//Compile syntax.c and syntax_weak with -nostartfiles -nodefaultlibs and then objdump the result.

//This is a common function
void normal_function(void);
void normal_function(void){
    asm volatile ("nop"::);
}

//This is a interrupt handler. What's the difference between this and the previous one ?
void __vector0(void) __attribute__ ((signal));
void __vector0(void){
    asm volatile ("nop"::);
}

//The naked attribute removes prologue and epilogue
void __vector1(void) __attribute__ ((signal)) __attribute__ ((naked));
void __vector1(void){
    asm volatile ("nop"::);
    asm volatile ("nop"::);
}

//The weak function can be redefined
void weak_function(void) __attribute__ ((weak));
void weak_function(void){
    asm volatile ("nop"::);
}


//use this if you want to put some assembly code in a specific section 
void vectors()  __attribute__ ((naked)) __attribute__ ((section(".vectors")));
void vectors(){
    asm volatile ("nop \n"
                  "nop \n"::);
}


//The main function - does the program ever gets here ?
int main(void){
   normal_function();
   return 0;
}