knock 
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int main(int argc, char *argv[]) {
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​
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​
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  return 0;
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}        
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    .file   "8ef490aa-cec1-4a15-9d3a-20276913b452_assembly.cpp"
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    .text
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    .section    .text.startup,"ax",@progbits
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    .p2align 4
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    .globl  main
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    .type   main, @function
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main:
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.LFB0:
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    .cfi_startproc
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    xorl    %eax, %eax
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    ret
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    .cfi_endproc
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.LFE0:
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    .size   main, .-main
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    .ident  "GCC: (Debian 10.2.1-6) 10.2.1 20210110"
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    .section    .note.GNU-stack,"",@progbits
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​