Index: compiler-rt/trunk/cmake/config-ix.cmake
===================================================================
--- compiler-rt/trunk/cmake/config-ix.cmake
+++ compiler-rt/trunk/cmake/config-ix.cmake
@@ -192,7 +192,7 @@
 set(ALL_ASAN_SUPPORTED_ARCH ${X86} ${X86_64} ${ARM32} ${ARM64}
     ${MIPS32} ${MIPS64} ${PPC64} ${S390X})
 set(ALL_DFSAN_SUPPORTED_ARCH ${X86_64} ${MIPS64} ${ARM64})
-set(ALL_FUZZER_SUPPORTED_ARCH x86_64)
+set(ALL_FUZZER_SUPPORTED_ARCH ${X86_64} ${ARM64})
 
 if(APPLE)
   set(ALL_LSAN_SUPPORTED_ARCH ${X86} ${X86_64} ${MIPS64} ${ARM64})
Index: compiler-rt/trunk/lib/fuzzer/CMakeLists.txt
===================================================================
--- compiler-rt/trunk/lib/fuzzer/CMakeLists.txt
+++ compiler-rt/trunk/lib/fuzzer/CMakeLists.txt
@@ -50,9 +50,7 @@
   list(APPEND LIBFUZZER_CFLAGS -Dthread_local=__thread)
 endif()
 
-if(APPLE)
-  set(FUZZER_SUPPORTED_OS osx)
-endif()
+set(FUZZER_SUPPORTED_OS ${SANITIZER_COMMON_SUPPORTED_OS})
 
 add_compiler_rt_object_libraries(RTfuzzer
   OS ${FUZZER_SUPPORTED_OS}
Index: compiler-rt/trunk/lib/fuzzer/tests/CMakeLists.txt
===================================================================
--- compiler-rt/trunk/lib/fuzzer/tests/CMakeLists.txt
+++ compiler-rt/trunk/lib/fuzzer/tests/CMakeLists.txt
@@ -6,6 +6,10 @@
   -Werror
   -O2)
 
+if (APPLE)
+  set(FUZZER_SUPPORTED_OS osx)
+endif()
+
 add_custom_target(FuzzerUnitTests)
 set_target_properties(FuzzerUnitTests PROPERTIES FOLDER "Compiler-RT Tests")
 
Index: compiler-rt/trunk/test/fuzzer/CMakeLists.txt
===================================================================
--- compiler-rt/trunk/test/fuzzer/CMakeLists.txt
+++ compiler-rt/trunk/test/fuzzer/CMakeLists.txt
@@ -10,6 +10,8 @@
 set(EXCLUDE_FROM_ALL ON)
 
 add_custom_target(check-fuzzer)
+set(LIBFUZZER_TEST_IOS "0")
+pythonize_bool(LIBFUZZER_TEST_IOS)
 
 if(COMPILER_RT_INCLUDE_TESTS)
   # libFuzzer unit tests.
@@ -71,3 +73,27 @@
     test_fuzzer("static-libc++" DEPS cxx_static)
   endif()
 endif()
+
+if (APPLE)
+  set(EXCLUDE_FROM_ALL ON)
+
+  foreach(arch ${DARWIN_ios_ARCHS})
+    set(LIBFUZZER_TEST_IOS "1")
+    pythonize_bool(LIBFUZZER_TEST_IOS)
+    set(LIBFUZZER_TEST_TARGET_ARCH ${arch})
+    set(LIBFUZZER_TEST_FLAGS "-arch ${arch} -isysroot ${DARWIN_ios_SYSROOT} ${COMPILER_RT_TEST_COMPILER_CFLAGS}")
+    set(LIBFUZZER_TEST_CONFIG_SUFFIX "-${arch}-ios")
+    string(TOUPPER ${arch} ARCH_UPPER_CASE)
+    set(CONFIG_NAME "IOS${ARCH_UPPER_CASE}Config")
+    configure_lit_site_cfg(
+      ${CMAKE_CURRENT_SOURCE_DIR}/lit.site.cfg.in
+      ${CMAKE_CURRENT_BINARY_DIR}/${CONFIG_NAME}/lit.site.cfg
+      )
+    add_lit_testsuite(check-fuzzer-ios-${arch} "libFuzzer iOS ${arch} tests"
+      ${CMAKE_CURRENT_BINARY_DIR}/${CONFIG_NAME}/
+      DEPENDS ${LIBFUZZER_TEST_DEPS})
+
+  endforeach()
+
+  set(EXCLUDE_FROM_ALL OFF)
+endif()
Index: compiler-rt/trunk/test/fuzzer/lit.cfg
===================================================================
--- compiler-rt/trunk/test/fuzzer/lit.cfg
+++ compiler-rt/trunk/test/fuzzer/lit.cfg
@@ -2,7 +2,7 @@
 import sys
 import os
 
-config.name = "LLVMFuzzer"
+config.name = "libFuzzer" + config.name_suffix
 config.test_format = lit.formats.ShTest(True)
 config.suffixes = ['.test']
 config.test_source_root = os.path.dirname(__file__)
@@ -51,6 +51,7 @@
 
 def generate_compiler_cmd(is_cpp=True, fuzzer_enabled=True):
   compiler_cmd = config.clang
+  extra_cmd = config.target_flags
   if config.clang and config.stdlib == 'libc++':
     link_cmd = '-stdlib=libc++ -Wl,-rpath=%s' % config.llvm_library_dir
   elif config.clang and config.stdlib == 'static-libc++':
@@ -66,18 +67,14 @@
   if fuzzer_enabled:
     sanitizers.append('fuzzer')
   sanitizers_cmd = ('-fsanitize=%s' % ','.join(sanitizers))
-  if config.osx_sysroot_flag:
-    isysroot_cmd = config.osx_sysroot_flag
-  else:
-    isysroot_cmd = ''
   return " ".join([
     compiler_cmd,
     std_cmd,
     link_cmd,
     "-O2 -gline-tables-only",
-    isysroot_cmd,
     sanitizers_cmd,
-    "-I%s" % libfuzzer_src_root
+    "-I%s" % libfuzzer_src_root,
+    extra_cmd
   ])
 
 config.substitutions.append(('%cpp_compiler',
@@ -95,3 +92,9 @@
 config.substitutions.append(('%no_fuzzer_c_compiler',
       generate_compiler_cmd(is_cpp=False, fuzzer_enabled=False)
       ))
+
+if config.host_os == 'Darwin':
+  if config.target_arch in ["x86_64", "x86_64h"]:
+    config.parallelism_group = "darwin-64bit-sanitizer"
+  elif config.ios and not config.iossim:
+    config.parallelism_group = "darwin-ios-device-sanitizer"
Index: compiler-rt/trunk/test/fuzzer/lit.site.cfg.in
===================================================================
--- compiler-rt/trunk/test/fuzzer/lit.site.cfg.in
+++ compiler-rt/trunk/test/fuzzer/lit.site.cfg.in
@@ -6,6 +6,8 @@
 config.target_flags = "@LIBFUZZER_TEST_FLAGS@"
 config.c_compiler = "@LIBFUZZER_TEST_COMPILER@"
 config.stdlib = "@LIBFUZZER_TEST_STDLIB@"
+config.ios = @LIBFUZZER_TEST_IOS_PYBOOL@
+config.name_suffix = "@LIBFUZZER_TEST_CONFIG_SUFFIX@"
 
 config.osx_sysroot_flag = "@OSX_SYSROOT_FLAG@"
 config.cmake_binary_dir = "@CMAKE_BINARY_DIR@"