How to figure out which asm my server is using

What is the most straightforward way to determine which asm a server is using? For example, I have the following C program:

int main(void) {                                                                                                                                     int i = 4;    return i;}

And compiled to assembly via $ gcc -S main.c I get:

  1   .file "main.c"  2   .text  3   .globl  main  4   .type main, @function  5 main:  6 .LFB0:  7   .cfi_startproc  8   pushq %rbp  9   .cfi_def_cfa_offset 16 10   .cfi_offset 6, -16 11   movq  %rsp, %rbp 12   .cfi_def_cfa_register 6 13   movl  $4, -4(%rbp) 14   movl  -4(%rbp), %eax 15   popq  %rbp 16   .cfi_def_cfa 7, 8 17   ret 18   .cfi_endproc 19 .LFE0: 20   .size main, .-main 21   .ident  "GCC: (Ubuntu 4.8.4-2ubuntu1~14.04.1) 4.8.4" 22   .section  .note.GNU-stack,"",@progbits

I would like to use https://godbolt.org/ to select the closest language to compile online, but I'm not sure which one I should select (or even how to figure out how I can determine that). Basically all I know is "it looks like ATT syntax". How can I figure that out?