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+title = "兼容多版本Python的第三方库编译说明"
+date = "2020-11-09"
+tags = ["兼容多版本Python的第三方库编译说明"]
+archives = "2020-11"
+author = "Ricardo.Cui"
+summary = "兼容多版本Python的第三方库编译说明"
+img = "/zh/post/lijun/title/title.png" 
+times = "19:30"
++++
+
+
+### 概述
+
+本文描述了如何在CentOS系统上编译出支持多版本python环境的openGauss-third_party第三方库。
+
+**硬件规格：**  
+CPU:	Intel(R) Xeon(R) Gold 6266C CPU @ 3.00GHz 7核  
+内存:	32G
+
+**软件规格：**   
+操作系统:	CentOS Linux release 7.6.1810 (Core)  
+数据库: openGauss 1.0.1  
+Python版本：3.7.7
+
+---
+
+### 编译步骤
+
+若希望编译出的支持多版本安装的第三方库，只需在所需环境下单独编译CFFI模组，并将其放入openGauss-third_party_binartlibs//dependency/centos7.6_x86_64/install_tools目录下即可，下面为详细过程。
+
+**1.环境准备**
+
+首先确定所用系统为CentOS x86_64, 接着安装编译所需组件：  
+>openSSL  
+openSSL-devel  
+libaio-devel  
+ncurses-devel  
+pam-devel  
+libffi-devel  
+python3-devel  
+libtool
+
+建议采用yum install *** 方式安装。
+
+**2.编译安装Python3.X.X**  
+官网下载所需的Python3.X.X源代码并解压。进入解压出来的python目录用运行如下命令：  
+>`vi Modules/Setup.dist`  
+
+搜索SSL并且取消注释如下代码：  
+
+>`# Socket module helper for socket(2)`  
+`_socket socketmodule.c`  
+>
+>`# Socket module helper for SSL support; you must comment out the other`  
+`# socket line above, and possibly edit the SSL variable:`  
+`#SSL=/usr/local/ssl`  
+`_ssl _ssl.c `  
+`        -DUSE_SSL -I$(SSL)/include -I$(SSL)/include/openssl`  
+`        -L$(SSL)/lib -lssl -lcrypto`  
+
+如果SSL不是在默认路径，则需修改SSL路径为安装目录。  
+
+编译安装python到指定目录： 
+>`./configure --prefix=/usr/local/python3.x.x/ --enable-shared`  
+`make && make install`  
+
+安装成功后运行`python -V`命令查看python版本是否为所需版本，若不是请去/usr/bin目录修改python软链接使其指向正确的python安装目录。
+
+**3.编译第三方库**  
+从社区下载的第三方编译源码openGauss-third_party, 
+进入openGauss-third_party/dependency/build，打开build_dependency.sh脚本，注释掉不需要编译的第三方组件：  
+>...  
+`function build_pylib()`
+`{`
+`#    build_item six`  
+`#    build_item pycparser`  
+`    build_item cffi`  
+`#    build_item bcrypt`  
+`#    build_item idna`  
+`#    build_item ipaddress`  
+`#    build_item netifaces`  
+`#    build_item pynacl`  
+`#    build_item asn1crypto`  
+`#    build_item cryptography`  
+`#    build_item pyOpenSSL`  
+`#    build_item paramiko`  
+`#    build_item psutil`  
+`#    build_item pyasn1`  
+`    if [ -d $BUILD_SCRIPT_PATH/../install_comm ];then`  
+`        rm -rf $BUILD_SCRIPT_PATH/../install_comm`  
+`    fi`  
+`}`  
+...
+
+注释掉Main函数中的  
+>...  
+`#    build_first`  
+`#    build_second`   
+`    build_pylib`  
+...  
+
+再进入openGauss-third_party/build文件夹下，打开build_all.sh脚本,在最下方注释掉以下几行：
+>`#    build_item buildtools`  
+    `build_item dependency`  
+`#    build_item platform`  
+
+在build目录下运行脚本：  
+>`cd ..`  
+`sh build_all.sh`
+
+binarylibs会生成到openGauss-third_party同级目录下，名为binarylibs。如果部分组件构建失败，可以检查日志。
+将binarylibs拷贝至openGauss-third_party_binarylibs：
+>`\cp -r binarylibs/ openGauss-third_party_binarylibs/`  
+
+如果希望在binarylibs中支持多个python版本，则需在多个版本python中重复以上步骤，编译对应版本的cffi，并将编译出的文件，放入openGauss-third_party_binarylibs/dependency/centos7.6_x86_64/install_tools目录下
+
+```
+drwxr-xr-x 2 root root   4096 Nov  3 15:24 bcrypt  
+drwxr-xr-x 2 root root   4096 Nov  3 15:24 cffi  
+-rw-r--r-- 1 root root    289 Nov  3 15:24 _cffi_backend.py
+-rwxr-xr-x 1 root root 189816 Nov  3 15:24 _cffi_backend.so_UCS2_3.6
+-rwxr-xr-x 1 root root 189816 Nov  4 09:21 _cffi_backend.so_UCS2_3.7
+-rwxr-xr-x 1 root root 189816 Nov  3 15:24 _cffi_backend.so_UCS4_3.6
+-rwxr-xr-x 1 root root 189816 Nov  4 09:21 _cffi_backend.so_UCS4_3.7
+drwxr-xr-x 4 root root   4096 Nov  3 15:26 cryptography
+drwxr-xr-x 4 root root   4096 Nov  3 15:26 nacl
+drwxr-xr-x 2 root root   4096 Nov  3 15:25 netifaces
+drwxr-xr-x 2 root root   4096 Nov  3 15:26 psutil
+```
+
+
+
+
+
+
+
+
+