIAGNOSTIC_IGNORED_START("-Wdeprecated-declarations")
 			saveempty = xmlSaveNoEmptyTags;
 			xmlSaveNoEmptyTags = 1;
+			ZEND_DIAGNOSTIC_IGNORED_END
 		}
 		/* Encoding is handled from the encoding property set on the document */
 		xmlDocDumpFormatMemory(docp, &mem, &size, format);
 		if (options & LIBXML_SAVE_NOEMPTYTAG) {
+			ZEND_DIAGNOSTIC_IGNORED_START("-Wdeprecated-declarations")
 			xmlSaveNoEmptyTags = saveempty;
+			ZEND_DIAGNOSTIC_IGNORED_END
 		}
 		if (!size || !mem) {
 			RETURN_FALSE;

ext/libxml/libxml.c

@@ -429,9 +429,11 @@ php_libxml_input_buffer_create_filename(const char *URI, xmlCharEncoding enc)
 	/* Allocate the Input buffer front-end. */
 	ret = xmlAllocParserInputBuffer(enc);
 	if (ret != NULL) {
+		ZEND_DIAGNOSTIC_IGNORED_START("-Wdeprecated-declarations")
 		ret->context = context;
 		ret->readcallback = php_libxml_streams_IO_read;
 		ret->closecallback = php_libxml_streams_IO_close;
+		ZEND_DIAGNOSTIC_IGNORED_END
 	} else
 		php_libxml_streams_IO_close(context);
 
@@ -679,9 +681,12 @@ 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) {