Index: test/asan/TestCases/Darwin/address-range-limit.mm
===================================================================
--- test/asan/TestCases/Darwin/address-range-limit.mm
+++ test/asan/TestCases/Darwin/address-range-limit.mm
@@ -3,6 +3,9 @@
 // RUN: %clangxx_asan %s -Wno-deprecated-declarations -flat_namespace -bundle -undefined suppress -o %t.bundle
 // RUN: %clangxx_asan %s -Wno-deprecated-declarations -o %t -framework Foundation && not %run %t 2>&1 | FileCheck %s
 
+// NSCreateObjectFileImageFromFile/NSLinkModule isn't available on iOS
+// UNSUPPORTED: ios
+
 #import <Foundation/Foundation.h>
 #import <mach-o/dyld.h>
 
Index: test/asan/TestCases/Darwin/atos-symbolizer.cc
===================================================================
--- test/asan/TestCases/Darwin/atos-symbolizer.cc
+++ test/asan/TestCases/Darwin/atos-symbolizer.cc
@@ -3,6 +3,9 @@
 // RUN: %clangxx_asan -O0 %s -o %t
 // RUN: %env_asan_opts=verbosity=2 ASAN_SYMBOLIZER_PATH=$(which atos) not %run %t 2>&1 | FileCheck %s
 
+// Path returned by `which atos` is invalid on iOS.
+// UNSUPPORTED: ios
+
 #include <stdlib.h>
 #include <string.h>
 int main(int argc, char **argv) {
Index: test/asan/TestCases/Darwin/dladdr-demangling.cc
===================================================================
--- test/asan/TestCases/Darwin/dladdr-demangling.cc
+++ test/asan/TestCases/Darwin/dladdr-demangling.cc
@@ -5,6 +5,9 @@
 // RUN: not %run %t 2>&1 | FileCheck %s
 // RUN: %env_asan_opts=verbosity=2 not %run sandbox-exec -p '(version 1)(allow default)(deny process-fork)' %t 2>&1 | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-DLADDR
 
+// sandbox-exec isn't available on iOS
+// UNSUPPORTED: ios
+
 #include <stdlib.h>
 
 class MyClass {
Index: test/asan/TestCases/Darwin/dyld_insert_libraries_reexec.cc
===================================================================
--- test/asan/TestCases/Darwin/dyld_insert_libraries_reexec.cc
+++ test/asan/TestCases/Darwin/dyld_insert_libraries_reexec.cc
@@ -1,6 +1,8 @@
 // When DYLD-inserting the ASan dylib from a different location than the
 // original, make sure we don't try to reexec.
 
+// UNSUPPORTED: ios
+
 // RUN: mkdir -p %T/dyld_insert_libraries_reexec
 // RUN: cp `%clang_asan %s -fsanitize=address -### 2>&1 \
 // RUN:   | grep "libclang_rt.asan_osx_dynamic.dylib" \
Index: test/asan/TestCases/Darwin/dyld_insert_libraries_remove.cc
===================================================================
--- test/asan/TestCases/Darwin/dyld_insert_libraries_remove.cc
+++ test/asan/TestCases/Darwin/dyld_insert_libraries_remove.cc
@@ -2,6 +2,8 @@
 // the ASan dylib from the environment variable (both when using an absolute
 // or relative path) and also that the other dylibs are left untouched.
 
+// UNSUPPORTED: ios
+
 // RUN: mkdir -p %T/dyld_insert_libraries_remove
 // RUN: cp `%clang_asan %s -fsanitize=address -### 2>&1 \
 // RUN:   | grep "libclang_rt.asan_osx_dynamic.dylib" \
Index: test/asan/TestCases/Darwin/haswell-symbolication.cc
===================================================================
--- test/asan/TestCases/Darwin/haswell-symbolication.cc
+++ test/asan/TestCases/Darwin/haswell-symbolication.cc
@@ -48,6 +48,7 @@
 
 // REQUIRES: x86-target-arch
 // REQUIRES: x86_64h
+// UNSUPPORTED: ios
 
 #include <sanitizer/common_interface_defs.h>
 #include <stdio.h>
Index: test/asan/TestCases/Darwin/interface_symbols_darwin.c
===================================================================
--- test/asan/TestCases/Darwin/interface_symbols_darwin.c
+++ test/asan/TestCases/Darwin/interface_symbols_darwin.c
@@ -31,4 +31,6 @@
 // RUN: echo "=== NOTE === If you see a mismatch below, please update sanitizer_interface.inc files."
 // RUN: diff %t.imports-sorted %t.exports-sorted
 
+// UNSUPPORTED: ios
+
 int main() { return 0; }
Index: test/asan/TestCases/Darwin/sandbox-symbolizer.cc
===================================================================
--- test/asan/TestCases/Darwin/sandbox-symbolizer.cc
+++ test/asan/TestCases/Darwin/sandbox-symbolizer.cc
@@ -12,6 +12,9 @@
 // RUN: not %run sandbox-exec -p '(version 1)(allow default)(deny mach-priv-task-port)' %t 2>&1 | FileCheck %s
 // RUN: env ASAN_SYMBOLIZER_PATH="" not %run sandbox-exec -p '(version 1)(allow default)(deny mach-priv-task-port)' %t 2>&1 | FileCheck %s
 
+// sandbox-exec isn't available on iOS
+// UNSUPPORTED: ios
+
 #include <stdlib.h>
 int main() {
   char *x = (char*)malloc(10 * sizeof(char));
Index: test/asan/TestCases/Darwin/suppressions-sandbox.cc
===================================================================
--- test/asan/TestCases/Darwin/suppressions-sandbox.cc
+++ test/asan/TestCases/Darwin/suppressions-sandbox.cc
@@ -8,6 +8,9 @@
 // RUN:   sandbox-exec -p '(version 1)(allow default)(deny process-fork)' \
 // RUN:   %run %t 2>&1 | FileCheck --check-prefix=CHECK-IGNORE %s
 
+// sandbox-exec isn't available on iOS
+// UNSUPPORTED: ios
+
 #include <CoreFoundation/CoreFoundation.h>
 
 int main() {
Index: test/asan/TestCases/Darwin/uuid.cc
===================================================================
--- test/asan/TestCases/Darwin/uuid.cc
+++ test/asan/TestCases/Darwin/uuid.cc
@@ -4,6 +4,9 @@
 // RUN: %clangxx_asan %s -o %t -fsanitize-recover=address
 // RUN: %env_asan_opts=print_module_map=2:halt_on_error=0     %run %t 2>&1 | FileCheck %s
 
+// We can't run system("otool") in the simulator.
+// UNSUPPORTED: ios
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>