diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8136829a5095f9daf2a2e76d51d26141edf86224..de62382b783b65a4ec8803532e741d5329dd1efe 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -33,9 +33,7 @@ if(WIN32)
     set(CMAKE_CXX_FLAGS_RELEASE   "${CMAKE_CXX_FLAGS_RELEASE} /bigobj /MT")
 endif(WIN32)
 
-if(NOT CMAKE_CROSSCOMPILING)
-    find_package(CUDA QUIET)
-endif(NOT CMAKE_CROSSCOMPILING)
+find_package(CUDA QUIET)
 find_package(Git REQUIRED)
 find_package(Threads REQUIRED)
 
diff --git a/cmake/cblas.cmake b/cmake/cblas.cmake
index 24de8d9d7ced5f8111cc5d65f761b7506bde048e..74b1ef2122cf3d12e39576295b2457884a280565 100644
--- a/cmake/cblas.cmake
+++ b/cmake/cblas.cmake
@@ -64,24 +64,18 @@ endif()
 ## Then find the reference-cblas.  www.netlib.org/blas/
 set(REFERENCE_CBLAS_ROOT $ENV{REFERENCE_CBLAS_ROOT} CACHE PATH
   "Folder contains reference-cblas")
-if(NOT CMAKE_CROSSCOMPILING)
-  set(REFERENCE_CBLAS_INCLUDE_SEARCH_PATHS
-    ${REFERENCE_CBLAS_ROOT}/include
-    /usr/include
-    /usr/include/cblas
-  )
+set(REFERENCE_CBLAS_INCLUDE_SEARCH_PATHS
+  ${REFERENCE_CBLAS_ROOT}/include
+  /usr/include
+  /usr/include/cblas
+)
 
-  set(REFERENCE_CBLAS_LIB_SEARCH_PATHS
-    ${REFERENCE_CBLAS_ROOT}/lib
-    /usr/lib
-    /usr/lib/blas/reference/
-    /usr/lib/reference/
-  )
-else()
-  # Disable the finding of reference cblas under host's system path
-  set(REFERENCE_CBLAS_INCLUDE_SEARCH_PATHS ${REFERENCE_CBLAS_ROOT}/include)
-  set(REFERENCE_CBLAS_LIB_SEARCH_PATHS ${REFERENCE_CBLAS_ROOT}/lib)
-endif()
+set(REFERENCE_CBLAS_LIB_SEARCH_PATHS
+  ${REFERENCE_CBLAS_ROOT}/lib
+  /usr/lib
+  /usr/lib/blas/reference/
+  /usr/lib/reference/
+)
 
 if(WITH_SYSTEM_BLAS)
   find_path(REFERENCE_CBLAS_INCLUDE_DIR NAMES cblas.h PATHS
diff --git a/cmake/configure.cmake b/cmake/configure.cmake
index e3d856fb30d8103f50ebcb6dc16153c8ed2a97a6..076e839120d98d801de4374f2f8338ebd918b88f 100644
--- a/cmake/configure.cmake
+++ b/cmake/configure.cmake
@@ -49,12 +49,10 @@ if(NOT WITH_PROFILER)
     add_definitions(-DPADDLE_DISABLE_PROFILER)
 endif(NOT WITH_PROFILER)
 
-if(NOT CMAKE_CROSSCOMPILING)
-    if(WITH_AVX AND AVX_FOUND)
-        set(SIMD_FLAG ${AVX_FLAG})
-    elseif(SSE3_FOUND)
-        set(SIMD_FLAG ${SSE3_FLAG})
-    endif()
+if(WITH_AVX AND AVX_FOUND)
+    set(SIMD_FLAG ${AVX_FLAG})
+elseif(SSE3_FOUND)
+    set(SIMD_FLAG ${SSE3_FLAG})
 endif()
 
 if(WIN32)
diff --git a/cmake/cross_compiling/android.cmake b/cmake/cross_compiling/android.cmake
deleted file mode 100644
index 4cf2be3bdf07ed018c57cd6bc305a3eda9c9a23d..0000000000000000000000000000000000000000
--- a/cmake/cross_compiling/android.cmake
+++ /dev/null
@@ -1,236 +0,0 @@
-# Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserved.
-# 
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-# 
-# http://www.apache.org/licenses/LICENSE-2.0
-# 
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-# This is a toolchain file for cross-compiling for Android, and the
-# configuration refers to the open-source resposity:
-#     https://github.com/taka-no-me/android-cmake
-# Most of the variables are compatible with that used in
-#     https://developer.android.com/ndk/guides/cmake.html
-# The supported variables are listed belows:
-# 
-# ANDROID_STANDALONE_TOOLCHAIN
-# ANDROID_TOOLCHAIN
-# ANDROID_ABI
-# ANDROID_NATIVE_API_LEVEL
-# ANDROID_ARM_MODE
-# ANDROID_ARM_NEON
-#
-# For CMake >= 3.7.0, all the settings will be delivered to CMake system
-# variables to let CMake do the cross-compiling configurations itself.
-# More detail of cross-compiling settings
-#     https://cmake.org/cmake/help/v3.7/manual/cmake-toolchains.7.html
-
-IF(NOT ANDROID)
-    return()
-ENDIF()
-
-# check the exist of android standalone toolchain
-IF(NOT DEFINED ANDROID_STANDALONE_TOOLCHAIN)
-    SET(ANDROID_STANDALONE_TOOLCHAIN $ENV{ANDROID_STANDALONE_TOOLCHAIN}
-        CACHE PATH "Folder holds the standalone toolchain of Android NDK")
-ENDIF()
-IF(NOT ANDROID_STANDALONE_TOOLCHAIN)
-    MESSAGE(WARNING "It is recommended to set ANDROID_STANDALONE_TOOLCHAIN to "
-            "use a standalone toolchain.\n"
-            "To cross-compile for Android, you need to:\n"
-            "1. Download an Android NDK from"
-            " https://developer.android.com/ndk/downloads/index.html\n"
-            "2. Setup a standalone toolchain"
-            "https://developer.android.google.cn/ndk/guides/standalone_toolchain.html?hl=zh-cn\n")
-ENDIF()
-
-IF(NOT DEFINED CMAKE_SYSTEM_VERSION AND ANDROID_NATIVE_API_LEVEL)
-    IF(ANDROID_NATIVE_API_LEVEL MATCHES "^android-[0-9]+$")
-        STRING(REPLACE "android-" "" CMAKE_SYSTEM_VERSION "${CMAKE_MATCH_0}")
-    ELSEIF(ANDROID_NATIVE_API_LEVEL MATCHES "^[0-9]+$")
-        SET(CMAKE_SYSTEM_VERSION ${ANDROID_NATIVE_API_LEVEL})
-    ENDIF()
-ENDIF()
-
-IF(NOT DEFINED ANDROID_TOOLCHAIN)
-    SET(ANDROID_TOOLCHAIN clang)
-ENDIF()
-
-IF(NOT DEFINED ANDROID_ABI)
-    SET(ANDROID_ABI "armeabi-v7a")
-ENDIF()
-
-IF(NOT DEFINED ANDROID_ARM_MODE)
-    SET(ANDROID_ARM_MODE ON)
-ENDIF()
-IF(ANDROID_ARM_MODE)
-    SET(ANDROID_ARM_MODE_NAME "arm")
-ELSE(ANDROID_ARM_MODE)
-    SET(ANDROID_ARM_MODE_NAME "thumb")
-ENDIF(ANDROID_ARM_MODE)
-
-IF(NOT DEFINED ANDROID_ARM_NEON)
-    SET(ANDROID_ARM_NEON ON)
-ENDIF()
-
-IF("${CMAKE_VERSION}" VERSION_LESS "3.7.0")
-    IF("${CMAKE_VERSION}" VERSION_LESS "3.1.0")
-        SET(CMAKE_SYSTEM_NAME "Linux")
-    ENDIF()
-    MESSAGE(WARNING "It is recommended to use CMake >= 3.7.0 (current version: "
-            "${CMAKE_VERSION}), when cross-compiling for Android.")
-
-    IF(ANDROID_STANDALONE_TOOLCHAIN)
-        # Use standalone toolchain
-        SET(CMAKE_SYSROOT "${ANDROID_STANDALONE_TOOLCHAIN}/sysroot")
-
-        IF(NOT CMAKE_SYSTEM_VERSION)
-            SET(ANDROID_STANDALONE_TOOLCHAIN_API "")
-            SET(ANDROID_API_LEVEL_H_REGEX "^[\t ]*#[\t ]*define[\t ]+__ANDROID_API__[\t ]+([0-9]+)")
-            FILE(STRINGS "${ANDROID_STANDALONE_TOOLCHAIN}/sysroot/usr/include/android/api-level.h"
-                ANDROID_API_LEVEL_H_CONTENT REGEX "${ANDROID_API_LEVEL_H_REGEX}")
-            IF(ANDROID_API_LEVEL_H_CONTENT MATCHES "${ANDROID_API_LEVEL_H_REGEX}")
-                SET(ANDROID_STANDALONE_TOOLCHAIN_API "${CMAKE_MATCH_1}")
-            ENDIF()
-            SET(CMAKE_SYSTEM_VERSION ${ANDROID_STANDALONE_TOOLCHAIN_API})
-        ENDIF()
-
-        # Toolchain
-        SET(ANDROID_TOOLCHAIN_ROOT ${ANDROID_STANDALONE_TOOLCHAIN})
-    ELSE(ANDROID_NDK)
-        # TODO: use android ndk
-    ENDIF()
-
-    IF(ANDROID_ABI MATCHES "^armeabi(-v7a)?$")
-        SET(ANDROID_TOOLCHAIN_NAME arm-linux-androideabi)
-        IF(ANDROID_ABI STREQUAL "armeabi")
-            SET(CMAKE_SYSTEM_PROCESSOR armv5te)
-            SET(ANDROID_CLANG_TRIPLE armv5te-none-linux-androideabi)
-        ELSEIF(ANDROID_ABI STREQUAL "armeabi-v7a")
-            SET(CMAKE_SYSTEM_PROCESSOR armv7-a)
-            SET(ANDROID_CLANG_TRIPLE armv7-none-linux-androideabi)
-        ENDIF()
-    ELSEIF(ANDROID_ABI STREQUAL "arm64-v8a")
-        SET(ANDROID_TOOLCHAIN_NAME aarch64-linux-android)
-        SET(CMAKE_SYSTEM_PROCESSOR aarch64)
-        SET(ANDROID_CLANG_TRIPLE aarch64-none-linux-android)
-    ELSE()
-        MESSAGE(FATAL_ERROR "Invalid Android ABI: ${ANDROID_ABI}.")
-    ENDIF()
-    SET(ANDROID_TOOLCHAIN_PREFIX "${ANDROID_TOOLCHAIN_ROOT}/bin/${ANDROID_TOOLCHAIN_NAME}-")
-
-    IF(ANDROID_TOOLCHAIN STREQUAL clang)
-        SET(ANDROID_C_COMPILER_NAME clang)
-        SET(ANDROID_CXX_COMPILER_NAME clang++)
-        SET(CMAKE_C_COMPILER_TARGET   ${ANDROID_CLANG_TRIPLE})
-        SET(CMAKE_CXX_COMPILER_TARGET ${ANDROID_CLANG_TRIPLE})
-    ELSEIF(ANDROID_TOOLCHAIN STREQUAL gcc)
-        SET(ANDROID_C_COMPILER_NAME gcc)
-        SET(ANDROID_CXX_COMPILER_NAME g++)
-    ELSE()
-        MESSAGE(FATAL_ERROR "Invalid Android toolchain: ${ANDROID_TOOLCHAIN}")
-    ENDIF()
-
-    # C compiler
-    IF(NOT CMAKE_C_COMPILER)
-        SET(ANDROID_C_COMPILER "${ANDROID_TOOLCHAIN_PREFIX}${ANDROID_C_COMPILER_NAME}")
-    ELSE()
-        GET_FILENAME_COMPONENT(ANDROID_C_COMPILER ${CMAKE_C_COMPILER} PROGRAM)
-    ENDIF()
-    IF(NOT EXISTS ${ANDROID_C_COMPILER})
-        MESSAGE(FATAL_ERROR "Cannot find C compiler: ${ANDROID_C_COMPILER}")
-    ENDIF()
-
-    # CXX compiler
-    IF(NOT CMAKE_CXX_COMPILER)
-        SET(ANDROID_CXX_COMPILER "${ANDROID_TOOLCHAIN_PREFIX}${ANDROID_CXX_COMPILER_NAME}")
-    ELSE()
-        GET_FILENAME_COMPONENT(ANDROID_CXX_COMPILER ${CMAKE_CXX_COMPILER} PROGRAM)
-    ENDIF()
-    IF(NOT EXISTS ${ANDROID_CXX_COMPILER})
-        MESSAGE(FATAL_ERROR "Cannot find CXX compiler: ${ANDROID_CXX_COMPILER}")
-    ENDIF()
-
-    SET(CMAKE_C_COMPILER ${ANDROID_C_COMPILER} CACHE PATH "C compiler" FORCE)
-    SET(CMAKE_CXX_COMPILER ${ANDROID_CXX_COMPILER} CACHE PATH "CXX compiler" FORCE)
-
-    # Toolchain and ABI specific flags.
-    SET(ANDROID_COMPILER_FLAGS "-ffunction-sections -fdata-sections")
-    SET(ANDROID_LINKER_FLAGS "-Wl,--gc-sections")
-
-    IF(ANDROID_ABI STREQUAL "armeabi")
-        LIST(APPEND ANDROID_COMPILER_FLAGS
-             -march=armv5te
-             -mtune=xscale
-             -msoft-float)
-    ELSEIF(ANDROID_ABI STREQUAL "armeabi-v7a")
-        LIST(APPEND ANDROID_COMPILER_FLAGS
-             -march=armv7-a
-             -mfloat-abi=softfp)
-        IF(ANDROID_ARM_NEON)
-            LIST(APPEND ANDROID_COMPILER_FLAGS -mfpu=neon)
-        ELSE()
-            LIST(APPEND ANDROID_COMPILER_FLAGS -mfpu=vfpv3-d16)
-        ENDIF()
-        LIST(APPEND ANDROID_LINKER_FLAGS -Wl,--fix-cortex-a8)
-    ELSEIF(ANDROID_ABI STREQUAL "arm64-v8a")
-        LIST(APPEND ANDROID_COMPILER_FLAGS -march=armv8-a)
-    ENDIF()
-
-    IF(ANDROID_ABI MATCHES "^armeabi(-v7a)?$")
-        IF(ANDROID_ARM_MODE)
-            LIST(APPEND ANDROID_COMPILER_FLAGS -marm)
-        ELSE()
-            LIST(APPEND ANDROID_COMPILER_FLAGS -mthumb)
-        ENDIF()
-        IF(ANDROID_TOOLCHAIN STREQUAL clang)
-            # Disable integrated-as for better compatibility.
-            LIST(APPEND ANDROID_COMPILER_FLAGS -fno-integrated-as)
-        ENDIF()
-    ENDIF()
-
-    IF(ANDROID_TOOLCHAIN STREQUAL clang)
-        # CMake automatically forwards all compiler flags to the linker,
-        # and clang doesn't like having -Wa flags being used for linking.
-        # To prevent CMake from doing this would require meddling with
-        # the CMAKE_<LANG>_COMPILE_OBJECT rules, which would get quite messy.
-        LIST(APPEND ANDROID_LINKER_FLAGS -Qunused-arguments)
-    ENDIF()
-
-    STRING(REPLACE ";" " " ANDROID_COMPILER_FLAGS "${ANDROID_COMPILER_FLAGS}")
-    STRING(REPLACE ";" " " ANDROID_LINKER_FLAGS "${ANDROID_LINKER_FLAGS}")
-
-    SET(CMAKE_C_FLAGS "${ANDROID_COMPILER_FLAGS} ${CMAKE_C_FLAGS}"
-        CACHE STRING "C flags")
-    SET(CMAKE_CXX_FLAGS "${ANDROID_COMPILER_FLAGS} ${CMAKE_CXX_FLAGS}"
-        CACHE STRING "CXX flags")
-    SET(CMAKE_SHARED_LINKER_FLAGS "${ANDROID_LINKER_FLAGS} ${CMAKE_SHARED_LINKER_FLAGS}"
-        CACHE STRING "shared linker flags")
-
-    SET(CMAKE_POSITION_INDEPENDENT_CODE TRUE)
-    SET(CMAKE_EXE_LINKER_FLAGS "-pie -fPIE ${ANDROID_LINKER_FLAGS} ${CMAKE_EXE_LINKER_FLAGS}"
-        CACHE STRING "executable linker flags")
-
-    MESSAGE(STATUS "Android: Targeting API '${CMAKE_SYSTEM_VERSION}' "
-            "with architecture '${ANDROID_ARM_MODE_NAME}', "
-            "ABI '${ANDROID_ABI}', and processor '${CMAKE_SYSTEM_PROCESSOR}'")
-    MESSAGE(STATUS "System CMAKE_C_FLAGS: " ${CMAKE_C_FLAGS})
-    MESSAGE(STATUS "System CMAKE_CXX_FLAGS: " ${CMAKE_CXX_FLAGS})
-ELSE()
-    IF(ANDROID_STANDALONE_TOOLCHAIN)
-        SET(CMAKE_ANDROID_STANDALONE_TOOLCHAIN ${ANDROID_STANDALONE_TOOLCHAIN})
-    ENDIF()
-    SET(CMAKE_ANDROID_ARCH_ABI ${ANDROID_ABI})
-    IF(ANDROID_ABI MATCHES "^armeabi(-v7a)?$")
-        SET(CMAKE_ANDROID_ARM_MODE ${ANDROID_ARM_MODE})
-        IF(ANDROID_ABI STREQUAL "armeabi-v7a")
-            SET(CMAKE_ANDROID_ARM_NEON ${ANDROID_ARM_NEON})
-        ENDIF()
-    ENDIF()
-ENDIF()
diff --git a/cmake/cross_compiling/host.cmake b/cmake/cross_compiling/host.cmake
deleted file mode 100644
index f9c6b12136f488a9a6ab77b1ba673b6be75391b5..0000000000000000000000000000000000000000
--- a/cmake/cross_compiling/host.cmake
+++ /dev/null
@@ -1,49 +0,0 @@
-# Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserved.
-# 
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-# 
-# http://www.apache.org/licenses/LICENSE-2.0
-# 
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-# find host C compiler
-IF(HOST_C_COMPILER)
-    SET(HOST_C_COMPILER_NAME ${HOST_C_COMPILER})
-ELSEIF(NOT $ENV{CC} STREQUAL "")
-    SET(HOST_C_COMPILER_NAME $ENV{CC})
-ELSE()
-    SET(HOST_C_COMPILER_NAME cc)
-ENDIF()
-
-GET_FILENAME_COMPONENT(HOST_C_COMPILER_PATH ${HOST_C_COMPILER_NAME} PROGRAM)
-IF(NOT HOST_C_COMPILER_PATH OR NOT EXISTS ${HOST_C_COMPILER_PATH})
-    MESSAGE(FATAL_ERROR "Cannot find host C compiler, set host C compiler:\n"
-            "\tcmake .. -DHOST_C_COMPILER=...")
-ENDIF()
-
-# find host CXX compiler
-IF(HOST_CXX_COMPILER)
-    SET(HOST_CXX_COMPILER_NAME ${HOST_CXX_COMPILER})
-ELSEIF(NOT $ENV{CXX} STREQUAL "")
-    SET(HOST_CXX_COMPILER_NAME $ENV{CXX})
-ELSE()
-    SET(HOST_CXX_COMPILER_NAME c++)
-ENDIF()
-
-GET_FILENAME_COMPONENT(HOST_CXX_COMPILER_PATH ${HOST_CXX_COMPILER_NAME} PROGRAM)
-IF(NOT HOST_CXX_COMPILER_PATH OR NOT EXISTS ${HOST_CXX_COMPILER_PATH})
-    MESSAGE(FATAL_ERROR "Cannot find host CXX compiler, set host CXX compiler:\n"
-            "\tcmake .. -DHOST_CXX_COMPILER=...")
-ENDIF()
-
-SET(HOST_C_COMPILER ${HOST_C_COMPILER_PATH} CACHE PATH "Host C compiler")
-SET(HOST_CXX_COMPILER ${HOST_CXX_COMPILER_PATH} CACHE PATH "Host CXX compiler")
-
-MESSAGE(STATUS "Found host C compiler: " ${HOST_C_COMPILER})
-MESSAGE(STATUS "Found host CXX compiler: " ${HOST_CXX_COMPILER})
diff --git a/cmake/cross_compiling/ios.cmake b/cmake/cross_compiling/ios.cmake
deleted file mode 100644
index 10d389ec8ed57ac2b15dd925ef99c8aff4807b05..0000000000000000000000000000000000000000
--- a/cmake/cross_compiling/ios.cmake
+++ /dev/null
@@ -1,347 +0,0 @@
-# Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserved.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-# http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-# This is a toolchain file for cross-compiling for iOS, and the
-# configuration largely refers to public toolchain file:
-#    https://raw.githubusercontent.com/leetal/ios-cmake/master/ios.toolchain.cmake
-# and
-#    https://github.com/cristeab/ios-cmake
-#
-# Supports options:
-# IOS_PLATFORM = OS (default) or SIMULATOR
-#   This decides if SDKS will be selected from the iPhoneOS.platform or iPhoneSimulator.platform folders
-#   OS - the default, used to build for iPhone and iPad physical devices, which have an arm arch.
-#   SIMULATOR - used to build for the Simulator platforms, which have an x86 arch.
-# IOS_ARCH
-#   The archectures wanted to support, such "arm64", "armv7;arm64"
-# IOS_DEPLOYMENT_TARGET
-#   The minimum iOS deployment version, such as "7.0"
-# IOS_ENABLE_BITCODE = ON (default) or OFF
-# IOS_USE_VECLIB_FOR_BLAS = OFF (default) or ON
-# IOS_DEVELOPER_ROOT = automatic(default) or /path/to/platform/Developer folder
-#   By default this location is automatcially chosen based on the IOS_PLATFORM value above.
-#   If set manually, it will override the default location and force the user of a particular Developer Platform
-# IOS_SDK_ROOT = automatic(default) or /path/to/platform/Developer/SDKs/SDK folder
-#   By default this location is automatcially chosen based on the IOS_DEVELOPER_ROOT value.
-#   In this case it will always be the most up-to-date SDK found in the IOS_DEVELOPER_ROOT path.
-#   If set manually, this will force the use of a specific SDK version
-
-# Macros:
-# set_xcode_property (TARGET XCODE_PROPERTY XCODE_VALUE)
-#  A convenience macro for setting xcode specific properties on targets
-#  example: set_xcode_property (myioslib IPHONEOS_DEPLOYMENT_TARGET "3.1")
-# find_host_package (PROGRAM ARGS)
-#  A macro used to find executable programs on the host system, not within the iOS environment.
-#  Thanks to the android-cmake project for providing the command
-
-if(NOT IOS)
-  return()
-endif()
-
-set(CMAKE_SYSTEM_NAME Darwin)
-
-# Get the Xcode version being used.
-execute_process(COMMAND xcodebuild -version
-                OUTPUT_VARIABLE XCODE_VERSION
-                RESULT_VARIABLE XCODE_VERSION_RESULT
-                ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
-if(NOT ${XCODE_VERSION_RESULT})
-  string(REGEX MATCH "Xcode [0-9\\.]+" XCODE_VERSION "${XCODE_VERSION}")
-  string(REGEX REPLACE "Xcode ([0-9\\.]+)" "\\1" XCODE_VERSION "${XCODE_VERSION}")
-  message(STATUS "Building with Xcode version: ${XCODE_VERSION}")
-else()
-  message(FATAL_ERROR "Cannot execute xcodebuild, please check whether xcode is installed.")
-endif()
-
-# Required as of cmake 2.8.10
-set(CMAKE_OSX_DEPLOYMENT_TARGET "" CACHE STRING "Force unset of the deployment target for iOS" FORCE)
-
-# Setup iOS platform unless specified manually with IOS_PLATFORM
-if(NOT DEFINED IOS_PLATFORM)
-  set(IOS_PLATFORM "OS")
-endif()
-set(IOS_PLATFORM ${IOS_PLATFORM} CACHE STRING "Type of iOS Platform")
-
-# Set the architecture for iOS
-if(NOT DEFINED IOS_ARCH)
-  if(IOS_PLATFORM STREQUAL "OS")
-    set(IOS_ARCH "armv7;armv7s;arm64")
-  elseif(IOS_PLATFORM STREQUAL "SIMULATOR")
-    set(IOS_ARCH "i386;x86_64")
-  endif()
-endif()
-set(CMAKE_OSX_ARCHITECTURES ${IOS_ARCH} CACHE string  "Build architecture for iOS")
-
-# Specify minimum iOS deployment version
-if(NOT DEFINED IOS_DEPLOYMENT_TARGET)
-  set(IOS_DEPLOYMENT_TARGET "7.0")
-endif()
-set(IOS_DEPLOYMENT_TARGET ${IOS_DEPLOYMENT_TARGET} CACHE STRING "Minimum iOS version")
-
-# Whether to enable bitcode
-if(NOT DEFINED IOS_ENABLE_BITCODE)
-  set(IOS_ENABLE_BITCODE ON)
-endif()
-set(IOS_ENABLE_BITCODE ${IOS_ENABLE_BITCODE} CACHE BOOL "Whether to enable bitcode")
-
-if(NOT DEFINED IOS_USE_VECLIB_FOR_BLAS)
-  set(IOS_USE_VECLIB_FOR_BLAS OFF)
-endif()
-set(IOS_USE_VECLIB_FOR_BLAS ${IOS_UES_VECLIB_FOR_BLAS} CACHE BOOL "Whether to use veclib")
-
-# Check the platform selection and setup for developer root
-if(${IOS_PLATFORM} STREQUAL "OS")
-  set(IOS_PLATFORM_LOCATION "iPhoneOS.platform")
-  set(XCODE_IOS_PLATFORM iphoneos)
-
-  # This causes the installers to properly locate the output libraries
-  set(CMAKE_XCODE_EFFECTIVE_PLATFORMS "-iphoneos")
-elseif(${IOS_PLATFORM} STREQUAL "SIMULATOR")
-  set(IOS_PLATFORM_LOCATION "iPhoneSimulator.platform")
-  set(XCODE_IOS_PLATFORM iphonesimulator)
-
-  # This causes the installers to properly locate the output libraries
-  set(CMAKE_XCODE_EFFECTIVE_PLATFORMS "-iphonesimulator")
-elseif(${IOS_PLATFORM} STREQUAL "WATCHOS")
-  set(IOS_PLATFORM_LOCATION "WatchOS.platform")
-  set(XCODE_IOS_PLATFORM watchos)
-
-  # This causes the installers to properly locate the output libraries
-  set(CMAKE_XCODE_EFFECTIVE_PLATFORMS "-watchos")
-else(${IOS_PLATFORM} STREQUAL "OS")
-  message(FATAL_ERROR "Unsupported IOS_PLATFORM value selected. Please set to\n"
-          "\t OS, SIMULATOR, or WATCHOS.")
-endif()
-
-# Check iOS developer toolchain
-if(NOT DEFINED IOS_DEVELOPER_ROOT)
-  # Setup iOS developer location
-  execute_process(COMMAND xcode-select -print-path
-                  OUTPUT_VARIABLE XCODE_DEVELOPER_DIR
-                  RESULT_VARIABLE XCODE_DEVELOPER_DIR_RESULT
-                  ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
-  # Xcode 4.3 changed the installation location, choose the most recent one available
-  if(${XCODE_VERSION} VERSION_LESS "4.3.0")
-    set(IOS_DEVELOPER_ROOT "/Developer/Platforms/${IOS_PLATFORM_LOCATION}/Developer")
-  else()
-    set(IOS_DEVELOPER_ROOT "${XCODE_DEVELOPER_DIR}/Platforms/${IOS_PLATFORM_LOCATION}/Developer")
-  endif()
-endif()
-if(EXISTS ${IOS_DEVELOPER_ROOT})
-  set(IOS_DEVELOPER_ROOT ${IOS_DEVELOPER_ROOT} CACHE PATH "Location of iOS Platform")
-else()
-  message(FATAL_ERROR "Invalid IOS_DEVELOPER_ROOT: ${IOS_DEVELOPER_ROOT} does not exist.")
-endif()
-
-# Check iOS SDK
-if(NOT DEFINED IOS_SDK_ROOT)
-  # Find and use the most recent iOS sdk
-  file(GLOB IOS_SDK_LISTS "${IOS_DEVELOPER_ROOT}/SDKs/*")
-  if(IOS_SDK_LISTS)
-    list(SORT IOS_SDK_LISTS)
-    list(REVERSE IOS_SDK_LISTS)
-    list(GET IOS_SDK_LISTS 0 IOS_SDK_ROOT)
-  else(IOS_SDK_LISTS)
-    message(FATAL_ERROR "No iOS SDK's found in default search path ${IOS_DEVELOPER_ROOT}."
-            " Please manually set IOS_SDK_ROOT or install the iOS SDK.")
-  endif(IOS_SDK_LISTS)
-endif()
-if(EXISTS ${IOS_SDK_ROOT})
-  set(IOS_SDK_ROOT ${IOS_SDK_ROOT} CACHE PATH "Location of the selected iOS SDK")
-  message(STATUS "iOS toolchain: ${IOS_SDK_ROOT}")
-else()
-  message(FATAL_ERROR "Invalid IOS_SDK_ROOT: ${IOS_SDK_ROOT} does not exist.")
-endif()
-
-# Set the sysroot default to the most recent SDK
-set(CMAKE_OSX_SYSROOT ${IOS_SDK_ROOT} CACHE PATH "Sysroot used for iOS support")
-
-# Get version of iOS SDK
-execute_process(COMMAND xcodebuild -sdk ${CMAKE_OSX_SYSROOT} -version SDKVersion
-                OUTPUT_VARIABLE IOS_SDK_VERSION
-                RESULT_VARIABLE IOS_SDK_VERSION_RESULT
-                ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
-if(${IOS_SDK_VERSION_RESULT})
-  string(REGEX MATCH "(([0-9]+)\\.)+([0-9]+)" IOS_SDK_VERSION "${IOS_SDK_ROOT}")
-endif()
-if(NOT IOS_SDK_VERSION)
-  message(WARNING "Cannot get SDK's version.")
-  set(IOS_SDK_VERSION 1)
-endif()
-set(CMAKE_SYSTEM_VERSION ${IOS_SDK_VERSION})
-
-# Find the C & C++ compilers for the specified SDK.
-if(NOT CMAKE_C_COMPILER)
-  # Default to use clang
-  execute_process(COMMAND xcrun -sdk ${CMAKE_OSX_SYSROOT} -find clang
-                  OUTPUT_VARIABLE IOS_C_COMPILER
-                  RESULT_VARIABLE IOS_C_COMPILER_RESULT
-                  ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
-  if(${IOS_C_COMPILER_RESULT})
-    get_filename_component(IOS_C_COMPILER clang PROGRAM)
-  endif()
-else(NOT CMAKE_C_COMPILER)
-  # User can set it in cmake command
-  get_filename_component(IOS_C_COMPILER ${CMAKE_C_COMPILER} PROGRAM)
-endif(NOT CMAKE_C_COMPILER)
-if(NOT EXISTS ${IOS_C_COMPILER})
-  message(FATAL_ERROR "Cannot find C compiler: ${IOS_C_COMPILER}")
-endif()
-
-if(NOT CMAKE_CXX_COMPILER)
-  # Default to use clang++
-  execute_process(COMMAND xcrun -sdk ${CMAKE_OSX_SYSROOT} -find clang++
-                  OUTPUT_VARIABLE IOS_CXX_COMPILER
-                  RESULT_VARIABLE IOS_CXX_COMPILER_RESULT
-                  ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
-  if(${IOS_CXX_COMPILER_RESULT})
-    get_filename_component(IOS_CXX_COMPILER clang++ PROGRAM)
-  endif()
-else(NOT CMAKE_CXX_COMPILER)
-  # User can set it in cmake command
-  get_filename_component(IOS_CXX_COMPILER ${CMAKE_CXX_COMPILER} PROGRAM)
-endif(NOT CMAKE_CXX_COMPILER)
-if(NOT EXISTS ${IOS_CXX_COMPILER})
-  message(FATAL_ERROR "Cannot find CXX compiler: ${IOS_CXX_COMPILER}")
-endif()
-
-set(CMAKE_C_COMPILER ${IOS_C_COMPILER} CACHE PATH "C compiler" FORCE)
-set(CMAKE_CXX_COMPILER ${IOS_CXX_COMPILER} CACHE PATH "CXX compiler" FORCE)
-
-set(CMAKE_C_OSX_COMPATIBILITY_VERSION_FLAG "-compatibility_version ")
-set(CMAKE_C_OSX_CURRENT_VERSION_FLAG "-current_version ")
-set(CMAKE_CXX_OSX_COMPATIBILITY_VERSION_FLAG "${CMAKE_C_OSX_COMPATIBILITY_VERSION_FLAG}")
-set(CMAKE_CXX_OSX_CURRENT_VERSION_FLAG "${CMAKE_C_OSX_CURRENT_VERSION_FLAG}")
-
-# Set iOS specific C/C++ flags
-if(IOS_PLATFORM STREQUAL "OS")
-  if(XCODE_VERSION VERSION_LESS "7.0")
-    set(XCODE_IOS_PLATFORM_VERSION_FLAGS "-mios-version-min=${IOS_DEPLOYMENT_TARGET}")
-  else()
-    # Xcode 7.0+ uses flags we can build directly from XCODE_IOS_PLATFORM.
-    set(XCODE_IOS_PLATFORM_VERSION_FLAGS "-m${XCODE_IOS_PLATFORM}-version-min=${IOS_DEPLOYMENT_TARGET}")
-  endif()
-else()
-  set(XCODE_IOS_FLATFORM_VERSION_FLAGS "-mios-simulator-version-min=${IOS_DEPLOYMENT_TARGET}")
-endif()
-
-if(IOS_ENABLE_BITCODE)
-  set(XCODE_IOS_BITCODE_FLAGS "${IOS_COMPILER_FLAGS} -fembed-bitcode")
-else()
-  set(XCODE_IOS_BITCODE_FLAGS "")
-endif()
-
-set(IOS_COMPILER_FLAGS "${XCODE_IOS_PLATFORM_VERSION_FLAGS} ${XCODE_IOS_BITCODE_FLAGS}")
-
-# Hidden visibilty is required for cxx on iOS 
-set(CMAKE_C_FLAGS "${IOS_COMPILER_FLAGS} ${CMAKE_C_FLAGS}" CACHE STRING "C flags")
-set(CMAKE_CXX_FLAGS "${IOS_COMPILER_FLAGS} -fvisibility=hidden -fvisibility-inlines-hidden ${CMAKE_CXX_FLAGS}" CACHE STRING "CXX flags")
-
-set(IOS_LINK_FLAGS "${XCODE_IOS_PLATFORM_VERSION_FLAGS} -Wl,-search_paths_first")
-
-if(IOS_USE_VECLIB_FOR_BLAS)
-  # Find vecLib for iOS
-  set(VECLIB_SEARCH_DIRS
-      ${IOS_SDK_ROOT}/System/Library/Frameworks/Accelerate.framework/Versions/Current/Frameworks
-      ${IOS_SDK_ROOT}/System/Library/Frameworks/Accelerate.framework/Frameworks
-      )
-  find_path(VECLIB_INC_DIR vecLib.h PATHS ${VECLIB_SEARCH_DIRS}/vecLib.framework/Headers)
-
-  include(FindPackageHandleStandardArgs)
-  find_package_handle_standard_args(vecLib DEFAULT_MSG VECLIB_INC_DIR)
-
-  if(VECLIB_FOUND)
-    if(VECLIB_INC_DIR MATCHES "^/System/Library/Frameworks/vecLib.framework.*")
-      set(IOS_LINK_FLAGS ${IOS_LINK_FLAGS} -lcblas "-framework vecLib")
-      message(STATUS "Found standalone vecLib.framework")
-    else()
-      set(IOS_LINK_FLAGS ${IOS_LINK_FLAGS} -lcblas "-framework Accelerate")
-      message(STATUS "Found vecLib as part of Accelerate.framework")
-    endif()
-
-  endif()
-endif()
-
-set(CMAKE_C_LINK_FLAGS "${IOS_LINK_FLAGS} ${CMAKE_C_LINK_FLAGS}")
-set(CMAKE_CXX_LINK_FLAGS "${IOS_LINK_FLAGS} ${CMAKE_CXX_LINK_FLAGS}")
-
-set(CMAKE_PLATFORM_HAS_INSTALLNAME 1)
-if(NOT IOS_ENABLE_BITCODE)
-  set(CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS "-dynamiclib -headerpad_max_install_names")
-  set(CMAKE_SHARED_MODULE_CREATE_C_FLAGS "-bundle -headerpad_max_install_names")
-else()
-  set(CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS "-dynamiclib")
-  set(CMAKE_SHARED_MODULE_CREATE_C_FLAGS "-bundle")
-endif()
-set(CMAKE_SHARED_MODULE_LOADER_C_FLAG "-Wl,-bundle_loader,")
-set(CMAKE_SHARED_MODULE_LOADER_CXX_FLAG "-Wl,-bundle_loader,")
-set(CMAKE_FIND_LIBRARY_SUFFIXES ".dylib" ".so" ".a")
-
-# hack: if a new cmake (which uses CMAKE_INSTALL_NAME_TOOL) runs on an old build tree
-# (where install_name_tool was hardcoded) and where CMAKE_INSTALL_NAME_TOOL isn't in the cache
-# and still cmake didn't fail in CMakeFindBinUtils.cmake (because it isn't rerun)
-# hardcode CMAKE_INSTALL_NAME_TOOL here to install_name_tool, so it behaves as it did before, Alex
-if(NOT DEFINED CMAKE_INSTALL_NAME_TOOL)
-  find_program(CMAKE_INSTALL_NAME_TOOL install_name_tool)
-endif()
-
-# Set the find root to the iOS developer roots and to user defined paths
-set(CMAKE_FIND_ROOT_PATH ${IOS_DEVELOPER_ROOT} ${IOS_SDK_ROOT} ${CMAKE_PREFIX_PATH}
-    CACHE string  "iOS find search path root")
-
-# default to searching for frameworks first
-set(CMAKE_FIND_FRAMEWORK FIRST)
-
-# set up the default search directories for frameworks
-set(CMAKE_SYSTEM_FRAMEWORK_PATH
-    ${IOS_SDK_ROOT}/System/Library/Frameworks
-    ${IOS_SDK_ROOT}/System/Library/PrivateFrameworks
-    ${IOS_SDK_ROOT}/Developer/Library/Frameworks
-    )
-
-# only search the iOS sdks, not the remainder of the host filesystem
-set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
-set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
-
-message(STATUS "iOS: Targeting iOS '${CMAKE_SYSTEM_VERSION}', "
-        "building for '${IOS_PLATFORM}' platform, with architecture '${CMAKE_OSX_ARCHITECTURES}'")
-message(STATUS "System CMAKE_C_FLAGS: ${CMAKE_C_FLAGS}")
-message(STATUS "System CMAKE_CXX_FLAGS: ${CMAKE_CXX_FLAGS}")
-
-# Used in ExternalProject command
-string(REPLACE ";" "\\$<SEMICOLON>" EXTERNAL_IOS_ARCHITECTURES "${CMAKE_OSX_ARCHITECTURES}")
-set(EXTERNAL_OPTIONAL_ARGS
-    -DCMAKE_OSX_SYSROOT=${CMAKE_OSX_SYSROOT}
-    -DCMAKE_OSX_ARCHITECTURES=${EXTERNAL_IOS_ARCHITECTURES})
-
-# This little macro lets you set any XCode specific property
-macro(set_xcode_property TARGET XCODE_PROPERTY XCODE_VALUE)
-  set_property (TARGET ${TARGET} PROPERTY XCODE_ATTRIBUTE_${XCODE_PROPERTY} ${XCODE_VALUE})
-endmacro(set_xcode_property)
-
-# This macro lets you find executable programs on the host system
-macro(find_host_package)
-  set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
-  set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY NEVER)
-  set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE NEVER)
-  set(IOS FALSE)
-
-  find_package(${ARGN})
-
-  set(IOS TRUE)
-  set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM ONLY)
-  set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
-  set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
-endmacro(find_host_package)
diff --git a/cmake/cross_compiling/raspberry_pi.cmake b/cmake/cross_compiling/raspberry_pi.cmake
deleted file mode 100644
index 0425b2ae158b265fd6f8423b05190a8002f03f20..0000000000000000000000000000000000000000
--- a/cmake/cross_compiling/raspberry_pi.cmake
+++ /dev/null
@@ -1,84 +0,0 @@
-# Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserved.
-# 
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-# 
-# http://www.apache.org/licenses/LICENSE-2.0
-# 
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-# This is a toolchain file for cross-compiling for Raspberry Pi.
-# The supported variables are listed belows:
-#
-# RPI_TOOLCHAIN
-# RPI_ARM_NEON
-#
-# Also you can set CMAKE_C/CXX_COMPILER yourself, through cmake arguments.
-
-IF(NOT RPI)
-    return()
-ENDIF()
- 
-SET(CMAKE_SYSTEM_NAME Linux)
-SET(CMAKE_SYSTEM_VERSION 1)
-SET(CMAKE_SYSTEM_PROCESSOR arm)
-
-# check the exist of raspberry pi toolchain
-IF(NOT DEFINED RPI_TOOLCHAIN)
-    SET(RPI_TOOLCHAIN $ENV{RPI_TOOLCHAIN}
-        CACHE PATH "Folder holds the toolchain of Raspberr Pi")
-ENDIF()
-IF(NOT RPI_TOOLCHAIN)
-    MESSAGE(WARNING "It is recommended to set RPI_TOOLCHAIN to use toolchain.\n"
-            "To cross-compile for Raspberry Pi, you need to download the tools using:\n"
-            " git clone https://github.com/raspberrypi/tools\n")
-ENDIF()
-
-IF(NOT DEFINED RPI_ARM_NEON)
-    SET(RPI_ARM_NEON ON)
-ENDIF()
-
-IF(RPI_TOOLCHAIN)
-    SET(RPI_TOOLCHAIN_ROOT ${RPI_TOOLCHAIN})
-    IF(RPI_TOOLCHAIN_ROOT MATCHES "gcc-linaro-arm-linux-gnueabihf-raspbian(-x64)?$")
-        # gcc-linaro-arm-linux-gnueabihf-raspbian
-        # gcc-linaro-arm-linux-gnueabihf-raspbian-x64
-        SET(RPI_TOOLCHAIN_NAME arm-linux-gnueabihf)
-    ENDIF()
-    SET(RPI_TOOLCHAIN_PREFIX "${RPI_TOOLCHAIN_ROOT}/bin/${RPI_TOOLCHAIN_NAME}-")
-ENDIF()
-
-# C compiler
-IF(NOT CMAKE_C_COMPILER)
-    SET(RPI_C_COMPILER "${RPI_TOOLCHAIN_PREFIX}gcc")
-ELSE()
-    GET_FILENAME_COMPONENT(RPI_C_COMPILER ${CMAKE_C_COMPILER} PROGRAM)
-ENDIF()
-IF(NOT EXISTS ${RPI_C_COMPILER})
-    MESSAGE(FATAL_ERROR "Cannot find C compiler: ${RPI_C_COMPILER}")
-ENDIF()
-
-# CXX compiler
-IF(NOT CMAKE_CXX_COMPILER)
-    SET(RPI_CXX_COMPILER "${RPI_TOOLCHAIN_PREFIX}g++")
-ELSE()
-    GET_FILENAME_COMPONENT(RPI_CXX_COMPILER ${CMAKE_CXX_COMPILER} PROGRAM)
-ENDIF()
-IF(NOT EXISTS ${RPI_CXX_COMPILER})
-    MESSAGE(FATAL_ERROR "Cannot find CXX compiler: ${RPI_CXX_COMPILER}")
-ENDIF()
-
-SET(CMAKE_C_COMPILER ${RPI_C_COMPILER} CACHE PATH "C compiler" FORCE)
-SET(CMAKE_CXX_COMPILER ${RPI_CXX_COMPILER} CACHE PATH "CXX compiler" FORCE)
-
-IF(RPI_ARM_NEON)
-    SET(RPI_C_FLAGS "${RPI_C_FLAGS} -mfpu=neon")
-ENDIF()
-
-SET(CMAKE_C_FLAGS "${RPI_C_FLAGS} ${CMAKE_C_FLAGS}" CACHE STRING "C flags")
-SET(CMAKE_CXX_FLAGS "${RPI_C_FLAGS} ${CMAKE_CXX_FLAGS}" CACHE STRING "CXX flags")
diff --git a/cmake/cuda.cmake b/cmake/cuda.cmake
index 16432ce2b803f6d21bbf47200eda5404269b750f..ea46f6418edf1db70b2a308dd49cf2131cc89d3b 100644
--- a/cmake/cuda.cmake
+++ b/cmake/cuda.cmake
@@ -63,9 +63,7 @@ function(select_nvcc_arch_flags out_variable)
   # List of arch names
   set(archs_names "Kepler" "Maxwell" "Pascal" "Volta" "Turing" "All" "Manual")
   set(archs_name_default "All")
-  if(NOT CMAKE_CROSSCOMPILING)
-    list(APPEND archs_names "Auto")
-  endif()
+  list(APPEND archs_names "Auto")
 
   # set CUDA_ARCH_NAME strings (so it will be seen as dropbox in CMake-Gui)
   set(CUDA_ARCH_NAME ${archs_name_default} CACHE STRING "Select target NVIDIA GPU achitecture.")
diff --git a/cmake/external/openblas.cmake b/cmake/external/openblas.cmake
index 019745aad0d120f050338e0a0c996a67a7e14ac8..b347a592929836a473ac764c0af1153b07d54258 100644
--- a/cmake/external/openblas.cmake
+++ b/cmake/external/openblas.cmake
@@ -40,38 +40,12 @@ IF(NOT ${CBLAS_FOUND})
     SET(OPENBLAS_CC "${CMAKE_C_COMPILER} -Wno-unused-but-set-variable -Wno-unused-variable")
     SET(OPENBLAS_COMMIT "v0.2.20")
 
-    IF(CMAKE_CROSSCOMPILING)
-        SET(OPTIONAL_ARGS HOSTCC=${HOST_C_COMPILER})
-        GET_FILENAME_COMPONENT(CROSS_SUFFIX ${CMAKE_C_COMPILER} DIRECTORY)
-        SET(CROSS_SUFFIX ${CROSS_SUFFIX}/)
-        IF(ANDROID)
-            IF(ANDROID_ABI MATCHES "^armeabi(-v7a)?$")
-                # use softfp
-                SET(OPTIONAL_ARGS ${OPTIONAL_ARGS} TARGET=ARMV7 ARM_SOFTFP_ABI=1 USE_THREAD=0)
-            ELSEIF(ANDROID_ABI STREQUAL "arm64-v8a")
-                SET(OPTIONAL_ARGS ${OPTIONAL_ARGS} TARGET=ARMV8 BINARY=64 USE_THREAD=0)
-            ENDIF()
-        ELSEIF(IOS)
-            IF(CMAKE_OSX_ARCHITECTURES MATCHES "arm64")
-                SET(OPENBLAS_CC "${OPENBLAS_CC} ${CMAKE_C_FLAGS} -isysroot ${CMAKE_OSX_SYSROOT}")
-                SET(OPENBLAS_CC "${OPENBLAS_CC} -arch arm64")
-                SET(OPTIONAL_ARGS ${OPTIONAL_ARGS} TARGET=ARMV8 BINARY=64 USE_THREAD=0 CROSS_SUFFIX=${CROSS_SUFFIX})
-            ELSE()
-                MESSAGE(FATAL_ERROR "OpenBLAS only support arm64 architectures on iOS. "
-                       "You can set IOS_USE_VECLIB_FOR_BLAS=ON or USE_EIGEN_FOR_BLAS=ON to use other blas library instead.")
-            ENDIF()
-        ELSEIF(RPI)
-            # use hardfp
-            SET(OPTIONAL_ARGS ${OPTIONAL_ARGS} TARGET=ARMV7 USE_THREAD=0)
-        ENDIF()
-    ELSE()
-        IF(APPLE)
-            SET(OPENBLAS_CC "${CMAKE_C_COMPILER} -isysroot ${CMAKE_OSX_SYSROOT}")
-        ENDIF()
-        SET(OPTIONAL_ARGS "")
-        IF(CMAKE_SYSTEM_PROCESSOR MATCHES "^x86(_64)?$")
-            SET(OPTIONAL_ARGS DYNAMIC_ARCH=1 NUM_THREADS=64)
-        ENDIF()
+    IF(APPLE)
+        SET(OPENBLAS_CC "${CMAKE_C_COMPILER} -isysroot ${CMAKE_OSX_SYSROOT}")
+    ENDIF()
+    SET(OPTIONAL_ARGS "")
+    IF(CMAKE_SYSTEM_PROCESSOR MATCHES "^x86(_64)?$")
+        SET(OPTIONAL_ARGS DYNAMIC_ARCH=1 NUM_THREADS=64)
     ENDIF()
 
     SET(COMMON_ARGS CC=${OPENBLAS_CC} NO_SHARED=1 NO_LAPACK=1 libs)
diff --git a/cmake/external/protobuf.cmake b/cmake/external/protobuf.cmake
index d0f7f7409ba7b0ea99061e83733b4a961127d06c..e05b7694ddf1e1652b00f156cde1a2d433c9fc46 100644
--- a/cmake/external/protobuf.cmake
+++ b/cmake/external/protobuf.cmake
@@ -232,14 +232,6 @@ FUNCTION(build_protobuf TARGET_NAME BUILD_FOR_HOST)
 ENDFUNCTION()
 
 SET(PROTOBUF_VERSION 3.1)
-IF(CMAKE_CROSSCOMPILING)
-    build_protobuf(protobuf_host TRUE)
-    LIST(APPEND external_project_dependencies protobuf_host)
-
-    SET(PROTOBUF_PROTOC_EXECUTABLE ${protobuf_host_PROTOC_EXECUTABLE}
-        CACHE FILEPATH "protobuf executable." FORCE)
-ENDIF()
-
 
 IF(NOT PROTOBUF_FOUND)
     build_protobuf(extern_protobuf FALSE)
@@ -253,11 +245,7 @@ IF(NOT PROTOBUF_FOUND)
     SET(PROTOBUF_PROTOC_LIBRARY ${extern_protobuf_PROTOC_LIBRARY}
         CACHE FILEPATH "protoc library." FORCE)
 
-    IF(CMAKE_CROSSCOMPILING)
-        PROMPT_PROTOBUF_LIB(protobuf_host extern_protobuf)
-    ELSE()
-        SET(PROTOBUF_PROTOC_EXECUTABLE ${extern_protobuf_PROTOC_EXECUTABLE}
-            CACHE FILEPATH "protobuf executable." FORCE)
-        PROMPT_PROTOBUF_LIB(extern_protobuf)
-    ENDIF()
+    SET(PROTOBUF_PROTOC_EXECUTABLE ${extern_protobuf_PROTOC_EXECUTABLE}
+        CACHE FILEPATH "protobuf executable." FORCE)
+    PROMPT_PROTOBUF_LIB(extern_protobuf)
 ENDIF(NOT PROTOBUF_FOUND)
diff --git a/cmake/flags.cmake b/cmake/flags.cmake
index c4472040cef870454c072c1b84a04e1ac592b476..9e6c47f016fe6dfd809c5b2bc88ff59d0a6b2b84 100644
--- a/cmake/flags.cmake
+++ b/cmake/flags.cmake
@@ -156,10 +156,8 @@ set(GPU_COMMON_FLAGS
 endif(NOT WIN32)
 
 if (APPLE)
-    if(NOT CMAKE_CROSSCOMPILING)
-        # On Mac OS X build fat binaries with x86_64 architectures by default.
-        set (CMAKE_OSX_ARCHITECTURES "x86_64" CACHE STRING "Build architectures for OSX" FORCE)
-    endif()
+    # On Mac OS X build fat binaries with x86_64 architectures by default.
+    set (CMAKE_OSX_ARCHITECTURES "x86_64" CACHE STRING "Build architectures for OSX" FORCE)
     # On Mac OS X register class specifier is deprecated and will cause warning error on latest clang 10.0
     set (COMMON_FLAGS -Wno-deprecated-register)
 endif(APPLE)