db2_instance_name-deprecation.diff

diff --git a/ext/pdo_odbc/pdo_odbc.c b/ext/pdo_odbc/pdo_odbc.c
index 0ff71a0cf8..c9d0be7580 100644
--- a/ext/pdo_odbc/pdo_odbc.c
+++ b/ext/pdo_odbc/pdo_odbc.c
@@ -92,6 +92,9 @@ PHP_MINIT_FUNCTION(pdo_odbc)
 		char *instance = INI_STR("pdo_odbc.db2_instance_name");
 		if (instance) {
 			char *env = malloc(sizeof("DB2INSTANCE=") + strlen(instance));
+
+			php_error_docref(NULL, E_DEPRECATED, "The pdo_odbc.db2_instance_name ini directive is deprecated and will be removed in the future");
+
 			if (!env) {
 				return FAILURE;
 			}