函数自动调用

//=========== Visual C++ version ===============

#include <stdio.h>  int foo1(){printf("%s\n", __FUNCTION__);return 0;}int foo2(){printf("%s\n", __FUNCTION__);return 0;}int foo3(){printf("%s\n", __FUNCTION__);return 1;}int foo4(){printf("%s\n", __FUNCTION__);return 1;} typedef int (FUNC)(void);  #pragma data_seg(".CRT$XIU")  static FUNC * before[] = { foo1, foo2 };  #pragma data_seg(".CRT$XPU")  static FUNC * after[] = { foo3, foo4 };  #pragma data_seg() int main( int argc, char ** argv ){    printf("%s\n", __FUNCTION__);    return 0;}

//============ GCC version =======

#include <stdio.h>   __attribute((constructor)) void before_main() {     printf("%s/n",__FUNCTION__); }  __attribute((destructor)) void after_main() {     printf("%s/n",__FUNCTION__); }  int main( int argc, char ** argv ) {     printf("%s/n",__FUNCTION__);     return 0; }