Index: test/tsan/CMakeLists.txt
===================================================================
--- test/tsan/CMakeLists.txt
+++ test/tsan/CMakeLists.txt
@@ -1,3 +1,5 @@
+set(TSAN_LIT_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR})
+
 set(TSAN_TEST_DEPS ${SANITIZER_COMMON_LIT_TEST_DEPS})
 if(${COMPILER_RT_DEFAULT_TARGET_ARCH} MATCHES "x86_64")
   list(APPEND TSAN_TEST_DEPS GotsanRuntimeCheck)
@@ -35,6 +37,44 @@
   list(APPEND TSAN_TESTSUITES ${CMAKE_CURRENT_BINARY_DIR}/${CONFIG_NAME})
 endforeach()
 
+# iOS and iOS simulator test suites
+# These are not added into "check-all", in order to run these tests, you have to
+# manually call (from the build directory).  They also require that an extra env
+# variable to select which iOS device or simulator to use, e.g.:
+# $ SANITIZER_IOSSIM_TEST_DEVICE_IDENTIFIER=BBE44C1C-8AAA-4000-8D06-91C89ED58172
+# $ ./bin/llvm-lit ./projects/compiler-rt/test/tsan/IOSSimX86_64Config
+if(APPLE)
+  set(TSAN_TEST_TARGET_CC ${COMPILER_RT_TEST_COMPILER})
+  set(TSAN_TEST_IOS "1")
+  pythonize_bool(TSAN_TEST_IOS)
+
+  set(arch "x86_64")
+  set(TSAN_TEST_IOSSIM "1")
+  pythonize_bool(TSAN_TEST_IOSSIM)
+  set(TSAN_TEST_TARGET_ARCH ${arch})
+  set(TSAN_TEST_TARGET_CFLAGS "-arch ${arch} -isysroot ${DARWIN_iossim_SYSROOT} ${COMPILER_RT_TEST_COMPILER_CFLAGS}")
+  set(TSAN_TEST_CONFIG_SUFFIX "-${arch}-iossim")
+  string(TOUPPER ${arch} ARCH_UPPER_CASE)
+  set(CONFIG_NAME "IOSSim${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
+    )
+
+  set(arch "arm64")
+  set(TSAN_TEST_IOSSIM "0")
+  pythonize_bool(TSAN_TEST_IOSSIM)
+  set(TSAN_TEST_TARGET_ARCH ${arch})
+  set(TSAN_TEST_TARGET_CFLAGS "-arch ${arch} -isysroot ${DARWIN_ios_SYSROOT} ${COMPILER_RT_TEST_COMPILER_CFLAGS}")
+  set(TSAN_TEST_CONFIG_SUFFIX "-${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
+    )
+endif()
+
 if(COMPILER_RT_INCLUDE_TESTS)
   configure_lit_site_cfg(
     ${CMAKE_CURRENT_SOURCE_DIR}/Unit/lit.site.cfg.in
Index: test/tsan/Darwin/dlopen.cc
===================================================================
--- test/tsan/Darwin/dlopen.cc
+++ test/tsan/Darwin/dlopen.cc
@@ -4,6 +4,8 @@
 
 // REQUIRES: osx-autointerception
 
+// XFAIL: ios
+
 // RUN: %clangxx_tsan %s -o %t.so -shared -DSHARED_LIB
 // RUN: %clangxx_tsan -fno-sanitize=thread %s -o %t
 
Index: test/tsan/deep_stack1.cc
===================================================================
--- test/tsan/deep_stack1.cc
+++ test/tsan/deep_stack1.cc
@@ -24,6 +24,8 @@
   return 0;
 }
 
+#define ROUND_UP(N, M) (((N + M - 1) / M) * M)
+
 int main() {
   barrier_init(&barrier, 2);
   N = 50000;
@@ -31,7 +33,10 @@
   pthread_t t;
   pthread_attr_t a;
   pthread_attr_init(&a);
-  pthread_attr_setstacksize(&a, N * 256 + (1 << 20));
+  size_t stack_size = N * 256 + (1 << 20);
+  stack_size = ROUND_UP(stack_size, 0x10000);  // round the stack size to 64k
+  int ret = pthread_attr_setstacksize(&a, stack_size);
+  if (ret) abort();
   pthread_create(&t, &a, Thread, 0);
 #ifdef ORDER2
   barrier_wait(&barrier);
Index: test/tsan/ignore_lib0.cc
===================================================================
--- test/tsan/ignore_lib0.cc
+++ test/tsan/ignore_lib0.cc
@@ -11,6 +11,8 @@
 // Some aarch64 kernels do not support non executable write pages
 // REQUIRES: stable-runtime
 
+// XFAIL: ios
+
 #ifndef LIB
 
 extern "C" void libfunc();
Index: test/tsan/lit.cfg
===================================================================
--- test/tsan/lit.cfg
+++ test/tsan/lit.cfg
@@ -66,7 +66,7 @@
                           "-Wl,-rpath=%s" % libcxx_libdir]
 
 def build_invocation(compile_flags):
-  return " " + " ".join([config.clang] + compile_flags) + " "
+  return " " + " ".join([config.compile_wrapper, config.clang] + compile_flags) + " "
 
 config.substitutions.append( ("%clang_tsan ", build_invocation(clang_tsan_cflags)) )
 config.substitutions.append( ("%clangxx_tsan ", build_invocation(clang_tsan_cxxflags)) )
Index: test/tsan/lit.site.cfg.in
===================================================================
--- test/tsan/lit.site.cfg.in
+++ test/tsan/lit.site.cfg.in
@@ -1,7 +1,10 @@
 @LIT_SITE_CFG_IN_HEADER@
 
 config.name_suffix = "@TSAN_TEST_CONFIG_SUFFIX@"
+config.tsan_lit_source_dir = "@TSAN_LIT_SOURCE_DIR@"
 config.has_libcxx = @TSAN_HAS_LIBCXX@
+config.ios = @TSAN_TEST_IOS_PYBOOL@
+config.iossim = @TSAN_TEST_IOSSIM_PYBOOL@
 config.target_cflags = "@TSAN_TEST_TARGET_CFLAGS@"
 config.target_arch = "@TSAN_TEST_TARGET_ARCH@"