diff --git a/build/crashpad.gypi b/build/crashpad.gypi
index 027c7b68..166e768f 100644
--- a/build/crashpad.gypi
+++ b/build/crashpad.gypi
@@ -25,5 +25,16 @@
       4201,  # nonstandard extension used : nameless struct/union.
       4324,  # structure was padded due to __declspec(align()).
     ],
+    'conditions': [
+      ['OS=="linux" or OS=="android"', {
+        'conditions': [
+          ['clang==0', {
+            'cflags': [
+              '-Wno-multichar',
+            ],
+          }],
+        ],
+      }],
+    ],
   },
 }
diff --git a/compat/non_win/winnt.h b/compat/non_win/winnt.h
index 82af0e6d..5e46f535 100644
--- a/compat/non_win/winnt.h
+++ b/compat/non_win/winnt.h
@@ -65,6 +65,8 @@
 #define PROCESSOR_ARCHITECTURE_AMD64 9
 #define PROCESSOR_ARCHITECTURE_IA32_ON_WIN64 10
 #define PROCESSOR_ARCHITECTURE_NEUTRAL 11
+#define PROCESSOR_ARCHITECTURE_ARM64 12
+#define PROCESSOR_ARCHITECTURE_ARM32_ON_WIN64 13
 #define PROCESSOR_ARCHITECTURE_UNKNOWN 0xffff
 //! \}
 
@@ -104,6 +106,10 @@
 #define PF_ARM_EXTERNAL_CACHE_AVAILABLE 26
 #define PF_ARM_FMAC_INSTRUCTIONS_AVAILABLE 27
 #define PF_RDRAND_INSTRUCTION_AVAILABLE 28
+#define PF_ARM_V8_INSTRUCTIONS_AVAILABLE 29
+#define PF_ARM_V8_CRYPTO_INSTRUCTIONS_AVAILABLE 30
+#define PF_ARM_V8_CRC32_INSTRUCTIONS_AVAILABLE 31
+#define PF_RDTSCP_INSTRUCTION_AVAILABLE 32
 //! \}
 
 //! \anchor IMAGE_DEBUG_MISC_x
diff --git a/compat/win/winnt.h b/compat/win/winnt.h
index 2c5ac662..6a5e0164 100644
--- a/compat/win/winnt.h
+++ b/compat/win/winnt.h
@@ -15,6 +15,9 @@
 #ifndef CRASHPAD_COMPAT_WIN_WINNT_H_
 #define CRASHPAD_COMPAT_WIN_WINNT_H_
 
+// include_next <winnt.h>
+#include <../um/winnt.h>
+
 // https://msdn.microsoft.com/en-us/library/windows/desktop/aa373184.aspx:
 // "Note that this structure definition was accidentally omitted from WinNT.h."
 struct PROCESSOR_POWER_INFORMATION {
@@ -26,7 +29,32 @@ struct PROCESSOR_POWER_INFORMATION {
   ULONG CurrentIdleState;
 };
 
-// include_next <winnt.h>
-#include <../um/winnt.h>
+// 10.0.10240.0 SDK
+
+#ifndef PROCESSOR_ARCHITECTURE_ARM64
+#define PROCESSOR_ARCHITECTURE_ARM64 12
+#endif
+
+#ifndef PF_ARM_V8_INSTRUCTIONS_AVAILABLE
+#define PF_ARM_V8_INSTRUCTIONS_AVAILABLE 29
+#endif
+
+#ifndef PF_ARM_V8_CRYPTO_INSTRUCTIONS_AVAILABLE
+#define PF_ARM_V8_CRYPTO_INSTRUCTIONS_AVAILABLE 30
+#endif
+
+#ifndef PF_ARM_V8_CRC32_INSTRUCTIONS_AVAILABLE
+#define PF_ARM_V8_CRC32_INSTRUCTIONS_AVAILABLE 31
+#endif
+
+#ifndef PF_RDTSCP_INSTRUCTION_AVAILABLE
+#define PF_RDTSCP_INSTRUCTION_AVAILABLE 32
+#endif
+
+// 10.0.14393.0 SDK
+
+#ifndef PROCESSOR_ARCHITECTURE_ARM32_ON_WIN64
+#define PROCESSOR_ARCHITECTURE_ARM32_ON_WIN64 13
+#endif
 
 #endif  // CRASHPAD_COMPAT_WIN_WINNT_H_
diff --git a/doc/developing.md b/doc/developing.md
index 229e7b00..9f881678 100644
--- a/doc/developing.md
+++ b/doc/developing.md
@@ -154,7 +154,12 @@ $ CC_target=~/android-ndk-r13_arm64_api21/bin/clang \
       --generator-output=out_android_arm64_api21 -f ninja-android
 ```
 
-Target “triplets” to use for `ar`, `nm`, and `readelf` are:
+It is also possible to use GCC instead of Clang by making the appropriate
+substitutions: `aarch64-linux-android-gcc` for `CC_target`;
+`aarch64-linux-android-g++` for `CXX_target`; and `-Dclang=0` as an argument to
+`gyp_crashpad.py`.
+
+Target “triplets” to use for `ar`, `nm`, `readelf`, `gcc`, and `g++` are:
 
 | Architecture | Target “triplet”        |
 |:-------------|:------------------------|
diff --git a/minidump/minidump_exception_writer.cc b/minidump/minidump_exception_writer.cc
index 5ec8d374..d2466a6b 100644
--- a/minidump/minidump_exception_writer.cc
+++ b/minidump/minidump_exception_writer.cc
@@ -21,6 +21,7 @@
 #include "minidump/minidump_context_writer.h"
 #include "snapshot/exception_snapshot.h"
 #include "util/file/file_writer.h"
+#include "util/misc/arraysize_unsafe.h"
 
 namespace crashpad {
 
@@ -64,7 +65,7 @@ void MinidumpExceptionWriter::SetExceptionInformation(
 
   const size_t parameters = exception_information.size();
   const size_t kMaxParameters =
-      arraysize(exception_.ExceptionRecord.ExceptionInformation);
+      ARRAYSIZE_UNSAFE(exception_.ExceptionRecord.ExceptionInformation);
   CHECK_LE(parameters, kMaxParameters);
 
   exception_.ExceptionRecord.NumberParameters =
diff --git a/minidump/minidump_extensions.h b/minidump/minidump_extensions.h
index 00ac6e88..245ef8b5 100644
--- a/minidump/minidump_extensions.h
+++ b/minidump/minidump_extensions.h
@@ -162,6 +162,16 @@ enum MinidumpCPUArchitecture : uint16_t {
   kMinidumpCPUArchitectureX86Win64 = PROCESSOR_ARCHITECTURE_IA32_ON_WIN64,
 
   kMinidumpCPUArchitectureNeutral = PROCESSOR_ARCHITECTURE_NEUTRAL,
+
+  //! \brief 64-bit ARM.
+  //!
+  //! These systems identify their CPUs generically as “arm64” or “aarch64”, or
+  //! with more specific names such as “armv8”.
+  //!
+  //! \sa #kMinidumpCPUArchitectureARM64Breakpad
+  kMinidumpCPUArchitectureARM64 = PROCESSOR_ARCHITECTURE_ARM64,
+
+  kMinidumpCPUArchitectureARM32Win64 = PROCESSOR_ARCHITECTURE_ARM32_ON_WIN64,
   kMinidumpCPUArchitectureSPARC = 0x8001,
 
   //! \brief 64-bit PowerPC.
@@ -170,11 +180,10 @@ enum MinidumpCPUArchitecture : uint16_t {
   //! specific names such as “ppc970”.
   kMinidumpCPUArchitecturePPC64 = 0x8002,
 
-  //! \brief 64-bit ARM.
+  //! \brief Used by Breakpad for 64-bit ARM.
   //!
-  //! These systems identify their CPUs generically as “arm64” or “aarch64”, or
-  //! with more specific names such as “armv8”.
-  kMinidumpCPUArchitectureARM64 = 0x8003,
+  //! \deprecated Use #kMinidumpCPUArchitectureARM64 instead.
+  kMinidumpCPUArchitectureARM64Breakpad = 0x8003,
 
   //! \brief Unknown CPU architecture.
   kMinidumpCPUArchitectureUnknown = PROCESSOR_ARCHITECTURE_UNKNOWN,
diff --git a/minidump/minidump_misc_info_writer.cc b/minidump/minidump_misc_info_writer.cc
index 5f88c50c..ff4fdda8 100644
--- a/minidump/minidump_misc_info_writer.cc
+++ b/minidump/minidump_misc_info_writer.cc
@@ -26,6 +26,7 @@
 #include "snapshot/process_snapshot.h"
 #include "snapshot/system_snapshot.h"
 #include "util/file/file_writer.h"
+#include "util/misc/arraysize_unsafe.h"
 #include "util/numeric/in_range_cast.h"
 #include "util/numeric/safe_assignment.h"
 
@@ -295,7 +296,7 @@ void MinidumpMiscInfoWriter::SetTimeZone(uint32_t time_zone_id,
 
   internal::MinidumpWriterUtil::AssignUTF8ToUTF16(
       misc_info_.TimeZone.StandardName,
-      arraysize(misc_info_.TimeZone.StandardName),
+      ARRAYSIZE_UNSAFE(misc_info_.TimeZone.StandardName),
       standard_name);
 
   misc_info_.TimeZone.StandardDate = standard_date;
@@ -303,7 +304,7 @@ void MinidumpMiscInfoWriter::SetTimeZone(uint32_t time_zone_id,
 
   internal::MinidumpWriterUtil::AssignUTF8ToUTF16(
       misc_info_.TimeZone.DaylightName,
-      arraysize(misc_info_.TimeZone.DaylightName),
+      ARRAYSIZE_UNSAFE(misc_info_.TimeZone.DaylightName),
       daylight_name);
 
   misc_info_.TimeZone.DaylightDate = daylight_date;
@@ -320,10 +321,12 @@ void MinidumpMiscInfoWriter::SetBuildString(
   misc_info_.Flags1 |= MINIDUMP_MISC4_BUILDSTRING;
 
   internal::MinidumpWriterUtil::AssignUTF8ToUTF16(
-      misc_info_.BuildString, arraysize(misc_info_.BuildString), build_string);
+      misc_info_.BuildString,
+      ARRAYSIZE_UNSAFE(misc_info_.BuildString),
+      build_string);
   internal::MinidumpWriterUtil::AssignUTF8ToUTF16(
       misc_info_.DbgBldStr,
-      arraysize(misc_info_.DbgBldStr),
+      ARRAYSIZE_UNSAFE(misc_info_.DbgBldStr),
       debug_build_string);
 }
 
diff --git a/minidump/minidump_simple_string_dictionary_writer.cc b/minidump/minidump_simple_string_dictionary_writer.cc
index 7a40cd4b..b4dd722e 100644
--- a/minidump/minidump_simple_string_dictionary_writer.cc
+++ b/minidump/minidump_simple_string_dictionary_writer.cc
@@ -34,8 +34,8 @@ MinidumpSimpleStringDictionaryEntryWriter::
 }
 
 const MinidumpSimpleStringDictionaryEntry*
-MinidumpSimpleStringDictionaryEntryWriter::MinidumpSimpleStringDictionaryEntry()
-    const {
+MinidumpSimpleStringDictionaryEntryWriter::
+    GetMinidumpSimpleStringDictionaryEntry() const {
   DCHECK_EQ(state(), kStateWritable);
 
   return &entry_;
@@ -179,7 +179,7 @@ bool MinidumpSimpleStringDictionaryWriter::WriteObject(
   std::vector<WritableIoVec> iovecs(1, iov);
 
   for (const auto& key_entry : entries_) {
-    iov.iov_base = key_entry.second->MinidumpSimpleStringDictionaryEntry();
+    iov.iov_base = key_entry.second->GetMinidumpSimpleStringDictionaryEntry();
     iov.iov_len = sizeof(MinidumpSimpleStringDictionaryEntry);
     iovecs.push_back(iov);
   }
diff --git a/minidump/minidump_simple_string_dictionary_writer.h b/minidump/minidump_simple_string_dictionary_writer.h
index 4e23717f..f2662bcc 100644
--- a/minidump/minidump_simple_string_dictionary_writer.h
+++ b/minidump/minidump_simple_string_dictionary_writer.h
@@ -52,7 +52,7 @@ class MinidumpSimpleStringDictionaryEntryWriter final
   //!
   //! \note Valid in #kStateWritable.
   const MinidumpSimpleStringDictionaryEntry*
-      MinidumpSimpleStringDictionaryEntry() const;
+  GetMinidumpSimpleStringDictionaryEntry() const;
 
   //! \brief Sets the strings to be written as the entry object’s key and value.
   //!
diff --git a/minidump/minidump_system_info_writer.cc b/minidump/minidump_system_info_writer.cc
index 066363cb..9c665f4f 100644
--- a/minidump/minidump_system_info_writer.cc
+++ b/minidump/minidump_system_info_writer.cc
@@ -20,6 +20,7 @@
 #include "minidump/minidump_string_writer.h"
 #include "snapshot/system_snapshot.h"
 #include "util/file/file_writer.h"
+#include "util/misc/arraysize_unsafe.h"
 #include "util/misc/implicit_cast.h"
 
 namespace crashpad {
@@ -64,10 +65,12 @@ uint64_t AMD64FeaturesFromSystemSnapshot(
   MAP_FEATURE(cpuid_features, F_RDRAND, PF_RDRAND_INSTRUCTION_AVAILABLE);
 
 #define FX_XD 20
+#define FX_RDTSCP 27
 #define FX_3DNOW 31
 
   uint64_t extended_features = system_snapshot->CPUX86ExtendedFeatures();
 
+  MAP_FEATURE(extended_features, FX_RDTSCP, PF_RDTSCP_INSTRUCTION_AVAILABLE);
   MAP_FEATURE(extended_features, FX_3DNOW, PF_3DNOW_INSTRUCTIONS_AVAILABLE);
 
 #define F7_FSGSBASE 0
@@ -76,8 +79,8 @@ uint64_t AMD64FeaturesFromSystemSnapshot(
 
   MAP_FEATURE(leaf7_features, F7_FSGSBASE, PF_RDWRFSGSBASE_AVAILABLE);
 
-  // This feature bit should be set if NX (XD, DEP) is enabled, not just if
-  // it’s available on the CPU as indicated by the XF_XD bit.
+  // This feature bit should be set if NX (XD, DEP) is enabled, not just if it’s
+  // available on the CPU as indicated by the FX_XD bit.
   if (system_snapshot->NXEnabled()) {
     minidump_features |= ADD_FEATURE(PF_NX_ENABLED);
   }
@@ -86,10 +89,10 @@ uint64_t AMD64FeaturesFromSystemSnapshot(
     minidump_features |= ADD_FEATURE(PF_SSE_DAZ_MODE_AVAILABLE);
   }
 
-  // PF_SECOND_LEVEL_ADDRESS_TRANSLATION can’t be determined without
-  // consulting model-specific registers, a privileged operation. The exact
-  // use of PF_VIRT_FIRMWARE_ENABLED is unknown. PF_FASTFAIL_AVAILABLE is
-  // irrelevant outside of Windows.
+  // PF_SECOND_LEVEL_ADDRESS_TRANSLATION can’t be determined without consulting
+  // model-specific registers, a privileged operation. The exact use of
+  // PF_VIRT_FIRMWARE_ENABLED is unknown. PF_FASTFAIL_AVAILABLE is irrelevant
+  // outside of Windows.
 
 #undef MAP_FEATURE
 #undef ADD_FEATURE
@@ -194,7 +197,7 @@ void MinidumpSystemInfoWriter::SetCPUX86Vendor(uint32_t ebx,
          system_info_.ProcessorArchitecture ==
              kMinidumpCPUArchitectureX86Win64);
 
-  static_assert(arraysize(system_info_.Cpu.X86CpuInfo.VendorId) == 3,
+  static_assert(ARRAYSIZE_UNSAFE(system_info_.Cpu.X86CpuInfo.VendorId) == 3,
                 "VendorId must have 3 elements");
 
   system_info_.Cpu.X86CpuInfo.VendorId[0] = ebx;
@@ -252,8 +255,9 @@ void MinidumpSystemInfoWriter::SetCPUOtherFeatures(uint64_t features_0,
          system_info_.ProcessorArchitecture !=
              kMinidumpCPUArchitectureX86Win64);
 
-  static_assert(arraysize(system_info_.Cpu.OtherCpuInfo.ProcessorFeatures) == 2,
-                "ProcessorFeatures must have 2 elements");
+  static_assert(
+      ARRAYSIZE_UNSAFE(system_info_.Cpu.OtherCpuInfo.ProcessorFeatures) == 2,
+      "ProcessorFeatures must have 2 elements");
 
   system_info_.Cpu.OtherCpuInfo.ProcessorFeatures[0] = features_0;
   system_info_.Cpu.OtherCpuInfo.ProcessorFeatures[1] = features_1;
diff --git a/minidump/minidump_system_info_writer_test.cc b/minidump/minidump_system_info_writer_test.cc
index 9976250a..2a869c6b 100644
--- a/minidump/minidump_system_info_writer_test.cc
+++ b/minidump/minidump_system_info_writer_test.cc
@@ -405,7 +405,8 @@ TEST(MinidumpSystemInfoWriter, InitializeFromSnapshot_AMD64) {
       (1 << PF_COMPARE_EXCHANGE128) |
       (1 << PF_XSAVE_ENABLED) |
       (1 << PF_RDWRFSGSBASE_AVAILABLE) |
-      (1 << PF_RDRAND_INSTRUCTION_AVAILABLE);
+      (1 << PF_RDRAND_INSTRUCTION_AVAILABLE) |
+      (UINT64_C(1) << PF_RDTSCP_INSTRUCTION_AVAILABLE);
   expect_system_info.Cpu.OtherCpuInfo.ProcessorFeatures[1] = 0;
   const char kOSVersionBuild[] = "13F34";
 
diff --git a/snapshot/win/process_snapshot_win_test.cc b/snapshot/win/process_snapshot_win_test.cc
index 76b5905b..a3e31a4e 100644
--- a/snapshot/win/process_snapshot_win_test.cc
+++ b/snapshot/win/process_snapshot_win_test.cc
@@ -31,7 +31,8 @@ namespace test {
 namespace {
 
 void TestImageReaderChild(const base::string16& directory_modification) {
-  UUID done_uuid(UUID::InitializeWithNewTag{});
+  UUID done_uuid;
+  done_uuid.InitializeWithNew();
   ScopedKernelHANDLE done(
       CreateEvent(nullptr, true, false, done_uuid.ToString16().c_str()));
   ASSERT_TRUE(done.get());
diff --git a/util/mach/mach_extensions.cc b/util/mach/mach_extensions.cc
index 64552f1c..eb4e330e 100644
--- a/util/mach/mach_extensions.cc
+++ b/util/mach/mach_extensions.cc
@@ -157,7 +157,26 @@ base::mac::ScopedMachReceiveRight BootstrapCheckIn(
 
 base::mac::ScopedMachSendRight BootstrapLookUp(
     const std::string& service_name) {
-  return BootstrapCheckInOrLookUp<BootstrapLookUpTraits>(service_name);
+  base::mac::ScopedMachSendRight send(
+      BootstrapCheckInOrLookUp<BootstrapLookUpTraits>(service_name));
+
+  // It’s possible to race the bootstrap server when the receive right
+  // corresponding to the looked-up send right is destroyed immediately before
+  // the bootstrap_look_up() call. If the bootstrap server believes that
+  // |service_name| is still registered before processing the port-destroyed
+  // notification sent to it by the kernel, it will respond to a
+  // bootstrap_look_up() request with a send right that has become a dead name,
+  // which will be returned to the bootstrap_look_up() caller, translated into
+  // the caller’s IPC port name space, as the special MACH_PORT_DEAD port name.
+  // Check for that and return MACH_PORT_NULL in its place, as though the
+  // bootstrap server had fully processed the port-destroyed notification before
+  // responding to bootstrap_look_up().
+  if (send.get() == MACH_PORT_DEAD) {
+    LOG(ERROR) << "bootstrap_look_up " << service_name << ": service is dead";
+    send.reset();
+  }
+
+  return send;
 }
 
 base::mac::ScopedMachSendRight SystemCrashReporterHandler() {
diff --git a/util/misc/arraysize_unsafe.h b/util/misc/arraysize_unsafe.h
new file mode 100644
index 00000000..e53c70b8
--- /dev/null
+++ b/util/misc/arraysize_unsafe.h
@@ -0,0 +1,27 @@
+// Copyright 2016 The Crashpad Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef CRASHPAD_UTIL_MISC_ARRAYSIZE_UNSAFE_H_
+#define CRASHPAD_UTIL_MISC_ARRAYSIZE_UNSAFE_H_
+
+//! \file
+
+//! \brief Not the safest way of computing an array’s size…
+//!
+//! `#%include "base/macros.h"` and use its `arraysize()` instead. This macro
+//! should only be used in rare situations where `arraysize()` does not
+//! function.
+#define ARRAYSIZE_UNSAFE(array) (sizeof(array) / sizeof(array[0]))
+
+#endif  // CRASHPAD_UTIL_MISC_ARRAYSIZE_UNSAFE_H_
diff --git a/util/misc/arraysize_unsafe_test.cc b/util/misc/arraysize_unsafe_test.cc
new file mode 100644
index 00000000..1c638e02
--- /dev/null
+++ b/util/misc/arraysize_unsafe_test.cc
@@ -0,0 +1,73 @@
+// Copyright 2016 The Crashpad Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "util/misc/arraysize_unsafe.h"
+
+#include "gtest/gtest.h"
+
+namespace crashpad {
+namespace test {
+namespace {
+
+TEST(ArraySizeUnsafe, ArraySizeUnsafe) {
+  char c0[0];
+  static_assert(ARRAYSIZE_UNSAFE(c0) == 0, "c0");
+
+  char c1[1];
+  static_assert(ARRAYSIZE_UNSAFE(c1) == 1, "c1");
+
+  char c2[2];
+  static_assert(ARRAYSIZE_UNSAFE(c2) == 2, "c2");
+
+  char c4[4];
+  static_assert(ARRAYSIZE_UNSAFE(c4) == 4, "c4");
+
+  int i0[0];
+  static_assert(ARRAYSIZE_UNSAFE(i0) == 0, "i0");
+
+  int i1[1];
+  static_assert(ARRAYSIZE_UNSAFE(i1) == 1, "i1");
+
+  int i2[2];
+  static_assert(ARRAYSIZE_UNSAFE(i2) == 2, "i2");
+
+  int i4[4];
+  static_assert(ARRAYSIZE_UNSAFE(i4) == 4, "i4");
+
+  long l8[8];
+  static_assert(ARRAYSIZE_UNSAFE(l8) == 8, "l8");
+
+  int l9[9];
+  static_assert(ARRAYSIZE_UNSAFE(l9) == 9, "l9");
+
+  struct S {
+    char c;
+    int i;
+    long l;
+    bool b;
+  };
+
+  S s0[0];
+  static_assert(ARRAYSIZE_UNSAFE(s0) == 0, "s0");
+
+  S s1[1];
+  static_assert(ARRAYSIZE_UNSAFE(s1) == 1, "s1");
+
+  S s10[10];
+  static_assert(ARRAYSIZE_UNSAFE(s10) == 10, "s10");
+}
+
+}  // namespace
+}  // namespace test
+}  // namespace crashpad
diff --git a/util/misc/uuid.cc b/util/misc/uuid.cc
index e4b4b31a..4f1fbcbe 100644
--- a/util/misc/uuid.cc
+++ b/util/misc/uuid.cc
@@ -42,23 +42,15 @@ namespace crashpad {
 static_assert(sizeof(UUID) == 16, "UUID must be 16 bytes");
 
 #if CXX_LIBRARY_VERSION >= 2011
-static_assert(std::is_standard_layout<UUID>::value,
-              "UUID must be standard layout");
+static_assert(std::is_pod<UUID>::value, "UUID must be POD");
 #endif
 
-UUID::UUID() : data_1(0), data_2(0), data_3(0), data_4(), data_5() {
-}
-
-UUID::UUID(InitializeWithNewTag) {
-  CHECK(InitializeWithNew());
-}
-
-UUID::UUID(const uint8_t* bytes) {
-  InitializeFromBytes(bytes);
-}
-
 bool UUID::operator==(const UUID& that) const {
-  return memcmp(this, &that, sizeof(UUID)) == 0;
+  return memcmp(this, &that, sizeof(*this)) == 0;
+}
+
+void UUID::InitializeToZero() {
+  memset(this, 0, sizeof(*this));
 }
 
 void UUID::InitializeFromBytes(const uint8_t* bytes) {
@@ -132,7 +124,7 @@ void UUID::InitializeFromSystemUUID(const ::UUID* system_uuid) {
                 "unexpected system uuid size");
   static_assert(offsetof(::UUID, Data1) == offsetof(UUID, data_1),
                 "unexpected system uuid layout");
-  memcpy(this, system_uuid, sizeof(::UUID));
+  memcpy(this, system_uuid, sizeof(*this));
 }
 #endif  // OS_WIN
 
diff --git a/util/misc/uuid.h b/util/misc/uuid.h
index f25aa652..4e5884e2 100644
--- a/util/misc/uuid.h
+++ b/util/misc/uuid.h
@@ -36,27 +36,14 @@ namespace crashpad {
 //!
 //! A %UUID is a unique 128-bit number specified by RFC 4122.
 //!
-//! This is a standard-layout structure.
+//! This is a POD structure.
 struct UUID {
-  //! \brief Initializes the %UUID to zero.
-  UUID();
-
-  //! \brief Tag to pass to constructor to indicate it should initialize with
-  //!     generated data.
-  struct InitializeWithNewTag {};
-
-  //! \brief Initializes the %UUID using a standard system facility to generate
-  //!     the value.
-  //!
-  //! CHECKs on failure with a message logged.
-  explicit UUID(InitializeWithNewTag);
-
-  //! \copydoc InitializeFromBytes()
-  explicit UUID(const uint8_t* bytes);
-
   bool operator==(const UUID& that) const;
   bool operator!=(const UUID& that) const { return !operator==(that); }
 
+  //! \brief Initializes the %UUID to zero.
+  void InitializeToZero();
+
   //! \brief Initializes the %UUID from a sequence of bytes.
   //!
   //! \a bytes is taken as a %UUID laid out in big-endian format in memory. On
diff --git a/util/misc/uuid_test.cc b/util/misc/uuid_test.cc
index 673cedc8..f064c653 100644
--- a/util/misc/uuid_test.cc
+++ b/util/misc/uuid_test.cc
@@ -31,6 +31,7 @@ namespace {
 
 TEST(UUID, UUID) {
   UUID uuid_zero;
+  uuid_zero.InitializeToZero();
   EXPECT_EQ(0u, uuid_zero.data_1);
   EXPECT_EQ(0u, uuid_zero.data_2);
   EXPECT_EQ(0u, uuid_zero.data_3);
@@ -60,7 +61,8 @@ TEST(UUID, UUID) {
                               0x0d,
                               0x0e,
                               0x0f};
-  UUID uuid(kBytes);
+  UUID uuid;
+  uuid.InitializeFromBytes(kBytes);
   EXPECT_EQ(0x00010203u, uuid.data_1);
   EXPECT_EQ(0x0405u, uuid.data_2);
   EXPECT_EQ(0x0607u, uuid.data_3);
@@ -78,7 +80,8 @@ TEST(UUID, UUID) {
   EXPECT_FALSE(uuid == uuid_zero);
   EXPECT_NE(uuid, uuid_zero);
 
-  UUID uuid_2(kBytes);
+  UUID uuid_2;
+  uuid_2.InitializeFromBytes(kBytes);
   EXPECT_EQ(uuid, uuid_2);
   EXPECT_FALSE(uuid != uuid_2);
 
@@ -155,7 +158,8 @@ TEST(UUID, UUID) {
   EXPECT_EQ(0x45u, uuid.data_5[5]);
   EXPECT_EQ("45454545-4545-4545-4545-454545454545", uuid.ToString());
 
-  UUID initialized_generated(UUID::InitializeWithNewTag{});
+  UUID initialized_generated;
+  initialized_generated.InitializeWithNew();
   EXPECT_NE(initialized_generated, uuid_zero);
 }
 
@@ -182,7 +186,9 @@ TEST(UUID, FromString) {
     {"6d247a34-53d5-40ec-a90d-d8dea9e94cc01", false}
   };
 
-  const std::string empty_uuid = UUID().ToString();
+  UUID uuid_zero;
+  uuid_zero.InitializeToZero();
+  const std::string empty_uuid = uuid_zero.ToString();
 
   for (size_t index = 0; index < arraysize(kCases); ++index) {
     const TestCase& test_case = kCases[index];
@@ -190,6 +196,7 @@ TEST(UUID, FromString) {
         "index %" PRIuS ": %s", index, test_case.uuid_string));
 
     UUID uuid;
+    uuid.InitializeToZero();
     EXPECT_EQ(test_case.success,
               uuid.InitializeFromString(test_case.uuid_string));
     if (test_case.success) {
diff --git a/util/util.gyp b/util/util.gyp
index 8269bd42..5768788a 100644
--- a/util/util.gyp
+++ b/util/util.gyp
@@ -84,6 +84,7 @@
         'mach/task_for_pid.h',
         'mach/task_memory.cc',
         'mach/task_memory.h',
+        'misc/arraysize_unsafe.h',
         'misc/clock.h',
         'misc/clock_mac.cc',
         'misc/clock_posix.cc',
diff --git a/util/util_test.gyp b/util/util_test.gyp
index 9efe162a..b5989de9 100644
--- a/util/util_test.gyp
+++ b/util/util_test.gyp
@@ -55,6 +55,7 @@
         'mach/scoped_task_suspend_test.cc',
         'mach/symbolic_constants_mach_test.cc',
         'mach/task_memory_test.cc',
+        'misc/arraysize_unsafe_test.cc',
         'misc/clock_test.cc',
         'misc/initialization_state_dcheck_test.cc',
         'misc/initialization_state_test.cc',
diff --git a/util/win/process_info_test.cc b/util/win/process_info_test.cc
index be2cfed0..e377a6ee 100644
--- a/util/win/process_info_test.cc
+++ b/util/win/process_info_test.cc
@@ -132,7 +132,8 @@ TEST(ProcessInfo, Self) {
 void TestOtherProcess(const base::string16& directory_modification) {
   ProcessInfo process_info;
 
-  UUID done_uuid(UUID::InitializeWithNewTag{});
+  UUID done_uuid;
+  done_uuid.InitializeWithNew();
 
   ScopedKernelHANDLE done(
       CreateEvent(nullptr, true, false, done_uuid.ToString16().c_str()));