Index: cmake/config-ix.cmake
===================================================================
--- cmake/config-ix.cmake
+++ cmake/config-ix.cmake
@@ -183,7 +183,7 @@
 filter_available_targets(PROFILE_SUPPORTED_ARCH x86_64 i386 i686 arm mips mips64
   mipsel mips64el aarch64 powerpc64 powerpc64le)
 filter_available_targets(TSAN_SUPPORTED_ARCH x86_64)
-filter_available_targets(UBSAN_SUPPORTED_ARCH x86_64 i386 i686 arm aarch64 mips mipsel)
+filter_available_targets(UBSAN_SUPPORTED_ARCH x86_64 i386 i686 arm aarch64 mips mipsel mips64 mips64el)
 
 if(ANDROID)
   set(OS_NAME "Android")
Index: lib/sanitizer_common/sanitizer_platform.h
===================================================================
--- lib/sanitizer_common/sanitizer_platform.h
+++ lib/sanitizer_common/sanitizer_platform.h
@@ -115,4 +115,9 @@
 # define SANITIZER_POINTER_FORMAT_LENGTH FIRST_32_SECOND_64(8, 12)
 #endif
 
+// __SIZEOF_INT128__ is defined in clang but not yet supported for mips
+#ifdef __mips64
+# undef __SIZEOF_INT128__
+#endif
+
 #endif // SANITIZER_PLATFORM_H