diff --git a/core/clang/HOST_CROSS_x86.mk b/core/clang/HOST_CROSS_x86.mk
index f7b2583e4a..bf48f955e9 100644
--- a/core/clang/HOST_CROSS_x86.mk
+++ b/core/clang/HOST_CROSS_x86.mk
@@ -1,39 +1 @@
-
-include $(BUILD_SYSTEM)/clang/x86.mk
-
-CLANG_CONFIG_x86_HOST_CROSS_TRIPLE := i686-pc-mingw32
-
-CLANG_CONFIG_x86_HOST_CROSS_EXTRA_ASFLAGS := \
-  $(CLANG_CONFIG_EXTRA_ASFLAGS) \
-  $(CLANG_CONFIG_HOST_CROSS_EXTRA_ASFLAGS) \
-  $(CLANG_CONFIG_x86_EXTRA_ASFLAGS) \
-  $(CLANG_CONFIG_x86_HOST_CROSS_COMBO_EXTRA_ASFLAGS) \
-  -target $(CLANG_CONFIG_x86_HOST_CROSS_TRIPLE)
-
-CLANG_CONFIG_x86_HOST_CROSS_EXTRA_CFLAGS := \
-  $(CLANG_CONFIG_EXTRA_CFLAGS) \
-  $(CLANG_CONFIG_HOST_CROSS_EXTRA_CFLAGS) \
-  $(CLANG_CONFIG_x86_EXTRA_CFLAGS) \
-  $(CLANG_CONFIG_x86_HOST_CROSS_COMBO_EXTRA_CFLAGS) \
-  $(CLANG_CONFIG_x86_HOST_CROSS_EXTRA_ASFLAGS)
-
-CLANG_CONFIG_x86_HOST_CROSS_EXTRA_CONLYFLAGS := \
-  $(CLANG_CONFIG_EXTRA_CONLYFLAGS) \
-  $(CLANG_CONFIG_HOST_CROSS_EXTRA_CONLYFLAGS) \
-  $(CLANG_CONFIG_x86_EXTRA_CONLYFLAGS) \
-  $(CLANG_CONFIG_x86_HOST_CROSS_COMBO_EXTRA_CONLYFLAGS)
-
-CLANG_CONFIG_x86_HOST_CROSS_EXTRA_CPPFLAGS := \
-  $(CLANG_CONFIG_EXTRA_CPPFLAGS) \
-  $(CLANG_CONFIG_HOST_CROSS_EXTRA_CPPFLAGS) \
-  $(CLANG_CONFIG_x86_EXTRA_CPPFLAGS) \
-  $(CLANG_CONFIG_x86_HOST_CROSS_COMBO_EXTRA_CPPFLAGS)
-
-CLANG_CONFIG_x86_HOST_CROSS_EXTRA_LDFLAGS := \
-  $(CLANG_CONFIG_EXTRA_LDFLAGS) \
-  $(CLANG_CONFIG_HOST_CROSS_EXTRA_LDFLAGS) \
-  $(CLANG_CONFIG_x86_EXTRA_LDFLAGS) \
-  $(CLANG_CONFIG_x86_HOST_CROSS_COMBO_EXTRA_LDFLAGS) \
-  -target $(CLANG_CONFIG_x86_HOST_CROSS_TRIPLE)
-
 $(clang_2nd_arch_prefix)HOST_CROSS_LIBPROFILE_RT := $(LLVM_RTLIB_PATH)/libclang_rt.profile-i686.a
diff --git a/core/clang/HOST_CROSS_x86_64.mk b/core/clang/HOST_CROSS_x86_64.mk
index 6d67a7e4c3..f921a1c1c3 100644
--- a/core/clang/HOST_CROSS_x86_64.mk
+++ b/core/clang/HOST_CROSS_x86_64.mk
@@ -1,39 +1 @@
-
-include $(BUILD_SYSTEM)/clang/x86_64.mk
-
-CLANG_CONFIG_x86_64_HOST_CROSS_TRIPLE := x86_64-pc-mingw32
-
-CLANG_CONFIG_x86_64_HOST_CROSS_EXTRA_ASFLAGS := \
-  $(CLANG_CONFIG_EXTRA_ASFLAGS) \
-  $(CLANG_CONFIG_HOST_CROSS_EXTRA_ASFLAGS) \
-  $(CLANG_CONFIG_x86_64_EXTRA_ASFLAGS) \
-  $(CLANG_CONFIG_x86_64_HOST_CROSS_COMBO_EXTRA_ASFLAGS) \
-  -target $(CLANG_CONFIG_x86_64_HOST_CROSS_TRIPLE)
-
-CLANG_CONFIG_x86_64_HOST_CROSS_EXTRA_CFLAGS := \
-  $(CLANG_CONFIG_EXTRA_CFLAGS) \
-  $(CLANG_CONFIG_HOST_CROSS_EXTRA_CFLAGS) \
-  $(CLANG_CONFIG_x86_64_EXTRA_CFLAGS) \
-  $(CLANG_CONFIG_x86_64_HOST_CROSS_COMBO_EXTRA_CFLAGS) \
-  $(CLANG_CONFIG_x86_64_HOST_CROSS_EXTRA_ASFLAGS)
-
-CLANG_CONFIG_x86_64_HOST_CROSS_EXTRA_CONLYFLAGS := \
-  $(CLANG_CONFIG_EXTRA_CONLYFLAGS) \
-  $(CLANG_CONFIG_HOST_CROSS_EXTRA_CONLYFLAGS) \
-  $(CLANG_CONFIG_x86_64_EXTRA_CONLYFLAGS) \
-  $(CLANG_CONFIG_x86_64_HOST_CROSS_COMBO_EXTRA_CONLYFLAGS)
-
-CLANG_CONFIG_x86_64_HOST_CROSS_EXTRA_CPPFLAGS := \
-  $(CLANG_CONFIG_EXTRA_CPPFLAGS) \
-  $(CLANG_CONFIG_HOST_CROSS_EXTRA_CPPFLAGS) \
-  $(CLANG_CONFIG_x86_64_EXTRA_CPPFLAGS) \
-  $(CLANG_CONFIG_x86_64_HOST_CROSS_COMBO_EXTRA_CPPFLAGS)
-
-CLANG_CONFIG_x86_64_HOST_CROSS_EXTRA_LDFLAGS := \
-  $(CLANG_CONFIG_EXTRA_LDFLAGS) \
-  $(CLANG_CONFIG_HOST_CROSS_EXTRA_LDFLAGS) \
-  $(CLANG_CONFIG_x86_64_EXTRA_LDFLAGS) \
-  $(CLANG_CONFIG_x86_64_HOST_CROSS_COMBO_EXTRA_LDFLAGS) \
-  -target $(CLANG_CONFIG_x86_64_HOST_CROSS_TRIPLE)
-
 $(clang_2nd_arch_prefix)HOST_CROSS_LIBPROFILE_RT := $(LLVM_RTLIB_PATH)/libclang_rt.profile-x86_64.a
diff --git a/core/clang/HOST_x86.mk b/core/clang/HOST_x86.mk
index b6e12058ff..0722b2a6e7 100644
--- a/core/clang/HOST_x86.mk
+++ b/core/clang/HOST_x86.mk
@@ -1,53 +1 @@
-
-include $(BUILD_SYSTEM)/clang/x86.mk
-include $(BUILD_SYSTEM)/clang/HOST_x86_common.mk
-
-ifeq ($(HOST_OS),linux)
-CLANG_CONFIG_x86_HOST_TRIPLE := i686-linux-gnu
-CLANG_CONFIG_x86_HOST_COMBO_EXTRA_ASFLAGS := $(CLANG_CONFIG_x86_LINUX_HOST_EXTRA_ASFLAGS)
-CLANG_CONFIG_x86_HOST_COMBO_EXTRA_CFLAGS := $(CLANG_CONFIG_x86_LINUX_HOST_EXTRA_CFLAGS)
-CLANG_CONFIG_x86_HOST_COMBO_EXTRA_CPPFLAGS := $(CLANG_CONFIG_x86_LINUX_HOST_EXTRA_CPPFLAGS)
-CLANG_CONFIG_x86_HOST_COMBO_EXTRA_LDFLAGS := $(CLANG_CONFIG_x86_LINUX_HOST_EXTRA_LDFLAGS)
-endif
-ifeq ($(HOST_OS),darwin)
-CLANG_CONFIG_x86_HOST_TRIPLE := i686-apple-darwin
-CLANG_CONFIG_x86_HOST_COMBO_EXTRA_ASFLAGS := $(CLANG_CONFIG_x86_DARWIN_HOST_EXTRA_ASFLAGS)
-CLANG_CONFIG_x86_HOST_COMBO_EXTRA_CFLAGS := $(CLANG_CONFIG_x86_DARWIN_HOST_EXTRA_CFLAGS)
-CLANG_CONFIG_x86_HOST_COMBO_EXTRA_CPPFLAGS := $(CLANG_CONFIG_x86_DARWIN_HOST_EXTRA_CPPFLAGS)
-CLANG_CONFIG_x86_HOST_COMBO_EXTRA_LDFLAGS := $(CLANG_CONFIG_x86_DARWIN_HOST_EXTRA_LDFLAGS)
-endif
-
-CLANG_CONFIG_x86_HOST_EXTRA_ASFLAGS := \
-  $(CLANG_CONFIG_EXTRA_ASFLAGS) \
-  $(CLANG_CONFIG_HOST_EXTRA_ASFLAGS) \
-  $(CLANG_CONFIG_x86_EXTRA_ASFLAGS) \
-  $(CLANG_CONFIG_x86_HOST_COMBO_EXTRA_ASFLAGS) \
-  -target $(CLANG_CONFIG_x86_HOST_TRIPLE)
-
-CLANG_CONFIG_x86_HOST_EXTRA_CFLAGS := \
-  $(CLANG_CONFIG_EXTRA_CFLAGS) \
-  $(CLANG_CONFIG_HOST_EXTRA_CFLAGS) \
-  $(CLANG_CONFIG_x86_EXTRA_CFLAGS) \
-  $(CLANG_CONFIG_x86_HOST_COMBO_EXTRA_CFLAGS) \
-  $(CLANG_CONFIG_x86_HOST_EXTRA_ASFLAGS)
-
-CLANG_CONFIG_x86_HOST_EXTRA_CONLYFLAGS := \
-  $(CLANG_CONFIG_EXTRA_CONLYFLAGS) \
-  $(CLANG_CONFIG_HOST_EXTRA_CONLYFLAGS) \
-  $(CLANG_CONFIG_x86_EXTRA_CONLYFLAGS) \
-  $(CLANG_CONFIG_x86_HOST_COMBO_EXTRA_CONLYFLAGS)
-
-CLANG_CONFIG_x86_HOST_EXTRA_CPPFLAGS := \
-  $(CLANG_CONFIG_EXTRA_CPPFLAGS) \
-  $(CLANG_CONFIG_HOST_EXTRA_CPPFLAGS) \
-  $(CLANG_CONFIG_x86_EXTRA_CPPFLAGS) \
-  $(CLANG_CONFIG_x86_HOST_COMBO_EXTRA_CPPFLAGS)
-
-CLANG_CONFIG_x86_HOST_EXTRA_LDFLAGS := \
-  $(CLANG_CONFIG_EXTRA_LDFLAGS) \
-  $(CLANG_CONFIG_HOST_EXTRA_LDFLAGS) \
-  $(CLANG_CONFIG_x86_EXTRA_LDFLAGS) \
-  $(CLANG_CONFIG_x86_HOST_COMBO_EXTRA_LDFLAGS) \
-  -target $(CLANG_CONFIG_x86_HOST_TRIPLE)
-
 $(clang_2nd_arch_prefix)HOST_LIBPROFILE_RT := $(LLVM_RTLIB_PATH)/libclang_rt.profile-i686.a
diff --git a/core/clang/HOST_x86_64.mk b/core/clang/HOST_x86_64.mk
index e4f72f8dfa..4fdffd844d 100644
--- a/core/clang/HOST_x86_64.mk
+++ b/core/clang/HOST_x86_64.mk
@@ -1,53 +1 @@
-
-include $(BUILD_SYSTEM)/clang/x86_64.mk
-include $(BUILD_SYSTEM)/clang/HOST_x86_common.mk
-
-ifeq ($(HOST_OS),linux)
-CLANG_CONFIG_x86_64_HOST_TRIPLE := x86_64-linux-gnu
-CLANG_CONFIG_x86_64_HOST_COMBO_EXTRA_ASFLAGS := $(CLANG_CONFIG_x86_LINUX_HOST_EXTRA_ASFLAGS)
-CLANG_CONFIG_x86_64_HOST_COMBO_EXTRA_CFLAGS := $(CLANG_CONFIG_x86_LINUX_HOST_EXTRA_CFLAGS)
-CLANG_CONFIG_x86_64_HOST_COMBO_EXTRA_CPPFLAGS := $(CLANG_CONFIG_x86_LINUX_HOST_EXTRA_CPPFLAGS)
-CLANG_CONFIG_x86_64_HOST_COMBO_EXTRA_LDFLAGS := $(CLANG_CONFIG_x86_LINUX_HOST_EXTRA_LDFLAGS)
-endif
-ifeq ($(HOST_OS),darwin)
-CLANG_CONFIG_x86_64_HOST_TRIPLE := x86_64-apple-darwin
-CLANG_CONFIG_x86_64_HOST_COMBO_EXTRA_ASFLAGS := $(CLANG_CONFIG_x86_DARWIN_HOST_EXTRA_ASFLAGS)
-CLANG_CONFIG_x86_64_HOST_COMBO_EXTRA_CFLAGS := $(CLANG_CONFIG_x86_DARWIN_HOST_EXTRA_CFLAGS)
-CLANG_CONFIG_x86_64_HOST_COMBO_EXTRA_CPPFLAGS := $(CLANG_CONFIG_x86_DARWIN_HOST_EXTRA_CPPFLAGS)
-CLANG_CONFIG_x86_64_HOST_COMBO_EXTRA_LDFLAGS := $(CLANG_CONFIG_x86_DARWIN_HOST_EXTRA_LDFLAGS)
-endif
-
-CLANG_CONFIG_x86_64_HOST_EXTRA_ASFLAGS := \
-  $(CLANG_CONFIG_EXTRA_ASFLAGS) \
-  $(CLANG_CONFIG_HOST_EXTRA_ASFLAGS) \
-  $(CLANG_CONFIG_x86_64_EXTRA_ASFLAGS) \
-  $(CLANG_CONFIG_x86_64_HOST_COMBO_EXTRA_ASFLAGS) \
-  -target $(CLANG_CONFIG_x86_64_HOST_TRIPLE)
-
-CLANG_CONFIG_x86_64_HOST_EXTRA_CFLAGS := \
-  $(CLANG_CONFIG_EXTRA_CFLAGS) \
-  $(CLANG_CONFIG_HOST_EXTRA_CFLAGS) \
-  $(CLANG_CONFIG_x86_64_EXTRA_CFLAGS) \
-  $(CLANG_CONFIG_x86_64_HOST_COMBO_EXTRA_CFLAGS) \
-  $(CLANG_CONFIG_x86_64_HOST_EXTRA_ASFLAGS)
-
-CLANG_CONFIG_x86_64_HOST_EXTRA_CONLYFLAGS := \
-  $(CLANG_CONFIG_EXTRA_CONLYFLAGS) \
-  $(CLANG_CONFIG_HOST_EXTRA_CONLYFLAGS) \
-  $(CLANG_CONFIG_x86_64_EXTRA_CONLYFLAGS) \
-  $(CLANG_CONFIG_x86_64_HOST_COMBO_EXTRA_CONLYFLAGS)
-
-CLANG_CONFIG_x86_64_HOST_EXTRA_CPPFLAGS := \
-  $(CLANG_CONFIG_EXTRA_CPPFLAGS) \
-  $(CLANG_CONFIG_HOST_EXTRA_CPPFLAGS) \
-  $(CLANG_CONFIG_x86_64_EXTRA_CPPFLAGS) \
-  $(CLANG_CONFIG_x86_64_HOST_COMBO_EXTRA_CPPFLAGS)
-
-CLANG_CONFIG_x86_64_HOST_EXTRA_LDFLAGS := \
-  $(CLANG_CONFIG_EXTRA_LDFLAGS) \
-  $(CLANG_CONFIG_HOST_EXTRA_LDFLAGS) \
-  $(CLANG_CONFIG_x86_64_EXTRA_LDFLAGS) \
-  $(CLANG_CONFIG_x86_64_HOST_COMBO_EXTRA_LDFLAGS) \
-  -target $(CLANG_CONFIG_x86_64_HOST_TRIPLE)
-
 HOST_LIBPROFILE_RT := $(LLVM_RTLIB_PATH)/libclang_rt.profile-x86_64.a
diff --git a/core/clang/HOST_x86_common.mk b/core/clang/HOST_x86_common.mk
deleted file mode 100644
index 733329732f..0000000000
--- a/core/clang/HOST_x86_common.mk
+++ /dev/null
@@ -1,51 +0,0 @@
-# Shared by HOST_x86.mk and HOST_x86_64.mk.
-
-ifeq ($(HOST_OS),darwin)
-CLANG_CONFIG_x86_DARWIN_HOST_EXTRA_ASFLAGS := \
-  -integrated-as
-
-CLANG_CONFIG_x86_DARWIN_HOST_EXTRA_CFLAGS := \
-  -integrated-as
-
-CLANG_CONFIG_x86_DARWIN_HOST_EXTRA_CFLAGS += -fstack-protector-strong
-endif
-
-ifeq ($(HOST_OS),linux)
-CLANG_CONFIG_x86_LINUX_HOST_EXTRA_ASFLAGS := \
-  --gcc-toolchain=$($(clang_2nd_arch_prefix)HOST_TOOLCHAIN_FOR_CLANG) \
-  --sysroot $($(clang_2nd_arch_prefix)HOST_TOOLCHAIN_FOR_CLANG)/sysroot \
-  -B$($(clang_2nd_arch_prefix)HOST_TOOLCHAIN_FOR_CLANG)/x86_64-linux/bin
-
-CLANG_CONFIG_x86_LINUX_HOST_EXTRA_CFLAGS := \
-  --gcc-toolchain=$($(clang_2nd_arch_prefix)HOST_TOOLCHAIN_FOR_CLANG)
-
-CLANG_CONFIG_x86_LINUX_HOST_EXTRA_CFLAGS += -fstack-protector-strong
-
-ifneq ($(strip $($(clang_2nd_arch_prefix)HOST_IS_64_BIT)),)
-CLANG_CONFIG_x86_LINUX_HOST_EXTRA_CPPFLAGS := \
-  -isystem $($(clang_2nd_arch_prefix)HOST_TOOLCHAIN_FOR_CLANG)/x86_64-linux/include/c++/4.8 \
-  -isystem $($(clang_2nd_arch_prefix)HOST_TOOLCHAIN_FOR_CLANG)/x86_64-linux/include/c++/4.8/x86_64-linux \
-  -isystem $($(clang_2nd_arch_prefix)HOST_TOOLCHAIN_FOR_CLANG)/x86_64-linux/include/c++/4.8/backward
-
-CLANG_CONFIG_x86_LINUX_HOST_EXTRA_LDFLAGS := \
-  --gcc-toolchain=$($(clang_2nd_arch_prefix)HOST_TOOLCHAIN_FOR_CLANG) \
-  --sysroot $($(clang_2nd_arch_prefix)HOST_TOOLCHAIN_FOR_CLANG)/sysroot \
-  -B$($(clang_2nd_arch_prefix)HOST_TOOLCHAIN_FOR_CLANG)/x86_64-linux/bin \
-  -B$($(clang_2nd_arch_prefix)HOST_TOOLCHAIN_FOR_CLANG)/lib/gcc/x86_64-linux/4.8 \
-  -L$($(clang_2nd_arch_prefix)HOST_TOOLCHAIN_FOR_CLANG)/lib/gcc/x86_64-linux/4.8 \
-  -L$($(clang_2nd_arch_prefix)HOST_TOOLCHAIN_FOR_CLANG)/x86_64-linux/lib64
-else
-CLANG_CONFIG_x86_LINUX_HOST_EXTRA_CPPFLAGS := \
-  -isystem $($(clang_2nd_arch_prefix)HOST_TOOLCHAIN_FOR_CLANG)/x86_64-linux/include/c++/4.8 \
-  -isystem $($(clang_2nd_arch_prefix)HOST_TOOLCHAIN_FOR_CLANG)/x86_64-linux/include/c++/4.8/x86_64-linux/32 \
-  -isystem $($(clang_2nd_arch_prefix)HOST_TOOLCHAIN_FOR_CLANG)/x86_64-linux/include/c++/4.8/backward
-
-CLANG_CONFIG_x86_LINUX_HOST_EXTRA_LDFLAGS := \
-  --gcc-toolchain=$($(clang_2nd_arch_prefix)HOST_TOOLCHAIN_FOR_CLANG) \
-  --sysroot $($(clang_2nd_arch_prefix)HOST_TOOLCHAIN_FOR_CLANG)/sysroot \
-  -B$($(clang_2nd_arch_prefix)HOST_TOOLCHAIN_FOR_CLANG)/x86_64-linux/bin \
-  -B$($(clang_2nd_arch_prefix)HOST_TOOLCHAIN_FOR_CLANG)/lib/gcc/x86_64-linux/4.8/32 \
-  -L$($(clang_2nd_arch_prefix)HOST_TOOLCHAIN_FOR_CLANG)/lib/gcc/x86_64-linux/4.8/32 \
-  -L$($(clang_2nd_arch_prefix)HOST_TOOLCHAIN_FOR_CLANG)/x86_64-linux/lib32
-endif
-endif  # Linux
diff --git a/core/clang/TARGET_arm.mk b/core/clang/TARGET_arm.mk
index a0de716a30..30313f9755 100644
--- a/core/clang/TARGET_arm.mk
+++ b/core/clang/TARGET_arm.mk
@@ -1,42 +1,3 @@
-
-include $(BUILD_SYSTEM)/clang/arm.mk
-
-CLANG_CONFIG_arm_TARGET_TRIPLE := arm-linux-androideabi
-CLANG_CONFIG_arm_TARGET_TOOLCHAIN_PREFIX := \
-  $($(clang_2nd_arch_prefix)TARGET_TOOLCHAIN_ROOT)/$(CLANG_CONFIG_arm_TARGET_TRIPLE)/bin
-
-CLANG_CONFIG_arm_TARGET_EXTRA_ASFLAGS := \
-  $(CLANG_CONFIG_EXTRA_ASFLAGS) \
-  $(CLANG_CONFIG_TARGET_EXTRA_ASFLAGS) \
-  $(CLANG_CONFIG_arm_EXTRA_ASFLAGS) \
-  -target $(CLANG_CONFIG_arm_TARGET_TRIPLE) \
-  -B$(CLANG_CONFIG_arm_TARGET_TOOLCHAIN_PREFIX)
-
-CLANG_CONFIG_arm_TARGET_EXTRA_CFLAGS := \
-  $(CLANG_CONFIG_EXTRA_CFLAGS) \
-  $(CLANG_CONFIG_TARGET_EXTRA_CFLAGS) \
-  $(CLANG_CONFIG_arm_EXTRA_CFLAGS) \
-  -target $(CLANG_CONFIG_arm_TARGET_TRIPLE) \
-  $(CLANG_CONFIG_arm_TARGET_EXTRA_ASFLAGS)
-
-CLANG_CONFIG_arm_TARGET_EXTRA_CONLYFLAGS := \
-  $(CLANG_CONFIG_EXTRA_CONLYFLAGS) \
-  $(CLANG_CONFIG_TARGET_EXTRA_CONLYFLAGS) \
-  $(CLANG_CONFIG_arm_EXTRA_CONLYFLAGS)
-
-CLANG_CONFIG_arm_TARGET_EXTRA_CPPFLAGS := \
-  $(CLANG_CONFIG_EXTRA_CPPFLAGS) \
-  $(CLANG_CONFIG_TARGET_EXTRA_CPPFLAGS) \
-  $(CLANG_CONFIG_arm_EXTRA_CPPFLAGS)
-
-CLANG_CONFIG_arm_TARGET_EXTRA_LDFLAGS := \
-  $(CLANG_CONFIG_EXTRA_LDFLAGS) \
-  $(CLANG_CONFIG_TARGET_EXTRA_LDFLAGS) \
-  $(CLANG_CONFIG_arm_EXTRA_LDFLAGS) \
-  -target $(CLANG_CONFIG_arm_TARGET_TRIPLE) \
-  -B$(CLANG_CONFIG_arm_TARGET_TOOLCHAIN_PREFIX)
-
-
 $(clang_2nd_arch_prefix)RS_TRIPLE := armv7-linux-androideabi
 $(clang_2nd_arch_prefix)RS_TRIPLE_CFLAGS :=
 $(clang_2nd_arch_prefix)RS_COMPAT_TRIPLE := armv7-none-linux-gnueabi
@@ -44,5 +5,4 @@ $(clang_2nd_arch_prefix)RS_COMPAT_TRIPLE := armv7-none-linux-gnueabi
 $(clang_2nd_arch_prefix)TARGET_LIBPROFILE_RT := $(LLVM_RTLIB_PATH)/libclang_rt.profile-arm-android.a
 
 # Address sanitizer clang config
-$(clang_2nd_arch_prefix)ADDRESS_SANITIZER_RUNTIME_LIBRARY := libclang_rt.asan-arm-android
 $(clang_2nd_arch_prefix)ADDRESS_SANITIZER_LINKER := /system/bin/linker_asan
diff --git a/core/clang/TARGET_arm64.mk b/core/clang/TARGET_arm64.mk
index cb62c6105b..d504600762 100644
--- a/core/clang/TARGET_arm64.mk
+++ b/core/clang/TARGET_arm64.mk
@@ -1,41 +1,3 @@
-
-include $(BUILD_SYSTEM)/clang/arm64.mk
-
-CLANG_CONFIG_arm64_TARGET_TRIPLE := aarch64-linux-android
-CLANG_CONFIG_arm64_TARGET_TOOLCHAIN_PREFIX := \
-  $(TARGET_TOOLCHAIN_ROOT)/$(CLANG_CONFIG_arm64_TARGET_TRIPLE)/bin
-
-CLANG_CONFIG_arm64_TARGET_EXTRA_ASFLAGS := \
-  $(CLANG_CONFIG_EXTRA_ASFLAGS) \
-  $(CLANG_CONFIG_TARGET_EXTRA_ASFLAGS) \
-  $(CLANG_CONFIG_arm64_EXTRA_ASFLAGS) \
-  -target $(CLANG_CONFIG_arm64_TARGET_TRIPLE) \
-  -B$(CLANG_CONFIG_arm64_TARGET_TOOLCHAIN_PREFIX)
-
-CLANG_CONFIG_arm64_TARGET_EXTRA_CFLAGS := \
-  $(CLANG_CONFIG_EXTRA_CFLAGS) \
-  $(CLANG_CONFIG_TARGET_EXTRA_CFLAGS) \
-  $(CLANG_CONFIG_arm64_EXTRA_CFLAGS) \
-  $(CLANG_CONFIG_arm64_TARGET_EXTRA_ASFLAGS)
-
-CLANG_CONFIG_arm64_TARGET_EXTRA_CONLYFLAGS := \
-  $(CLANG_CONFIG_EXTRA_CONLYFLAGS) \
-  $(CLANG_CONFIG_TARGET_EXTRA_CONLYFLAGS) \
-  $(CLANG_CONFIG_arm64_EXTRA_CONLYFLAGS)
-
-CLANG_CONFIG_arm64_TARGET_EXTRA_CPPFLAGS := \
-  $(CLANG_CONFIG_EXTRA_CPPFLAGS) \
-  $(CLANG_CONFIG_TARGET_EXTRA_CPPFLAGS) \
-  $(CLANG_CONFIG_arm64_EXTRA_CPPFLAGS) \
-
-CLANG_CONFIG_arm64_TARGET_EXTRA_LDFLAGS := \
-  $(CLANG_CONFIG_EXTRA_LDFLAGS) \
-  $(CLANG_CONFIG_TARGET_EXTRA_LDFLAGS) \
-  $(CLANG_CONFIG_arm64_EXTRA_LDFLAGS) \
-  -target $(CLANG_CONFIG_arm64_TARGET_TRIPLE) \
-  -B$(CLANG_CONFIG_arm64_TARGET_TOOLCHAIN_PREFIX)
-
-
 RS_TRIPLE := aarch64-linux-android
 RS_TRIPLE_CFLAGS :=
 RS_COMPAT_TRIPLE := aarch64-linux-android
@@ -43,5 +5,4 @@ RS_COMPAT_TRIPLE := aarch64-linux-android
 TARGET_LIBPROFILE_RT := $(LLVM_RTLIB_PATH)/libclang_rt.profile-aarch64-android.a
 
 # Address sanitizer clang config
-ADDRESS_SANITIZER_RUNTIME_LIBRARY := libclang_rt.asan-aarch64-android
 ADDRESS_SANITIZER_LINKER := /system/bin/linker_asan64
diff --git a/core/clang/TARGET_mips.mk b/core/clang/TARGET_mips.mk
index 9e0a4173a5..df96c5a5f6 100644
--- a/core/clang/TARGET_mips.mk
+++ b/core/clang/TARGET_mips.mk
@@ -1,42 +1,3 @@
-
-include $(BUILD_SYSTEM)/clang/mips.mk
-
-CLANG_CONFIG_mips_TARGET_TRIPLE := mipsel-linux-android
-CLANG_CONFIG_mips_TARGET_TOOLCHAIN_PREFIX := \
-  $($(clang_2nd_arch_prefix)TARGET_TOOLCHAIN_ROOT)/mips64el-linux-android/bin
-
-CLANG_CONFIG_mips_TARGET_EXTRA_ASFLAGS := \
-  $(CLANG_CONFIG_EXTRA_ASFLAGS) \
-  $(CLANG_CONFIG_TARGET_EXTRA_ASFLAGS) \
-  $(CLANG_CONFIG_mips_EXTRA_ASFLAGS) \
-  -fPIC \
-  -target $(CLANG_CONFIG_mips_TARGET_TRIPLE) \
-  -B$(CLANG_CONFIG_mips_TARGET_TOOLCHAIN_PREFIX)
-
-CLANG_CONFIG_mips_TARGET_EXTRA_CFLAGS := \
-  $(CLANG_CONFIG_EXTRA_CFLAGS) \
-  $(CLANG_CONFIG_TARGET_EXTRA_CFLAGS) \
-  $(CLANG_CONFIG_mips_EXTRA_CFLAGS) \
-  $(CLANG_CONFIG_mips_TARGET_EXTRA_ASFLAGS)
-
-CLANG_CONFIG_mips_TARGET_EXTRA_CONLYFLAGS := \
-  $(CLANG_CONFIG_EXTRA_CONLYFLAGS) \
-  $(CLANG_CONFIG_TARGET_EXTRA_CONLYFLAGS) \
-  $(CLANG_CONFIG_mips_EXTRA_CONLYFLAGS)
-
-CLANG_CONFIG_mips_TARGET_EXTRA_CPPFLAGS := \
-  $(CLANG_CONFIG_EXTRA_CPPFLAGS) \
-  $(CLANG_CONFIG_TARGET_EXTRA_CPPFLAGS) \
-  $(CLANG_CONFIG_mips_EXTRA_CPPFLAGS) \
-
-CLANG_CONFIG_mips_TARGET_EXTRA_LDFLAGS := \
-  $(CLANG_CONFIG_EXTRA_LDFLAGS) \
-  $(CLANG_CONFIG_TARGET_EXTRA_LDFLAGS) \
-  $(CLANG_CONFIG_mips_EXTRA_LDFLAGS) \
-  -target $(CLANG_CONFIG_mips_TARGET_TRIPLE) \
-  -B$(CLANG_CONFIG_mips_TARGET_TOOLCHAIN_PREFIX)
-
-
 $(clang_2nd_arch_prefix)RS_TRIPLE := armv7-linux-androideabi
 $(clang_2nd_arch_prefix)RS_TRIPLE_CFLAGS :=
 RS_COMPAT_TRIPLE := mipsel-linux-android
@@ -44,5 +5,4 @@ RS_COMPAT_TRIPLE := mipsel-linux-android
 $(clang_2nd_arch_prefix)TARGET_LIBPROFILE_RT := $(LLVM_RTLIB_PATH)/libclang_rt.profile-mipsel-android.a
 
 # Address sanitizer clang config
-$(clang_2nd_arch_prefix)ADDRESS_SANITIZER_RUNTIME_LIBRARY := libclang_rt.asan-mips-android
 $(clang_2nd_arch_prefix)ADDRESS_SANITIZER_LINKER := /system/bin/linker_asan
diff --git a/core/clang/TARGET_mips64.mk b/core/clang/TARGET_mips64.mk
index 20eae5a55a..785752a520 100644
--- a/core/clang/TARGET_mips64.mk
+++ b/core/clang/TARGET_mips64.mk
@@ -1,41 +1,3 @@
-
-include $(BUILD_SYSTEM)/clang/mips64.mk
-
-CLANG_CONFIG_mips64_TARGET_TRIPLE := mips64el-linux-android
-CLANG_CONFIG_mips64_TARGET_TOOLCHAIN_PREFIX := \
-  $(TARGET_TOOLCHAIN_ROOT)/$(CLANG_CONFIG_mips64_TARGET_TRIPLE)/bin
-
-CLANG_CONFIG_mips64_TARGET_EXTRA_ASFLAGS := \
-  $(CLANG_CONFIG_EXTRA_ASFLAGS) \
-  $(CLANG_CONFIG_TARGET_EXTRA_ASFLAGS) \
-  $(CLANG_CONFIG_mips64_EXTRA_ASFLAGS) \
-  -target $(CLANG_CONFIG_mips64_TARGET_TRIPLE) \
-  -B$(CLANG_CONFIG_mips64_TARGET_TOOLCHAIN_PREFIX)
-
-CLANG_CONFIG_mips64_TARGET_EXTRA_CFLAGS := \
-  $(CLANG_CONFIG_EXTRA_CFLAGS) \
-  $(CLANG_CONFIG_TARGET_EXTRA_CFLAGS) \
-  $(CLANG_CONFIG_mips64_EXTRA_CFLAGS) \
-  $(CLANG_CONFIG_mips64_TARGET_EXTRA_ASFLAGS)
-
-CLANG_CONFIG_mips64_TARGET_EXTRA_CONLYFLAGS := \
-  $(CLANG_CONFIG_EXTRA_CONLYFLAGS) \
-  $(CLANG_CONFIG_TARGET_EXTRA_CONLYFLAGS) \
-  $(CLANG_CONFIG_mips64_EXTRA_CONLYFLAGS)
-
-CLANG_CONFIG_mips64_TARGET_EXTRA_CPPFLAGS := \
-  $(CLANG_CONFIG_EXTRA_CPPFLAGS) \
-  $(CLANG_CONFIG_TARGET_EXTRA_CPPFLAGS) \
-  $(CLANG_CONFIG_mips64_EXTRA_CPPFLAGS) \
-
-CLANG_CONFIG_mips64_TARGET_EXTRA_LDFLAGS := \
-  $(CLANG_CONFIG_EXTRA_LDFLAGS) \
-  $(CLANG_CONFIG_TARGET_EXTRA_LDFLAGS) \
-  $(CLANG_CONFIG_mips64_EXTRA_LDFLAGS) \
-  -target $(CLANG_CONFIG_mips64_TARGET_TRIPLE) \
-  -B$(CLANG_CONFIG_mips64_TARGET_TOOLCHAIN_PREFIX)
-
-
 RS_TRIPLE := aarch64-linux-android
 RS_TRIPLE_CFLAGS :=
 RS_COMPAT_TRIPLE := mips64el-linux-android
@@ -43,5 +5,4 @@ RS_COMPAT_TRIPLE := mips64el-linux-android
 TARGET_LIBPROFILE_RT := $(LLVM_RTLIB_PATH)/libclang_rt.profile-mips64el-android.a
 
 # Address sanitizer clang config
-$(clang_2nd_arch_prefix)ADDRESS_SANITIZER_RUNTIME_LIBRARY := libclang_rt.asan-mips64-android
 $(clang_2nd_arch_prefix)ADDRESS_SANITIZER_LINKER := /system/bin/linker_asan64
diff --git a/core/clang/TARGET_x86.mk b/core/clang/TARGET_x86.mk
index d319a01de5..f00eb41027 100644
--- a/core/clang/TARGET_x86.mk
+++ b/core/clang/TARGET_x86.mk
@@ -1,48 +1,3 @@
-
-include $(BUILD_SYSTEM)/clang/x86.mk
-
-CLANG_CONFIG_x86_TARGET_TRIPLE := i686-linux-android
-# NOTE: There is no i686-linux-android prebuilt, so we must hardcode the
-# x86_64 target instead.
-CLANG_CONFIG_x86_TARGET_TOOLCHAIN_PREFIX := \
-  $($(clang_2nd_arch_prefix)TARGET_TOOLCHAIN_ROOT)/x86_64-linux-android/bin
-
-CLANG_CONFIG_x86_TARGET_EXTRA_ASFLAGS := \
-  $(CLANG_CONFIG_EXTRA_ASFLAGS) \
-  $(CLANG_CONFIG_TARGET_EXTRA_ASFLAGS) \
-  $(CLANG_CONFIG_x86_EXTRA_ASFLAGS) \
-  -target $(CLANG_CONFIG_x86_TARGET_TRIPLE) \
-  -B$(CLANG_CONFIG_x86_TARGET_TOOLCHAIN_PREFIX)
-
-CLANG_CONFIG_x86_TARGET_EXTRA_CFLAGS := \
-  $(CLANG_CONFIG_EXTRA_CFLAGS) \
-  $(CLANG_CONFIG_TARGET_EXTRA_CFLAGS) \
-  $(CLANG_CONFIG_x86_EXTRA_CFLAGS) \
-  $(CLANG_CONFIG_x86_TARGET_EXTRA_ASFLAGS) \
-  -mstackrealign
-
-# -mstackrealign is needed to realign stack in native code
-# that could be called from JNI, so that movaps instruction
-# will work on assumed stack aligned local variables.
-
-CLANG_CONFIG_x86_TARGET_EXTRA_CONLYFLAGS := \
-  $(CLANG_CONFIG_EXTRA_CONLYFLAGS) \
-  $(CLANG_CONFIG_TARGET_EXTRA_CONLYFLAGS) \
-  $(CLANG_CONFIG_x86_EXTRA_CONLYFLAGS)
-
-CLANG_CONFIG_x86_TARGET_EXTRA_CPPFLAGS := \
-  $(CLANG_CONFIG_EXTRA_CPPFLAGS) \
-  $(CLANG_CONFIG_TARGET_EXTRA_CPPFLAGS) \
-  $(CLANG_CONFIG_x86_EXTRA_CPPFLAGS) \
-
-CLANG_CONFIG_x86_TARGET_EXTRA_LDFLAGS := \
-  $(CLANG_CONFIG_EXTRA_LDFLAGS) \
-  $(CLANG_CONFIG_TARGET_EXTRA_LDFLAGS) \
-  $(CLANG_CONFIG_x86_EXTRA_LDFLAGS) \
-  -target $(CLANG_CONFIG_x86_TARGET_TRIPLE) \
-  -B$(CLANG_CONFIG_x86_TARGET_TOOLCHAIN_PREFIX)
-
-
 $(clang_2nd_arch_prefix)RS_TRIPLE := armv7-linux-androideabi
 $(clang_2nd_arch_prefix)RS_TRIPLE_CFLAGS := -D__i386__
 $(clang_2nd_arch_prefix)RS_COMPAT_TRIPLE := i686-linux-android
@@ -50,5 +5,4 @@ $(clang_2nd_arch_prefix)RS_COMPAT_TRIPLE := i686-linux-android
 $(clang_2nd_arch_prefix)TARGET_LIBPROFILE_RT := $(LLVM_RTLIB_PATH)/libclang_rt.profile-i686-android.a
 
 # Address sanitizer clang config
-$(clang_2nd_arch_prefix)ADDRESS_SANITIZER_RUNTIME_LIBRARY := libclang_rt.asan-i686-android
 $(clang_2nd_arch_prefix)ADDRESS_SANITIZER_LINKER := /system/bin/linker_asan
diff --git a/core/clang/TARGET_x86_64.mk b/core/clang/TARGET_x86_64.mk
index e57aaf843b..0d615f2904 100644
--- a/core/clang/TARGET_x86_64.mk
+++ b/core/clang/TARGET_x86_64.mk
@@ -1,41 +1,3 @@
-
-include $(BUILD_SYSTEM)/clang/x86_64.mk
-
-CLANG_CONFIG_x86_64_TARGET_TRIPLE := x86_64-linux-android
-CLANG_CONFIG_x86_64_TARGET_TOOLCHAIN_PREFIX := \
-  $(TARGET_TOOLCHAIN_ROOT)/$(CLANG_CONFIG_x86_64_TARGET_TRIPLE)/bin
-
-CLANG_CONFIG_x86_64_TARGET_EXTRA_ASFLAGS := \
-  $(CLANG_CONFIG_EXTRA_ASFLAGS) \
-  $(CLANG_CONFIG_TARGET_EXTRA_ASFLAGS) \
-  $(CLANG_CONFIG_x86_64_EXTRA_ASFLAGS) \
-  -target $(CLANG_CONFIG_x86_64_TARGET_TRIPLE) \
-  -B$(CLANG_CONFIG_x86_64_TARGET_TOOLCHAIN_PREFIX)
-
-CLANG_CONFIG_x86_64_TARGET_EXTRA_CFLAGS := \
-  $(CLANG_CONFIG_EXTRA_CFLAGS) \
-  $(CLANG_CONFIG_TARGET_EXTRA_CFLAGS) \
-  $(CLANG_CONFIG_x86_64_EXTRA_CFLAGS) \
-  $(CLANG_CONFIG_x86_64_TARGET_EXTRA_ASFLAGS)
-
-CLANG_CONFIG_x86_64_TARGET_EXTRA_CONLYFLAGS := \
-  $(CLANG_CONFIG_EXTRA_CONLYFLAGS) \
-  $(CLANG_CONFIG_TARGET_EXTRA_CONLYFLAGS) \
-  $(CLANG_CONFIG_x86_64_EXTRA_CONLYFLAGS)
-
-CLANG_CONFIG_x86_64_TARGET_EXTRA_CPPFLAGS := \
-  $(CLANG_CONFIG_EXTRA_CPPFLAGS) \
-  $(CLANG_CONFIG_TARGET_EXTRA_CPPFLAGS) \
-  $(CLANG_CONFIG_x86_64_EXTRA_CPPFLAGS) \
-
-CLANG_CONFIG_x86_64_TARGET_EXTRA_LDFLAGS := \
-  $(CLANG_CONFIG_EXTRA_LDFLAGS) \
-  $(CLANG_CONFIG_TARGET_EXTRA_LDFLAGS) \
-  $(CLANG_CONFIG_x86_64_EXTRA_LDFLAGS) \
-  -target $(CLANG_CONFIG_x86_64_TARGET_TRIPLE) \
-  -B$(CLANG_CONFIG_x86_64_TARGET_TOOLCHAIN_PREFIX)
-
-
 RS_TRIPLE := aarch64-linux-android
 RS_TRIPLE_CFLAGS := -D__x86_64__
 RS_COMPAT_TRIPLE := x86_64-linux-android
diff --git a/core/clang/arm.mk b/core/clang/arm.mk
deleted file mode 100644
index f8f9632c43..0000000000
--- a/core/clang/arm.mk
+++ /dev/null
@@ -1,15 +0,0 @@
-# Clang flags for arm arch, target or host.
-
-CLANG_CONFIG_arm_EXTRA_ASFLAGS :=
-
-CLANG_CONFIG_arm_EXTRA_CFLAGS :=
-
-CLANG_CONFIG_arm_EXTRA_CPPFLAGS :=
-
-CLANG_CONFIG_arm_EXTRA_LDFLAGS :=
-
-ifneq (,$(filter krait,$(TARGET_$(combo_2nd_arch_prefix)CPU_VARIANT)))
-  # Android's clang support's krait as a CPU whereas GCC doesn't. Specify
-  # -mcpu here rather than the more normal core/combo/arch/arm/armv7-a-neon.mk.
-  CLANG_CONFIG_arm_EXTRA_CFLAGS += -mcpu=krait -mfpu=neon-vfpv4
-endif
diff --git a/core/clang/arm64.mk b/core/clang/arm64.mk
deleted file mode 100644
index 94b17f59e8..0000000000
--- a/core/clang/arm64.mk
+++ /dev/null
@@ -1,7 +0,0 @@
-# Clang flags for arm64 arch, target or host.
-
-CLANG_CONFIG_arm64_EXTRA_ASFLAGS :=
-
-CLANG_CONFIG_arm64_EXTRA_CFLAGS :=
-
-CLANG_CONFIG_arm64_EXTRA_LDFLAGS :=
diff --git a/core/clang/config.mk b/core/clang/config.mk
index ccfd0f2fee..a269839df0 100644
--- a/core/clang/config.mk
+++ b/core/clang/config.mk
@@ -16,48 +16,6 @@ RS_CLANG := $(RS_LLVM_PREBUILTS_PATH)/clang$(BUILD_EXECUTABLE_SUFFIX)
 RS_LLVM_AS := $(RS_LLVM_PREBUILTS_PATH)/llvm-as$(BUILD_EXECUTABLE_SUFFIX)
 RS_LLVM_LINK := $(RS_LLVM_PREBUILTS_PATH)/llvm-link$(BUILD_EXECUTABLE_SUFFIX)
 
-# Clang flags for all host or target rules
-CLANG_CONFIG_EXTRA_ASFLAGS :=
-CLANG_CONFIG_EXTRA_CFLAGS :=
-CLANG_CONFIG_EXTRA_CONLYFLAGS := -std=gnu99
-CLANG_CONFIG_EXTRA_CPPFLAGS :=
-CLANG_CONFIG_EXTRA_LDFLAGS :=
-
-CLANG_CONFIG_EXTRA_CFLAGS += \
-  -D__compiler_offsetof=__builtin_offsetof
-
-# Help catch common 32/64-bit errors.
-CLANG_CONFIG_EXTRA_CFLAGS += \
-  -Werror=int-conversion
-
-# Disable overly aggressive warning for macros defined with a leading underscore
-# This used to happen in AndroidConfig.h, which was included everywhere.
-# TODO: can we remove this now?
-CLANG_CONFIG_EXTRA_CFLAGS += \
-  -Wno-reserved-id-macro
-
-# Disable overly aggressive warning for format strings.
-# Bug: 20148343
-CLANG_CONFIG_EXTRA_CFLAGS += \
-  -Wno-format-pedantic
-
-# Workaround for ccache with clang.
-# See http://petereisentraut.blogspot.com/2011/05/ccache-and-clang.html.
-CLANG_CONFIG_EXTRA_CFLAGS += \
-  -Wno-unused-command-line-argument
-
-# Disable -Winconsistent-missing-override until we can clean up the existing
-# codebase for it.
-CLANG_CONFIG_EXTRA_CPPFLAGS += \
-  -Wno-inconsistent-missing-override
-
-# Force clang to always output color diagnostics.  Ninja will strip the ANSI
-# color codes if it is not running in a terminal.
-ifdef BUILDING_WITH_NINJA
-CLANG_CONFIG_EXTRA_CFLAGS += \
-  -fcolor-diagnostics
-endif
-
 CLANG_CONFIG_UNKNOWN_CFLAGS := \
   -finline-functions \
   -finline-limit=64 \
@@ -110,24 +68,6 @@ define convert-to-clang-flags
 $(strip $(filter-out $(CLANG_CONFIG_UNKNOWN_CFLAGS),$(1)))
 endef
 
-# Clang flags for all host rules
-CLANG_CONFIG_HOST_EXTRA_ASFLAGS :=
-CLANG_CONFIG_HOST_EXTRA_CFLAGS :=
-CLANG_CONFIG_HOST_EXTRA_CPPFLAGS :=
-CLANG_CONFIG_HOST_EXTRA_LDFLAGS :=
-
-# Clang flags for all host cross rules
-CLANG_CONFIG_HOST_CROSS_EXTRA_ASFLAGS :=
-CLANG_CONFIG_HOST_CROSS_EXTRA_CFLAGS :=
-CLANG_CONFIG_HOST_CROSS_EXTRA_CPPFLAGS :=
-CLANG_CONFIG_HOST_CROSS_EXTRA_LDFLAGS :=
-
-# Clang flags for all target rules
-CLANG_CONFIG_TARGET_EXTRA_ASFLAGS :=
-CLANG_CONFIG_TARGET_EXTRA_CFLAGS := -nostdlibinc
-CLANG_CONFIG_TARGET_EXTRA_CPPFLAGS :=
-CLANG_CONFIG_TARGET_EXTRA_LDFLAGS :=
-
 CLANG_DEFAULT_UB_CHECKS := \
   bool \
   integer-divide-by-zero \
diff --git a/core/clang/mips.mk b/core/clang/mips.mk
deleted file mode 100644
index f5238c903a..0000000000
--- a/core/clang/mips.mk
+++ /dev/null
@@ -1,5 +0,0 @@
-# Clang flags for mips arch, target or host.
-
-CLANG_CONFIG_mips_EXTRA_ASFLAGS :=
-CLANG_CONFIG_mips_EXTRA_CFLAGS :=
-CLANG_CONFIG_mips_EXTRA_LDFLAGS :=
diff --git a/core/clang/mips64.mk b/core/clang/mips64.mk
deleted file mode 100644
index 4c410d3378..0000000000
--- a/core/clang/mips64.mk
+++ /dev/null
@@ -1,5 +0,0 @@
-# Clang flags for mips64 arch, target or host.
-
-CLANG_CONFIG_mips64_EXTRA_ASFLAGS :=
-CLANG_CONFIG_mips64_EXTRA_CFLAGS :=
-CLANG_CONFIG_mips64_EXTRA_LDFLAGS :=
diff --git a/core/clang/x86.mk b/core/clang/x86.mk
deleted file mode 100644
index f588209e85..0000000000
--- a/core/clang/x86.mk
+++ /dev/null
@@ -1,6 +0,0 @@
-# Clang flags for x86 arch, target or host.
-
-CLANG_CONFIG_x86_EXTRA_ASFLAGS := \
-  -msse3
-CLANG_CONFIG_x86_EXTRA_CFLAGS :=
-CLANG_CONFIG_x86_EXTRA_LDFLAGS :=
diff --git a/core/clang/x86_64.mk b/core/clang/x86_64.mk
deleted file mode 100644
index c8f1f6ebe6..0000000000
--- a/core/clang/x86_64.mk
+++ /dev/null
@@ -1,5 +0,0 @@
-# Clang flags for x86_64 arch, target or host.
-
-CLANG_CONFIG_x86_64_EXTRA_ASFLAGS :=
-CLANG_CONFIG_x86_64_EXTRA_CFLAGS :=
-CLANG_CONFIG_x86_64_EXTRA_LDFLAGS :=
diff --git a/core/combo/HOST_CROSS_windows-x86.mk b/core/combo/HOST_CROSS_windows-x86.mk
index 5328982e83..d924901604 100644
--- a/core/combo/HOST_CROSS_windows-x86.mk
+++ b/core/combo/HOST_CROSS_windows-x86.mk
@@ -17,18 +17,7 @@
 # Settings to use MinGW as a cross-compiler under Linux
 # Included by combo/select.make
 
-$(combo_var_prefix)C_INCLUDES += prebuilts/gcc/linux-x86/host/x86_64-w64-mingw32-4.8/x86_64-w64-mingw32/include
-$(combo_var_prefix)C_INCLUDES += prebuilts/gcc/linux-x86/host/x86_64-w64-mingw32-4.8/lib/gcc/x86_64-w64-mingw32/4.8.3/include
-
 define $(combo_var_prefix)transform-shared-lib-to-toc
 $(hide) $($(PRIVATE_2ND_ARCH_VAR_PREFIX)$(PRIVATE_PREFIX)OBJDUMP) -x $(1) | grep "^Name" | cut -f3 -d" " > $(2)
 $(hide) $($(PRIVATE_2ND_ARCH_VAR_PREFIX)$(PRIVATE_PREFIX)NM) -g -f p $(1) | cut -f1-2 -d" " >> $(2)
 endef
-
-$(combo_var_prefix)SHLIB_SUFFIX := .dll
-$(combo_var_prefix)EXECUTABLE_SUFFIX := .exe
-
-$(combo_var_prefix)IS_64_BIT :=
-
-# The mingw gcc is 4.8, 4.9 is required for color diagnostics
-$(combo_var_prefix)UNKNOWN_CFLAGS := -fdiagnostics-color
diff --git a/core/combo/HOST_CROSS_windows-x86_64.mk b/core/combo/HOST_CROSS_windows-x86_64.mk
index b8101f4241..d924901604 100644
--- a/core/combo/HOST_CROSS_windows-x86_64.mk
+++ b/core/combo/HOST_CROSS_windows-x86_64.mk
@@ -17,18 +17,7 @@
 # Settings to use MinGW as a cross-compiler under Linux
 # Included by combo/select.make
 
-$(combo_var_prefix)C_INCLUDES += prebuilts/gcc/linux-x86/host/x86_64-w64-mingw32-4.8/x86_64-w64-mingw32/include
-$(combo_var_prefix)C_INCLUDES += prebuilts/gcc/linux-x86/host/x86_64-w64-mingw32-4.8/lib/gcc/x86_64-w64-mingw32/4.8.3/include
-
 define $(combo_var_prefix)transform-shared-lib-to-toc
 $(hide) $($(PRIVATE_2ND_ARCH_VAR_PREFIX)$(PRIVATE_PREFIX)OBJDUMP) -x $(1) | grep "^Name" | cut -f3 -d" " > $(2)
 $(hide) $($(PRIVATE_2ND_ARCH_VAR_PREFIX)$(PRIVATE_PREFIX)NM) -g -f p $(1) | cut -f1-2 -d" " >> $(2)
 endef
-
-$(combo_var_prefix)SHLIB_SUFFIX := .dll
-$(combo_var_prefix)EXECUTABLE_SUFFIX := .exe
-
-$(combo_var_prefix)IS_64_BIT := true
-
-# The mingw gcc is 4.8, 4.9 is required for color diagnostics
-$(combo_var_prefix)UNKNOWN_CFLAGS := -fdiagnostics-color
diff --git a/core/combo/HOST_darwin-x86.mk b/core/combo/HOST_darwin-x86.mk
index 7c688da427..9e1ecc5bac 100644
--- a/core/combo/HOST_darwin-x86.mk
+++ b/core/combo/HOST_darwin-x86.mk
@@ -17,21 +17,12 @@
 # Configuration for Darwin (Mac OS X) on x86.
 # Included by combo/select.mk
 
-include $(BUILD_COMBOS)/mac_version.mk
-
 define $(combo_var_prefix)transform-shared-lib-to-toc
 $(call _gen_toc_command_for_macho,$(1),$(2))
 endef
 
-$(combo_2nd_arch_prefix)HOST_SHLIB_SUFFIX := .dylib
-$(combo_2nd_arch_prefix)HOST_JNILIB_SUFFIX := .jnilib
-
 $(combo_2nd_arch_prefix)HOST_GLOBAL_ARFLAGS := cqs
 
-# Use Darwin's libc++, as Darwin's libstdc++ is old and does not support C++11
-$(combo_2nd_arch_prefix)HOST_SYSTEMCPP_CPPFLAGS := -isystem $(mac_sdk_path)/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1
-$(combo_2nd_arch_prefix)HOST_SYSTEMCPP_LDFLAGS := -stdlib=libc++
-
 ############################################################
 ## Macros after this line are shared by the 64-bit config.
 
diff --git a/core/combo/HOST_darwin-x86_64.mk b/core/combo/HOST_darwin-x86_64.mk
index e61933e20e..6cca167e48 100644
--- a/core/combo/HOST_darwin-x86_64.mk
+++ b/core/combo/HOST_darwin-x86_64.mk
@@ -17,21 +17,12 @@
 # Configuration for Darwin (Mac OS X) on x86_64.
 # Included by combo/select.mk
 
-include $(BUILD_COMBOS)/mac_version.mk
-
 define $(combo_var_prefix)transform-shared-lib-to-toc
 $(call _gen_toc_command_for_macho,$(1),$(2))
 endef
 
-HOST_SHLIB_SUFFIX := .dylib
-HOST_JNILIB_SUFFIX := .jnilib
-
 HOST_GLOBAL_ARFLAGS := cqs
 
-# Use Darwin's libc++, as Darwin's libstdc++ is old and does not support C++11
-HOST_SYSTEMCPP_CPPFLAGS := -isystem $(mac_sdk_path)/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1
-HOST_SYSTEMCPP_LDFLAGS := -stdlib=libc++
-
 # We Reuse the following functions with the same name from HOST_darwin-x86.mk:
 # transform-host-o-to-shared-lib-inner
 # transform-host-o-to-executable-inner
diff --git a/core/combo/HOST_linux-x86.mk b/core/combo/HOST_linux-x86.mk
index 253bac0f44..4e83dc4c0b 100644
--- a/core/combo/HOST_linux-x86.mk
+++ b/core/combo/HOST_linux-x86.mk
@@ -21,9 +21,6 @@ define $(combo_var_prefix)transform-shared-lib-to-toc
 $(call _gen_toc_command_for_elf,$(1),$(2))
 endef
 
-# gcc location for clang; to be updated when clang is updated
-$(combo_2nd_arch_prefix)HOST_TOOLCHAIN_FOR_CLANG := prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.15-4.8
-
 ############################################################
 ## Macros after this line are shared by the 64-bit config.
 
diff --git a/core/combo/HOST_linux-x86_64.mk b/core/combo/HOST_linux-x86_64.mk
index 68acaff559..845733f74d 100644
--- a/core/combo/HOST_linux-x86_64.mk
+++ b/core/combo/HOST_linux-x86_64.mk
@@ -20,6 +20,3 @@
 define $(combo_var_prefix)transform-shared-lib-to-toc
 $(call _gen_toc_command_for_elf,$(1),$(2))
 endef
-
-# gcc location for clang; to be updated when clang is updated
-HOST_TOOLCHAIN_FOR_CLANG := prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.15-4.8
diff --git a/core/combo/TARGET_linux-arm.mk b/core/combo/TARGET_linux-arm.mk
index f08e088c5e..2e179f6edd 100644
--- a/core/combo/TARGET_linux-arm.mk
+++ b/core/combo/TARGET_linux-arm.mk
@@ -33,11 +33,6 @@ ifeq ($(strip $(TARGET_$(combo_2nd_arch_prefix)ARCH_VARIANT)),)
 TARGET_$(combo_2nd_arch_prefix)ARCH_VARIANT := armv5te
 endif
 
-# Decouple NDK library selection with platform compiler version
-$(combo_2nd_arch_prefix)TARGET_NDK_GCC_VERSION := 4.9
-
-$(combo_2nd_arch_prefix)TARGET_GCC_VERSION := 4.9
-
 TARGET_ARCH_SPECIFIC_MAKEFILE := $(BUILD_COMBOS)/arch/$(TARGET_$(combo_2nd_arch_prefix)ARCH)/$(TARGET_$(combo_2nd_arch_prefix)ARCH_VARIANT).mk
 ifeq ($(strip $(wildcard $(TARGET_ARCH_SPECIFIC_MAKEFILE))),)
 $(error Unknown ARM architecture version: $(TARGET_$(combo_2nd_arch_prefix)ARCH_VARIANT))
@@ -46,65 +41,10 @@ endif
 include $(TARGET_ARCH_SPECIFIC_MAKEFILE)
 include $(BUILD_SYSTEM)/combo/fdo.mk
 
-$(combo_2nd_arch_prefix)TARGET_TOOLCHAIN_ROOT := prebuilts/gcc/$(HOST_PREBUILT_TAG)/arm/arm-linux-androideabi-$($(combo_2nd_arch_prefix)TARGET_GCC_VERSION)
-
 define $(combo_var_prefix)transform-shared-lib-to-toc
 $(call _gen_toc_command_for_elf,$(1),$(2))
 endef
 
-$(combo_2nd_arch_prefix)TARGET_arm_CFLAGS :=    -O2 \
-                        -fomit-frame-pointer \
-                        -fstrict-aliasing    \
-                        -funswitch-loops
-
-# Modules can choose to compile some source as thumb.
-$(combo_2nd_arch_prefix)TARGET_thumb_CFLAGS :=  -mthumb \
-                        -Os \
-                        -fomit-frame-pointer \
-                        -fno-strict-aliasing
-
-# Set FORCE_ARM_DEBUGGING to "true" in your buildspec.mk
-# or in your environment to force a full arm build, even for
-# files that are normally built as thumb; this can make
-# gdb debugging easier.  Don't forget to do a clean build.
-#
-# NOTE: if you try to build a -O0 build with thumb, several
-# of the libraries (libpv, libwebcore, libkjs) need to be built
-# with -mlong-calls.  When built at -O0, those libraries are
-# too big for a thumb "BL <label>" to go from one end to the other.
-ifeq ($(FORCE_ARM_DEBUGGING),true)
-  $(combo_2nd_arch_prefix)TARGET_arm_CFLAGS += -fno-omit-frame-pointer -fno-strict-aliasing
-  $(combo_2nd_arch_prefix)TARGET_thumb_CFLAGS += -marm -fno-omit-frame-pointer
-endif
-
-# More flags/options can be added here
-$(combo_2nd_arch_prefix)TARGET_RELEASE_CFLAGS := \
-			-DNDEBUG \
-			-g \
-			-Wstrict-aliasing=2 \
-			-fgcse-after-reload \
-			-frerun-cse-after-loop \
-			-frename-registers
-
-libc_root := bionic/libc
-
-KERNEL_HEADERS_COMMON := $(libc_root)/kernel/uapi
-KERNEL_HEADERS_COMMON += $(libc_root)/kernel/common
-KERNEL_HEADERS_ARCH   := $(libc_root)/kernel/uapi/asm-$(TARGET_$(combo_2nd_arch_prefix)ARCH)
-KERNEL_HEADERS := $(KERNEL_HEADERS_COMMON) $(KERNEL_HEADERS_ARCH)
-
-$(combo_2nd_arch_prefix)TARGET_C_INCLUDES := \
-	$(libc_root)/arch-arm/include \
-	$(libc_root)/include \
-	$(KERNEL_HEADERS)
-
-$(combo_2nd_arch_prefix)TARGET_CRTBEGIN_STATIC_O := $($(combo_2nd_arch_prefix)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_static.o
-$(combo_2nd_arch_prefix)TARGET_CRTBEGIN_DYNAMIC_O := $($(combo_2nd_arch_prefix)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_dynamic.o
-$(combo_2nd_arch_prefix)TARGET_CRTEND_O := $($(combo_2nd_arch_prefix)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtend_android.o
-
-$(combo_2nd_arch_prefix)TARGET_CRTBEGIN_SO_O := $($(combo_2nd_arch_prefix)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_so.o
-$(combo_2nd_arch_prefix)TARGET_CRTEND_SO_O := $($(combo_2nd_arch_prefix)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtend_so.o
-
 $(combo_2nd_arch_prefix)TARGET_PACK_MODULE_RELOCATIONS := true
 
 $(combo_2nd_arch_prefix)TARGET_LINKER := /system/bin/linker
diff --git a/core/combo/TARGET_linux-arm64.mk b/core/combo/TARGET_linux-arm64.mk
index b07ea23668..a3f59a774c 100644
--- a/core/combo/TARGET_linux-arm64.mk
+++ b/core/combo/TARGET_linux-arm64.mk
@@ -33,11 +33,6 @@ ifeq ($(strip $(TARGET_ARCH_VARIANT)),)
 TARGET_ARCH_VARIANT := armv8
 endif
 
-# Decouple NDK library selection with platform compiler version
-TARGET_NDK_GCC_VERSION := 4.9
-
-TARGET_GCC_VERSION := 4.9
-
 TARGET_ARCH_SPECIFIC_MAKEFILE := $(BUILD_COMBOS)/arch/$(TARGET_ARCH)/$(TARGET_ARCH_VARIANT).mk
 ifeq ($(strip $(wildcard $(TARGET_ARCH_SPECIFIC_MAKEFILE))),)
 $(error Unknown ARM architecture version: $(TARGET_ARCH_VARIANT))
@@ -46,40 +41,10 @@ endif
 include $(TARGET_ARCH_SPECIFIC_MAKEFILE)
 include $(BUILD_SYSTEM)/combo/fdo.mk
 
-TARGET_TOOLCHAIN_ROOT := prebuilts/gcc/$(HOST_PREBUILT_TAG)/aarch64/aarch64-linux-android-$(TARGET_GCC_VERSION)
-
 define $(combo_var_prefix)transform-shared-lib-to-toc
 $(call _gen_toc_command_for_elf,$(1),$(2))
 endef
 
-# More flags/options can be added here
-TARGET_RELEASE_CFLAGS := \
-			-DNDEBUG \
-			-O2 -g \
-			-Wstrict-aliasing=2 \
-			-fgcse-after-reload \
-			-frerun-cse-after-loop \
-			-frename-registers
-
-libc_root := bionic/libc
-
-KERNEL_HEADERS_COMMON := $(libc_root)/kernel/uapi
-KERNEL_HEADERS_COMMON += $(libc_root)/kernel/common
-KERNEL_HEADERS_ARCH   := $(libc_root)/kernel/uapi/asm-$(TARGET_ARCH)
-KERNEL_HEADERS := $(KERNEL_HEADERS_COMMON) $(KERNEL_HEADERS_ARCH)
-
-TARGET_C_INCLUDES := \
-	$(libc_root)/arch-arm64/include \
-	$(libc_root)/include \
-	$(KERNEL_HEADERS)
-
-TARGET_CRTBEGIN_STATIC_O := $(TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_static.o
-TARGET_CRTBEGIN_DYNAMIC_O := $(TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_dynamic.o
-TARGET_CRTEND_O := $(TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtend_android.o
-
-TARGET_CRTBEGIN_SO_O := $(TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_so.o
-TARGET_CRTEND_SO_O := $(TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtend_so.o
-
 TARGET_PACK_MODULE_RELOCATIONS := true
 
 TARGET_LINKER := /system/bin/linker64
diff --git a/core/combo/TARGET_linux-mips.mk b/core/combo/TARGET_linux-mips.mk
index 4d876a61a8..ba76969d8a 100644
--- a/core/combo/TARGET_linux-mips.mk
+++ b/core/combo/TARGET_linux-mips.mk
@@ -33,11 +33,6 @@ ifeq ($(strip $(TARGET_$(combo_2nd_arch_prefix)ARCH_VARIANT)),)
 TARGET_$(combo_2nd_arch_prefix)ARCH_VARIANT := mips32r2-fp
 endif
 
-# Decouple NDK library selection with platform compiler version
-$(combo_2nd_arch_prefix)TARGET_NDK_GCC_VERSION := 4.9
-
-$(combo_2nd_arch_prefix)TARGET_GCC_VERSION := 4.9
-
 TARGET_ARCH_SPECIFIC_MAKEFILE := $(BUILD_COMBOS)/arch/$(TARGET_$(combo_2nd_arch_prefix)ARCH)/$(TARGET_$(combo_2nd_arch_prefix)ARCH_VARIANT).mk
 ifeq ($(strip $(wildcard $(TARGET_ARCH_SPECIFIC_MAKEFILE))),)
 $(error Unknown MIPS architecture variant: $(TARGET_$(combo_2nd_arch_prefix)ARCH_VARIANT))
@@ -46,52 +41,10 @@ endif
 include $(TARGET_ARCH_SPECIFIC_MAKEFILE)
 include $(BUILD_SYSTEM)/combo/fdo.mk
 
-$(combo_2nd_arch_prefix)TARGET_TOOLCHAIN_ROOT := prebuilts/gcc/$(HOST_PREBUILT_TAG)/mips/mips64el-linux-android-$($(combo_2nd_arch_prefix)TARGET_GCC_VERSION)
-
 define $(combo_var_prefix)transform-shared-lib-to-toc
 $(call _gen_toc_command_for_elf,$(1),$(2))
 endef
 
-TARGET_mips_CFLAGS :=	-O2 \
-			-fomit-frame-pointer \
-			-fno-strict-aliasing    \
-			-funswitch-loops
-
-# Set FORCE_MIPS_DEBUGGING to "true" in your buildspec.mk
-# or in your environment to gdb debugging easier.
-# Don't forget to do a clean build.
-ifeq ($(FORCE_MIPS_DEBUGGING),true)
-  TARGET_mips_CFLAGS += -fno-omit-frame-pointer
-endif
-
-# More flags/options can be added here
-$(combo_2nd_arch_prefix)TARGET_RELEASE_CFLAGS := \
-			-DNDEBUG \
-			-g \
-			-Wstrict-aliasing=2 \
-			-fgcse-after-reload \
-			-frerun-cse-after-loop \
-			-frename-registers
-
-libc_root := bionic/libc
-
-KERNEL_HEADERS_COMMON := $(libc_root)/kernel/uapi
-KERNEL_HEADERS_COMMON += $(libc_root)/kernel/common
-KERNEL_HEADERS_ARCH   := $(libc_root)/kernel/uapi/asm-mips # mips covers both mips and mips64.
-KERNEL_HEADERS := $(KERNEL_HEADERS_COMMON) $(KERNEL_HEADERS_ARCH)
-
-$(combo_2nd_arch_prefix)TARGET_C_INCLUDES := \
-	$(libc_root)/arch-mips/include \
-	$(libc_root)/include \
-	$(KERNEL_HEADERS)
-
-$(combo_2nd_arch_prefix)TARGET_CRTBEGIN_STATIC_O := $($(combo_2nd_arch_prefix)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_static.o
-$(combo_2nd_arch_prefix)TARGET_CRTBEGIN_DYNAMIC_O := $($(combo_2nd_arch_prefix)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_dynamic.o
-$(combo_2nd_arch_prefix)TARGET_CRTEND_O := $($(combo_2nd_arch_prefix)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtend_android.o
-
-$(combo_2nd_arch_prefix)TARGET_CRTBEGIN_SO_O := $($(combo_2nd_arch_prefix)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_so.o
-$(combo_2nd_arch_prefix)TARGET_CRTEND_SO_O := $($(combo_2nd_arch_prefix)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtend_so.o
-
 $(combo_2nd_arch_prefix)TARGET_PACK_MODULE_RELOCATIONS := true
 
 $(combo_2nd_arch_prefix)TARGET_LINKER := /system/bin/linker
diff --git a/core/combo/TARGET_linux-mips64.mk b/core/combo/TARGET_linux-mips64.mk
index 4d77d971f4..b498d1f25c 100644
--- a/core/combo/TARGET_linux-mips64.mk
+++ b/core/combo/TARGET_linux-mips64.mk
@@ -33,11 +33,6 @@ ifeq ($(strip $(TARGET_ARCH_VARIANT)),)
 TARGET_ARCH_VARIANT := mips64r6
 endif
 
-# Decouple NDK library selection with platform compiler version
-TARGET_NDK_GCC_VERSION := 4.9
-
-TARGET_GCC_VERSION := 4.9
-
 TARGET_ARCH_SPECIFIC_MAKEFILE := $(BUILD_COMBOS)/arch/$(TARGET_ARCH)/$(TARGET_ARCH_VARIANT).mk
 ifeq ($(strip $(wildcard $(TARGET_ARCH_SPECIFIC_MAKEFILE))),)
 $(error Unknown MIPS architecture variant: $(TARGET_ARCH_VARIANT))
@@ -46,53 +41,10 @@ endif
 include $(TARGET_ARCH_SPECIFIC_MAKEFILE)
 include $(BUILD_SYSTEM)/combo/fdo.mk
 
-TARGET_TOOLCHAIN_ROOT := prebuilts/gcc/$(HOST_PREBUILT_TAG)/mips/mips64el-linux-android-$(TARGET_GCC_VERSION)
-
 define $(combo_var_prefix)transform-shared-lib-to-toc
 $(call _gen_toc_command_for_elf,$(1),$(2))
 endef
 
-TARGET_mips_CFLAGS :=	-O2 \
-			-fomit-frame-pointer \
-			-fno-strict-aliasing    \
-			-funswitch-loops
-
-# Set FORCE_MIPS_DEBUGGING to "true" in your buildspec.mk
-# or in your environment to gdb debugging easier.
-# Don't forget to do a clean build.
-ifeq ($(FORCE_MIPS_DEBUGGING),true)
-  TARGET_mips_CFLAGS += -fno-omit-frame-pointer
-endif
-
-# More flags/options can be added here
-TARGET_RELEASE_CFLAGS := \
-			-DNDEBUG \
-			-g \
-			-Wstrict-aliasing=2 \
-			-fgcse-after-reload \
-			-frerun-cse-after-loop \
-			-frename-registers
-
-libc_root := bionic/libc
-
-KERNEL_HEADERS_COMMON := $(libc_root)/kernel/uapi
-KERNEL_HEADERS_COMMON += $(libc_root)/kernel/common
-KERNEL_HEADERS_ARCH   := $(libc_root)/kernel/uapi/asm-mips
-# TODO: perhaps use $(libc_root)/kernel/uapi/asm-$(TARGET_ARCH) instead of asm-mips ?
-KERNEL_HEADERS := $(KERNEL_HEADERS_COMMON) $(KERNEL_HEADERS_ARCH)
-
-TARGET_C_INCLUDES := \
-	$(libc_root)/arch-mips64/include \
-	$(libc_root)/include \
-	$(KERNEL_HEADERS)
-
-TARGET_CRTBEGIN_STATIC_O := $(TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_static.o
-TARGET_CRTBEGIN_DYNAMIC_O := $(TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_dynamic.o
-TARGET_CRTEND_O := $(TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtend_android.o
-
-TARGET_CRTBEGIN_SO_O := $(TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_so.o
-TARGET_CRTEND_SO_O := $(TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtend_so.o
-
 TARGET_PACK_MODULE_RELOCATIONS := true
 
 TARGET_LINKER := /system/bin/linker64
diff --git a/core/combo/TARGET_linux-x86.mk b/core/combo/TARGET_linux-x86.mk
index d1d6a319dd..2c4614b6cd 100644
--- a/core/combo/TARGET_linux-x86.mk
+++ b/core/combo/TARGET_linux-x86.mk
@@ -22,11 +22,6 @@ ifeq ($(strip $(TARGET_$(combo_2nd_arch_prefix)ARCH_VARIANT)),)
 TARGET_$(combo_2nd_arch_prefix)ARCH_VARIANT := x86
 endif
 
-# Decouple NDK library selection with platform compiler version
-$(combo_2nd_arch_prefix)TARGET_NDK_GCC_VERSION := 4.9
-
-$(combo_2nd_arch_prefix)TARGET_GCC_VERSION := 4.9
-
 # Include the arch-variant-specific configuration file.
 # Its role is to define various ARCH_X86_HAVE_XXX feature macros,
 # plus initial values for TARGET_GLOBAL_CFLAGS
@@ -39,31 +34,10 @@ endif
 include $(TARGET_ARCH_SPECIFIC_MAKEFILE)
 include $(BUILD_SYSTEM)/combo/fdo.mk
 
-$(combo_2nd_arch_prefix)TARGET_TOOLCHAIN_ROOT := prebuilts/gcc/$(HOST_PREBUILT_TAG)/x86/x86_64-linux-android-$($(combo_2nd_arch_prefix)TARGET_GCC_VERSION)
-
 define $(combo_var_prefix)transform-shared-lib-to-toc
 $(call _gen_toc_command_for_elf,$(1),$(2))
 endef
 
-libc_root := bionic/libc
-
-KERNEL_HEADERS_COMMON := $(libc_root)/kernel/uapi
-KERNEL_HEADERS_COMMON += $(libc_root)/kernel/common
-KERNEL_HEADERS_ARCH   := $(libc_root)/kernel/uapi/asm-x86 # x86 covers both x86 and x86_64.
-KERNEL_HEADERS := $(KERNEL_HEADERS_COMMON) $(KERNEL_HEADERS_ARCH)
-
-$(combo_2nd_arch_prefix)TARGET_C_INCLUDES := \
-	$(libc_root)/arch-x86/include \
-	$(libc_root)/include \
-	$(KERNEL_HEADERS)
-
-$(combo_2nd_arch_prefix)TARGET_CRTBEGIN_STATIC_O := $($(combo_2nd_arch_prefix)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_static.o
-$(combo_2nd_arch_prefix)TARGET_CRTBEGIN_DYNAMIC_O := $($(combo_2nd_arch_prefix)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_dynamic.o
-$(combo_2nd_arch_prefix)TARGET_CRTEND_O := $($(combo_2nd_arch_prefix)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtend_android.o
-
-$(combo_2nd_arch_prefix)TARGET_CRTBEGIN_SO_O := $($(combo_2nd_arch_prefix)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_so.o
-$(combo_2nd_arch_prefix)TARGET_CRTEND_SO_O := $($(combo_2nd_arch_prefix)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtend_so.o
-
 $(combo_2nd_arch_prefix)TARGET_PACK_MODULE_RELOCATIONS := true
 
 $(combo_2nd_arch_prefix)TARGET_LINKER := /system/bin/linker
diff --git a/core/combo/TARGET_linux-x86_64.mk b/core/combo/TARGET_linux-x86_64.mk
index 350ad48399..d2172d601e 100644
--- a/core/combo/TARGET_linux-x86_64.mk
+++ b/core/combo/TARGET_linux-x86_64.mk
@@ -22,11 +22,6 @@ ifeq ($(strip $(TARGET_ARCH_VARIANT)),)
 TARGET_ARCH_VARIANT := x86_64
 endif
 
-# Decouple NDK library selection with platform compiler version
-TARGET_NDK_GCC_VERSION := 4.9
-
-TARGET_GCC_VERSION := 4.9
-
 # Include the arch-variant-specific configuration file.
 # Its role is to define various ARCH_X86_HAVE_XXX feature macros,
 # plus initial values for TARGET_GLOBAL_CFLAGS
@@ -39,31 +34,10 @@ endif
 include $(TARGET_ARCH_SPECIFIC_MAKEFILE)
 include $(BUILD_SYSTEM)/combo/fdo.mk
 
-TARGET_TOOLCHAIN_ROOT := prebuilts/gcc/$(HOST_PREBUILT_TAG)/x86/x86_64-linux-android-$(TARGET_GCC_VERSION)
-
 define $(combo_var_prefix)transform-shared-lib-to-toc
 $(call _gen_toc_command_for_elf,$(1),$(2))
 endef
 
-libc_root := bionic/libc
-
-KERNEL_HEADERS_COMMON := $(libc_root)/kernel/uapi
-KERNEL_HEADERS_COMMON += $(libc_root)/kernel/common
-KERNEL_HEADERS_ARCH   := $(libc_root)/kernel/uapi/asm-x86 # x86 covers both x86 and x86_64.
-KERNEL_HEADERS := $(KERNEL_HEADERS_COMMON) $(KERNEL_HEADERS_ARCH)
-
-TARGET_C_INCLUDES := \
-	$(libc_root)/arch-x86_64/include \
-	$(libc_root)/include \
-	$(KERNEL_HEADERS)
-
-TARGET_CRTBEGIN_STATIC_O := $(TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_static.o
-TARGET_CRTBEGIN_DYNAMIC_O := $(TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_dynamic.o
-TARGET_CRTEND_O := $(TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtend_android.o
-
-TARGET_CRTBEGIN_SO_O := $(TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_so.o
-TARGET_CRTEND_SO_O := $(TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtend_so.o
-
 TARGET_LINKER := /system/bin/linker64
 
 TARGET_GLOBAL_YASM_FLAGS := -f elf64 -m amd64
diff --git a/core/combo/arch/arm/armv5te.mk b/core/combo/arch/arm/armv5te.mk
index 88e57b7264..bd75695301 100644
--- a/core/combo/arch/arm/armv5te.mk
+++ b/core/combo/arch/arm/armv5te.mk
@@ -2,14 +2,3 @@
 # Generating binaries for the ARMv5TE architecture and higher
 #
 
-# Note: Hard coding the 'tune' value here is probably not ideal,
-# and a better solution should be found in the future.
-#
-arch_variant_cflags := \
-    -march=armv5te \
-    -mtune=xscale  \
-    -D__ARM_ARCH_5__ \
-    -D__ARM_ARCH_5T__ \
-    -D__ARM_ARCH_5E__ \
-    -D__ARM_ARCH_5TE__
-
diff --git a/core/combo/arch/arm/armv7-a-neon.mk b/core/combo/arch/arm/armv7-a-neon.mk
index 5517a79a17..01d2235a00 100644
--- a/core/combo/arch/arm/armv7-a-neon.mk
+++ b/core/combo/arch/arm/armv7-a-neon.mk
@@ -5,56 +5,3 @@ ARCH_ARM_HAVE_ARMV7A            := true
 ARCH_ARM_HAVE_VFP               := true
 ARCH_ARM_HAVE_VFP_D32           := true
 ARCH_ARM_HAVE_NEON              := true
-
-local_arch_has_lpae := false
-
-ifneq (,$(filter cortex-a15 krait denver,$(TARGET_$(combo_2nd_arch_prefix)CPU_VARIANT)))
-	# TODO: krait is not a cortex-a15, we set the variant to cortex-a15 so that
-	#       hardware divide operations are generated. This should be removed and a
-	#       krait CPU variant added to GCC. For clang we specify -mcpu for krait in
-	#       core/clang/arm.mk.
-	arch_variant_cflags := -mcpu=cortex-a15
-
-	local_arch_has_lpae := true
-	arch_variant_ldflags := \
-		-Wl,--no-fix-cortex-a8
-else
-ifeq ($(strip $(TARGET_$(combo_2nd_arch_prefix)CPU_VARIANT)),cortex-a8)
-	arch_variant_cflags := -mcpu=cortex-a8
-	arch_variant_ldflags := \
-		-Wl,--fix-cortex-a8
-else
-ifneq (,$(filter cortex-a7 cortex-a53 cortex-a53.a57,$(TARGET_$(combo_2nd_arch_prefix)CPU_VARIANT)))
-	arch_variant_cflags := -mcpu=cortex-a7
-
-	local_arch_has_lpae := true
-	arch_variant_ldflags := \
-		-Wl,--no-fix-cortex-a8
-else
-ifeq ($(strip $(TARGET_$(combo_2nd_arch_prefix)CPU_VARIANT)),cortex-a9)
-	arch_variant_cflags := -march=armv7-a
-	arch_variant_ldflags := \
-		-Wl,--no-fix-cortex-a8
-else
-	arch_variant_cflags := -march=armv7-a
-	# Generic ARM might be a Cortex A8 -- better safe than sorry
-	arch_variant_ldflags := \
-		-Wl,--fix-cortex-a8
-endif
-endif
-endif
-endif
-
-ifeq (true,$(local_arch_has_lpae))
-	# Fake an ARM compiler flag as these processors support LPAE which GCC/clang
-	# don't advertise.
-	# TODO This is a hack and we need to add it for each processor that supports LPAE until some
-	# better solution comes around. See Bug 27340895
-	arch_variant_cflags += -D__ARM_FEATURE_LPAE=1
-endif
-
-local_arch_has_lpae :=
-
-arch_variant_cflags += \
-    -mfloat-abi=softfp \
-    -mfpu=neon
diff --git a/core/combo/arch/arm/armv7-a.mk b/core/combo/arch/arm/armv7-a.mk
index 4a519770f5..0c2f04d24a 100644
--- a/core/combo/arch/arm/armv7-a.mk
+++ b/core/combo/arch/arm/armv7-a.mk
@@ -3,14 +3,3 @@
 #
 ARCH_ARM_HAVE_ARMV7A            := true
 ARCH_ARM_HAVE_VFP               := true
-
-# Note: Hard coding the 'tune' value here is probably not ideal,
-# and a better solution should be found in the future.
-#
-arch_variant_cflags := \
-    -march=armv7-a \
-    -mfloat-abi=softfp \
-    -mfpu=vfpv3-d16
-
-arch_variant_ldflags := \
-	-Wl,--fix-cortex-a8
diff --git a/core/combo/arch/arm64/armv8-a.mk b/core/combo/arch/arm64/armv8-a.mk
index 5e27e5abb7..e69de29bb2 100644
--- a/core/combo/arch/arm64/armv8-a.mk
+++ b/core/combo/arch/arm64/armv8-a.mk
@@ -1,5 +0,0 @@
-ifneq (,$(filter cortex-a53,$(TARGET_$(combo_2nd_arch_prefix)CPU_VARIANT)))
-	arch_variant_cflags := -mcpu=cortex-a53
-else
-	arch_variant_cflags :=
-endif
diff --git a/core/combo/arch/mips/mips32-fp.mk b/core/combo/arch/mips/mips32-fp.mk
index 912ff631b5..4b09bc1a50 100644
--- a/core/combo/arch/mips/mips32-fp.mk
+++ b/core/combo/arch/mips/mips32-fp.mk
@@ -3,11 +3,3 @@
 
 ARCH_MIPS_HAS_FPU	:=true
 ARCH_HAVE_ALIGNED_DOUBLES :=true
-arch_variant_cflags := \
-    -mips32 \
-    -mfp32 \
-    -modd-spreg \
-    -mno-synci
-
-arch_variant_ldflags := \
-    -Wl,-melf32ltsmip
diff --git a/core/combo/arch/mips/mips32r2-fp-xburst.mk b/core/combo/arch/mips/mips32r2-fp-xburst.mk
index 09b3bc2109..83fb12ee9e 100644
--- a/core/combo/arch/mips/mips32r2-fp-xburst.mk
+++ b/core/combo/arch/mips/mips32r2-fp-xburst.mk
@@ -4,13 +4,3 @@
 
 ARCH_MIPS_HAS_FPU :=true
 ARCH_HAVE_ALIGNED_DOUBLES :=true
-arch_variant_cflags := \
-    -mips32r2 \
-    -mfp32 \
-    -modd-spreg \
-    -mno-fused-madd \
-    -Wa,-mmxu \
-    -mno-synci
-
-arch_variant_ldflags := \
-    -Wl,-melf32ltsmip
diff --git a/core/combo/arch/mips/mips32r2-fp.mk b/core/combo/arch/mips/mips32r2-fp.mk
index 9acb0185fe..97c14c3ce7 100644
--- a/core/combo/arch/mips/mips32r2-fp.mk
+++ b/core/combo/arch/mips/mips32r2-fp.mk
@@ -3,11 +3,3 @@
 
 ARCH_MIPS_HAS_FPU	:=true
 ARCH_HAVE_ALIGNED_DOUBLES :=true
-arch_variant_cflags := \
-    -mips32r2 \
-    -mfp32 \
-    -modd-spreg \
-    -msynci
-
-arch_variant_ldflags := \
-    -Wl,-melf32ltsmip
diff --git a/core/combo/arch/mips/mips32r2dsp-fp.mk b/core/combo/arch/mips/mips32r2dsp-fp.mk
index c4b49b6c06..522b6b95f0 100644
--- a/core/combo/arch/mips/mips32r2dsp-fp.mk
+++ b/core/combo/arch/mips/mips32r2dsp-fp.mk
@@ -5,12 +5,3 @@ ARCH_MIPS_HAS_DSP  	:=true
 ARCH_MIPS_DSP_REV	:=1
 ARCH_MIPS_HAS_FPU       :=true
 ARCH_HAVE_ALIGNED_DOUBLES :=true
-arch_variant_cflags := \
-    -mips32r2 \
-    -mfp32 \
-    -modd-spreg \
-    -mdsp \
-    -msynci
-
-arch_variant_ldflags := \
-    -Wl,-melf32ltsmip
diff --git a/core/combo/arch/mips/mips32r2dspr2-fp.mk b/core/combo/arch/mips/mips32r2dspr2-fp.mk
index 8b05ffc514..886d378909 100644
--- a/core/combo/arch/mips/mips32r2dspr2-fp.mk
+++ b/core/combo/arch/mips/mips32r2dspr2-fp.mk
@@ -5,12 +5,3 @@ ARCH_MIPS_HAS_DSP  	:=true
 ARCH_MIPS_DSP_REV	:=2
 ARCH_MIPS_HAS_FPU       :=true
 ARCH_HAVE_ALIGNED_DOUBLES :=true
-arch_variant_cflags := \
-    -mips32r2 \
-    -mfp32 \
-    -modd-spreg \
-    -mdspr2 \
-    -msynci
-
-arch_variant_ldflags := \
-    -Wl,-melf32ltsmip
diff --git a/core/combo/arch/mips/mips32r6.mk b/core/combo/arch/mips/mips32r6.mk
index 315aa60eef..7bc6cac4d2 100644
--- a/core/combo/arch/mips/mips32r6.mk
+++ b/core/combo/arch/mips/mips32r6.mk
@@ -2,11 +2,3 @@
 # Generating binaries for MIPS32R6/hard-float/little-endian
 
 ARCH_MIPS_REV6 := true
-arch_variant_cflags := \
-    -mips32r6 \
-    -mfp64 \
-    -mno-odd-spreg \
-    -msynci
-
-arch_variant_ldflags := \
-    -Wl,-melf32ltsmip
diff --git a/core/combo/arch/mips64/mips64r2.mk b/core/combo/arch/mips64/mips64r2.mk
index c5710d0bad..54aa387720 100644
--- a/core/combo/arch/mips64/mips64r2.mk
+++ b/core/combo/arch/mips64/mips64r2.mk
@@ -4,7 +4,3 @@
 
 ARCH_MIPS_HAS_FPU	:=true
 ARCH_HAVE_ALIGNED_DOUBLES :=true
-arch_variant_cflags := \
-    -mips64r2 \
-    -msynci
-
diff --git a/core/combo/arch/mips64/mips64r6.mk b/core/combo/arch/mips64/mips64r6.mk
index 443de208b9..9d9068c89f 100644
--- a/core/combo/arch/mips64/mips64r6.mk
+++ b/core/combo/arch/mips64/mips64r6.mk
@@ -1,7 +1,3 @@
 # Configuration for Android on mips64r6.
 
 ARCH_MIPS_REV6 := true
-arch_variant_cflags := \
-    -mips64r6 \
-    -msynci
-
diff --git a/core/combo/arch/x86/atom.mk b/core/combo/arch/x86/atom.mk
index 3800350a39..d313a9ae0c 100644
--- a/core/combo/arch/x86/atom.mk
+++ b/core/combo/arch/x86/atom.mk
@@ -7,9 +7,3 @@
 ARCH_X86_HAVE_SSSE3 := true
 ARCH_X86_HAVE_MOVBE := true
 ARCH_X86_HAVE_POPCNT := false   # popcnt is not supported by current Atom CPUs
-
-# CFLAGS for this arch
-arch_variant_cflags := \
-	-march=atom \
-	-mfpmath=sse \
-
diff --git a/core/combo/arch/x86/haswell.mk b/core/combo/arch/x86/haswell.mk
index b3922c0451..50c27b4f79 100644
--- a/core/combo/arch/x86/haswell.mk
+++ b/core/combo/arch/x86/haswell.mk
@@ -9,9 +9,3 @@ ARCH_X86_HAVE_AES_NI := true
 ARCH_X86_HAVE_AVX    := true
 ARCH_X86_HAVE_POPCNT := true
 ARCH_X86_HAVE_MOVBE  := true
-
-# CFLAGS for this arch
-arch_variant_cflags := \
-	-march=core-avx2 \
-	-mfpmath=sse \
-
diff --git a/core/combo/arch/x86/ivybridge.mk b/core/combo/arch/x86/ivybridge.mk
index c9fc33b013..44035d8e00 100644
--- a/core/combo/arch/x86/ivybridge.mk
+++ b/core/combo/arch/x86/ivybridge.mk
@@ -9,9 +9,3 @@ ARCH_X86_HAVE_AES_NI := true
 ARCH_X86_HAVE_AVX    := true
 ARCH_X86_HAVE_POPCNT := true
 ARCH_X86_HAVE_MOVBE  := false
-
-# CFLAGS for this arch
-arch_variant_cflags := \
-	-march=core-avx-i \
-	-mfpmath=sse \
-
diff --git a/core/combo/arch/x86/sandybridge.mk b/core/combo/arch/x86/sandybridge.mk
index 830e1db52a..a4c1bd9129 100644
--- a/core/combo/arch/x86/sandybridge.mk
+++ b/core/combo/arch/x86/sandybridge.mk
@@ -9,9 +9,3 @@ ARCH_X86_HAVE_AES_NI := false
 ARCH_X86_HAVE_AVX    := false
 ARCH_X86_HAVE_POPCNT := true
 ARCH_X86_HAVE_MOVBE  := false
-
-# CFLAGS for this arch
-arch_variant_cflags := \
-	-march=corei7 \
-	-mfpmath=sse \
-
diff --git a/core/combo/arch/x86/silvermont.mk b/core/combo/arch/x86/silvermont.mk
index d064b1df27..70b718cac7 100644
--- a/core/combo/arch/x86/silvermont.mk
+++ b/core/combo/arch/x86/silvermont.mk
@@ -11,9 +11,3 @@ ARCH_X86_HAVE_SSE4_2 := true
 ARCH_X86_HAVE_AES_NI := true
 ARCH_X86_HAVE_POPCNT := true
 ARCH_X86_HAVE_MOVBE  := true
-
-# CFLAGS for this arch
-arch_variant_cflags := \
-	-march=slm \
-	-mfpmath=sse \
-
diff --git a/core/combo/arch/x86/x86.mk b/core/combo/arch/x86/x86.mk
index f0704263b7..a55cc7aa59 100644
--- a/core/combo/arch/x86/x86.mk
+++ b/core/combo/arch/x86/x86.mk
@@ -11,9 +11,3 @@
 ARCH_X86_HAVE_SSSE3 := false
 ARCH_X86_HAVE_MOVBE := false
 ARCH_X86_HAVE_POPCNT := false
-
-
-# Some intrinsic functions used by libcxx only exist for prescott or newer CPUs.
-arch_variant_cflags := \
-    -march=prescott \
-
diff --git a/core/combo/arch/x86/x86_64.mk b/core/combo/arch/x86/x86_64.mk
index 620fbd80bf..fc2a0873b9 100644
--- a/core/combo/arch/x86/x86_64.mk
+++ b/core/combo/arch/x86/x86_64.mk
@@ -10,9 +10,3 @@ ARCH_X86_HAVE_POPCNT := true
 ARCH_X86_HAVE_SSE4 := true
 ARCH_X86_HAVE_SSE4_1 := true
 ARCH_X86_HAVE_SSE4_2 := true
-
-
-# Some intrinsic functions used by libcxx only exist for prescott or newer CPUs.
-arch_variant_cflags := \
-    -march=prescott \
-
diff --git a/core/combo/arch/x86_64/haswell.mk b/core/combo/arch/x86_64/haswell.mk
index 6067eee650..f9c6ebdd2b 100644
--- a/core/combo/arch/x86_64/haswell.mk
+++ b/core/combo/arch/x86_64/haswell.mk
@@ -9,7 +9,3 @@ ARCH_X86_HAVE_AES_NI := true
 ARCH_X86_HAVE_AVX    := true
 ARCH_X86_HAVE_POPCNT := true
 ARCH_X86_HAVE_MOVBE  := true
-
-# CFLAGS for this arch
-arch_variant_cflags := \
-	-march=core-avx2
diff --git a/core/combo/arch/x86_64/ivybridge.mk b/core/combo/arch/x86_64/ivybridge.mk
index 90e23a9f22..69011d6894 100644
--- a/core/combo/arch/x86_64/ivybridge.mk
+++ b/core/combo/arch/x86_64/ivybridge.mk
@@ -9,7 +9,3 @@ ARCH_X86_HAVE_AES_NI := true
 ARCH_X86_HAVE_AVX    := true
 ARCH_X86_HAVE_POPCNT := true
 ARCH_X86_HAVE_MOVBE  := false
-
-# CFLAGS for this arch
-arch_variant_cflags := \
-	-march=core-avx-i
diff --git a/core/combo/arch/x86_64/sandybridge.mk b/core/combo/arch/x86_64/sandybridge.mk
index 574ec8aed2..2092d1964c 100644
--- a/core/combo/arch/x86_64/sandybridge.mk
+++ b/core/combo/arch/x86_64/sandybridge.mk
@@ -9,7 +9,3 @@ ARCH_X86_HAVE_AES_NI := false
 ARCH_X86_HAVE_AVX    := false
 ARCH_X86_HAVE_POPCNT := true
 ARCH_X86_HAVE_MOVBE  := false
-
-# CFLAGS for this arch
-arch_variant_cflags := \
-	-march=corei7
diff --git a/core/combo/arch/x86_64/silvermont.mk b/core/combo/arch/x86_64/silvermont.mk
index 6c953a349b..70b718cac7 100644
--- a/core/combo/arch/x86_64/silvermont.mk
+++ b/core/combo/arch/x86_64/silvermont.mk
@@ -11,7 +11,3 @@ ARCH_X86_HAVE_SSE4_2 := true
 ARCH_X86_HAVE_AES_NI := true
 ARCH_X86_HAVE_POPCNT := true
 ARCH_X86_HAVE_MOVBE  := true
-
-# CFLAGS for this arch
-arch_variant_cflags := \
-	-march=slm \
diff --git a/core/combo/arch/x86_64/x86_64.mk b/core/combo/arch/x86_64/x86_64.mk
index 08dd9cd86d..26a9d0f45a 100755
--- a/core/combo/arch/x86_64/x86_64.mk
+++ b/core/combo/arch/x86_64/x86_64.mk
@@ -11,8 +11,3 @@ ARCH_X86_HAVE_POPCNT := true
 ARCH_X86_HAVE_SSE4 := true
 ARCH_X86_HAVE_SSE4_1 := true
 ARCH_X86_HAVE_SSE4_2 := true
-
-
-# CFLAGS for this arch
-arch_variant_cflags := \
-    -march=x86-64
diff --git a/core/combo/mac_version.mk b/core/combo/mac_version.mk
deleted file mode 100644
index 380aabe06f..0000000000
--- a/core/combo/mac_version.mk
+++ /dev/null
@@ -1,50 +0,0 @@
-# Detect Mac OS X and SDK versions.
-# Output variables:
-#   build_mac_version
-#   mac_sdk_version
-#   mac_sdk_root
-#   gcc_darwin_version
-
-# You can no longer install older SDKs in newer xcode versions, so it appears
-# to be expected to use the newer SDKs, but set command line flags in order to
-# target older Mac OS X versions.
-#
-# We'll use the oldest SDK we can find, and then use the -mmacosx-version-min
-# and MACOSX_DEPLOYMENT_TARGET flags to set our minimum version.
-
-ifndef build_mac_version
-
-build_mac_version := $(shell sw_vers -productVersion)
-
-mac_sdk_versions_supported :=  10.8 10.9 10.10 10.11
-ifneq ($(strip $(MAC_SDK_VERSION)),)
-mac_sdk_version := $(MAC_SDK_VERSION)
-ifeq ($(filter $(mac_sdk_version),$(mac_sdk_versions_supported)),)
-$(warning ****************************************************************)
-$(warning * MAC_SDK_VERSION $(MAC_SDK_VERSION) isn't one of the supported $(mac_sdk_versions_supported))
-$(warning ****************************************************************)
-$(error Stop.)
-endif
-else
-mac_sdk_versions_installed := $(shell xcodebuild -showsdks | grep macosx | sed -e "s/.*macosx//g")
-mac_sdk_version := $(firstword $(filter $(mac_sdk_versions_installed), $(mac_sdk_versions_supported)))
-ifeq ($(mac_sdk_version),)
-mac_sdk_version := $(firstword $(mac_sdk_versions_supported))
-endif
-endif
-
-mac_sdk_path := $(shell xcode-select -print-path)
-# try /Applications/Xcode*.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.?.sdk
-#  or /Volume/Xcode/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.?.sdk
-mac_sdk_root := $(mac_sdk_path)/Platforms/MacOSX.platform/Developer/SDKs/MacOSX$(mac_sdk_version).sdk
-ifeq ($(wildcard $(mac_sdk_root)),)
-$(warning *****************************************************)
-$(warning * Can not find SDK $(mac_sdk_version) at $(mac_sdk_root))
-$(warning *****************************************************)
-$(error Stop.)
-endif
-
-# Set to the minimum version of OS X that we want to run on.
-mac_sdk_version := $(firstword $(mac_sdk_versions_supported))
-
-endif  # ifndef build_mac_version
diff --git a/core/combo/select.mk b/core/combo/select.mk
index 7e182aedd8..5e181b9d81 100644
--- a/core/combo/select.mk
+++ b/core/combo/select.mk
@@ -28,13 +28,8 @@ combo_var_prefix := $(combo_2nd_arch_prefix)$(combo_target)
 
 # Set reasonable defaults for the various variables
 
-$(combo_var_prefix)RELEASE_CFLAGS := -O2 -g -fno-strict-aliasing
 $(combo_var_prefix)GLOBAL_ARFLAGS := crsPD
-$(combo_var_prefix)GLOBAL_LD_DIRS :=
 
-$(combo_var_prefix)EXECUTABLE_SUFFIX :=
-$(combo_var_prefix)SHLIB_SUFFIX := .so
-$(combo_var_prefix)JNILIB_SUFFIX := $($(combo_var_prefix)SHLIB_SUFFIX)
 $(combo_var_prefix)STATIC_LIB_SUFFIX := .a
 
 # Now include the combo for this specific target.
diff --git a/core/config.mk b/core/config.mk
index bdec8574bf..727a5a80ac 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -329,6 +329,12 @@ TARGET_CPU_ABI_LIST := $(subst $(space),$(comma),$(strip $(TARGET_CPU_ABI_LIST))
 TARGET_CPU_ABI_LIST_32_BIT := $(subst $(space),$(comma),$(strip $(TARGET_CPU_ABI_LIST_32_BIT)))
 TARGET_CPU_ABI_LIST_64_BIT := $(subst $(space),$(comma),$(strip $(TARGET_CPU_ABI_LIST_64_BIT)))
 
+# GCC version selection
+TARGET_GCC_VERSION := 4.9
+ifdef TARGET_2ND_ARCH
+2ND_TARGET_GCC_VERSION := 4.9
+endif
+
 # Normalize WITH_STATIC_ANALYZER and WITH_SYNTAX_CHECK
 ifeq ($(strip $(WITH_STATIC_ANALYZER)),0)
   WITH_STATIC_ANALYZER :=
@@ -641,27 +647,6 @@ endif
 # Set up final options.
 # ###############################################################
 
-ifneq ($(COMMON_GLOBAL_CFLAGS)$(COMMON_GLOBAL_CPPFLAGS),)
-$(warning COMMON_GLOBAL_C(PP)FLAGS changed)
-$(info *** Device configurations are no longer allowed to change the global flags.)
-$(info *** COMMON_GLOBAL_CFLAGS: $(COMMON_GLOBAL_CFLAGS))
-$(info *** COMMON_GLOBAL_CPPFLAGS: $(COMMON_GLOBAL_CPPFLAGS))
-$(error bailing...)
-endif
-
-# These can be changed to modify both host and device modules.
-COMMON_GLOBAL_CFLAGS:= -DANDROID -fmessage-length=0 -W -Wall -Wno-unused -Winit-self -Wpointer-arith
-COMMON_RELEASE_CFLAGS:= -DNDEBUG -UDEBUG
-
-# Force gcc to always output color diagnostics.  Ninja will strip the ANSI
-# color codes if it is not running in a terminal.
-ifdef BUILDING_WITH_NINJA
-COMMON_GLOBAL_CFLAGS += -fdiagnostics-color
-endif
-
-COMMON_GLOBAL_CPPFLAGS:= -Wsign-promo
-COMMON_RELEASE_CPPFLAGS:=
-
 GLOBAL_CFLAGS_NO_OVERRIDE := \
     -Werror=int-to-pointer-cast \
     -Werror=pointer-to-int-cast \
@@ -673,45 +658,18 @@ GLOBAL_CLANG_CFLAGS_NO_OVERRIDE := \
 
 GLOBAL_CPPFLAGS_NO_OVERRIDE :=
 
-# list of flags to turn specific warnings in to errors
-TARGET_ERROR_FLAGS := -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Werror=date-time
-
 # We run gcc/clang with PWD=/proc/self/cwd to remove the $TOP
 # from the debug output. That way two builds in two different
 # directories will create the same output.
 # /proc doesn't exist on Darwin.
 ifeq ($(HOST_OS),linux)
 RELATIVE_PWD := PWD=/proc/self/cwd
-# Remove this useless prefix from the debug output.
-COMMON_GLOBAL_CFLAGS += -fdebug-prefix-map=/proc/self/cwd=
 else
 RELATIVE_PWD :=
 endif
 
-# Allow the C/C++ macros __DATE__ and __TIME__ to be set to the
-# build date and time, so that a build may be repeated.
-# Write the date and time to a file so that the command line
-# doesn't change every time, which would cause ninja to rebuild
-# the files.
-$(shell mkdir -p $(OUT_DIR) && \
-    $(DATE) "+%b %_d %Y" > $(OUT_DIR)/build_c_date.txt && \
-    $(DATE) +%T > $(OUT_DIR)/build_c_time.txt)
-BUILD_DATETIME_C_DATE := $$(cat $(OUT_DIR)/build_c_date.txt)
-BUILD_DATETIME_C_TIME := $$(cat $(OUT_DIR)/build_c_time.txt)
-ifeq ($(OVERRIDE_C_DATE_TIME),true)
-COMMON_GLOBAL_CFLAGS += -Wno-builtin-macro-redefined -D__DATE__="\"$(BUILD_DATETIME_C_DATE)\"" -D__TIME__=\"$(BUILD_DATETIME_C_TIME)\"
-endif
-
-HOST_RELEASE_CFLAGS += $(COMMON_RELEASE_CFLAGS)
-
-HOST_RELEASE_CPPFLAGS += $(COMMON_RELEASE_CPPFLAGS)
-
-TARGET_RELEASE_CFLAGS += $(COMMON_RELEASE_CFLAGS)
-
-TARGET_RELEASE_CPPFLAGS += $(COMMON_RELEASE_CPPFLAGS)
-
-HOST_GLOBAL_LD_DIRS += -L$(HOST_OUT_INTERMEDIATE_LIBRARIES)
-TARGET_GLOBAL_LD_DIRS += -L$(TARGET_OUT_INTERMEDIATE_LIBRARIES)
+HOST_GLOBAL_LD_DIRS := -L$(HOST_OUT_INTERMEDIATE_LIBRARIES)
+TARGET_GLOBAL_LD_DIRS := -L$(TARGET_OUT_INTERMEDIATE_LIBRARIES)
 
 HOST_PROJECT_INCLUDES:= $(SRC_HEADERS) $(HOST_OUT_HEADERS)
 TARGET_PROJECT_INCLUDES:= $(SRC_HEADERS) $(TARGET_OUT_HEADERS) \
@@ -719,29 +677,21 @@ TARGET_PROJECT_INCLUDES:= $(SRC_HEADERS) $(TARGET_OUT_HEADERS) \
 		$(TARGET_PRODUCT_KERNEL_HEADERS)
 
 ifdef TARGET_2ND_ARCH
-$(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_RELEASE_CFLAGS += $(COMMON_RELEASE_CFLAGS)
-$(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_RELEASE_CPPFLAGS += $(COMMON_RELEASE_CPPFLAGS)
-$(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_GLOBAL_LD_DIRS += -L$($(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_OUT_INTERMEDIATE_LIBRARIES)
+$(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_GLOBAL_LD_DIRS := -L$($(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_OUT_INTERMEDIATE_LIBRARIES)
 $(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_PROJECT_INCLUDES := $(TARGET_PROJECT_INCLUDES)
 endif
 
 ifdef HOST_2ND_ARCH
-$(HOST_2ND_ARCH_VAR_PREFIX)HOST_RELEASE_CFLAGS += $(COMMON_RELEASE_CFLAGS)
-$(HOST_2ND_ARCH_VAR_PREFIX)HOST_RELEASE_CPPFLAGS += $(COMMON_RELEASE_CPPFLAGS)
-$(HOST_2ND_ARCH_VAR_PREFIX)HOST_GLOBAL_LD_DIRS += -L$($(HOST_2ND_ARCH_VAR_PREFIX)HOST_OUT_INTERMEDIATE_LIBRARIES)
+$(HOST_2ND_ARCH_VAR_PREFIX)HOST_GLOBAL_LD_DIRS := -L$($(HOST_2ND_ARCH_VAR_PREFIX)HOST_OUT_INTERMEDIATE_LIBRARIES)
 $(HOST_2ND_ARCH_VAR_PREFIX)HOST_PROJECT_INCLUDES := $(HOST_PROJECT_INCLUDES)
 endif
 
 ifdef HOST_CROSS_OS
-HOST_CROSS_RELEASE_CFLAGS += $(COMMON_RELEASE_CFLAGS)
-HOST_CROSS_RELEASE_CPPFLAGS += $(COMMON_RELEASE_CPPFLAGS)
-HOST_CROSS_GLOBAL_LD_DIRS += -L$(HOST_CROSS_OUT_INTERMEDIATE_LIBRARIES)
+HOST_CROSS_GLOBAL_LD_DIRS := -L$(HOST_CROSS_OUT_INTERMEDIATE_LIBRARIES)
 HOST_CROSS_PROJECT_INCLUDES:= $(SRC_HEADERS) $(HOST_CROSS_OUT_HEADERS)
 
 ifdef HOST_CROSS_2ND_ARCH
-$(HOST_CROSS_2ND_ARCH_VAR_PREFIX)HOST_CROSS_RELEASE_CFLAGS += $(COMMON_RELEASE_CFLAGS)
-$(HOST_CROSS_2ND_ARCH_VAR_PREFIX)HOST_CROSS_RELEASE_CPPFLAGS += $(COMMON_RELEASE_CPPFLAGS)
-$(HOST_CROSS_2ND_ARCH_VAR_PREFIX)HOST_CROSS_GLOBAL_LD_DIRS += -L$($(HOST_CROSS_2ND_ARCH_VAR_PREFIX)HOST_CROSS_OUT_INTERMEDIATE_LIBRARIES)
+$(HOST_CROSS_2ND_ARCH_VAR_PREFIX)HOST_CROSS_GLOBAL_LD_DIRS := -L$($(HOST_CROSS_2ND_ARCH_VAR_PREFIX)HOST_CROSS_OUT_INTERMEDIATE_LIBRARIES)
 $(HOST_CROSS_2ND_ARCH_VAR_PREFIX)HOST_CROSS_PROJECT_INCLUDES:= $(SRC_HEADERS) $($(HOST_CROSS_2ND_ARCH_VAR_PREFIX)HOST_CROSS_OUT_HEADERS)
 endif
 endif
diff --git a/core/envsetup.mk b/core/envsetup.mk
index 1a79ce238c..e7981461b0 100644
--- a/core/envsetup.mk
+++ b/core/envsetup.mk
@@ -65,6 +65,7 @@ ifeq ($(HOST_OS),linux)
 HOST_CROSS_OS := windows
 HOST_CROSS_ARCH := x86
 HOST_CROSS_2ND_ARCH := x86_64
+2ND_HOST_CROSS_IS_64_BIT := true
 endif
 
 ifeq ($(HOST_OS),)
diff --git a/core/executable_internal.mk b/core/executable_internal.mk
index 38084129d2..2b8a47c18a 100644
--- a/core/executable_internal.mk
+++ b/core/executable_internal.mk
@@ -46,9 +46,9 @@ my_target_crtbegin_dynamic_o :=
 my_target_crtbegin_static_o :=
 my_target_crtend_o :=
 else
-my_target_crtbegin_dynamic_o := $($(LOCAL_2ND_ARCH_VAR_PREFIX)TARGET_CRTBEGIN_DYNAMIC_O)
-my_target_crtbegin_static_o := $($(LOCAL_2ND_ARCH_VAR_PREFIX)TARGET_CRTBEGIN_STATIC_O)
-my_target_crtend_o := $($(LOCAL_2ND_ARCH_VAR_PREFIX)TARGET_CRTEND_O)
+my_target_crtbegin_dynamic_o := $($(LOCAL_2ND_ARCH_VAR_PREFIX)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_dynamic.o
+my_target_crtbegin_static_o := $($(LOCAL_2ND_ARCH_VAR_PREFIX)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_static.o
+my_target_crtend_o := $($(LOCAL_2ND_ARCH_VAR_PREFIX)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtend_android.o
 endif
 ifdef LOCAL_SDK_VERSION
 # Make sure the prebuilt NDK paths are put ahead of the TARGET_GLOBAL_LD_DIRS,
diff --git a/core/shared_library_internal.mk b/core/shared_library_internal.mk
index cf35b5e5c5..35899f92f6 100644
--- a/core/shared_library_internal.mk
+++ b/core/shared_library_internal.mk
@@ -50,8 +50,8 @@ ifeq ($(LOCAL_NO_CRT),true)
 my_target_crtbegin_so_o :=
 my_target_crtend_so_o :=
 else
-my_target_crtbegin_so_o := $($(LOCAL_2ND_ARCH_VAR_PREFIX)TARGET_CRTBEGIN_SO_O)
-my_target_crtend_so_o := $($(LOCAL_2ND_ARCH_VAR_PREFIX)TARGET_CRTEND_SO_O)
+my_target_crtbegin_so_o := $($(LOCAL_2ND_ARCH_VAR_PREFIX)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtbegin_so.o
+my_target_crtend_so_o := $($(LOCAL_2ND_ARCH_VAR_PREFIX)TARGET_OUT_INTERMEDIATE_LIBRARIES)/crtend_so.o
 endif
 ifdef LOCAL_SDK_VERSION
 # Make sure the prebuilt NDK paths are put ahead of the TARGET_GLOBAL_LD_DIRS,