Index: cppbuiltin.c
===================================================================
RCS file: /cvsroot/src/external/gpl3/gcc/dist/gcc/cppbuiltin.c,v
retrieving revision 1.1.1.4
diff -u -r1.1.1.4 cppbuiltin.c
--- cppbuiltin.c	19 Jan 2019 10:14:18 -0000	1.1.1.4
+++ cppbuiltin.c	20 Sep 2019 16:52:56 -0000
@@ -93,6 +93,12 @@
   if (flag_sanitize & SANITIZE_ADDRESS)
     cpp_define (pfile, "__SANITIZE_ADDRESS__");
 
+  if (flag_sanitize & SANITIZE_UNDEFINED)
+    cpp_define (pfile, "__SANITIZE_UNDEFINED__");
+
+  if (flag_sanitize & SANITIZE_LEAK)
+    cpp_define (pfile, "__SANITIZE_UNDEFINED__");
+
   if (flag_sanitize & SANITIZE_THREAD)
     cpp_define (pfile, "__SANITIZE_THREAD__");