irq in c working but not in c++, strange address redirect

Hello everyone,

I'm trying to learn the interrupt handler and how to program it in c++ but some strange behavior happen.

I set the interrupt on the button press and i debug my application: it is a simple application:

int main(void)
{
        SystemInit();
        Buttoninit();

        while(1);

} // end main;

and my interrupt handlers are:

void EINT0_IRQHandler (void)
{

  LPC_SC->EXTINT &= (1 << 0);      */
}


void EINT1_IRQHandler (void)
{
        LPC_SC->EXTINT &= (1 << 1);
}

void EINT2_IRQHandler (void)
{

  LPC_SC->EXTINT &= (1 << 2);
}

when i insert my handlers in the main.cpp file, at the top of at the botton as well, the interrupt is couch but redirect to a B instruction to my startup_LPC17xx.s .

Default_Handler PROC

                EXPORT  WDT_IRQHandler            [WEAK]
                EXPORT  TIMER0_IRQHandler         [WEAK]
                EXPORT  TIMER1_IRQHandler         [WEAK]
                EXPORT  TIMER2_IRQHandler         [WEAK]
                EXPORT  TIMER3_IRQHandler         [WEAK]
                EXPORT  UART0_IRQHandler          [WEAK]
                EXPORT  UART1_IRQHandler          [WEAK]
                EXPORT  UART2_IRQHandler          [WEAK]
                EXPORT  UART3_IRQHandler          [WEAK]
                EXPORT  PWM1_IRQHandler           [WEAK]
                EXPORT  I2C0_IRQHandler           [WEAK]
                EXPORT  I2C1_IRQHandler           [WEAK]
                EXPORT  I2C2_IRQHandler           [WEAK]
                EXPORT  SPI_IRQHandler            [WEAK]
                EXPORT  SSP0_IRQHandler           [WEAK]
                EXPORT  SSP1_IRQHandler           [WEAK]
                EXPORT  PLL0_IRQHandler           [WEAK]
                EXPORT  RTC_IRQHandler            [WEAK]
                EXPORT  EINT0_IRQHandler          [WEAK]
                EXPORT  EINT1_IRQHandler          [WEAK]
                EXPORT  EINT2_IRQHandler          [WEAK]
                EXPORT  EINT3_IRQHandler          [WEAK]
                EXPORT  ADC_IRQHandler            [WEAK]
                EXPORT  BOD_IRQHandler            [WEAK]
                EXPORT  USB_IRQHandler            [WEAK]
                EXPORT  CAN_IRQHandler            [WEAK]
                EXPORT  DMA_IRQHandler            [WEAK]
                EXPORT  I2S_IRQHandler            [WEAK]
                EXPORT  ENET_IRQHandler           [WEAK]
                EXPORT  RIT_IRQHandler            [WEAK]
                EXPORT  MCPWM_IRQHandler          [WEAK]
                EXPORT  QEI_IRQHandler            [WEAK]
                EXPORT  PLL1_IRQHandler           [WEAK]
                                EXPORT  USBActivity_IRQHandler    [WEAK]
                                EXPORT  CANActivity_IRQHandler    [WEAK]

WDT_IRQHandler
TIMER0_IRQHandler
TIMER1_IRQHandler
TIMER2_IRQHandler
TIMER3_IRQHandler
UART0_IRQHandler
UART1_IRQHandler
UART2_IRQHandler
UART3_IRQHandler
PWM1_IRQHandler
I2C0_IRQHandler
I2C1_IRQHandler
I2C2_IRQHandler
SPI_IRQHandler
SSP0_IRQHandler
SSP1_IRQHandler
PLL0_IRQHandler
RTC_IRQHandler
EINT0_IRQHandler
EINT1_IRQHandler
EINT2_IRQHandler
EINT3_IRQHandler
ADC_IRQHandler
BOD_IRQHandler
USB_IRQHandler
CAN_IRQHandler
DMA_IRQHandler
I2S_IRQHandler
ENET_IRQHandler
RIT_IRQHandler
MCPWM_IRQHandler
QEI_IRQHandler
PLL1_IRQHandler
USBActivity_IRQHandler
CANActivity_IRQHandler

                B       .   ; ****on IRQ, the uc redirect here!!!!

                ENDP

If in debug mode, i check the address of the EINT0_IRQHandler by positioning the cursor on the text, it is correct and it is the actual adress of the irq handler.

But when i insert my functions handlers to another file, named irq.c, the interrupt point to the correct functions....

Whats the different between putting that functions to a single c file and to a cpp file? what i'm missing in my program?

Thank you so much