解决mac os上pip安装mysqlclient失败的问题:library not found for -lgsl(lssl)

解决mac os上pip安装mysqlclient失败的问题

系统概述：

1. mac os mojave 10.14.5
2. python 2.7 virtualenvwrapper
3. pip 2 virtualenvwrapper

第一次尝试：

here
    PyAPI_FUNC(PyObject *) PyInt_FromString(char*, char**, int);
                                                 ^
    1 warning generated.
    gcc -bundle -undefined dynamic_lookup -arch x86_64 -g build/temp.macosx-10.9-x86_64-2.7/MySQLdb/_mysql.o -L/usr/local/Cellar/[email protected]/5.7.25/lib -lmysqlclient -lgsl -lcrypto -o build/lib.macosx-10.9-x86_64-2.7/MySQLdb/_mysql.so
    ld: library not found for -lgsl
    clang: error: linker command failed with exit code 1 (use -v to see invocation)
    error: command 'gcc' failed with exit status 1

在google上做了多次搜索结果的尝试后无法解决。便区查看了mysqlclient的文档 https://pypi.org/project/mysqlclient/ 在文档中有提示：

Change

# on macOS, on or about line 112:
# Create options
libs="-L$pkglibdir"
libs="$libs -l "
to

# Create options
libs="-L$pkglibdir"
libs="$libs -lmysqlclient -lssl -lcrypto"

再次尝试pip install mysqlclient还是报错只不过这次报错不一样了，如下：

 /Library/Frameworks/Python.framework/Versions/2.7/include/python2.7/intobject.h:34:46: note: passing argument to parameter here
    PyAPI_FUNC(PyObject *) PyInt_FromString(char*, char**, int);
                                                 ^
    1 warning generated.
    gcc -bundle -undefined dynamic_lookup -arch x86_64 -g build/temp.macosx-10.9-x86_64-2.7/MySQLdb/_mysql.o -L/usr/local/Cellar/[email protected]/5.7.25/lib -lmysqlclient -lssl -lcrypto -o build/lib.macosx-10.9-x86_64-2.7/MySQLdb/_mysql.so
    ld: library not found for -lssl
    clang: error: linker command failed with exit code 1 (use -v to see invocation)
    error: command 'gcc' failed with exit status 1
    ----------------------------------------

再次搜索关键词
pip install mysqlclient mac
找到了这篇博文，pipenv install mysqlclient on MacOSX - Shan Dou - Medium参考博主的操作获得了正确的方法：

正确的方法

在这之前请确保你安装了mysql-connector-c，mysql-connector-c的安装可参考：mysqlclient · PyPI

brew info openssl

获取如下的结果：

If you need to have openssl first in your PATH run:
  echo 'export PATH="/usr/local/opt/openssl/bin:$PATH"' >> ~/.zshrc

For compilers to find openssl you may need to set:
  export LDFLAGS="-L/usr/local/opt/openssl/lib"
  export CPPFLAGS="-I/usr/local/opt/openssl/include"

For pkg-config to find openssl you may need to set:
  export PKG_CONFIG_PATH="/usr/local/opt/openssl/lib/pkgconfig"

然后执行如下操作：

echo 'export PATH="/usr/local/opt/openssl/bin:$PATH"' >> ~/.zshrc

# 当前虚拟环境的命令行中执行
export LDFLAGS="-L/usr/local/opt/openssl/lib"
export CPPFLAGS="-I/usr/local/opt/openssl/include"