__attribute__((visibility(“default“)))
attribute((visibility(“default”)))//hidden决定变成动态库后，是否可被访问执行。#ifndef FBC_LIBRARY_LIBRARY_HPP_#define FBC_LIBRARY_LIBRARY_HPP_// reference: https://gcc.gnu.org/wiki/Visibility// https://developer.apple.com/library/content/documentation/Devel
