[ARM] problem in interrupt firing

[Ravindrakant Jha]

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#include <LPC214X.H>
#define RDR     0x01 //receiver data ready
#define THRE    0x20//enable transmit interrupt
#define RDA     0x04  //receive data available on U0IIR
extern unsigned char msg[50];
unsigned char ch;
unsigned int count,i;
void check(unsigned char);
void serial_receive(void) __attribute__ ((interrupt("IRQ")));
void sleep_mode()
{
    PCON = 0x01;
}
 
void serial_init(unsigned int baudrate)
{
  PINSEL0=0X00; 
  PINSEL0=0X05;
  
  VICIntSelect |=(1<<6);//selecting uart 0 interrupt
  VICIntEnable |=(1<<6);//enalbling uart 0 interrupt
  U0LCR=0X83; //latch open 
  U0DLL=(unsigned)((3000000)/(16*baudrate))%256; //baud rate set
  U0DLM=(unsigned)((3000000)/(16*baudrate))/256;
  U0LCR=0X03;   // latch close
  U0FCR=0X01;  // fifo control register
  U0IER=0X00000001;
 // VICVectAddr1 = (unsigned long int)serial_receive;
 // VICVectCntl1 = 0x20 | 6; //(alternatively (1<<5) can also be used in place of 0X20
 
     VICVectAddr1 = (unsigned)serial_receive; //Pointer Interrupt Function (ISR)
    VICVectCntl1 = 0x20 | 6;
   VICIntEnable |= (1<<6); //Enable Uart0 interrupt , 6th bit=1
}
void serial_receive(void)    //receive 
{
    do           
     {
        ch = U0RBR;
        check(ch);
     }
     while(!(U0LSR&RDR));
    VICVectAddr = 0x00;
}
void serial_transmit(char t)  //transmit 
{
   
      U0THR=t; // transmit holding register
      while(!(U0LSR&0X20)); 
   
}
void send_string(char *str)  //to send a string
{
  while(*str!='\0')
  serial_transmit(*str++);                             
}
void check(unsigned char c)
{
   count=0;
   i=0;
   if(c==0X0a || c==0X0d)
   count++;
   else
   {
     msg[i]=c;
     i++;
   }
}

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to constantly monitor what i am receiving through my gsm i have declared an receive interrupt using UART0 in LPC2148.but when i build the program in keil it shows an warning
" attribute "interrupt" ignored".
and if i declare interrupt with the qualifier it shows an error
" declaration is incompatible with "void serial_receive(void)__irq".
I am unable to find mistake in my code.