Why does GCC not assign the static variable when it is initialized to 0

I initialize a static variable to 0, but when I see the assembly code, I find that only memory is allocated to the variable. The value is not assigned
And when I initialize the static variable to other numbers, I can find that the memory is assigned a value.
I guess whether GCC thinks the memory should be initialized to 0 by OS before we use the memory.

The GCC option I use is "gcc -m32 -fno-stack-protector -c -o"

When I initialize the static variable to 0, the c code and the assembly code:

static int temp_front=0;

.local  temp_front.1909
.comm   temp_front.1909,4,4

When I initialize it to other numbers, the code is:

static int temp_front=1;

    .align 4
    .type   temp_front.1909, @object
    .size   temp_front.1909, 4
temp_front.1909:
    .long   1