Index: CMakeLists.txt
===================================================================
--- CMakeLists.txt
+++ CMakeLists.txt
@@ -221,9 +221,9 @@
     test_target_arch(i386 ${TARGET_32_BIT_CFLAGS})
   elseif("${LLVM_NATIVE_ARCH}" STREQUAL "PowerPC")
     test_target_arch(powerpc64 ${TARGET_64_BIT_CFLAGS})
-  elseif("${LLVM_NATIVE_ARCH}" STREQUAL "ARM")
-    test_target_arch(arm "")
   endif()
+  test_target_arch(arm "-march=armv7-a")
+  test_target_arch(aarch64 "-march=armv8-a")
 endif()
 
 # We support running instrumented tests when we're not cross compiling
@@ -353,14 +353,14 @@
 # Architectures supported by Sanitizer runtimes. Specific sanitizers may
 # support only subset of these (e.g. TSan works on x86_64 only).
 filter_available_targets(SANITIZER_COMMON_SUPPORTED_ARCH
-  x86_64 i386 powerpc64 arm)
-filter_available_targets(ASAN_SUPPORTED_ARCH x86_64 i386 powerpc64)
+  x86_64 i386 powerpc64 arm aarch64)
+filter_available_targets(ASAN_SUPPORTED_ARCH x86_64 i386 powerpc64 arm)
 filter_available_targets(DFSAN_SUPPORTED_ARCH x86_64)
 filter_available_targets(LSAN_SUPPORTED_ARCH x86_64)
 filter_available_targets(MSAN_SUPPORTED_ARCH x86_64)
-filter_available_targets(PROFILE_SUPPORTED_ARCH x86_64 i386 arm)
+filter_available_targets(PROFILE_SUPPORTED_ARCH x86_64 i386 arm aarch64)
 filter_available_targets(TSAN_SUPPORTED_ARCH x86_64)
-filter_available_targets(UBSAN_SUPPORTED_ARCH x86_64 i386)
+filter_available_targets(UBSAN_SUPPORTED_ARCH x86_64 i386 arm aarch64)
 
 add_subdirectory(include)
 
Index: lib/lsan/CMakeLists.txt
===================================================================
--- lib/lsan/CMakeLists.txt
+++ lib/lsan/CMakeLists.txt
@@ -19,7 +19,7 @@
 # The common files need to build on every arch supported by ASan.
 # (Even if they build into dummy object files.)
 filter_available_targets(LSAN_COMMON_SUPPORTED_ARCH
-  x86_64 i386 powerpc64 arm)
+  x86_64 i386 powerpc64 arm aarch64)
 
 add_custom_target(lsan)
 
Index: test/asan/CMakeLists.txt
===================================================================
--- test/asan/CMakeLists.txt
+++ test/asan/CMakeLists.txt
@@ -32,6 +32,21 @@
   list(APPEND ASAN_TESTSUITES ${CMAKE_CURRENT_BINARY_DIR}/ARMLinuxConfig)
 endif()
 
+if(CAN_TARGET_aarch64)
+  # This is only true if we are cross-compiling.
+  # Build all tests with host compiler and use host tools.
+  set(ASAN_TEST_TARGET_CC ${COMPILER_RT_TEST_COMPILER})
+  set(ASAN_TEST_TARGET_CFLAGS ${COMPILER_RT_TEST_COMPILER_CFLAGS})
+  set(ASAN_TEST_CONFIG_SUFFIX "-aarch64-linux")
+  set(ASAN_TEST_BITS "64")
+  set(ASAN_TEST_DYNAMIC False)
+  configure_lit_site_cfg(
+    ${CMAKE_CURRENT_SOURCE_DIR}/lit.site.cfg.in
+    ${CMAKE_CURRENT_BINARY_DIR}/AArch64LinuxConfig/lit.site.cfg
+    )
+  list(APPEND ASAN_TESTSUITES ${CMAKE_CURRENT_BINARY_DIR}/AArch64LinuxConfig)
+endif()
+
 if(CAN_TARGET_x86_64 OR CAN_TARGET_powerpc64)
   set(ASAN_TEST_CONFIG_SUFFIX "64")
   set(ASAN_TEST_BITS "64")
Index: test/ubsan/CMakeLists.txt
===================================================================
--- test/ubsan/CMakeLists.txt
+++ test/ubsan/CMakeLists.txt
@@ -5,10 +5,12 @@
   ${CMAKE_CURRENT_SOURCE_DIR}/lit.site.cfg.in
   ${CMAKE_CURRENT_BINARY_DIR}/UbsanConfig/lit.site.cfg)
 
-set(UBSAN_LIT_TEST_MODE "AddressSanitizer")
-configure_lit_site_cfg(
-  ${CMAKE_CURRENT_SOURCE_DIR}/lit.site.cfg.in
-  ${CMAKE_CURRENT_BINARY_DIR}/AsanConfig/lit.site.cfg)
+if(ASAN_SUPPORTED_ARCH)
+  set(UBSAN_LIT_TEST_MODE "AddressSanitizer")
+  configure_lit_site_cfg(
+    ${CMAKE_CURRENT_SOURCE_DIR}/lit.site.cfg.in
+    ${CMAKE_CURRENT_BINARY_DIR}/AsanConfig/lit.site.cfg)
+endif()
 
 set(UBSAN_TEST_DEPS ${SANITIZER_COMMON_LIT_TEST_DEPS})
 if(NOT COMPILER_RT_STANDALONE_BUILD)