gcc的__attribute__((constructor))特性

#include<stdio.h>
extern int __argc;
extern char **__argv;
extern int _winver;
extern char **_environ; 	

static __attribute__((constructor)) void before_main(void) 
{
    printf("_environ[0]=%s\n", _environ[0]);
    printf("_environ[1]=%s\n", _environ[1]);
    printf("_winver=%d\n", _winver);
    printf("argc=%d, argv[0]=%s\n", __argc, __argv[0]);
    printf("%s:%d\n", __FUNCTION__, __LINE__);
}
static __attribute__((destructor)) void after_main(void) 
{ 
    printf("%s:%d\n", __FUNCTION__, __LINE__); 
}
  
int main(int argc, char **argv) {
    printf("%s:%d\n", __FUNCTION__, __LINE__);
    return 0;
}

这些extern 符号在windows下可用，linux下却不识别