[avr-gcc-list] if test ignored?

[Rick Mann]

On an AVR ATmega128:

I have two source files. In Serial.c, I define a global:
char    sCommandReceived;

in the corresponding Serial.h file, I have:

extern char sCommandReceived;

sCommandReceived is set to 1 when enough bytes have been copied into  
a buffer from the serial port. In main.c, which includes Serial.h, I  
have:

        while (true)
        {
                if (sCommandReceived)
                {
                        parseCommand();
                }
        }

If I break on the if statement, gdb tells me that sCommandReceived is  
1. However, a breakpoint in parseCommand(), defined earlier in the  
file, never gets called. If I call parseCommand() directly from the  
USART receive interrupt handler, it gets called. (parseCommand() then  
clears sCommandReceived).

What am I missing?

TIA,
--
Rick