[Sdcc-user] Initializer element is not constant

[<zh...@cm...>]

What does "Initializer element is not constant" mean?
I got this error when compiling C51 program.

# make main.rel
sdcc -mmcs51 --stack-auto --use-stdout  --code-size 32768 --iram-size 512 --xram-size 65536 -I/usr/share/sdcc/include -Iincludes  -D_DEBUG -DSDCC --model-large -I/usr/share/sdcc/include -Iincludes  -c main.c -o main.rel
main.c:513: warning 112: function 'rand' implicit declaration
main.c:513: warning 84: 'auto' variable 'rand' may be used before initialization
main.c:103: error 2: Initializer element is not constant
make: *** [main.rel] Error 1


The code is:

unsigned int signaltime=0;

void timer0() interrupt 1 using 1 
{
    TH0=0x4c;
    TL0=0x23;
    bgtime++;
    signaltime++; // This line causes error
    freqtime++;
    querytime++;
    scantime++;
}

The most strange is, SDCC reports error even I comment out this line or the whole function.

Any ideas?