Google Tensorflow 源码编译，一：Protobuf

这几天终于把tensorflow安装上了，中间遇到过不少的问题，这里记录下来。供大家想源码安装的参考。

安装环境：POWER8处理器，Docker容器Ubuntu14.04镜像。

Build Protobuf<v3.0.0-alpha-3> for IBM POWER8 CPU from Source Code

My computer\'s os is ubuntu 14.04 , and I want to install protobuf v3.0.0-alpha-3, but there is no deb package in the repository, so I need to build from source code.

Here are the steps that I succeed to install protobuf<v3.0.0-alpha-3> on my computer:

1. Get source code

1.1 Get protobuf code

　　git clone https://github.com/google/protobuf

　　git checkout v3.0.0-alpha-3

1.2 Get gtest code

　　The latest protobuf version uses gmock, but v3.0.0-alpha-3 uses gtest. Anyway ,the following code always works!

　　git clone https://github.com/franramirez688/gmock(../ is the root path of protobuf)

　　cp ./gmock/gtest ../

2. Modify the code to support POWER cpu

2.1 Add g++ MACRO

　　in protobuf/src/google/protobuf/stubs/platform_macros.h:

　　change #elif defined(_POWER) to #elif defined(_POWER) || defined(__powerpc64__) || defined(__PPC64__).

2.2 Include power cpu header file

　　in protobuf/src/google/protobuf/stubs/atomicops.h, add:

　　if defined(GOOGLE_PROTOBUF_ARCH_POWER)

　　#include <google/protobuf/stubs/atomicops_internals_power.h>

　　endif

2.3 Add power cpu header file

　　add atomicops_internals_power.h to google/protobuf/stubs folder:

　　you can copy it from the latest version < v3.0.0-beta-1>

3. Compile source code

　　$ ./autogen.sh

　　$ ./configure

　　$ make

　　$ make install

4. the binary file <protoc> is saved at protobuf/src/protoc.