Understanding the order of local variable(s) on the stack frame

Question

The C standard doesn't specify the layout of variables on the stack but I want to understand how local variables are arranged by the gcc compiler. A simple example is given below

void fun(int a, int b, int c, int d, char *pass) {

    int flag = 0x7a69;
    char buffer[10];
    strcpy(buffer, pass);               
}

int main(int argc, char **argv) {
    fun(1, 2, 3, 4, argv[1]);
}

No matter what the order of buffer & flag , the flag always comes before the buffer.

(gdb) p &buffer
$1 = (char (*)[10]) 0xffffcff2

(gdb) p &flag
$2 = (int *) 0xffffcfec

I compile the program as:

gcc -g -m32 test.c

I tried to reorder the declaration of buffer and flag in order to see their arrangement on the stack frame but the order was always the same.

1. By looking at the source code, can i guess the order of locals on stack-frame by the gcc?
2. On what criteria gcc order the locals and why?