diff --git a/nc_cxx.cmake b/nc_cxx.cmake
index f6c1e5b..97b30f1 100644
--- a/nc_cxx.cmake
+++ b/nc_cxx.cmake
@@ -24,7 +24,7 @@ append_compile_flag ("-fcolor-diagnostics")
 
 
 ###############################################################################
-append_compile_flag ("-std=c++1z")
+append_compile_flag ("-std=c++2a")
 append_compile_flag ("-fpermissive")
 append_compile_flag ("/std:c++latest")
 
diff --git a/nc_warnings.cmake b/nc_warnings.cmake
index 2232cda..0d157f4 100644
--- a/nc_warnings.cmake
+++ b/nc_warnings.cmake
@@ -71,6 +71,13 @@ append_compile_flag(-Wcovered-switch-default)
 
 append_compile_flag(-Wno-gnu-string-literal-operator-template)
 
+# gcc 8.1
+
+append_compile_flag(-Wmultistatement-macros)
+append_compile_flag(-Wcast-align=strict)
+append_compile_flag(-Wold-style-cast)
+
+
 # -------------------------------------------------------------------------
 # Required extensions
 #AX_APPEND_COMPILE_FLAGS([-Wgnu-flexible-array-union-member], [], [-Werror])