编译调用出现错误

# warning: gethostbyname is obsolescent, use getnameinfo() instead.
# undefined reference to `getcontext'
# undefined reference to `setcontext'
# undefined reference to `makecontext'

解决方案

#cmake添加如下编译选择
ADD_DEFINITIONS (-DOPENSSL_NO_ASYNC)
ADD_DEFINITIONS (-DOPENSSL_NO_ASM)