文章目录

安装交叉编译工具aarch64-liinux-gun

安装bazel

编译tensorflow c++


进入官网www.linaro.org，根据对应系统的gcc版本下载对应的交叉编译工具(建议选择Binaries版本无需安装)

mysql 飞腾 麒麟 飞腾平台linux_linux


下载解压。bin目录为gcc的位置，建议添加到系统路径中，在命令行中输入

export PATH=/usr/local/share/gcc-linaro-5.4.1-2017.05-x86_64_aarch64-linux-gnu/bin:$PATH(注意该命令只针对当前窗口，关闭之后失效，如果想永久添加建议将其写入/etc/profile中 并执行source /etc/proflie 生效)进入bazel官网下载(作者版本为bazel0.15，可能需要jdk支持，注意bazel版本很重要，同时建议安装安装版后缀名为.sh),验证

mysql 飞腾 麒麟 飞腾平台linux_c++_02

下载tensorflow源码(作者编译的是tensorflow1.10)并解压，在编译时必须能够科学上网
进入tensorflow根目录中vim WORKSPACE
在底部填入，注意修改path

new_local_repository(
      name = "aarch64_compiler",
      path = "/usr/local/share/gcc-linaro-5.4.1-2017.01-x86_64_aarch64-linux-gnu/",
      build_file = "aarch64_compiler.BUILD",
)

进入根目录
新建aarch64_compiler.BUILD
填入注意所有的srcs的路径都要修改

package(default_visibility = ['//visibility:public'])

filegroup(
  name = 'gcc',
  srcs = [
    'usr/local/share/gcc-linaro-5.4.1-2017.01-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu-gcc',
  ],
)

filegroup(
  name = 'ar',
  srcs = [
    'usr/local/share/gcc-linaro-5.4.1-2017.01-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu-ar',
  ],
)

filegroup(
  name = 'ld',
  srcs = [
    'usr/local/share/gcc-linaro-5.4.1-2017.01-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu-ld',
  ],
)

filegroup(
  name = 'nm',
  srcs = [
    'usr/local/share/gcc-linaro-5.4.1-2017.01-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu-nm',
  ],
)

filegroup(
  name = 'objcopy',
  srcs = [
    'usr/local/share/gcc-linaro-5.4.1-2017.01-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu-objcopy',
  ],
)

filegroup(
  name = 'objdump',
  srcs = [
    'usr/local/share/gcc-linaro-5.4.1-2017.01-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu-objdump',
  ],
)

filegroup(
  name = 'strip',
  srcs = [
    'usr/local/share/gcc-linaro-5.4.1-2017.01-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu-strip',
  ],
)
filegroup(
  name = 'as',
  srcs = [
    'usr/local/share/gcc-linaro-5.4.1-2017.01-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu-as',
  ],
)

filegroup(
  name = 'compiler_pieces',
  srcs = glob([
    'usr/local/share/gcc-linaro-5.4.1-2017.01-x86_64_aarch64-linux-gnu/lib/gcc/aarch64-linux-gnu/5.4.1/**',

  ]),
)

filegroup(
  name = 'compiler_components',
  srcs = [
    ':gcc',
    ':ar',
    ':ld',
    ':nm',
    ':objcopy',
    ':objdump',
    ':strip',
    ':as',
  ],
)

在根目录下进入tools，新建目录aarch64_compiler，进入目录新建BUILD和CROSSTOOL文件内容分别为：
BUILD：

package(default_visibility = ["//visibility:public"])

cc_toolchain_suite(
  name = 'toolchain',
  toolchains = {
  'aarch64|compiler':':gcc-linux-aarch64',
  },
)

filegroup(
    name = "empty",
    srcs = [],
)

cc_toolchain(
  name = 'gcc-linux-aarch64',
  all_files = ':empty',
  compiler_files = ':empty',
  cpu = 'aarch64',
  dwp_files = ':empty',
  dynamic_runtime_libs = [':empty'],
  linker_files = ':empty',
  objcopy_files = 'empty',
  static_runtime_libs = [':empty'],
  strip_files = 'empty',
  supports_param_files = 1,
)
~

CROSSTOOL(注意修改路径，同时注意与GitHub(在参考文献中)上的区别，GitHub作者在cxx_builtin_include_directory少加了一个库路径，导致作者被坑了好久)

major_version: "local"
minor_version: ""
default_target_cpu: "aarch64"

default_toolchain {
  cpu: "aarch64"
  toolchain_identifier: "aarch64-linux-gnu"
}

toolchain {
  abi_version: "aarch64"
  abi_libc_version: "aarch64"
  builtin_sysroot: ""
  compiler: "compiler"
  host_system_name: "aarch64"
  needsPic: true
  supports_gold_linker: true
  supports_incremental_linker: false
  supports_fission: false
  supports_interface_shared_objects: false
  supports_normalizing_ar: false
  #supports_start_end_lib: true
  target_libc: "aarch64"
  target_cpu: "aarch64"
  target_system_name: "aarch64"
  toolchain_identifier: "aarch64-linux-gnu"

  cxx_flag: "-std=c++11"
  linker_flag: "-lstdc++"
  linker_flag: "-lm"
  #linker_flag: "-fuse-ld=gold"
  linker_flag: "-Wl,-no-as-needed"
  linker_flag: "-Wl,-z,relro,-z,now"
  linker_flag: "-pass-exit-codes"

  cxx_builtin_include_directory: "/usr/local/share/gcc-linaro-5.4.1-2017.01-x86_64_aarch64-linux-gnu/aarch64-linux-gnu/include/c++/5.4.1/"
  cxx_builtin_include_directory: "/usr/local/share/gcc-linaro-5.4.1-2017.01-x86_64_aarch64-linux-gnu/aarch64-linux-gnu/include/c++/5.4.1/backward"
  cxx_builtin_include_directory: "/usr/local/share/gcc-linaro-5.4.1-2017.01-x86_64_aarch64-linux-gnu/aarch64-linux-gnu/include/"
  cxx_builtin_include_directory: "/usr/local/share/gcc-linaro-5.4.1-2017.01-x86_64_aarch64-linux-gnu/lib/gcc/aarch64-linux-gnu/5.4.1/include"
  cxx_builtin_include_directory: "/usr/local/share/gcc-linaro-5.4.1-2017.01-x86_64_aarch64-linux-gnu/lib/gcc/aarch64-linux-gnu/5.4.1/include-fixed"
  cxx_builtin_include_directory: "/usr/local/share/gcc-linaro-5.4.1-2017.01-x86_64_aarch64-linux-gnu/aarch64-linux-gnu/libc/usr/include"

  objcopy_embed_flag: "-I"
  objcopy_embed_flag: "binary"

  unfiltered_cxx_flag: "-fno-canonical-system-headers"
  unfiltered_cxx_flag: "-Wno-builtin-macro-redefined"
  unfiltered_cxx_flag: "-D__DATE__=\"redacted\""
  unfiltered_cxx_flag: "-D__TIMESTAMP__=\"redacted\""
  unfiltered_cxx_flag: "-D__TIME__=\"redacted\""
  compiler_flag: "-U_FORTIFY_SOURCE"
  compiler_flag: "-fstack-protector"
  compiler_flag: "-Wall"
  compiler_flag: "-Wunused-but-set-parameter"
  compiler_flag: "-Wno-free-nonheap-object"
  compiler_flag: "-fno-omit-frame-pointer"

  compiler_flag: "-isystem"
  compiler_flag: "usr/local/share/gcc-linaro-5.4.1-2017.01-x86_64_aarch64-linux-gnu/aarch64-linux-gnu/libc/usr/include"

  tool_path { name: "ld" path: "/usr/local/share/gcc-linaro-5.4.1-2017.01-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu-ld" }
  tool_path { name: "cpp" path: "/usr/local/share/gcc-linaro-5.4.1-2017.01-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu-cpp" }
  tool_path { name: "dwp" path: "/usr/local/share/gcc-linaro-5.4.1-2017.01-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu-dwp" }
  tool_path { name: "gcov" path: "/usr/local/share/gcc-linaro-5.4.1-2017.01-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu-gcov" }
  tool_path { name: "nm" path: "/usr/local/share/gcc-linaro-5.4.1-2017.01-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu-nm" }
  tool_path { name: "objcopy" path: "/usr/local/share/gcc-linaro-5.4.1-2017.01-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu-objcopy" }
  tool_path { name: "objdump" path: "/usr/local/share/gcc-linaro-5.4.1-2017.01-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu-objdump" }
  tool_path { name: "strip" path: "/usr/local/share/gcc-linaro-5.4.1-2017.01-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu-strip" }
  tool_path { name: "gcc" path: "/usr/local/share/gcc-linaro-5.4.1-2017.01-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu-gcc" }
  tool_path { name: "ar" path: "/usr/local/share/gcc-linaro-5.4.1-2017.01-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu-ar" }

  compilation_mode_flags {
    mode: DBG
    # Enable debug symbols.
    compiler_flag: "-g"
  }
  compilation_mode_flags {
    mode: OPT

    # No debug symbols.
    # Maybe we should enable https://gcc.gnu.org/wiki/DebugFission for opt or
    # even generally? However, that can't happen here, as it requires special
    # handling in Bazel.
    compiler_flag: "-g0"

    # Conservative choice for -O
    # -O3 can increase binary size and even slow down the resulting binaries.
    # Profile first and / or use FDO if you need better performance than this.
    compiler_flag: "-O2"
    compiler_flag: "-D_FORTIFY_SOURCE=1"

    # Disable assertions
    compiler_flag: "-DNDEBUG"

    # Removal of unused code and data at link time (can this increase binary size in some cases?).
    compiler_flag: "-ffunction-sections"
    compiler_flag: "-fdata-sections"
    linker_flag: "-Wl,--gc-sections"
  }

          linking_mode_flags { mode: DYNAMIC }

    feature {
      name: 'coverage'
      provides: 'profile'
      flag_set {
        action: 'preprocess-assemble'
        action: 'c-compile'
        action: 'c++-compile'
        action: 'c++-header-parsing'
        action: 'c++-header-preprocessing'
        action: 'c++-module-compile'
        flag_group {
        flag: '-fprofile-arcs'
        flag: '-ftest-coverage'
        }
      }

      flag_set {
        action: 'c++-link-interface-dynamic-library'
        action: 'c++-link-dynamic-library'
        action: 'c++-link-executable'
        flag_group {
        flag: '-lgcov'
        }
      }
    }

}

在根目录下执行./configure，选择编译选项，作者为保险只修改了第一个选项python的路径，其他全部为NO
然后执行
bazel build -c opt //tensorflow:libtensorflow_cc.so --cpu=aarch64 --crosstool_top=//tools/aarch64_compiler:toolchain --host_crosstool_top=@bazel_tools//tools/cpp:toolchain --verbose_failures
大概3000次action后完成。
在tensorflow-1.10.0/bazel-bin/tensorflow中找到tensorflow_cc.so 和 tensorflow_framework.so动态库

在编译完成后进入目录
tensorflow-1.10.0/tensorflow/contrib/lite/download_dependencies.sh执行下载后续编译需要的依赖，其中主要需要eigen和protobuf等。在downloads找到对应的库文件。

测试在CMake文件中需要包含的动态库：tensorflow_cc.so， tensorflow_framework.so
库文件：eigen，abls，protobuf，bazel-gengiles，tensorflow等等
可以在编译出错后查看缺少的文件，然后将文件添加到库中

https://github.com/zhangcliff/tensorflow-c-mnist 下载项目后将动态库拷到lib中并修改CMakeList.txt文件，添加库。

问题一
编译开始会下载一些依赖包可能由于版本更新的问题无法下载
建议Google搜索，替换对应的下载地址(有些地址出现在tensorflow-1.10.0/tensorflow/workspace.bzl中可以替换,论科学上网的重要性)

问题二
在编译时出现找不到ld的情况