Index: lib/ubsan/CMakeLists.txt
===================================================================
--- lib/ubsan/CMakeLists.txt
+++ lib/ubsan/CMakeLists.txt
@@ -17,7 +17,12 @@
 
 set(UBSAN_CFLAGS ${SANITIZER_COMMON_CFLAGS})
 append_no_rtti_flag(UBSAN_CFLAGS)
+append_list_if(COMPILER_RT_HAS_WGLOBAL_CONSTRUCTORS_FLAG -Wglobal-constructors
+               UBSAN_CFLAGS)
+
 set(UBSAN_CXXFLAGS ${SANITIZER_COMMON_CFLAGS})
+append_list_if(COMPILER_RT_HAS_WGLOBAL_CONSTRUCTORS_FLAG -Wglobal-constructors
+               UBSAN_CXXFLAGS)
 
 add_custom_target(ubsan)