GCC函数加壳

[[https://blog.csdn.net/jklinqing007/article/details/20289729?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522164786120316782246423922%2522%252C%2522scm%2522%253A%252220140713.130102334.pc%255Fall.%2522%257D&request_id=164786120316782246423922&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2~all~first_rank_ecpm_v1~rank_v31_ecpm-2-20289729.142^v2^pc_search_result_cache,143^v4^control&utm_term=-finstrument-functions&spm=1018.2226.3001.4187|-finstrument-functions范例]]