Index: cmake/config-ix.cmake
===================================================================
--- cmake/config-ix.cmake
+++ cmake/config-ix.cmake
@@ -196,7 +196,7 @@
 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})
@@ -426,7 +426,7 @@
     SANITIZER_COMMON_SUPPORTED_ARCH)
   list_intersect(FUZZER_SUPPORTED_ARCH
     ALL_FUZZER_SUPPORTED_ARCH
-    ALL_SANITIZER_COMMON_SUPPORTED_ARCH)
+    SANITIZER_COMMON_SUPPORTED_ARCH)
   list_intersect(XRAY_SUPPORTED_ARCH
     ALL_XRAY_SUPPORTED_ARCH
     SANITIZER_COMMON_SUPPORTED_ARCH)
Index: lib/fuzzer/CMakeLists.txt
===================================================================
--- lib/fuzzer/CMakeLists.txt
+++ 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: lib/fuzzer/tests/CMakeLists.txt
===================================================================
--- lib/fuzzer/tests/CMakeLists.txt
+++ 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")
 
@@ -22,35 +26,35 @@
   list(APPEND LIBFUZZER_UNITTEST_CFLAGS -nostdinc++ -D_LIBCPP_ABI_VERSION=Fuzzer)
 endif()
 
-foreach(arch ${FUZZER_SUPPORTED_ARCH})
-  set(LIBFUZZER_TEST_RUNTIME RTFuzzerTest.${arch})
-  if(APPLE)
-    set(LIBFUZZER_TEST_RUNTIME_OBJECTS
-      $<TARGET_OBJECTS:RTfuzzer.osx>)
-  else()
-    set(LIBFUZZER_TEST_RUNTIME_OBJECTS
-      $<TARGET_OBJECTS:RTfuzzer.${arch}>)
-  endif()
-  add_library(${LIBFUZZER_TEST_RUNTIME} STATIC
-    ${LIBFUZZER_TEST_RUNTIME_OBJECTS})
-  set_target_properties(${LIBFUZZER_TEST_RUNTIME} PROPERTIES
-    ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
-    FOLDER "Compiler-RT Runtime tests")
-
-  if("${CMAKE_SYSTEM_NAME}" STREQUAL "Linux" AND COMPILER_RT_LIBCXX_PATH)
-    set(LIBFUZZER_TEST_RUNTIME_DEPS libcxx_fuzzer_${arch}-build)
-    set(LIBFUZZER_TEST_RUNTIME_CFLAGS -isystem ${COMPILER_RT_LIBCXX_PATH}/include)
-    set(LIBFUZZER_TEST_RUNTIME_LINK_FLAGS ${LIBCXX_${arch}_PREFIX}/lib/libc++.a)
-  endif()
-
-  set(FuzzerTestObjects)
-  generate_compiler_rt_tests(FuzzerTestObjects
-    FuzzerUnitTests "Fuzzer-${arch}-Test" ${arch}
-    SOURCES FuzzerUnittest.cpp ${COMPILER_RT_GTEST_SOURCE}
-    RUNTIME ${LIBFUZZER_TEST_RUNTIME}
-    DEPS gtest ${LIBFUZZER_TEST_RUNTIME_DEPS}
-    CFLAGS ${LIBFUZZER_UNITTEST_CFLAGS} ${LIBFUZZER_TEST_RUNTIME_CFLAGS}
-    LINK_FLAGS ${LIBFUZZER_UNITTEST_LINK_FLAGS} ${LIBFUZZER_TEST_RUNTIME_LINK_FLAGS})
-  set_target_properties(FuzzerUnitTests PROPERTIES
-    RUNTIME_OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
-endforeach()
+set(arch "x86_64")
+
+set(LIBFUZZER_TEST_RUNTIME RTFuzzerTest.${arch})
+if(APPLE)
+  set(LIBFUZZER_TEST_RUNTIME_OBJECTS
+    $<TARGET_OBJECTS:RTfuzzer.osx>)
+else()
+  set(LIBFUZZER_TEST_RUNTIME_OBJECTS
+    $<TARGET_OBJECTS:RTfuzzer.${arch}>)
+endif()
+add_library(${LIBFUZZER_TEST_RUNTIME} STATIC
+  ${LIBFUZZER_TEST_RUNTIME_OBJECTS})
+set_target_properties(${LIBFUZZER_TEST_RUNTIME} PROPERTIES
+  ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
+  FOLDER "Compiler-RT Runtime tests")
+
+if("${CMAKE_SYSTEM_NAME}" STREQUAL "Linux" AND COMPILER_RT_LIBCXX_PATH)
+  set(LIBFUZZER_TEST_RUNTIME_DEPS libcxx_fuzzer_${arch}-build)
+  set(LIBFUZZER_TEST_RUNTIME_CFLAGS -isystem ${COMPILER_RT_LIBCXX_PATH}/include)
+  set(LIBFUZZER_TEST_RUNTIME_LINK_FLAGS ${LIBCXX_${arch}_PREFIX}/lib/libc++.a)
+endif()
+
+set(FuzzerTestObjects)
+generate_compiler_rt_tests(FuzzerTestObjects
+  FuzzerUnitTests "Fuzzer-${arch}-Test" ${arch}
+  SOURCES FuzzerUnittest.cpp ${COMPILER_RT_GTEST_SOURCE}
+  RUNTIME ${LIBFUZZER_TEST_RUNTIME}
+  DEPS gtest ${LIBFUZZER_TEST_RUNTIME_DEPS}
+  CFLAGS ${LIBFUZZER_UNITTEST_CFLAGS} ${LIBFUZZER_TEST_RUNTIME_CFLAGS}
+  LINK_FLAGS ${LIBFUZZER_UNITTEST_LINK_FLAGS} ${LIBFUZZER_TEST_RUNTIME_LINK_FLAGS})
+set_target_properties(FuzzerUnitTests PROPERTIES
+  RUNTIME_OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
Index: test/fuzzer/CMakeLists.txt
===================================================================
--- test/fuzzer/CMakeLists.txt
+++ test/fuzzer/CMakeLists.txt
@@ -1,5 +1,4 @@
 set(LIBFUZZER_TEST_DEPS ${SANITIZER_COMMON_LIT_TEST_DEPS})
-list(REMOVE_ITEM LIBFUZZER_TEST_DEPS SanitizerLintCheck)
 if (NOT COMPILER_RT_STANDALONE_BUILD)
   list(APPEND LIBFUZZER_TEST_DEPS fuzzer asan ubsan)
 endif()
@@ -11,6 +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.
@@ -50,14 +51,16 @@
       ${CMAKE_CURRENT_BINARY_DIR}/${CONFIG_NAME}/lit.site.cfg
       )
 
-    add_lit_testsuite(check-fuzzer-${stdlib_name} "Running Fuzzer ${stdlib} tests"
-      ${CMAKE_CURRENT_BINARY_DIR}/${CONFIG_NAME}
+    add_lit_testsuite(check-fuzzer-${stdlib_name}-${arch}
+      "Running Fuzzer ${stdlib} tests"
+      ${CMAKE_CURRENT_BINARY_DIR}/${CONFIG_NAME}/
       DEPENDS ${LIBFUZZER_TEST_DEPS})
     if(TEST_DEPS)
-      add_dependencies(check-fuzzer-${stdlib_name} ${TEST_DEPS})
+      add_dependencies(check-fuzzer-${stdlib_name}-${arch} ${TEST_DEPS})
     endif()
-    set_target_properties(check-fuzzer-${stdlib_name} PROPERTIES FOLDER "Compiler-RT Tests")
-    add_dependencies(check-fuzzer check-fuzzer-${stdlib_name})
+    set_target_properties(check-fuzzer-${stdlib_name}-${arch}
+        PROPERTIES FOLDER "Compiler-RT Tests")
+    add_dependencies(check-fuzzer check-fuzzer-${stdlib_name}-${arch})
   endforeach()
 endmacro()
 
@@ -70,3 +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_TARGET_CFLAGS "-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: test/fuzzer/afl-driver-extra-stats.test
===================================================================
--- test/fuzzer/afl-driver-extra-stats.test
+++ test/fuzzer/afl-driver-extra-stats.test
@@ -1,3 +1,4 @@
+XFAIL: ios
 RUN: %no_fuzzer_cpp_compiler -fno-sanitize-coverage=edge,trace-cmp,indirect-calls,8bit-counters,trace-pc-guard %S/AFLDriverTest.cpp %libfuzzer_src/afl/afl_driver.cpp -o %t-AFLDriverTest
 
 ; Test that not specifying an extra stats file isn't broken.
Index: test/fuzzer/afl-driver-stderr.test
===================================================================
--- test/fuzzer/afl-driver-stderr.test
+++ test/fuzzer/afl-driver-stderr.test
@@ -1,3 +1,4 @@
+XFAIL: ios
 UNSUPPORTED: freebsd
 RUN: %no_fuzzer_cpp_compiler -fno-sanitize-coverage=edge,trace-cmp,indirect-calls,8bit-counters,trace-pc-guard %S/AFLDriverTest.cpp %libfuzzer_src/afl/afl_driver.cpp -o %t-AFLDriverTest
 
Index: test/fuzzer/counters.test
===================================================================
--- test/fuzzer/counters.test
+++ test/fuzzer/counters.test
@@ -1,3 +1,4 @@
+XFAIL: ios
 RUN: %cpp_compiler %S/CounterTest.cpp -o %t-CounterTest
 RUN: not %run %t-CounterTest  -max_len=6 -seed=1 -timeout=15 2>&1 | FileCheck %s --check-prefix=COUNTERS
 
Index: test/fuzzer/dso.test
===================================================================
--- test/fuzzer/dso.test
+++ test/fuzzer/dso.test
@@ -1,6 +1,6 @@
-RUN: %cpp_compiler %S/DSO1.cpp -fPIC -shared -o %t-DSO1.so
-RUN: %cpp_compiler %S/DSO2.cpp -fPIC -shared -o %t-DSO2.so
-RUN: %cpp_compiler %S/DSOTestMain.cpp %S/DSOTestExtra.cpp -L. %t-DSO1.so %t-DSO2.so -o %t-DSOTest
+RUN: %cpp_compiler %S/DSO1.cpp -fPIC -shared -o %dynamiclib1 %ld_flags_rpath_so1
+RUN: %cpp_compiler %S/DSO2.cpp -fPIC -shared -o %dynamiclib2 %ld_flags_rpath_so2
+RUN: %cpp_compiler %S/DSOTestMain.cpp %S/DSOTestExtra.cpp %ld_flags_rpath_exe1 %ld_flags_rpath_exe2 -o %t-DSOTest
 
 RUN: not %run %t-DSOTest 2>&1 | FileCheck %s --check-prefix=DSO
 DSO: INFO: Loaded 3 modules
Index: test/fuzzer/dump_coverage.test
===================================================================
--- test/fuzzer/dump_coverage.test
+++ test/fuzzer/dump_coverage.test
@@ -1,7 +1,7 @@
 UNSUPPORTED: freebsd
-RUN: %cpp_compiler -fsanitize-coverage=0 -fsanitize-coverage=trace-pc-guard %S/DSO1.cpp -fPIC -shared -o %t-DSO1.so
-RUN: %cpp_compiler -fsanitize-coverage=0 -fsanitize-coverage=trace-pc-guard %S/DSO2.cpp -fPIC -shared -o %t-DSO2.so
-RUN: %cpp_compiler -fsanitize-coverage=0 -fsanitize-coverage=trace-pc-guard %S/DSOTestMain.cpp %S/DSOTestExtra.cpp -L. %t-DSO1.so %t-DSO2.so -o %t-DSOTest
+RUN: %cpp_compiler -fsanitize-coverage=0 -fsanitize-coverage=trace-pc-guard %S/DSO1.cpp -fPIC -shared -o %dynamiclib1 %ld_flags_rpath_so1
+RUN: %cpp_compiler -fsanitize-coverage=0 -fsanitize-coverage=trace-pc-guard %S/DSO2.cpp -fPIC -shared -o %dynamiclib2 %ld_flags_rpath_so2
+RUN: %cpp_compiler -fsanitize-coverage=0 -fsanitize-coverage=trace-pc-guard %S/DSOTestMain.cpp %S/DSOTestExtra.cpp %ld_flags_rpath_exe1 %ld_flags_rpath_exe2 -o %t-DSOTest
 
 RUN: %cpp_compiler -fsanitize-coverage=0 -fsanitize-coverage=trace-pc-guard %S/NullDerefTest.cpp -o %t-NullDerefTest
 
@@ -15,7 +15,7 @@
 SANCOV: LLVMFuzzerTestOneInput
 
 DSO: SanitizerCoverage: {{.*}}DSOTest.{{.*}}.sancov: {{.*}} PCs written
-DSO-DAG: SanitizerCoverage: {{.*}}DSO1.{{.*}}.sancov: {{.*}} PCs written
-DSO-DAG: SanitizerCoverage: {{.*}}DSO2.{{.*}}.sancov: {{.*}} PCs written
+DSO-DAG: SanitizerCoverage: {{.*}}1.{{.*}}.sancov: {{.*}} PCs written
+DSO-DAG: SanitizerCoverage: {{.*}}2.{{.*}}.sancov: {{.*}} PCs written
 
 NOCOV-NOT: SanitizerCoverage: {{.*}} PCs written
Index: test/fuzzer/fuzzer-fdmask.test
===================================================================
--- test/fuzzer/fuzzer-fdmask.test
+++ test/fuzzer/fuzzer-fdmask.test
@@ -6,23 +6,23 @@
 RUN: %run %t-SpamyTest -runs=1 -close_fd_mask=2 2>&1 | FileCheck %s --check-prefix=FD_MASK_2
 RUN: %run %t-SpamyTest -runs=1 -close_fd_mask=3 2>&1 | FileCheck %s --check-prefix=FD_MASK_3
 
-FD_MASK_0: PRINTF_STDOUT
-FD_MASK_0: PRINTF_STDERR
-FD_MASK_0: STREAM_COUT
-FD_MASK_0: STREAM_CERR
-FD_MASK_0: INITED
+FD_MASK_0-DAG: PRINTF_STDOUT
+FD_MASK_0-DAG: PRINTF_STDERR
+FD_MASK_0-DAG: STREAM_COUT
+FD_MASK_0-DAG: STREAM_CERR
+FD_MASK_0-DAG: INITED
 
 FD_MASK_1-NOT: PRINTF_STDOUT
-FD_MASK_1: PRINTF_STDERR
+FD_MASK_1-DAG: PRINTF_STDERR
 FD_MASK_1-NOT: STREAM_COUT
-FD_MASK_1: STREAM_CERR
-FD_MASK_1: INITED
+FD_MASK_1-DAG: STREAM_CERR
+FD_MASK_1-DAG: INITED
 
-FD_MASK_2: PRINTF_STDOUT
+FD_MASK_2-DAG: PRINTF_STDOUT
+FD_MASK_2-DAG: STREAM_COUT
+FD_MASK_2-DAG: INITED
 FD_MASK_2-NOT: PRINTF_STDERR
-FD_MASK_2: STREAM_COUT
-FD_MASK_2-NOTE: STREAM_CERR
-FD_MASK_2: INITED
+FD_MASK_2-NOT: STREAM_CERR
 
 FD_MASK_3-NOT: PRINTF_STDOUT
 FD_MASK_3-NOT: PRINTF_STDERR
Index: test/fuzzer/fuzzer-printcovpcs.test
===================================================================
--- test/fuzzer/fuzzer-printcovpcs.test
+++ test/fuzzer/fuzzer-printcovpcs.test
@@ -1,3 +1,4 @@
+XFAIL: ios
 RUN: %cpp_compiler %S/SimpleTest.cpp -o %t-SimpleTest
 RUN: not %run %t-SimpleTest -print_pcs=1 -seed=1 2>&1 | FileCheck %s --check-prefix=PCS
 PCS-NOT: NEW_PC
Index: test/fuzzer/lit.cfg
===================================================================
--- test/fuzzer/lit.cfg
+++ 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__)
@@ -47,25 +47,42 @@
 
 config.substitutions.append(('%build_dir', config.cmake_binary_dir))
 libfuzzer_src_root = os.path.join(config.compiler_rt_src_root, "lib", "fuzzer")
+include_root = os.path.join(config.compiler_rt_src_root, "include")
 config.substitutions.append(('%libfuzzer_src', libfuzzer_src_root))
 
 def generate_compiler_cmd(is_cpp=True, fuzzer_enabled=True):
-  compiler_cmd = config.c_compiler
+  compiler_cmd = config.clang
+  extra_cmd = config.target_cflags
   if config.clang and config.stdlib == 'libc++':
-    link_cmd = '-stdlib=libc++ -Wl,-rpath=%s' % config.llvm_library_dir
+    lib_cmd = '-stdlib=libc++ -Wl,-rpath=%s' % config.llvm_library_dir
   elif config.clang and config.stdlib == 'static-libc++':
-    link_cmd = '-stdlib=libc++ -lc++abi -static-libstdc++ -Wl,-rpath=%s' % config.llvm_library_dir
+    lib_cmd = '-stdlib=libc++ -lc++abi -static-libstdc++ -Wl,-rpath=%s' % (
+        config.llvm_library_dir)
+  elif any(x in config.target_triple for x in ('darwin', 'freebsd')):
+    lib_cmd = '-lc++'
   else:
-    link_cmd = '-lc++' if any(x in config.target_triple for x in ('darwin', 'freebsd')) else '-lstdc++'
+    lib_cmd = '-lstdc++'
+
   std_cmd = '--driver-mode=g++ -std=c++11' if is_cpp else ''
-  sanitizers = ['address']
+  sanitizers_cmd = ['address']
   if fuzzer_enabled:
-    sanitizers.append('fuzzer')
-  sanitizers_cmd = ('-fsanitize=%s' % ','.join(sanitizers))
-  isysroot_cmd = config.osx_sysroot_flag if config.osx_sysroot_flag else ''
-  include_cmd = '-I%s' % libfuzzer_src_root
-  return '%s %s %s -O2 -gline-tables-only %s %s %s' % (
-      compiler_cmd, std_cmd, link_cmd, isysroot_cmd, sanitizers_cmd, include_cmd)
+    sanitizers_cmd.append('fuzzer')
+  sanitizers_cmd = ('-fsanitize=%s' % ','.join(sanitizers_cmd))
+  if config.osx_sysroot_flag and not 'isysroot' in extra_cmd:
+    isysroot_cmd = config.osx_sysroot_flag
+  else:
+    isysroot_cmd = ''
+  return " ".join([
+    compiler_cmd,
+    std_cmd,
+    lib_cmd,
+    "-O2 -gline-tables-only",
+    isysroot_cmd,
+    sanitizers_cmd,
+    "-I%s" % libfuzzer_src_root,
+    "-I%s" % include_root,
+    extra_cmd
+  ])
 
 config.substitutions.append(('%cpp_compiler',
       generate_compiler_cmd(is_cpp=True, fuzzer_enabled=True)
@@ -82,3 +99,9 @@
 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: test/fuzzer/lit.site.cfg.in
===================================================================
--- test/fuzzer/lit.site.cfg.in
+++ test/fuzzer/lit.site.cfg.in
@@ -6,6 +6,9 @@
 config.target_flags = "@LIBFUZZER_TEST_FLAGS@"
 config.c_compiler = "@LIBFUZZER_TEST_COMPILER@"
 config.stdlib = "@LIBFUZZER_TEST_STDLIB@"
+config.ios = @LIBFUZZER_TEST_IOS_PYBOOL@
+config.target_cflags = "@LIBFUZZER_TEST_TARGET_CFLAGS@"
+config.name_suffix = "@LIBFUZZER_TEST_CONFIG_SUFFIX@"
 
 config.osx_sysroot_flag = "@OSX_SYSROOT_FLAG@"
 config.cmake_binary_dir = "@CMAKE_BINARY_DIR@"
Index: test/fuzzer/merge-posix.test
===================================================================
--- test/fuzzer/merge-posix.test
+++ test/fuzzer/merge-posix.test
@@ -1,3 +1,4 @@
+XFAIL: ios
 RUN: %cpp_compiler %S/FullCoverageSetTest.cpp -o %t-FullCoverageSetTest
 
 RUN: rm -rf  %tmp/T1 %tmp/T2
Index: test/fuzzer/merge-sigusr.test
===================================================================
--- test/fuzzer/merge-sigusr.test
+++ test/fuzzer/merge-sigusr.test
@@ -1,4 +1,5 @@
 # Check that libFuzzer honors SIGUSR1/SIGUSR2
+XFAIL: ios
 RUN: rm -rf %t
 RUN: mkdir -p %t
 RUN: %cpp_compiler %S/SleepOneSecondTest.cpp -o %t/LFSIGUSR
Index: test/fuzzer/merge.test
===================================================================
--- test/fuzzer/merge.test
+++ test/fuzzer/merge.test
@@ -1,3 +1,4 @@
+XFAIL: ios
 CHECK: BINGO
 
 RUN: %cpp_compiler %S/FullCoverageSetTest.cpp -o %t-FullCoverageSetTest
Index: test/fuzzer/minimize_crash.test
===================================================================
--- test/fuzzer/minimize_crash.test
+++ test/fuzzer/minimize_crash.test
@@ -1,16 +1,17 @@
 RUN: %cpp_compiler %S/NullDerefTest.cpp -o %t-NullDerefTest
 RUN: %cpp_compiler %S/SingleByteInputTest.cpp -o %t-SingleByteInputTest
+RUN: mkdir -p %t.dir
 
-RUN: echo 'Hi!rv349f34t3gg' > not_minimal_crash
-RUN: %run %t-NullDerefTest -minimize_crash=1 not_minimal_crash -max_total_time=2 2>&1 | FileCheck %s
-CHECK: CRASH_MIN: failed to minimize beyond ./minimized-from-{{.*}} (3 bytes), exiting
-RUN: %run %t-NullDerefTest -minimize_crash=1 not_minimal_crash -max_total_time=2 -exact_artifact_path=exact_minimized_path 2>&1 | FileCheck %s --check-prefix=CHECK_EXACT
-CHECK_EXACT: CRASH_MIN: failed to minimize beyond exact_minimized_path (3 bytes), exiting
-RUN: rm not_minimal_crash minimized-from-* exact_minimized_path
+RUN: echo 'Hi!rv349f34t3gg' > %t.dir/not_minimal_crash
+RUN: %run %t-NullDerefTest -minimize_crash=1 %t.dir/not_minimal_crash -max_total_time=2 2>&1 | FileCheck %s
+CHECK: CRASH_MIN: failed to minimize beyond {{.*}} (3 bytes), exiting
+RUN: %run %t-NullDerefTest -minimize_crash=1 %t.dir/not_minimal_crash -max_total_time=2 -exact_artifact_path=%t.exact_minimized_path 2>&1 | FileCheck %s --check-prefix=CHECK_EXACT
+CHECK_EXACT: CRASH_MIN: failed to minimize beyond {{.*}} (3 bytes), exiting
+RUN: rm %t.dir/not_minimal_crash %t.exact_minimized_path
 
-RUN: echo -n 'abcd*xyz' > not_minimal_crash
-RUN: %run %t-SingleByteInputTest -minimize_crash=1 not_minimal_crash -exact_artifact_path=exact_minimized_path 2>&1 | FileCheck %s --check-prefix=MIN1
-MIN1: Test unit written to exact_minimized_path
-MIN1: Test unit written to exact_minimized_path
+RUN: echo -n 'abcd*xyz' > %t.dir/not_minimal_crash
+RUN: %run %t-SingleByteInputTest -minimize_crash=1 %t.dir/not_minimal_crash -exact_artifact_path=%t.exact_minimized_path 2>&1 | FileCheck %s --check-prefix=MIN1
+MIN1: Test unit written to {{.*}}
+MIN1: Test unit written to {{.*}}
 MIN1: INFO: The input is small enough, exiting
-MIN1: CRASH_MIN: failed to minimize beyond exact_minimized_path (1 bytes), exiting
+MIN1: CRASH_MIN: failed to minimize beyond {{.*}} (1 bytes), exiting
Index: test/fuzzer/value-profile-div.test
===================================================================
--- test/fuzzer/value-profile-div.test
+++ test/fuzzer/value-profile-div.test
@@ -1,3 +1,4 @@
+XFAIL: ios
 CHECK: AddressSanitizer: {{FPE|int-divide-by-zero}}
 RUN: %cpp_compiler %S/DivTest.cpp -fsanitize-coverage=trace-div -o %t-DivTest
 RUN: not %run %t-DivTest -seed=1 -use_value_profile=1 -runs=10000000 2>&1 | FileCheck %s