GRPC编译过程

# 0.pre
人老了，也许35岁的程序员可以称之为老吧，总爱怀念过去。五年多前当时做机器人，懵懵懂懂，用过grpc，那时同事已经编译好deb安装包了，直接安装就好了；未了解种种之坑，等自己编译时才知道各种问题吧。今编译过程记录一下。
# 1.编译过程
## 1.1 grpc版本与protobuf版本
|软件|版本|comments|
|:--|:--|:--|
|grpc|1.27.1|未发现两者版本之间适配关系|
|protobuf|3.11.0|try n+ version，最后在这个版本适配|
## 1.2 grpc clone

```
sudo apt-get install build-essential autoconf libtool pkg-config libtool
git clone -b v1.27.1 https://gitee.com/tengheming/grpc.git
git submodule update --init #.gitmodules替换成国内源

```
### 1.2.1 absl
```
cd grpc/third_party/abseil
cmake ..
make
sudo make install
```
### 1.2.2 cares
```
cd third_party/abseil
cmake ..
make
sudo make install
```
### 1.2.3 protobuf(**cmake方式安装protobuf**)
```
##cmake 版本
cd third_party/protobuf/cmake
mkdir build
cd build
cmake ..
make
sudo make install
sudo ldconfig
sudo checkinstall #打包
```

### 1.2.4 zlib
```
cd third_party/zlib
./configure
make
sudo make install
```

### 1.2.5 grpc编译
```
cmake ../.. -DgRPC_INSTALL=ON                \
              -DCMAKE_BUILD_TYPE=Release       \
              -DgRPC_ABSL_PROVIDER=package     \
              -DgRPC_CARES_PROVIDER=package    \
              -DgRPC_PROTOBUF_PROVIDER=package \
              -DgRPC_RE2_PROVIDER=package      \
              -DgRPC_SSL_PROVIDER=package      \
              -DgRPC_ZLIB_PROVIDER=package

make
sudo make install
sudo checkinstall
```

# 2.常见的issues
## 2.1 ProtocolBuffersConfig.cmake/protocolbuffers-config.cmake
**原因:**
>Could not find module FindProtocolBuffers.cmake or a configuration file for package ProtocolBuffers.
  Adjust CMAKE_MODULE_PATH to find FindProtocolBuffers.cmake or set
  ProtocolBuffers_DIR to the directory containing a CMake configuration file
  for ProtocolBuffers.  The file will have one of the following names:
```
ProtocolBuffersConfig.cmake
protocolbuffers-config.cmake
```
**解决:**

```
protobuf的camke版本安装，protobuf源代码里有cmake文件夹，采用cmake方式安装
```
## 2.2 relocation R_X86_64_32 against `.text' can not be used when making a shared object; recompile with -fPIC

> absl CMakeLists.txt
```
add_compile_options(-fPIC)
```

信息安全从业人员^_^

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