diff --git a/build/Android.common.mk b/build/Android.common.mk
index 704da68..28546e9 100644
--- a/build/Android.common.mk
+++ b/build/Android.common.mk
@@ -91,10 +91,12 @@
 # Don't fail a dalvik minimal host build.
 -include $(LLVM_ROOT_PATH)/llvm.mk
 
-# Clang build.
-# ART_TARGET_CLANG := true
+# Clang build support.
+ART_TARGET_CLANG := false
 ifeq ($(HOST_OS),darwin)
-ART_HOST_CLANG := true
+  ART_HOST_CLANG := true
+else
+  ART_HOST_CLANG := false
 endif
 
 # directory used for dalvik-cache on device
diff --git a/build/Android.gtest.mk b/build/Android.gtest.mk
index 2ddd09e..0b0c445 100644
--- a/build/Android.gtest.mk
+++ b/build/Android.gtest.mk
@@ -155,7 +155,6 @@
     LOCAL_SHARED_LIBRARIES += libdl libicuuc libicui18n libnativehelper libz libcutils
     LOCAL_STATIC_LIBRARIES += libgtest
     LOCAL_MODULE_PATH := $(ART_NATIVETEST_OUT)
-    include $(LLVM_DEVICE_BUILD_MK)
     include $(BUILD_EXECUTABLE)
     art_gtest_exe := $$(LOCAL_MODULE_PATH)/$$(LOCAL_MODULE)
     ART_TARGET_GTEST_EXECUTABLES += $$(art_gtest_exe)
@@ -168,7 +167,6 @@
       # Mac OS complains about unresolved symbols if you don't include this.
       LOCAL_WHOLE_STATIC_LIBRARIES := libgtest_host
     endif
-    include $(LLVM_HOST_BUILD_MK)
     include $(BUILD_HOST_EXECUTABLE)
     art_gtest_exe := $(HOST_OUT_EXECUTABLES)/$$(LOCAL_MODULE)
     ART_HOST_GTEST_EXECUTABLES += $$(art_gtest_exe)
diff --git a/compiler/Android.mk b/compiler/Android.mk
index 8f840cc..b1b6fc5 100644
--- a/compiler/Android.mk
+++ b/compiler/Android.mk
@@ -106,7 +106,7 @@
 LIBART_COMPILER_CFLAGS :=
 
 ifeq ($(ART_USE_PORTABLE_COMPILER),true)
-LIBART_COMPILER_SRC_FILES +=
+LIBART_COMPILER_SRC_FILES += \
 	dex/portable/mir_to_gbc.cc \
 	elf_writer_mclinker.cc \
 	jni/portable/jni_compiler.cc \
@@ -120,11 +120,12 @@
 	llvm/runtime_support_builder.cc \
 	llvm/runtime_support_builder_arm.cc \
 	llvm/runtime_support_builder_x86.cc
-  LIBART_COMPILER_CFLAGS += -DART_USE_PORTABLE_COMPILER=1
+LIBART_COMPILER_CFLAGS += -DART_USE_PORTABLE_COMPILER=1
 endif
 
 LIBART_COMPILER_ENUM_OPERATOR_OUT_HEADER_FILES := \
-	dex/compiler_enums.h
+	dex/compiler_enums.h \
+	dex/quick/dex_file_method_inliner.h
 
 # $(1): target or host
 # $(2): ndebug or debug
@@ -211,12 +212,15 @@
       ifeq ($(TARGET_ARCH),arm64)
          $$(info TODOAArch64: $$(LOCAL_PATH)/Android.mk Add Arm64 specific MCLinker libraries)
       endif # TARGET_ARCH != arm64
+      include $(LLVM_DEVICE_BUILD_MK)
     else # host
       LOCAL_STATIC_LIBRARIES += libmcldARMInfo libmcldARMTarget
       LOCAL_STATIC_LIBRARIES += libmcldX86Info libmcldX86Target
       LOCAL_STATIC_LIBRARIES += libmcldMipsInfo libmcldMipsTarget
+      include $(LLVM_HOST_BUILD_MK)
     endif
     LOCAL_STATIC_LIBRARIES += libmcldCore libmcldObject libmcldADT libmcldFragment libmcldTarget libmcldCodeGen libmcldLDVariant libmcldMC libmcldSupport libmcldLD
+    include $(LLVM_GEN_INTRINSICS_MK)
   endif
 
   LOCAL_C_INCLUDES += $(ART_C_INCLUDES) art/runtime
@@ -228,13 +232,9 @@
   LOCAL_ADDITIONAL_DEPENDENCIES += $(LOCAL_PATH)/Android.mk
   ifeq ($$(art_target_or_host),target)
     LOCAL_SHARED_LIBRARIES += libcutils
-    include $(LLVM_GEN_INTRINSICS_MK)
-    include $(LLVM_DEVICE_BUILD_MK)
     include $(BUILD_SHARED_LIBRARY)
   else # host
     LOCAL_STATIC_LIBRARIES += libcutils
-    include $(LLVM_GEN_INTRINSICS_MK)
-    include $(LLVM_HOST_BUILD_MK)
     include $(BUILD_HOST_SHARED_LIBRARY)
   endif
 
diff --git a/compiler/common_compiler_test.h b/compiler/common_compiler_test.h
index 0999d09..9bcc040 100644
--- a/compiler/common_compiler_test.h
+++ b/compiler/common_compiler_test.h
@@ -240,7 +240,7 @@
 #if GCC_VERSION >= 40303
     __builtin___clear_cache(reinterpret_cast<void*>(base), reinterpret_cast<void*>(base + len));
 #else
-    LOG(FATAL) << "UNIMPLEMENTED: cache flush";
+    LOG(WARNING) << "UNIMPLEMENTED: cache flush";
 #endif
   }
 
diff --git a/compiler/compiler_backend.h b/compiler/compiler_backend.h
index 01a69af..2d68b21 100644
--- a/compiler/compiler_backend.h
+++ b/compiler/compiler_backend.h
@@ -23,7 +23,7 @@
 namespace art {
 
 class Backend;
-class CompilationUnit;
+struct CompilationUnit;
 class CompilerDriver;
 class CompiledMethod;
 class MIRGraph;
diff --git a/compiler/dex/frontend.h b/compiler/dex/frontend.h
index 8ce1206..22a7b8c 100644
--- a/compiler/dex/frontend.h
+++ b/compiler/dex/frontend.h
@@ -105,7 +105,7 @@
     UniquePtr<art::llvm::IRBuilder> ir_builder_;
 };
 
-struct CompiledMethod;
+class CompiledMethod;
 class CompilerDriver;
 
 }  // namespace art
diff --git a/compiler/dex/pass.h b/compiler/dex/pass.h
index 255892e..9457d5b 100644
--- a/compiler/dex/pass.h
+++ b/compiler/dex/pass.h
@@ -22,8 +22,8 @@
 namespace art {
 
 // Forward declarations.
-class BasicBlock;
-class CompilationUnit;
+struct BasicBlock;
+struct CompilationUnit;
 class Pass;
 
 /**
diff --git a/compiler/dex/portable/mir_to_gbc.cc b/compiler/dex/portable/mir_to_gbc.cc
index 3187fbb..70438ec 100644
--- a/compiler/dex/portable/mir_to_gbc.cc
+++ b/compiler/dex/portable/mir_to_gbc.cc
@@ -30,6 +30,7 @@
 #include "dex/compiler_internals.h"
 #include "dex/dataflow_iterator-inl.h"
 #include "dex/frontend.h"
+#include "llvm/ir_builder.h"
 #include "llvm/llvm_compilation_unit.h"
 #include "llvm/utils_llvm.h"
 #include "mir_to_gbc.h"
diff --git a/compiler/dex/portable/mir_to_gbc.h b/compiler/dex/portable/mir_to_gbc.h
index 2b681f6..e97634c 100644
--- a/compiler/dex/portable/mir_to_gbc.h
+++ b/compiler/dex/portable/mir_to_gbc.h
@@ -17,11 +17,18 @@
 #ifndef ART_COMPILER_DEX_PORTABLE_MIR_TO_GBC_H_
 #define ART_COMPILER_DEX_PORTABLE_MIR_TO_GBC_H_
 
+#include <llvm/ADT/ArrayRef.h>
+#include <llvm/IR/BasicBlock.h>
+#include <llvm/IR/IRBuilder.h>
+#include <llvm/IR/LLVMContext.h>
+#include <llvm/IR/Module.h>
+
 #include "invoke_type.h"
 #include "compiled_method.h"
 #include "dex/compiler_enums.h"
 #include "dex/compiler_ir.h"
 #include "dex/backend.h"
+#include "llvm/intrinsic_helper.h"
 #include "llvm/llvm_compilation_unit.h"
 #include "safe_map.h"
 
diff --git a/compiler/dex/quick/dex_file_method_inliner.h b/compiler/dex/quick/dex_file_method_inliner.h
index 3dcb964..b4d8dd6 100644
--- a/compiler/dex/quick/dex_file_method_inliner.h
+++ b/compiler/dex/quick/dex_file_method_inliner.h
@@ -31,7 +31,7 @@
 class MethodVerifier;
 }  // namespace verifier
 
-class CallInfo;
+struct CallInfo;
 class Mir2Lir;
 
 enum InlineMethodOpcode : uint16_t {
@@ -61,6 +61,7 @@
   kInlineOpIGet,
   kInlineOpIPut,
 };
+std::ostream& operator<<(std::ostream& os, const InlineMethodOpcode& rhs);
 
 enum InlineMethodFlags : uint16_t {
   kNoInlineMethodFlags = 0x0000,
@@ -78,13 +79,13 @@
 
   // kIntrinsicIsEmptyOrLength
   kIntrinsicFlagLength  = kIntrinsicFlagNone,
-  kIntrinsicFlagIsEmpty = 1,
+  kIntrinsicFlagIsEmpty = kIntrinsicFlagMin,
 
   // kIntrinsicIndexOf
-  kIntrinsicFlagBase0 = 1,
+  kIntrinsicFlagBase0 = kIntrinsicFlagMin,
 
   // kIntrinsicUnsafeGet, kIntrinsicUnsafePut, kIntrinsicUnsafeCas
-  kIntrinsicFlagIsLong     = 1,
+  kIntrinsicFlagIsLong     = kIntrinsicFlagMin,
   // kIntrinsicUnsafeGet, kIntrinsicUnsafePut
   kIntrinsicFlagIsVolatile = 2,
   // kIntrinsicUnsafePut, kIntrinsicUnsafeCas
@@ -187,7 +188,6 @@
      */
     bool GenSpecial(Mir2Lir* backend, uint32_t method_idx);
 
-  private:
     /**
      * To avoid multiple lookups of a class by its descriptor, we cache its
      * type index in the IndexCache. These are the indexes into the IndexCache
@@ -311,6 +311,7 @@
       kProtoCacheLast
     };
 
+  private:
     /**
      * The maximum number of method parameters we support in the ProtoDef.
      */
diff --git a/compiler/driver/compiler_driver.h b/compiler/driver/compiler_driver.h
index 377eb6f..1bd2c1b 100644
--- a/compiler/driver/compiler_driver.h
+++ b/compiler/driver/compiler_driver.h
@@ -48,7 +48,7 @@
 class CompilerOptions;
 class DexCompilationUnit;
 class DexFileToMethodInlinerMap;
-class InlineIGetIPutData;
+struct InlineIGetIPutData;
 class OatWriter;
 class ParallelCompilationManager;
 class TimingLogger;
diff --git a/compiler/utils/arena_bit_vector.cc b/compiler/utils/arena_bit_vector.cc
index 6f03524..220ff14 100644
--- a/compiler/utils/arena_bit_vector.cc
+++ b/compiler/utils/arena_bit_vector.cc
@@ -42,6 +42,8 @@
 
 ArenaBitVector::ArenaBitVector(ArenaAllocator* arena, unsigned int start_bits,
                                bool expandable, OatBitMapKind kind)
-  :  BitVector(start_bits, expandable, new (arena) ArenaBitVectorAllocator(arena)), kind_(kind) {}
+  :  BitVector(start_bits, expandable, new (arena) ArenaBitVectorAllocator(arena)), kind_(kind) {
+  UNUSED(kind_);
+}
 
 }  // namespace art
diff --git a/compiler/utils/arm/managed_register_arm.cc b/compiler/utils/arm/managed_register_arm.cc
index 57c2305..1fdc110 100644
--- a/compiler/utils/arm/managed_register_arm.cc
+++ b/compiler/utils/arm/managed_register_arm.cc
@@ -21,16 +21,6 @@
 namespace art {
 namespace arm {
 
-// We need all registers for caching of locals.
-// Register R9 .. R15 are reserved.
-static const int kNumberOfAvailableCoreRegisters = (R8 - R0) + 1;
-static const int kNumberOfAvailableSRegisters = kNumberOfSRegisters;
-static const int kNumberOfAvailableDRegisters = kNumberOfDRegisters;
-static const int kNumberOfAvailableOverlappingDRegisters =
-    kNumberOfOverlappingDRegisters;
-static const int kNumberOfAvailableRegisterPairs = kNumberOfRegisterPairs;
-
-
 // Returns true if this managed-register overlaps the other managed-register.
 bool ArmManagedRegister::Overlaps(const ArmManagedRegister& other) const {
   if (IsNoRegister() || other.IsNoRegister()) return false;
diff --git a/compiler/utils/assembler.h b/compiler/utils/assembler.h
index c9be4ed..296254d 100644
--- a/compiler/utils/assembler.h
+++ b/compiler/utils/assembler.h
@@ -282,7 +282,9 @@
   byte* cursor_;
   byte* limit_;
   AssemblerFixup* fixup_;
+#ifndef NDEBUG
   bool fixups_processed_;
+#endif
 
   // Head of linked list of slow paths
   SlowPath* slow_path_;
diff --git a/compiler/utils/mips/managed_register_mips.cc b/compiler/utils/mips/managed_register_mips.cc
index 195dafb..5a8c048 100644
--- a/compiler/utils/mips/managed_register_mips.cc
+++ b/compiler/utils/mips/managed_register_mips.cc
@@ -21,17 +21,6 @@
 namespace art {
 namespace mips {
 
-// These core registers are never available for allocation.
-static const Register kReservedCoreRegistersArray[] = { S0, S1 };
-
-// We need all registers for caching.
-static const int kNumberOfAvailableCoreRegisters = (S7 - T0) + 1;
-static const int kNumberOfAvailableFRegisters = kNumberOfFRegisters;
-static const int kNumberOfAvailableDRegisters = kNumberOfDRegisters;
-static const int kNumberOfAvailableOverlappingDRegisters =
-    kNumberOfOverlappingDRegisters;
-static const int kNumberOfAvailableRegisterPairs = kNumberOfRegisterPairs;
-
 bool MipsManagedRegister::Overlaps(const MipsManagedRegister& other) const {
   if (IsNoRegister() || other.IsNoRegister()) return false;
   CHECK(IsValidManagedRegister());
diff --git a/compiler/utils/x86/managed_register_x86.cc b/compiler/utils/x86/managed_register_x86.cc
index 4697d06..7fae7a8 100644
--- a/compiler/utils/x86/managed_register_x86.cc
+++ b/compiler/utils/x86/managed_register_x86.cc
@@ -21,19 +21,6 @@
 namespace art {
 namespace x86 {
 
-// These cpu registers are never available for allocation.
-static const Register kReservedCpuRegistersArray[] = { ESP };
-
-
-// We reduce the number of available registers for allocation in debug-code
-// mode in order to increase register pressure.
-
-// We need all registers for caching.
-static const int kNumberOfAvailableCpuRegisters = kNumberOfCpuRegisters;
-static const int kNumberOfAvailableXmmRegisters = kNumberOfXmmRegisters;
-static const int kNumberOfAvailableRegisterPairs = kNumberOfRegisterPairs;
-
-
 // Define register pairs.
 // This list must be kept in sync with the RegisterPair enum.
 #define REGISTER_PAIR_LIST(P) \
diff --git a/disassembler/Android.mk b/disassembler/Android.mk
index 1ce7b13..ca08b09 100644
--- a/disassembler/Android.mk
+++ b/disassembler/Android.mk
@@ -90,13 +90,9 @@
   LOCAL_ADDITIONAL_DEPENDENCIES += $(LOCAL_PATH)/Android.mk
   ifeq ($$(art_target_or_host),target)
     LOCAL_SHARED_LIBRARIES += libcutils
-    include $(LLVM_GEN_INTRINSICS_MK)
-    include $(LLVM_DEVICE_BUILD_MK)
     include $(BUILD_SHARED_LIBRARY)
   else # host
     LOCAL_STATIC_LIBRARIES += libcutils
-    include $(LLVM_GEN_INTRINSICS_MK)
-    include $(LLVM_HOST_BUILD_MK)
     include $(BUILD_HOST_SHARED_LIBRARY)
   endif
 endef
diff --git a/runtime/Android.mk b/runtime/Android.mk
index d6d2b42..10ef64b 100644
--- a/runtime/Android.mk
+++ b/runtime/Android.mk
@@ -74,7 +74,6 @@
 	intern_table.cc \
 	interpreter/interpreter.cc \
 	interpreter/interpreter_common.cc \
-	interpreter/interpreter_goto_table_impl.cc \
 	interpreter/interpreter_switch_impl.cc \
 	jdwp/jdwp_event.cc \
 	jdwp/jdwp_expand_buf.cc \
@@ -185,6 +184,10 @@
 	entrypoints/quick/quick_throw_entrypoints.cc \
 	entrypoints/quick/quick_trampoline_entrypoints.cc
 
+# Source files that only compile with GCC.
+LIBART_GCC_ONLY_SRC_FILES := \
+	interpreter/interpreter_goto_table_impl.cc
+
 LIBART_LDFLAGS := -Wl,--no-fatal-warnings
 
 LIBART_TARGET_SRC_FILES := \
@@ -300,6 +303,7 @@
 
 # $(1): target or host
 # $(2): ndebug or debug
+# 3(3): true or false for LOCAL_CLANG
 define build-libart
   ifneq ($(1),target)
     ifneq ($(1),host)
@@ -311,9 +315,15 @@
       $$(error expected ndebug or debug for argument 2, received $(2))
     endif
   endif
+  ifneq ($(3),true)
+    ifneq ($(3),false)
+      $$(error expected true or false for argument 3, received $(3))
+    endif
+  endif
 
   art_target_or_host := $(1)
   art_ndebug_or_debug := $(2)
+  art_clang := $(3)
 
   include $(CLEAR_VARS)
   ifeq ($$(art_target_or_host),target)
@@ -354,11 +364,14 @@
   $(foreach arch,$(ART_SUPPORTED_ARCH),
     LOCAL_LDFLAGS_$(arch) := $$(LIBART_TARGET_LDFLAGS_$(arch)))
 
+  ifeq ($$(art_clang),false)
+    LOCAL_SRC_FILES += $(LIBART_GCC_ONLY_SRC_FILES)
+  else
+    LOCAL_CLANG := true
+  endif
   ifeq ($$(art_target_or_host),target)
-    LOCAL_CLANG := $(ART_TARGET_CLANG)
     LOCAL_CFLAGS += $(ART_TARGET_CFLAGS)
   else # host
-    LOCAL_CLANG := $(ART_HOST_CLANG)
     LOCAL_CFLAGS += $(ART_HOST_CFLAGS)
   endif
   ifeq ($$(art_ndebug_or_debug),debug)
@@ -389,7 +402,14 @@
       LOCAL_LDLIBS += -lrt
     endif
   endif
-  include $(LLVM_GEN_INTRINSICS_MK)
+  ifeq ($(ART_USE_PORTABLE_COMPILER),true)
+    include $(LLVM_GEN_INTRINSICS_MK)
+    ifeq ($$(art_target_or_host),target)
+      include $(LLVM_DEVICE_BUILD_MK)
+    else # host
+      include $(LLVM_HOST_BUILD_MK)
+    endif
+  endif
   LOCAL_ADDITIONAL_DEPENDENCIES := art/build/Android.common.mk
   LOCAL_ADDITIONAL_DEPENDENCIES += $(LOCAL_PATH)/Android.mk
 
@@ -398,27 +418,25 @@
   endif
 
   ifeq ($$(art_target_or_host),target)
-    include $(LLVM_DEVICE_BUILD_MK)
     include $(BUILD_SHARED_LIBRARY)
   else # host
-    include $(LLVM_HOST_BUILD_MK)
     include $(BUILD_HOST_SHARED_LIBRARY)
   endif
 endef
 
 ifeq ($(ART_BUILD_TARGET_NDEBUG),true)
-  $(eval $(call build-libart,target,ndebug))
+  $(eval $(call build-libart,target,ndebug,$(ART_TARGET_CLANG)))
 endif
 ifeq ($(ART_BUILD_TARGET_DEBUG),true)
-  $(eval $(call build-libart,target,debug))
+  $(eval $(call build-libart,target,debug,$(ART_TARGET_CLANG)))
 endif
 
 # We always build dex2oat and dependencies, even if the host build is otherwise disabled, since they are used to cross compile for the target.
 ifeq ($(WITH_HOST_DALVIK),true)
   ifeq ($(ART_BUILD_NDEBUG),true)
-    $(eval $(call build-libart,host,ndebug))
+    $(eval $(call build-libart,host,ndebug,$(ART_HOST_CLANG)))
   endif
   ifeq ($(ART_BUILD_DEBUG),true)
-    $(eval $(call build-libart,host,debug))
+    $(eval $(call build-libart,host,debug,$(ART_HOST_CLANG)))
   endif
 endif
diff --git a/runtime/arch/x86/asm_support_x86.S b/runtime/arch/x86/asm_support_x86.S
index 9ec1995..267717a 100644
--- a/runtime/arch/x86/asm_support_x86.S
+++ b/runtime/arch/x86/asm_support_x86.S
@@ -19,38 +19,25 @@
 
 #include "asm_support_x86.h"
 
-#if defined(__APPLE__)
-    // Mac OS' as(1) doesn't let you name macro parameters.
+#if defined(__clang__)
+    // Clang's as(1) doesn't let you name macro parameters.
     #define MACRO0(macro_name) .macro macro_name
     #define MACRO1(macro_name, macro_arg1) .macro macro_name
     #define MACRO2(macro_name, macro_arg1, macro_args2) .macro macro_name
     #define MACRO3(macro_name, macro_arg1, macro_args2, macro_args3) .macro macro_name
     #define END_MACRO .endmacro
 
-    // Mac OS' as(1) uses $0, $1, and so on for macro arguments, and function names
-    // are mangled with an extra underscore prefix. The use of $x for arguments
-    // mean that literals need to be represented with $$x in macros.
-    #define SYMBOL(name) _ ## name
-    #define PLT_SYMBOL(name) _ ## name
+    // Clang's as(1) uses $0, $1, and so on for macro arguments.
     #define VAR(name,index) SYMBOL($index)
     #define PLT_VAR(name, index) SYMBOL($index)
     #define REG_VAR(name,index) %$index
     #define CALL_MACRO(name,index) $index
+    #define FUNCTION_TYPE(name,index) .type $index, @function
+    #define SIZE(name,index) .size $index, .-$index
+
+    //  The use of $x for arguments mean that literals need to be represented with $$x in macros.
     #define LITERAL(value) $value
     #define MACRO_LITERAL(value) $$value
-
-    // Mac OS' doesn't like cfi_* directives
-    #define CFI_STARTPROC
-    #define CFI_ENDPROC
-    #define CFI_ADJUST_CFA_OFFSET(size)
-    #define CFI_DEF_CFA(reg,size)
-    #define CFI_DEF_CFA_REGISTER(reg)
-    #define CFI_RESTORE(reg)
-    #define CFI_REL_OFFSET(reg,size)
-
-    // Mac OS' doesn't support certain directives
-    #define FUNCTION_TYPE(name)
-    #define SIZE(name)
 #else
     // Regular gas(1) lets you name macro parameters.
     #define MACRO0(macro_name) .macro macro_name
@@ -65,16 +52,19 @@
     // no special meaning to $, so literals are still just $x. The use of altmacro means % is a
     // special character meaning care needs to be taken when passing registers as macro arguments.
     .altmacro
-    #define SYMBOL(name) name
-    #define PLT_SYMBOL(name) name@PLT
     #define VAR(name,index) name&
     #define PLT_VAR(name, index) name&@PLT
     #define REG_VAR(name,index) %name
     #define CALL_MACRO(name,index) name&
+    #define FUNCTION_TYPE(name,index) .type name&, @function
+    #define SIZE(name,index) .size name, .-name
+
     #define LITERAL(value) $value
     #define MACRO_LITERAL(value) $value
+#endif
 
-    // CFI support
+    // CFI support.
+#if !defined(__APPLE__)
     #define CFI_STARTPROC .cfi_startproc
     #define CFI_ENDPROC .cfi_endproc
     #define CFI_ADJUST_CFA_OFFSET(size) .cfi_adjust_cfa_offset size
@@ -82,9 +72,25 @@
     #define CFI_DEF_CFA_REGISTER(reg) .cfi_def_cfa_register reg
     #define CFI_RESTORE(reg) .cfi_restore reg
     #define CFI_REL_OFFSET(reg,size) .cfi_rel_offset reg,size
+#else
+    // Mac OS' doesn't like cfi_* directives.
+    #define CFI_STARTPROC
+    #define CFI_ENDPROC
+    #define CFI_ADJUST_CFA_OFFSET(size)
+    #define CFI_DEF_CFA(reg,size)
+    #define CFI_DEF_CFA_REGISTER(reg)
+    #define CFI_RESTORE(reg)
+    #define CFI_REL_OFFSET(reg,size)
+#endif
 
-    #define FUNCTION_TYPE(name) .type name&, @function
-    #define SIZE(name) .size name, .-name
+    // Symbols.
+#if !defined(__APPLE__)
+    #define SYMBOL(name) name
+    #define PLT_SYMBOL(name) name
+#else
+    // Mac OS' symbols have an _ prefix.
+    #define SYMBOL(name) _ ## name
+    #define PLT_SYMBOL(name) _ ## name
 #endif
 
     /* Cache alignment for function entry */
@@ -93,7 +99,7 @@
 END_MACRO
 
 MACRO1(DEFINE_FUNCTION, c_name)
-    FUNCTION_TYPE(\c_name)
+    FUNCTION_TYPE(\c_name, 0)
     .globl VAR(c_name, 0)
     ALIGN_FUNCTION_ENTRY
 VAR(c_name, 0):
@@ -102,7 +108,7 @@
 
 MACRO1(END_FUNCTION, c_name)
     CFI_ENDPROC
-    SIZE(\c_name)
+    SIZE(\c_name, 0)
 END_MACRO
 
 MACRO1(PUSH, reg)
@@ -118,7 +124,7 @@
 END_MACRO
 
 MACRO1(UNIMPLEMENTED,name)
-    FUNCTION_TYPE(\name)
+    FUNCTION_TYPE(\name, 0)
     .globl VAR(name, 0)
     ALIGN_FUNCTION_ENTRY
 VAR(name, 0):
@@ -126,7 +132,7 @@
     int3
     int3
     CFI_ENDPROC
-    SIZE(\name)
+    SIZE(\name, 0)
 END_MACRO
 
 MACRO0(SETUP_GOT_NOSAVE)
diff --git a/runtime/gc/allocator/rosalloc.h b/runtime/gc/allocator/rosalloc.h
index 5b4ca80..dd2bb5d 100644
--- a/runtime/gc/allocator/rosalloc.h
+++ b/runtime/gc/allocator/rosalloc.h
@@ -439,9 +439,6 @@
   hash_set<Run*, hash_run, eq_run> full_runs_[kNumOfSizeBrackets];
   // The set of free pages.
   std::set<FreePageRun*> free_page_runs_ GUARDED_BY(lock_);
-  // The free page run whose end address is the end of the memory
-  // region that's managed by this allocator, if any.
-  FreePageRun* last_free_page_run_;
   // The current runs where the allocations are first attempted for
   // the size brackes that do not use thread-local
   // runs. current_runs_[i] is guarded by size_bracket_locks_[i].
diff --git a/runtime/gc/collector/mark_sweep.cc b/runtime/gc/collector/mark_sweep.cc
index 7b2bc3b..c39e56f 100644
--- a/runtime/gc/collector/mark_sweep.cc
+++ b/runtime/gc/collector/mark_sweep.cc
@@ -861,7 +861,7 @@
         size_t mark_stack_increment = std::min(mark_stack_delta, mark_stack_remaining);
         mark_stack_end -= mark_stack_increment;
         mark_stack_->PopBackCount(static_cast<int32_t>(mark_stack_increment));
-        DCHECK_EQ(mark_stack_end, mark_stack_->End());
+        DCHECK_EQ(mark_stack_end, const_cast<const art::mirror::Object **>(mark_stack_->End()));
         // Add the new task to the thread pool.
         auto* task = new CardScanTask(thread_pool, this, space->GetMarkBitmap(), card_begin,
                                       card_begin + card_increment, minimum_age,
diff --git a/runtime/interpreter/interpreter.cc b/runtime/interpreter/interpreter.cc
index 40d4ea3..abe7fe1 100644
--- a/runtime/interpreter/interpreter.cc
+++ b/runtime/interpreter/interpreter.cc
@@ -286,11 +286,39 @@
 }
 
 enum InterpreterImplKind {
-  kSwitchImpl,            // switch-based interpreter implementation.
-  kComputedGotoImplKind   // computed-goto-based interpreter implementation.
+  kSwitchImpl,            // Switch-based interpreter implementation.
+  kComputedGotoImplKind   // Computed-goto-based interpreter implementation.
 };
 
-static const InterpreterImplKind kInterpreterImplKind = kComputedGotoImplKind;
+#if !defined(__clang__)
+static constexpr InterpreterImplKind kInterpreterImplKind = kComputedGotoImplKind;
+#else
+// Clang 3.4 fails to build the goto interpreter implementation.
+static constexpr InterpreterImplKind kInterpreterImplKind = kSwitchImpl;
+template<bool do_access_check, bool transaction_active>
+JValue ExecuteGotoImpl(Thread* self, MethodHelper& mh, const DexFile::CodeItem* code_item,
+                       ShadowFrame& shadow_frame, JValue result_register) {
+  LOG(FATAL) << "UNREACHABLE";
+  exit(0);
+}
+// Explicit definitions of ExecuteGotoImpl.
+template SHARED_LOCKS_REQUIRED(Locks::mutator_lock_)
+JValue ExecuteGotoImpl<true, false>(Thread* self, MethodHelper& mh,
+                                    const DexFile::CodeItem* code_item,
+                                    ShadowFrame& shadow_frame, JValue result_register);
+template SHARED_LOCKS_REQUIRED(Locks::mutator_lock_)
+JValue ExecuteGotoImpl<false, false>(Thread* self, MethodHelper& mh,
+                                     const DexFile::CodeItem* code_item,
+                                     ShadowFrame& shadow_frame, JValue result_register);
+template SHARED_LOCKS_REQUIRED(Locks::mutator_lock_)
+JValue ExecuteGotoImpl<true, true>(Thread* self, MethodHelper& mh,
+                                    const DexFile::CodeItem* code_item,
+                                    ShadowFrame& shadow_frame, JValue result_register);
+template SHARED_LOCKS_REQUIRED(Locks::mutator_lock_)
+JValue ExecuteGotoImpl<false, true>(Thread* self, MethodHelper& mh,
+                                     const DexFile::CodeItem* code_item,
+                                     ShadowFrame& shadow_frame, JValue result_register);
+#endif
 
 static JValue Execute(Thread* self, MethodHelper& mh, const DexFile::CodeItem* code_item,
                       ShadowFrame& shadow_frame, JValue result_register)
diff --git a/runtime/interpreter/interpreter_common.h b/runtime/interpreter/interpreter_common.h
index a03e420..589e0b0 100644
--- a/runtime/interpreter/interpreter_common.h
+++ b/runtime/interpreter/interpreter_common.h
@@ -515,11 +515,11 @@
   return found_dex_pc;
 }
 
-static void UnexpectedOpcode(const Instruction* inst, MethodHelper& mh)
-  __attribute__((cold, noreturn, noinline));
+static inline void UnexpectedOpcode(const Instruction* inst, MethodHelper& mh)
+  __attribute__((cold, noreturn))
+  SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
 
-static void UnexpectedOpcode(const Instruction* inst, MethodHelper& mh)
-    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
+static inline void UnexpectedOpcode(const Instruction* inst, MethodHelper& mh) {
   LOG(FATAL) << "Unexpected instruction: " << inst->DumpString(&mh.GetDexFile());
   exit(0);  // Unreachable, keep GCC happy.
 }
diff --git a/runtime/jdwp/jdwp.h b/runtime/jdwp/jdwp.h
index 1ec795f..fdbdfeb 100644
--- a/runtime/jdwp/jdwp.h
+++ b/runtime/jdwp/jdwp.h
@@ -96,9 +96,9 @@
 };
 
 struct JdwpEvent;
-struct JdwpNetStateBase;
+class JdwpNetStateBase;
 struct ModBasket;
-struct Request;
+class Request;
 
 /*
  * State for JDWP functions.
diff --git a/runtime/mirror/object-inl.h b/runtime/mirror/object-inl.h
index 478cc36..484c21a 100644
--- a/runtime/mirror/object-inl.h
+++ b/runtime/mirror/object-inl.h
@@ -323,9 +323,9 @@
   size_t result;
   constexpr auto kNewFlags = static_cast<VerifyObjectFlags>(kVerifyFlags & ~kVerifyThis);
   if (IsArrayInstance<kVerifyFlags>()) {
-    result = AsArray<kNewFlags>()->SizeOf<>();
+    result = AsArray<kNewFlags>()->template SizeOf<kNewFlags>();
   } else if (IsClass<kNewFlags>()) {
-    result = AsClass<kNewFlags>()->SizeOf<kNewFlags>();
+    result = AsClass<kNewFlags>()->template SizeOf<kNewFlags>();
   } else {
     result = GetClass<kNewFlags>()->GetObjectSize();
   }
@@ -485,7 +485,6 @@
   if (kVerifyFlags & kVerifyWrites) {
     VerifyObject(new_value);
   }
-  HeapReference<Object> objref(HeapReference<Object>::FromMirrorPtr(new_value));
   byte* raw_addr = reinterpret_cast<byte*>(this) + field_offset.Int32Value();
   HeapReference<Object>* objref_addr = reinterpret_cast<HeapReference<Object>*>(raw_addr);
   if (UNLIKELY(is_volatile)) {
diff --git a/runtime/runtime.h b/runtime/runtime.h
index 249bb45..7f8e915 100644
--- a/runtime/runtime.h
+++ b/runtime/runtime.h
@@ -60,7 +60,7 @@
 class CompilerCallbacks;
 class DexFile;
 class InternTable;
-struct JavaVMExt;
+class JavaVMExt;
 class MonitorList;
 class MonitorPool;
 class SignalCatcher;
diff --git a/runtime/runtime_linux.cc b/runtime/runtime_linux.cc
index 4a166d7..f15e0bf 100644
--- a/runtime/runtime_linux.cc
+++ b/runtime/runtime_linux.cc
@@ -24,7 +24,7 @@
 #include "base/logging.h"
 #include "base/mutex.h"
 #include "base/stringprintf.h"
-#include "thread.h"
+#include "thread-inl.h"
 #include "utils.h"
 
 namespace art {
diff --git a/runtime/thread.h b/runtime/thread.h
index fcae9e4..6df2b1c 100644
--- a/runtime/thread.h
+++ b/runtime/thread.h
@@ -67,7 +67,7 @@
 class Context;
 struct DebugInvokeReq;
 class DexFile;
-struct JavaVMExt;
+class JavaVMExt;
 struct JNIEnvExt;
 class Monitor;
 class Runtime;
diff --git a/runtime/zip_archive_test.cc b/runtime/zip_archive_test.cc
index 0bf6767..c43fee5 100644
--- a/runtime/zip_archive_test.cc
+++ b/runtime/zip_archive_test.cc
@@ -32,10 +32,10 @@
 TEST_F(ZipArchiveTest, FindAndExtract) {
   std::string error_msg;
   UniquePtr<ZipArchive> zip_archive(ZipArchive::Open(GetLibCoreDexFileName().c_str(), &error_msg));
-  ASSERT_TRUE(zip_archive.get() != false) << error_msg;
+  ASSERT_TRUE(zip_archive.get() != nullptr) << error_msg;
   ASSERT_TRUE(error_msg.empty());
   UniquePtr<ZipEntry> zip_entry(zip_archive->Find("classes.dex", &error_msg));
-  ASSERT_TRUE(zip_entry.get() != false);
+  ASSERT_TRUE(zip_entry.get() != nullptr);
   ASSERT_TRUE(error_msg.empty());
 
   ScratchFile tmp;
diff --git a/tools/generate-operator-out.py b/tools/generate-operator-out.py
index 19266b4..56b8674 100755
--- a/tools/generate-operator-out.py
+++ b/tools/generate-operator-out.py
@@ -23,7 +23,7 @@
 import sys
 
 
-_ENUM_START_RE = re.compile(r'\benum\b\s+(\S+)\s+\{')
+_ENUM_START_RE = re.compile(r'\benum\b\s+(\S+)\s+:?.*\{')
 _ENUM_VALUE_RE = re.compile(r'([A-Za-z0-9_]+)(.*)')
 _ENUM_END_RE = re.compile(r'^\s*\};$')
 _ENUMS = {}