iOS 平台下编译libwebsockets

该问题慢慢解决中记录下：
1:下载源码
https://github.com/warmcat/libwebsockets/tree/v4.2-stable
2:分别执行命令

mkdir build destdir

• cd build
• export 'SAI_CPACK=-G ZIP'
• SAI_CPACK='-G ZIP'
• cmake .. -DCMAKE_MAKE_PROGRAM=/usr/bin/make -DCMAKE_IOS_DEVELOPER_ROOT=/opt/Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer -DCMAKE_TOOLCHAIN_FILE=contrib/iOS.cmake -DIOS_PLATFORM=OS -DLWS_WITH_SSL=OFF
  3: 假如项目使用SSL 则 -DLWS_WITH_SSL=ON
  但是还需要指定OPENSSL的编译路径
  命令如下

  cmake .. -DCMAKE_MAKE_PROGRAM=/usr/bin/make -DCMAKE_IOS_DEVELOPER_ROOT=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer  -DCMAKE_TOOLCHAIN_FILE=contrib/iOS.cmake -DIOS_PLATFORM=OS -DLWS_WITH_SSL=ON   -DLWS_OPENSSL_INCLUDE_DIRS=/Users/fei/libwebstable/openssl/include/   -DLWS_OPENSSL_LIBRARIES=‘/Users/fei/libwebstable/openssl/lib/libssl.a ; /Users/fei/libwebstable/openssl/lib/libcrypto.a’

最后执行 make -j
⚠️：以上的命令，必须是英文然后DLWS_OPENSSL_LIBRARIES这个路径‘;’是英文前后没有空格