Running functions before and after main() (doesn't work on gcc and g++)

Startup_Exit_NonGcc.h

#include<stdio.h>

void First();
void Last();

#pragma startup First
#pragma exit Last

void First()
{
	printf("B4 main\n");
}

void Last()
{
	printf("After main\n");
}

int main()
{
	printf("Inside main\n");
	return 0;
}