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自举相关bootstrappingIn computer science, bootstrapping is the process of writing a compiler (or assembler) in the source programming language that it intends to compile. Applying this technique leads to a

映射关系bss段：未初始化的全局变量和未初始化的局部静态变量,不占用程序文件的存储空间，程序启动后分配#include <stdio.h>int bss_data[1024 * 1024];int main(){ return 0;} gcc test.c -o bss du -sh bss 12K bssdata段：初始化的全局变量和初始化的局部静态变量，占用程序